Dairy harvesting facility with milk line protection system and methods

Abstract

Apparatus and methods for a dairy harvesting facility including valves and valve assemblies that prevent contaminants from reaching a central milk collection system.

Claims

1. A dairy animal milking apparatus comprising: a milker unit having a plurality of teat cups, each teat cup for receiving a respective teat of the dairy animal; a teat wash conduit in fluid communication with at least one teat cup; a teat wash valve assembly in communication with the teat wash conduit, and movable between a teat wash position and a closed milking position; a box wash conduit in fluid communication with the milker unit; a box wash valve assembly in communication with the box wash conduit, and movable between a box wash position and a closed milking position; a clean-in-place conduit in fluid communication with the milker unit; a clean-in-place dispenser assembly in fluid communication with the milker unit and movable between a clean-in-place position and a closed milking position; a milk conduit in fluid communication with the milker unit; a good milk valve assembly in fluid communication with the milk conduit, and movable between an open position for passing good milk and a closed position; a calf milk valve assembly in fluid communication with the milker unit, and movable between an open position for passing calf milk and a closed position; a bad milk valve assembly in fluid communication with the milker unit, and movable between an open position for passing bad milk and a closed position; and a controller for opening and closing the teat wash valve assembly and the box wash valve assembly to control; teat washing, box washing, clean-in-place washing, and milking; and for opening and closing the good milk valve assembly, the calf milk valve assembly, and the bad milk valve assembly to control the flows of good milk, calf milk, and bad milk in response to a milk factor; and wherein each valve assembly comprises: three block-bleed-block valve assemblies.

2. The apparatus of claim 1, wherein the milk factor includes a milking time factor.

3. The apparatus of claim 1, wherein the milk factor includes a milk quality factor.

4. The apparatus of claim 1, wherein the milk factor includes a milking time factor and a milk quality factor.

5. The apparatus of claim 1, and further comprising: a milking timer to clock a milking time, and in communication with the controller to transmit milking time data that can be used to open and close the good milk valve assembly, the calf milk valve assembly, and the bad milk valve assembly.

6. The apparatus of claim 1, and further comprising: a milk quality sensor to obtain milk quality data on milk from the milker unit, and in communication with the controller to transmit milk quality data that can be used to open and close the good milk valve assembly, the calf milk valve assembly, and the bad milk valve assembly.

7. The apparatus of claim 1, and further comprising: a milking timer to clock milking time and in communication with the controller to transmit milk time data to the controller; a milk quality sensor to obtain milk quality data on milk from the milker unit, and in communication with the controller to send milk quality data to the controller; and the controller compares milk time data and milk quality data to open or close the good milk valve assembly, the calf milk valve assembly, and the bad milk valve assembly.

8. The apparatus of claim 1, wherein the teat cleaning valve assembly comprises: a first blocking seal; a second blocking seal spaced apart from the first blocking seal; and a bleed vent disposed between the first blocking seal and the second blocking seal.

9. The apparatus of claim 1, wherein the teat cleaning valve assembly comprises: a plurality of block-bleed-block valve assemblies, and each block-bleed-block valve assembly includes, a first blocking seal; a second blocking seal spaced apart from the first blocking seal; and a bleed vent disposed between the first blocking seal and the second blocking seal.

10. The apparatus of claim 1, and further comprising: a good milk receiver in fluid communication with the good milk valve assembly.

11. The apparatus of claim 1, and further comprising: a bad milk receiver in fluid communication with the bad milk valve assembly.

12. The apparatus of claim 1, and further comprising: a bad milk receiver in communication with the bad milk valve assembly and the box wash valve assembly.

13. The apparatus of claim 1, and further comprising: a bad milk receiver in fluid communication with a bad milk conduit and the box wash valve assembly; and a good milk receiver in fluid communication with a good milk conduit and the box wash conduit.

14. The apparatus of claim 1, and further comprising: a proximity sensor disposed to collect teat wash valve assembly data and in communication with the controller to transmit valve assembly data to the controller.

15. The apparatus of claim 1, and further comprising: a milk flow sensor in fluid communication with the milker unit and in communication with the controller to transmit milk flow data to the controller; and an air purge in fluid communication with the milk flow sensor to at least partially purge milk from the milk flow sensor.

16. The apparatus of claim 1, and further comprising: a milk quality sensor in fluid communication with the milker unit, wherein the milk quality sensor includes a milk collection chamber for receiving a milk sample for quality testing, and the milk collection chamber defines an inlet for receiving milk at a first flow rate and an outlet for discharging milk at a second flow rate that is less than the first flow rate.

17. The apparatus of claim 1, wherein the clean-in-place conduit is in fluid communication with the milker unit teat cups when the milker unit is in a storage position.

18. The apparatus of claim 1, and further comprising: a clean-in-place manifold in fluid communication with the clean-in-place conduit, and the clean-in-place manifold is in fluid communication with at least one milker unit teat cup when the milker unit is in a storage position.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a schematic view of a dairy milking parlor in which there is a robotic milker with a milking machine in accordance with the present invention;

(2) FIG. 2A is a perspective view of the milking apparatus of the present invention incorporated into a robotic milking machine;

(3) FIG. 2B is a partial perspective view of the milking apparatus of FIG. 2A from the opposite perspective;

(4) FIG. 3A is a schematic view of a dairy animal preparation and milking system in accordance with the present invention;

(5) FIG. 3B is a schematic view of a dairy animal preparation and milking system in accordance with the present invention;

(6) FIG. 3C is a schematic view of a dairy animal preparation and milking system in accordance with the present invention;

(7) FIG. 4A is a partial perspective view of a milker unit in accordance with the present invention;

(8) FIG. 4B is a partial perspective view of dairy animal preparation and milking system in accordance with the present invention.

(9) FIG. 4C is a partial perspective view of dairy animal preparation and milking system in accordance with the present invention.

(10) FIG. 5 is a partial cross sectional view of an inflation in accordance with the present invention;

(11) FIG. 6 is a partial front view of the milking apparatus with some fluid flow paths illustrated;

(12) FIG. 7 is a perspective view of a teat preparation valve assembly;

(13) FIG. 8 is an end view of the teat preparation valve assembly;

(14) FIG. 9A is a cross-sectional view of the teat preparation valve assembly in a milking position taken along line 9-9 in FIG. 8;

(15) FIG. 9B is a cross-sectional view of the teat preparation valve assembly in a cleaning position taken along line 9-9 in FIG. 8;

(16) FIG. 10 is an exploded perspective view of a valve for use in a valve assembly in accordance with the present invention;

(17) FIG. 11 is a perspective view of the valve of FIG. 10 in an assembled state;

(18) FIG. 12 is a side view of the valve of FIG. 11;

(19) FIG. 13A is a cross-sectional view of the valve of FIG. 10 in a closed position;

(20) FIG. 13B is a cross-sectional view of the valve of FIG. 10 in an open position;

(21) FIG. 14A is a perspective view of a bad milk valve assembly in accordance with the present invention;

(22) FIG. 14B is a cross-sectional view of three valves to form a bad milk valve assembly in a closed position in accordance with the present invention;

(23) FIG. 14C is a partial cross-sectional view of three valves to form a bad milk valve assembly in an open position in accordance with the present invention;

(24) FIG. 15A is a perspective view of a good milk valve assembly in accordance with the present invention;

(25) FIG. 15B is a cross-sectional view of three valves to form a good milk valve assembly in a closed position in accordance with the present invention;

(26) FIG. 15C is a partial cross-sectional view of three valves to form a good milk valve assembly in an open position in accordance with the present invention;

(27) FIG. 16 is a partial cross-sectional view of a calf milk valve assembly;

(28) FIG. 17 is a schematic view of a milk collection system and a clean-in-place dispenser assembly with representative flow lines in accordance with the present invention;

(29) FIG. 18 is a front view of a clean-in-place valve arrangement of FIG. 17;

(30) FIG. 19A, B, C are front view schematics of the clean-in-place valve assembly in accordance with the present invention;

(31) FIG. 20 is a cross-sectional view of a conductivity sensor for use with the present invention;

(32) FIG. 21A is a perspective view of a valve block in accordance with the present invention;

(33) FIG. 21B is a left side view of the valve block of FIG. 21A with solenoid valves removed;

(34) FIG. 21C is a side cross sectional left side view of the valve block of FIG. 21A with solenoid valves removed;

(35) FIG. 21D is a side cross sectional front view of the valve block of FIG. 21A with solenoid valves removed;

(36) FIG. 22A is a chart showing the effectiveness of an automated preparation system in accordance with the present invention; and

(37) FIG. 22B is a chart showing the effectiveness of an automated preparation system in accordance with the present invention.

DETAILED DESCRIPTION OF THE INVENTION

(38) To the extent reasonable and practical, the same identification numeral will be used to identify the same or similar feature in each of the figures.

(39) Illustrated generally in FIG. 1 is a dairy harvesting facility 20 having stalls 22, alleys 24, and milking stalls 26. Dairy animals 27 move through the dairy harvesting facility 20 to feed, rest, and be milked in the milking stalls 26. Control gates 29 can be used to sort cows or to prevent them from entering a particular area. Preferably, an animal identification system is used to identify cows for sorting and correlating to milk, illness, and other purposes.

(40) The milking stalls 26 can be of any shape or arrangement, and be stationary or rotatable. Animals can be allowed to enter the milking stalls at will or be controlled by gates 29 that are selective based on the animal's history of milking or health considerations. Animals can also be moved into the milking stalls 26 by an operator.

(41) In a preferred embodiment of the invention, the milking stall 26 is equipped with a robot 30 (FIGS. 2A and 2B) that attaches the preparation and milking system of the present invention to an animal. Nonetheless, the present invention could be used in any dairy harvesting facility 20 regardless of how the system is attached to dairy animals.

(42) In either case, a controller 40 is used to initiate the preparation process and fire each valve in an appropriate sequence. The controller 40 can also receive data from related sensors and monitors. Data can be stored, printed, displayed or otherwise utilized to improve and monitor preparation procedures.

(43) In a robotic application, once an animal is identified in the box as being an animal acceptable for milking, the robotic milking machine 30 travels to the box and removes the milking machine cluster 46 from its cleaning station. The milker unit cluster 46 is moved under the dairy animal with robotic support arms 38 that can include tubes for vacuum to operate as indicated below, teats are located and all teat cups 48 are attached to teats. Vacuum with pulsation is applied for a predetermined time when searching for a teat. If a teat is located, vacuum and pulsation remain on throughout prep process. If teat is not located, vacuum is shut off and teat location is attempted again.

(44) Illustrated in FIGS. 2A and 2B is the robotic milking machine 30 having a housing 32, a milking stall 34, a control gate 36, a robotic support arms 38, a controller 40, a milker unit 46, a key pad 50, a display screen 52, a preparation fluid receiver 54, a good milk receiver 56, a bad milk valve assembly 60, a good milk valve assembly 62, a box wash valve assembly 66, a calf milk valve assembly 70, a final milker machine valve assembly 72.

(45) The milker unit 46, milk collecting system, box washing system, and clean-in-place milk collecting and wash system can perform several synchronized functions, including: dairy animal teat preparation before milking; dairy animal milking; teat dip application, milk and cleaning fluid disposal; milk collection; milking apparatus cleaning; and dairy milk collection system cleaning. Not all of these functions are required to support one another, and various individual functions and combinations of functions are within the scope of the invention because they share similar safety features.

(46) Robotic Milking Machine Functions

(47) Generally, the robotic milker 30 operates without an attendant, so a dairy animal such as a cow, enters the milking stall 34 on its own, is automatically secured by the control gate 36, fitted with the milker unit 46 by the robotic arm 38, prepared for milking by cleaning fluids flowing through the teat preparation valve 68 that includes a valve set 70 for metering sanitizing solution and at least a portion of the milker unit 46, and then milked by the milker unit 46. A preferred robotic milking system is available from GEA Farm Technologies GmbH of Bnen, Germany under the brand name Mlone.

(48) The milker unit 46 is depicted in FIG. 4A-4C and includes teat cups 48, liners 49, a milk manifold 51A, and a milk tube 51 through which fluids flow downstream. As milk flows through the milker unit 46, flow rate, quantity, and quality can be determined by appropriate sensors such as a blood sensor 63, a somatic cell sensor 67, a kick-off sensor 69, a milk flow sensor 71, a milk meter 64 (See FIG. 3A) that transmit corresponding data to the controller 40. The data transmitted from the sensors can be used to determine a milk factor that can be used to control the operations described herein. The robotic arm 38 can serve any number of milking stalls, but only one milking stall 34 is illustrated and up to five stalls is preferred. The robotic arm can be controlled by suitable hydraulic or pneumatic forces.

(49) In a preferred embodiment, animal preparation and milking are both performed when the teats are in the milking machine teat cups 48. Accordingly, the present invention includes fail safe precautions to prevent cleaning fluids or contaminated milk from entering the dairy's main milk handling and storage system where it could contaminate a larger quantity of milk and/or require cleaning of the milk lines, milk chiller, storage containers, valves, and all other milk collecting system components. Strict sanitation requirements (3-A Sanitary Standards) are met by the present invention in a number of ways, including material and part selection, part construction, and the valve systems described below.

(50) Animal Preparation And Milking Operation

(51) Initially, when a dairy animal enters the milking stall 34, a sensor observes the positions of its teats, relays corresponding data to the controller 40, and the controller 40 directs the robotic arm 38 to remove the milker unit 46 from a milker unit docking station 80 (see FIG. 5) and position the milker unit teat cups 48 under the animal teats there vacuum in the milker unit 46 secures the teat cups 48 to the animal teats. Shortly thereafter, the controller 40 initiates a teat preparation phase by activating the teat preparation valve 68. Cleaning fluids, water, and air are then directed through the sanitizer valve assembly 73 to meter the fluids through conduits to nozzles in the teat cups or teat cup liners to wash and rinse the teats. (Nozzles are not illustrated, but see U.S. Publication 2009/0320760 A1 for an example of a suitable nozzle arrangement.)

(52) In the milking stalls 22, the robotic system 30 moves a milker unit 46 from a cleaning position (FIGS. 4A and 4C) and a milking position (FIG. 4B). As seen in FIG. 5, the milker unit 46 includes a number of teat cups 48 and liners 49 inserted within the teat cup 48. The liner 49, includes a dome 61 that defines an opening 65 through which dairy animal teats are inserted.

(53) Each liner 49 is joined to an upstream end of a milk tube 51 that is connected to the valve assemblies described below.

(54) Vacuum tubes are joined to the teat cup 48 to apply alternating vacuum and venting to a space between the teat cup 48 and the liner 49 and thereby apply a milking action to the dairy animal's 27 teats. Vacuum is also applied through the liner 49 and the liner 49 to secure the inflation to the animal and to draw milk through these components, the long milk tube, and the milk lines, referred to collectively herein as the dairy system or milk system, in some places below.

(55) Prior to a milking operation, a dairy animal's 27 teats must be cleaned to prevent dirt from entering the inflation and being drawn by vacuum into the rest of the dairy system. Traditionally, this was done by an operator, who manually wiped the teats with a towel and/or disinfectant. Automated systems have been used to clean the teats automatically with sanitizer, water, and air, for example.

(56) In a robotic system available from GEA Farm Technologies GmbH of Bnen, Germany, the automated preparation system uses the milker unit 46 liner 4 to provide a vessel in which the sanitizing fluids are applied and drained the present invention adds significant safeguards that prevent sanitizing fluids from entering the dairy's milk system. A schematic of some of the components of a preferred embodiment of the preparation system 80 are depicted in schematic FIGS. 3A-3C.

(57) In FIGS. 3B and 3C, each teat cup 48 has a liner 49. The milk tube 51 is illustrated with exaggerated length to show various connections to other components, described below. In practice, robotic systems will have milk tubes 51 of a variety of lengths, but the short milk tube could be a standard length.

(58) FIGS. 3B and 3C further illustrate components of a preparation system in accordance with the present invention. The preparation system includes at its upstream end, a sanitizer source 89 that can include chemical sanitizers, water, air, heat exchangers, pulsators, or other components that can clean animal teats. In the illustrated embodiment, there is a first source 93, a second source 95, and a third source 97. Preferably, generally these represent sources of chemical sanitizer, water, and air (sanitizer fluids), and other fluids can be used within the definition of sanitizer fluids.

(59) The sanitizer sources 93, 95, 97 are stored in tanks or are available from any appropriate piping system, air compressor, pump, or device that can feed these sanitizer fluids, preferably under pressure, to the inflation, as described below.

(60) The sanitizer source 93 is in communication with a conduit 103 and a valve 113, the water source 95 is in communication with a conduit 105 and a valve 115, and the air source 97 is in communication with a conduit 107 and a valve 117.

(61) The three conduits 103, 105, 107 communicate with a main sanitizer line 109. Although illustrated as separate conduits, the conduits 103, 105, 107, 109 could be replaced by or be a portion of a valve block, as described below, for example. The sanitizer line 109 includes a downstream source valve 121 and a vent 123 that can be opened or closed by a vent or drain valve 125.

(62) Downstream from the liner 49 and in communication with the liner 49 directly or via the milk tube 51 is a waste drain system 126 that includes a conduit 127, a first waste valve 129, a waste vent 131, and a second waste valve 133. The vent 131 can be a vent or a drain and is preferably in communication with atmospheric pressure. Preferably the vent 131 includes a vent valve 137 to prevent waste from draining out of the vent 131, but it may not be necessary in all cases to include the valve 137.

(63) Further downstream, is a milk system shut-off assembly 146 that includes an upstream milk valve 145, a vent 149, and a downstream milk valve 151. As above, the vent 151 can be any vent or drain in communication with atmospheric pressure. The milk system shut-off assembly 146 vent 149 preferably includes a milk vent valve 154, but this is not absolutely necessary.

(64) In the milking position, the sanitation source 89 is closed off from the liner 49 by source valves 113, 115, 117 being closed and downstream source valve 121 being closed. The sanitizer vent 123 is open to atmospheric pressure because sanitizer vent valve 125 is opened, as well. This combination of valve closings and vent openings provides a block-bleed-block function to prevent milking vacuum from drawing sanitizer fluids into the milking system.

(65) Also, when in the milking position, waste valves 129, 133 are closed and vent valve 131 is open. This provides a similar block-bleed-block function to prevent anything in the waste drain system 126 from entering or being drawn back into the milk system.

(66) Also when in the milking position, the milk shut-off assembly 146 has its first and second milk valves 151, 153 open and its milk vent and valve 149, 153 closed to prevent the milk system vacuum from drawing in atmospheric pressure.

(67) In the teat preparation positions (FIG. 4B), the sanitizer supply system has its valves 113, 115, 117 open and its downstream sanitizer valve 121 open. The sanitizer vent 123 is closed to prevent sanitizer fluids from flowing out of the vent 123.

(68) Similarly, the waste system 126 has its first and second waste valves 129, 133 open and its waste line vent 135 closed.

(69) To form a block-bleed-block arrangement for the milking system, the milk shut-off assembly 145 has its first and second milk valves 151, 153 closed and milk line vent 149 and vent valve 153 open to atmosphere to prevent milk system vacuum or sanitizer pressure from drawing fluids through the milk shut-off assembly 146.

(70) The following Chart A is a useful summary of valve and vent positions for milking and preparation processes.

(71) TABLE-US-00001 CHART A 93 95 97 125 149, 153 137, 131 Teat Potable Clean Vent/ 121 147 Vent/ 151 129 Vent/ 133 Sanitizer Water air drain Block Block Drain Block Block drain Block Step 1 Sanitize O C C C O C O C O C O Cow Rinse C O C C C O C O C O C O Prep Purge C O C O C O C O C O Step 4 Milk C C C O C O C O C O C CIP C C C C O C O C O O C O C CIP C C O C C C O C O Default nc nc nc no nc nc no nc no no nc O = open C = closed

(72) FIG. 5 illustrates a cross-sectional view of teat preparation taking place in an liner 49 having a teat cup 48 with a liner 49 inserted partially therein. The liner 49 includes an upper dome 61 that fits over the top of the teat cup 48 in a conventional manner. The liner dome 61 defines an orifice 161 through which sanitizer fluids flow on their way to a dairy animal teat 163.

(73) Preferably, the teat preparation valve 68 controls flow of sanitizers, air, and water. Generally, sanitizer is provided first, followed by air to force sanitizer through the delivery system, and then water is used to rinse the delivery system and the animal teat.

(74) Cleaning fluids as well as dirt and debris cleaned from the animal are flushed through the milker unit 46 through a milk tube 51, before the dairy animal can be milked. In one preferred embodiment, a small quantity of milk from the early stage of milking may need to be sacrificed to ensure that the cleaning fluids and dirt are safely out of the milker unit 46 before substantially unadulterated milk is collected.

(75) Generally, it is preferred that milk from the animal flows for a predetermined period of time following the sensing of an initial flow of milk from a corresponding teat by a conductivity sensor when a threshold level of milk/fluid initial flow sensor is noticed. Milk can then be directed by the bad milk valve assembly 60 to a drain or other bad milk receptacle. Alternatively or in addition, a milk quality sensor 63, 67, and 69, for example, (FIG. 3A) can be used to monitor milk flowing from the dairy animal or individual dairy animal teats and transmit milk quality data to the controller 40 for determining whether to control the bad milk valve assembly 60 and direct milk to the drain or to control the good milk valve assembly 62 and direct milk to the good milk receiver 56.

(76) Cleaning Individual Milk Stall Lines

(77) After the milking operation is complete, the process repeats itself on the next dairy animal, unless the milk or milk lines are in need of a scheduled cleaning or were contaminated by cleaning fluids or contaminated milk (including milk with mastitis). In such a case, individual stall milk lines are cleaned, which is sometimes referred to as box washing. Box washing is a term used to describe a washing of only the components of an individual milker unit 46 or a number of milking apparatus, as opposed to the dairy's larger milk collecting system 33.

(78) The box washing phase can be initiated when the controller 40 receives data from the sensors 63, 67, 69, and 71, for example (FIG. 3A) that box washing is necessary, in response to predetermined wash intervals programmed into the controller 40, in response to operator intervention or the most recently milked animal is designated as being unhealthy or undergoing medical treatment, for example.

(79) To initiate the box washing phase, the box wash valve assembly 66 is activated by the controller 40, and wash fluids are pumped from nozzles 82 in the docking station 80, into the teat cups 48, and then through the milker unit 46, and to the preparation fluid receiver 54. Cleaning fluids are circulated through the good milk receiver 56 and then discharged through a calf milk drain. Preferably, the milker unit 46 is positioned by the robotic arm 38 at the docking station 80 (FIG. 4C).

(80) As seen in FIG. 4C, the docking station 80 is mounted to the robot housing 32 and adjacent to the milking stall 34. The docking station 80 includes nozzles 82 that are inserted into the teat cups 48 so that cleaning can take place. The docking station 80 also includes a flexible flange 84 that mates with the top of a corresponding teat cup 48 to form a seal. Milk line vacuum secures the teat cups 48 to the flanges 84.

(81) Controller Functions

(82) The controller 40 preferably controls operation of the above-described components, as well as those described below in response to its programming, timers, and data received from various sensors, for example. The controller 40 is preferably programmable with at least initial process steps for teat preparation, milking, and washing, using predetermined sequences and timing for these operations. The controller 40 can be a central processing unit (CPU), printed circuit board or any other suitable device.

(83) The preparation and milking sequences can be set and maintained for all dairy animals to be milked or programmed to perform the steps in a unique fashion for specific cows. Individualized programming can be based on each animal's lactation cycle, milking characteristics, health or other unique characteristic. A dairy animal identification system can send data to the controller 40. The controller 40 can also use fuzzy logic to adjust teat preparation, milking, and washing based on any desired dairy or dairy animal feature and thereby continually adjust to whatever conditions are present.

(84) Further, the controller 40 includes an operator interface, such as the display screen 52 to display any relevant information, such as, historical data, dairy animal information, current process data, and so on. Audible alarms and/or speakers can also be used. The controller 40 can be programmed, activated, and deactivated by an operator for operation. Preferably, the controller 40 initiates automatically when a dairy animal enters the milking stall 34. The display screen 52 can also display various features of the milking operation, warnings or any other information relating to the robotic milking machine 30, the animal being milked, udder quarters being milked, animal health, and animal control gates. Displays can take on any appropriate format and may be unique to suit the needs of any particular dairy.

(85) The controller 40 also preferably receives data from sensors corresponding to a cow identification, gate position, animal position, system operability, animal health, valve positions, milk times, milk quantities, preparation time and sequence, wash chemical supply quantities, as well as any other desired feature. The controller 40 compares these data to predetermined criteria and can then continue without change, adjust a process, deactivate one process, initiate another, or make determinations about where to route milk from the dairy animal, for example.

(86) Fluid Flow Paths

(87) In the present invention, dairy animal teat preparation is performed automatically before milking begins. As stated above, the milker unit 46 is used for the preparation process and for milking Flow paths for cleansing fluids, contaminated milk, calf milk, and milk for human consumption are described below.

(88) As seen in FIG. 6, the teat cups 48 are at the upstream end of the milker unit 46. Downstream from the teat cups 48 are the milk tubes 51 and the manifold 51A. The milk tube 51 is in fluid communication with both the bad milk valve assembly 60 and the good milk valve assembly 62 so that good milk and bad milk can be handled appropriately.

(89) Further, for the teat preparation process, the milker unit 46 is in communication with the teat preparation valve 68. The teat preparation valve 68 is activated to deliver teat wash chemicals, solutions, and air (teat preparation fluids) upstream through a suitable teat preparation conduit through which the teat preparation fluids flow to an outlet that is either positioned on the teat cup or through the teat cup liner. The teat preparation fluids are preferably delivered near the top of each teat so that they flow downward with any dirt or debris into the liner 49, and milk tube 51 from where they are disposed of or retained, as described below.

(90) Next, the milking operation begins, but for hygiene reasons, it is not assumed that all of the teat preparation fluids are rinsed out of the milker unit 46. To ensure a sanitary milk flow path, some milk from the first portion of the milking cycle is used to rinse the milker unit 46 and through the bad milk valve assembly 60. The amount of milk used for this milk rinsing operation can be determined in a number of ways, including empirically. Milking for a predetermined period of time from the start of milking can be replaced or augmented with milk quality testing using milk quality sensors 63, 67. The milk quality sensors 63, 67 gathers data indicating whether the milk satisfies a predetermined quality standard. The data is transmitted to the controller 40, which directs the milk to an appropriate receptacle by opening or closing the bad milk valve assembly 60 and good milk valve assembly 62.

(91) When milking time and/or quality data meet predetermined standards as determined in the controller 40, then the controller 40 opens or closes appropriate valve assemblies to direct the milk to the good milk receiver 56. This directing of milk is performed by the controller 40 to open and close appropriate valve assemblies, as described in more detail below. Calf milk can be directed through a calf milk conduit and/or stored in an appropriate receptacle. This decision can be made by the controller 40 or by an operator.

(92) From the good milk receiver 56, milk passes through a conduit 90 (FIG. 6) to the dairy milk collecting system 33. Milk can be retained in the good milk receiver 56 until it is determined that it meets quality standards, such as cleaning downstream from the milking apparatus 42, are performed. This is particularly advantageous in robotic systems because milking can continue despite there being incompatible processes occurring elsewhere in the dairy.

(93) Valves

(94) The present invention includes a number of components in each milking apparatus to ensure that sanitary conditions are met. Some of the primary components include three subsystems: teat preparation valve 68, a bad milk valve assembly 60, a good milk valve assembly 62, and a box wash valve assembly 66. Preferably, each valve assembly is positioned in piping, tubing, or other type of conduit that is connected directly or indirectly with the milker unit 46 and satisfies 3-A Sanitary Standards.

(95) The valve assemblies of the present invention can have various configurations, but valve assemblies through which milk flows preferably have three valves in series and each valve moves between opened and closed positions (or sometimes referred to below as milking or washing apparatus). The position of each valve in a valve assembly at any given time is determined and controlled by the controller 40. Position sensors 116 verify that a valve is in its desired position so that valve malfunctions and/or normal wear do not cause milk or cleaning fluids to be misdirected. The valve assemblies for milk handling can be used for all of the milk from an animal, from individual quarters or pairs of quarters. The robotic milker illustrated in FIGS. 2A and 2B have valve arrangements for individual quarters. Thus, for a single animal, there will be four assemblies of three valves each, for a total of twelve valves. Valve assemblies for teat preparation fluids and washing systems do not necessarily require the three valve assembly and are also described in detail below.

(96) Teat Preparation Valve

(97) As illustrated in FIGS. 7 to 9B, the teat preparation valve 68 incorporates a block-bleed-block arrangement to ensure safety from valve failure. The teat preparation valve 68 is mounted using a bracket 99, and preferably is contained within a housing 100. As seen in FIGS. 9A and 9B, the housing 100 has a bore 102, a spool 104 disposed for axial movement in the bore 102, a fluid inlet 108, an air inlet 110, a bleed vent 112, an outlet 114, and a proximity switch 116. FIG. 9A illustrates the teat preparation valve 68 in a closed position and FIG. 9B illustrates the teat preparation valve 68 in an open position.

(98) Generally, when in the open position (FIG. 9B) preparation fluid, such as water and/or cleaning fluids, are pumped through the fluid inlet 108 and out of the outlet 114, during a cleaning operation. If desired, an air slug or purge can then be pumped through the air inlet 108 and out through the outlet 114 to push cleaning fluids to their destination.

(99) The housing 100 preferably includes a body 120 formed or machined in a single piece or multiple pieces disposed between two ends 122, and these parts are secured with appropriate connectors, such as hex bolts 124 and nuts 119. Appropriate seals 130, such as o-ring seals, are disposed between the body 120 and each end 122. The housing 100 is preferably shaped and constructed as illustrated, but other shapes and arrangements are possible. Nonetheless, the illustrated embodiment is sized to fit into the robotic milking machine 30.

(100) Whether the inlets 108, 110, vent 112 or outlet 114 are opened (FIG. 9B, cleaning operation) or closed (FIG. 9A, milking operation) depends on the position of the spool 104 within the bore 102 because the spool 104 includes lands and recesses that are spaced apart and positioned in their desired locations as the spool 104 moves. As depicted in FIG. 9A, the inlets 108 and 110 are closed by lands 132 and 134, respectively. Each land 132, 134 is separated from the other by a pair of spaced apart seals 136 with a vent opening 138 disposed in between the seals 136 to form a block-bleed-block arrangement. The seals 136 are preferably u-cup seals, but other types of seals can be used.

(101) In the milking position, a slot 140 is positioned adjacent to the bleed vent 112, which itself has a pair of seals 144 disposed on each side to form the block-bleed-block arrangement. In FIG. 9A, the outlet 114 is blocked by a land 132. The slot 140 is sized to provide a desired sequence and timing of operation as the spool 104 moves back and forth. Other arrangements could be used to meet these operation criteria.

(102) The spool 104 is biased toward the closed or milking position as depicted in FIG. 9A by a spring 150. To close the teat preparation valve 68, pressurized air is allowed into the bore 102 to urge the switch 116 to move the spool 104 against the bias of the spring 150 (to the left, as viewed) to allow preparation fluid to flow through the fluid inlet 108, the vent opening 138, and a central bore 162 in the spool 104. When in the open or cleaning position (FIG. 9B), the slot 140 is aligned with the outlet 114. Minor calibration adjustments of the spool 104 are made possible by an adjustment screw 166 that sets the limit of spool movement that can be caused by the spring 150.

(103) Single Seat Valves

(104) A valve arrangement of the present invention is used along milk flow paths and preferably includes an assembly of three single seat valves. These assemblies are used in the bad milk valve assembly 60, the good milk valve assembly 62, and the box wash valve assembly 66, for example, but they are also used in other locations described below.

(105) As illustrated in FIGS. 10 to 13B, single-seat valve 198 is preferably the same size and construction as the others to reduce manufacturing and maintenance costs. Referring to the exploded view of FIG. 10, the valve 198 includes from left to right: a cylinder 200, an air fitting 206, a vent fitting 208, a spring 212, a first e-ring 216, a lower guide 244, a first u-cup seal 228, a second e-ring 236, a second seal 238, an upper guide 260, a third seal 254, a molded lip seal 234, a third o-ring seal 262, a plunger 264 with a head 265, a clamp 266, a fourth seal 268, and a body 270. The body includes three openings arranged in a T-shape. The openings are labeled 272, 280, and 284 in FIG. 10 and they may be inlets, outlets or permanently blocked in any given valve assembly, examples of which are described below.

(106) The single seat valve 198 is assembled by inserting the plunger 264 through the various internal parts and securing them together with the first and second e-rings 216 and 236 to recesses 271 and 273 in the plunger 264. The cylinder 200 is secured to the body 270 by the clamp 266. Other arrangements and connections for the internal and external parts of the single seat valve 198 are within the scope of the present invention.

(107) In FIGS. 12, 13A and 13B, the valve 198 is shown with the cylinder 200 secured to the body 270 with the clamp 266. Generally, each opening 272, 280, and 284 can be an inlet or an outlet. A pass through bore 286 can be opened at only one end or at both ends, depending upon its position in the valve assembly. The valves 198 can be joined at appropriate flanges 287. To open or close the valve 198, the plunger 264 is moved in a longitudinal axial direction so that the plunger head 265 engages a seat 285 in the body 270 or the plunger head 265 is spaced apart from the body seat 285.

(108) The plunger 264 is kept in alignment by the upper guide 260 and the lower guide 244. The spring 212 acts on the lower guide 244, to bias the plunger 264 toward the closed position, as seen in FIG. 12. The upper guide 260 is mated into an extension 287. The extension 287 defines a number of openings 288.

(109) When the valve 198 is opened, the plunger 264 is moved against the bias of the spring 212 with air pressure exerted through the air fitting 208 onto the lower guide 244. As a result, the plunger head 265 is moved out of engagement with the seat 284, and fluid can flow in or out of opening 272. When the valve 198 is closed, the plunger head 265 is engaged with the valve seat 284, so that fluid cannot flow out of the opening 272, but can flow past the plunger 264 in the pass through bore 286.

(110) The valves 198 are used in sets of three and preferably are arranged to provide a block-bleed-block function at each valve assembly as seen in FIGS. 13A-C, for example. In this embodiment, the outlet 284 in valve 198A is permanently blocked by a wall 297, and the opening 280 in valve 198C is permanently blocked by a wall 297. In a three valve assembly, the two outer valves 198A and 198C are open (FIG. 13A) and the valve 198B is closed to provide a pass through between valves 198A and 198C. In FIG. 13B, the valve 198B in the middle is open to provide a vent or bleed through the outlet 272 of the middle valve 198B, and the valves 198A and 198C are closed to provide blocks on opposite sides of the bleed created by valve 198B. Thus, the three valves subassemblies 198A-C cooperate to form a block-bleed-block safety feature. Alternately, the three valves 198A-C can be disposed in a single housing, but as depicted, they provide a relatively inexpensive option.

(111) Proximity sensor 294 is preferably used to indicate to the controller 40 that the plungers 264 are in the desired position. (See FIGS. 13A and 13B.)

(112) The chart below illustrates each valve 198A-C position related to the valve assembly position as a whole.

(113) TABLE-US-00002 Valve Assembly Position Valve 198A Valve 198B Valve 198C Closed Closed to Open to Open Vent Closed to Block Nipple Block Nipple Open Open Closed to Block Open Nipple Vent

(114) The example of valve assembly operation illustrated in FIGS. 13A and 13B includes flow lines A and B representing the direction fluid flows. More particularly, examples of operation for assemblies of valves 198 include the bad milk assembly 60 and the good milk assembly 62.

(115) Referring to FIG. 6, milk from the milker unit 46 flows through the milk tube 51 to a branch 53 that permits milk flow in two directions, but depending on whether the bad milk valve assembly 60 and the good milk valve assembly 62 are opened or closed the milk will flow in only one direction. Only one of these valve assemblies will be open during milking, and the other will be closed.

(116) If the controller 40 determines that the fluid flowing is teat preparation fluids or contaminated rinse milk, the good milk valve assembly 62 will be closed and the bad milk valve assembly 60 will be open.

(117) Bad Milk Valve Assembly

(118) In the bad milk assembly 60 illustrated in FIGS. 14A-14C, fluid enters the inlet on valve 198A through the opening 272 and out through the pass through bore 286, which is joined to the pass through on valve 198B. Fluid flows through the valve 198B bore 286, into the valve 198C bore 286, and out of the opening 272. The valves 198A-C are illustrated as being joined directly to one another, but suitable conduits can be used in between them.

(119) From the valve 198C opening 272, the fluids flow through bore 286, and into the wash fluid receiver 54. From there, the wash fluids and/or contaminated milk can be directed to a drain 296 or other suitable disposal apparatus.

(120) If the controller 40 determines that the milk flowing through the milk tube 51 is good (meets predetermined quality standards), the bad milk valve assembly 60 will be closed and the good milk valve assembly 62 will be opened.

(121) In the closed position, bad milk valve assembly 60 has valve 198A in a closed (block) position, valve 198B in a vent position, and valve 198C in a closed (block) position to provide the block-bleed-block arrangement described above.

(122) Good Milk Valve Assembly

(123) Referring to FIGS. 15A-15C, the good milk valve assembly 62 is in an open position when its: valve 198A is open; valve 198B is sealed from atmosphere; and valve 198C is open. In the good milk valve assembly 62 closed positions, valve 198A is closed, valve 198B is in a vent position, and valve 198C is closed, for block-bleed-block.

(124) When the good milk valve assembly 62 is in the open position, good milk flows into the opening 272 of valve 198A, out of the valve 198A pass through bore 286, through the bore 286 of valve 198B, and through the bore 286 and opening 272 of valve 198C. From there, the good milk flows through a good milk conduit 300 and into the good milk receiver 56 via its inlet 308.

(125) Good Milk Flow Path

(126) Good milk can remain in the good milk receiver 56 for a period of time for quality testing or to serve as a buffer tank when the dairy milk collecting system 33 is off-line, as described above. When desired, good milk flows from the good milk receptacle outlet 314, through the conduit 316, and through a pass through conduit 320 in the box wash valve assembly 66, which is explained in more detail below.

(127) From the box wash valve assembly 66, the good milk flows to a conduit junction 330 where it flows to the dairy milk collecting system conduit 332 or to a bad milk conduit 334, depending upon which of the good milk valve assembly 62 or the bad milk valve assembly 60 is open. When one of these valve assemblies is open, the other valve assembly will be closed.

(128) From the good milk line 300, the milk can go either to the dairy milk collecting system or to a calf milk line 340. Suitable block-bleed-block valve assemblies, like those described above and illustrated in FIG. 16, are preferably used to segregate good milk and calf milk.

(129) FIG. 16 illustrates a valve assembly for a calf milk flow path. A kick-off sensor senses the existence or absence of vacuum and will signal the controller to initiate an appropriate action.

(130) Dairy Milk Collecting System

(131) The schematic view of a milk collection system 33 as depicted in FIG. 17, illustrates additional general components of a dairy milk collecting system 33, which is downstream from the good milk receiver 56 and received via conduit 399. As seen in FIGS. 17-18, the milk collecting system 33 includes a milk pump 400, a milk pre-cooler 402, a cooling tank valve assembly 410, a clean-in-place spray ball 412 (or other suitable water inlet deflector), a clean-in-place line 414 with a valve assembly 413 returning to the robotic milking machine 30, a cooling tank 430, and a second valve assembly 415 and appropriate conduits and drains.

(132) The cooling tank valve assembly 410 (FIGS. 19A-19C) preferably includes five valves 420, 422, 424, 426, and 428. The following chart indicates valve assembly positions in the milking position, clean-in-place position, and cooling tank wash position that allows the good milk receiver 56 to act as a buffer tank while the cooling tank 430 is being washed, so milking operations can continue during cooling tank 430 washing.

(133) TABLE-US-00003 Valve Milk Position CIP Position Cooling Tank Wash 420 Open Open Closed 422 Open Closed Open 424 Closed Open Open 426 Closed Closed Open 428 Closed Open Closed

(134) Preferably each valve 420-428 is a block-bleed-block valve assembly, as described above, and includes a pair of spaced apart valves 198A and 198C with a bleed valve 198B in between. Block-bleed-block valve assemblies are preferred because they prevent wash fluids and bad milk from flowing past valve seals and into other dairy lines, as described above.

(135) Clean-In-Place Dispenser Assembly

(136) As illustrated in FIGS. 17 and 18, clean-in-place dispenser assembly 500 in accordance with the present invention preferably includes: chemical tanks 549, chemical dispenser 551, check valves 553, a sensor 555, a mounting plate 558 on which are mounted a hot water valve 560, a cold water supply 562, a three-valve assembly 568, an air purge 570 for purging the clean-in-place dispenser assembly 500 and to push water into a flow diverter 576 in a cooling tank 430 to remove milk film from the tank's interior surfaces.

(137) FIGS. 18, 19A, 19B and 19C illustrates flow paths of fluids through the clean-in-place dispenser assembly 500. Water of a desired temperature and pressure, proceeds along a flow path 501. Wash chemicals proceed along flow path 502 and air proceeds along flow path 503. As is apparent from FIG. 18, the flow paths 501, 502, and 503 begin at different inlets 510, 511, 512, and 514, respectively, and all are dispensed through outlet 516. The water, chemicals, and air are provided to the clean-in-place dispenser assembly 500 at appropriate sequences, volumes, pressures, temperatures, and durations. These factors vary for each system due to size, conduit lengths, ambient temperatures, cleaning chemical selection, and other considerations.

(138) A clean-in-place dispenser valve assembly 500 is arranged similarly to those described above, and each valve 198A, B, C serves substantially the same function as described above. In this particular clean-in-place dispenser valve assembly 500, the valves 198A and 198C are closed during milking and when milk is stored in the cooling tank 430. The valve 198B is opened to provide a vent in a block-bleed-block relationship.

(139) During cleaning, the valves 198A and 198C are opened, and valve 198B is closed. Due to the pass through bore 286, fluid flows through valve 198B when it is closed. Chemical flow sensor 564 is also used.

(140) Milk Flow Sensor

(141) Suitable sensors for use in the present invention include conductivity sensors that detect and/or measure flow quantity and/or rate, as well as sensing milk quality as milk flows from or through the milking machine. A preferred suitable conductivity sensor 600 is illustrated in FIG. 20 and includes a housing 602, a bore 604, a reservoir 606 in which a conductivity probe 608 is positioned, and a slot 616 that is sized so milk can drain from the reservoir 606, but is small enough to slow flow to a rate at which a conductivity measurement is possible. The slot 616 is also preferably sized large enough so that sand, dirt or grit in the reservoir 606 can be carried out by the milk. This arrangement prevents clogging and malfunctions of the conductivity sensor 600, and yet is able to slow milk flow long enough for conductivity data to be received.

(142) Hoses used in the present invention are preferably vulcanized with stainless steel fittings and with hoses from STI Components, Inc. of Morrisville, N.C., for example. Other hose connections and manifolds are preferably continuously welded and finished to 3-A Sanitary Standards.

(143) Another suitable valve block 610 for use in dispensing sanitizer fluids is depicted in FIGS. 21A to 21D. FIGS. 21A through 21D illustrate a valve block 610 in which a number of valves are provided for supplying multiple sanitizer fluids (air, water, and sanitizers) through a common outlet 637 to the sanitizer line 128. The valve block 610 includes a housing 613 that defines an axial chamber 619 in which a spool 621 is disposed to slide between a milking position (FIG. 21C) and a sanitizing position (FIG. 21D). The axial chamber 619 includes an upper bell portion 623 and a lower bell portion 625.

(144) The housing 613 is preferably oriented vertically, as depicted, to provide drainage of fluids through a drain 634 (FIG. 21B), but other orientations can be used. Preferably, the valve block 610 housing 613 is made of Radel R5000 from Piedmont Plastics, Inc. of Charlotte, N.C. and available from distributors throughout the United States, or other translucent plastic or glass material to provide superior chemical resistance and clarity for operation and maintenance inspections. The valve block 610 housing 613 is preferably arranged and molded as an integral piece as depicted. Other materials can be used for the valve block 610 and related components, and the valve block 610 can be formed from one or more parts. Flanges 609 or other connectors can be joined to or molded integrally with the valve housing 613 to permit convenient mounting with snap-in features, screws, or other suitable fasteners.

(145) The valve block housing 613 includes several pass-through inlets 614 though which sanitizing fluids flow. Pass though inlets 614 are used so that a number of valve blocks can be arranged in series and supplied with sanitizing fluids from a common source, if desired. Other arrangements can be used, but arranging valve blocks in series requires fewer hoses for sanitizing fluids and less demand on pumps and other supply components. Flow through the pass through inlets 614 can be in either direction to accommodate a variety of dairy layouts.

(146) Most of the pass through inlets 614 communicate with a corresponding and dedicated block inlet 614a that is controlled by its respective valve to permit entry of a predetermined fluid into a chamber 619 through conduits 614b. One exception is the pass through inlet 614 for the second air valve 612, which communicates with the lower bell portion 625 of the axial chamber 619 at a position under the spool 621 via passages 635a and 635b so that pressurized air can force the spool 621 into the sanitizing position (FIG. 21D), when desired.

(147) The valve block 610 can include any number of valves corresponding to the number of sanitizing fluids used. In the illustrated embodiment there are five valves, depicted in FIG. 22A including: a first air valve 611 that provides air to push liquids from the liner 49 and somewhat dry the teat; a second air valve 612 that moves a valve block safety spool 621 into place and can provide air pressure to push sanitizing liquids such as sanitizers and water toward the liner 49 onto a teat; a third air valve 620 provides air for slugging sanitizing fluids and for complete surface rinsing and vigorous scrubbing of the dairy animal teat; a water valve 622 that provides water to be used to rinse the liner 49 and teat; and a sanitizer solution valve 624 that provides one or more chemical solutions for sanitizing teats.

(148) All valves are preferably solenoid valves, including the third air valve 620, which is preferably a pilot operated valve that ensures air flow for backflush slugging. Also preferably, the sanitizer solution valve 624 is made of stainless steel or other material that resists corrosion from the sanitizer fluids. For ease of reference, each valve is joined to the valve block 610 at a seat and each seat is designated in FIGS. 21B and 21C with a numeral matching its respective valve and including the suffix a, so that valve 620 is mounted on seat 620a, for example.

(149) The first air valve 611 is reserved for only operating the safety valve 60 to help ensure complete, independent, and safe operation of the safety valve 610. Independent operation of some valves may be desirable to avoid pressure fluctuations that could result in from sharing air supply pressure with other system components. The air from air valve 611 exits the safety valve block 610 through a separate outlet 615 for this reason. The first air valve 611 could be separate from the safety valve block 610 and mounted elsewhere in the system because it does not use the common outlet 637. Nonetheless, the safety valve block 610 provides a convenient mounting location and helps keep all of the hoses for the pass through inlets 614 organized. The second air valve 612 supplies air to the teat cup 48 and liner 49.

(150) The spool 621 (FIGS. 21C and 21D) includes an upper valve head 626 and a lower valve head 628. The upper valve head 626 and the lower valve head 628 each define an annular groove in which seals 626a and 628a are disposed, respectively. The seals 626a and 628a are preferably u-cup seals oriented as depicted to provide a sealing function in one direction each. U-cup seals provide satisfactory sealing properties and reduce friction between the seals and the central housing 613 so that the spool 621 moves relatively easily with a relatively low air pressure. The seals 626a and 628a oppose each other to seal the axial chamber 619 at their respective ends. This seal orientation can permit fluid to pass into the axial chamber 619. The spool 621 can be made of any suitable material such as stainless steel, stable plastic, or other material. The seals 626a and 628a can be made of Viton (FKM) or any rubber, silicone or other suitable material or the seals can be formed integrally with the spool 621.

(151) A valve block spring 630 biases the spool 621 toward the milking position (FIG. 21C). The valve block spring 630 engages a seat 631 on the upper valve head 626 and is contained within cap 633. An alignment rod 639 extending from the upper valve head 626 of the spool 621 fits in socket 641 (FIG. 21C) formed in a cap 633 to maintain proper alignment of the spool 621 when moving between the milking position (FIG. 21C) and the backflushing position (FIG. 21D).

(152) In the milking position (FIG. 21C), the spool 621 is forced by the valve block spring 630 to engage the upper valve head seal 626a with the walls of the axial chamber 619 to seal the common outlet 637 from the chamber 619 with an end seal 627. The lower valve head 628 is forced down into the lower bell portion 625 and does not engage the walls of the axial chamber 619, but the lower valve head 628 includes a recess 629 that fits around and seals the air outlet 617 while permitting drainage of residual fluids through drain 634. In the milking position, there is a space between the spool 621 and the walls of the axial chamber 619 that extends between most of the length of the axial chamber 619. The drain (or vent) 634 is in communication with the axial chamber 619 to bleed any differential pressure between the valves and the milk line thereby minimizing migration of dips and backflush fluids into the milk lines. The drain 634 is preferably located near the bottom of the axial chamber 619 to provide a drain for any fluids in the axial chamber 619 when the spool 621 is in the milking position.

(153) The valve block 610 can be controlled by a stall control or other controllers to move to the sanitizing position for dairy animal preparation. In the sanitizing position (FIG. 21D), the spool 621 is forced (upward as illustrated) against the bias of the valve block spring 630 by pressurized air entering the inlet 635 to move the lower valve head 628 into sealing engagement with the walls of the axial chamber 619 to seal the vent 634 and open the air outlet 617. In the sanitizing position, the upper valve head 628 does not seal anything because it is disposed in the upper bell portion 623, and opens the axial chamber 619 to the common outlet 637.

(154) The inlets for the air valve 620, the water valve 622, and the sanitizing fluid valve 624 all communicate with the axial chamber 619 through inlets 614a, so that all of these fluids can flow through the axial chamber 619 and out of common outlet 637 when their respective valves are opened and the spool 621 is in the sanitizing position. The fluids do not typically flow together, instead the various valves fire in a predetermined sequence to supply sanitizing fluids at the specific time needed by the safety valve 610, as described below. All hose connections to the valve block 610 can be made with any suitable connection, including a John Guest fitting, as depicted in outlet 617.

(155) In the present invention there are various process options. Several examples are in Chart B below.

(156) TABLE-US-00004 CHART B Process option Cycle 1 Cycle 2 Cycle 3 1 Sanitizer (2 liters) none Air 2 Water (2 liters) Sanitizer (1 liter) Air 3 Water + surfactant Sanitizer (.5 liters) Air (2 liters)

(157) Sanitizer options are available from GEA Farm Technologies, Inc., of 1 8 8 0 Country Farm Drive, Naperville, Ill. 60563 and include:

(158) BiSept0.35% (2.9% lactic acid, 0.7% sodium chlorite)

(159) Oxycide1% hydrogen peroxide

(160) Dermasept1% Capric-caprylic acid

(161) Theraderm0.25% available iodine

(162) Theratec0.5% iodine

(163) Fifteen seconds is a preferred minimum contact time for any sanitizer, but other contact times are possible depending on a particular dairy animal, ambient conditions or the type of sanitizer used.

(164) Generally, once sanitizer and/or water is applied, filtered oil-free air is admitted into the liner through the same inlet using valve 118. This air flow continues until the teat is dry and residue is removed from the milk tube.

(165) When milking is completed and the teat cups have been removed, the teat cup assembly returns to a cleaning station where all cups are backflushed into the waste line.

(166) All fluids entering the waste line are carried away from the milking box and discarded to drain. This circuit is washed during the clean-in-place process in a similar fashion as the good milk circuit is washed two to three times per day. Additional washings will be performed following extended idle periods.

(167) The present invention ensures that sanitizer fluids and dirt cannot flow into the milk line system, despite differential pressures in the milk lines and preparation system. As stated above, to prevent seepage past valves and seals, the present invention includes a type of valve arrangement described above as block-bleed-block. Standard valves and seals can fail or allow seepage due to differential pressure on opposite sides of seals used in milk, teat dip, and backflushing lines. The block-bleed-block function of the invention prevents migration of sanitizer through valves and seals into the milk lines by supplying a pair of spaced apart valves and a vent or bleed to atmosphere, with the vent being disposed between two seals. Multiple block-bleed-block arrangements are used in the invention to provide redundancy and safety both upstream and downstream from the teat cup 48 and liner 49.

(168) In the present invention, there is preferably the valve block 610 joins air, water, and sanitizer supply lines and channels them to a common valve block outlet for efficiency. The valve block 610 also provides a pressure bleeding vent between a pair of seals to further protect milk lines from contamination.

(169) In the milking position (FIG. 21C), the spool 621 is forced by the valve block spring 630 to engage the upper valve head seal 626a with the walls of the axial chamber 619 to seal the common outlet 637 from the chamber 619 with an end seal 627. The lower valve head 628 is forced down into the lower bell portion 625 and does not engage the walls of the axial chamber 619, but the lower valve head 628 includes a recess 629 that fits around and seals the air outlet 617 while permitting drainage of residual fluids through drain 634. In the milking position, there is a space between the spool 621 and the walls of the axial chamber 619 that extends between most of the length of the axial chamber 619. The drain (or vent) 634 is in communication with the axial chamber 619 to bleed any differential pressure between the valves and the milk line thereby minimizing migration of sanitizing fluids into the milk lines. The drain 634 is preferably located near the bottom of the axial chamber 619 to provide a drain for any fluids in the axial chamber 619 when the spool 621 is in the milking position.

(170) Effectiveness of an automated preparation system is recorded in the charts depicted in FIGS. 22A-B, respectively.

(171) The foregoing detailed description of the invention is for clearness of understanding the present invention, and no unnecessary limitations therefrom should be read into the following claims.