Apparatus and method for dosage and administration of liquid chemicals

Abstract

A channel block for a liquid chemical dosing apparatus. The channel block has a process outlet; a chemical liquid inlet; an evacuation outlet; a calibration column outlet; channels provided within the channel block that connect at least the process outlet, the chemical liquid inlet, the evacuation outlet and the calibration column outlet; a pressure indicator mounted to the channel block to measure the pressure of the chemical liquid entering through the chemical liquid inlet; a additional regulation valve mounted to the channel block upstream of at least one of the process outlet and the calibration column outlet; a evacuation regulation valve mounted to the channel block upstream of the evacuation outlet; at least three control valves mounted to the block configured to control the chemical liquid passing through the channels.

Claims

1. A channel block for a chemical liquid dosing apparatus having an upper surface and a bottom surface opposite to said upper surface, a front surface, and a rear surface opposite to said front surface, wherein said front surface is orthogonal to said upper surface, said channel block comprising: a process outlet positioned to allow discharge of a chemical liquid from said channel block travelling towards a delivery point of said chemical liquid; a chemical liquid inlet configured to receive said chemical liquid travelling into said channel block; an evacuation outlet positioned for evacuating excess chemical liquid in channels of said channel block in order to maintain pressure under a given pressure defined by a pressure set point in said channel block caused by said chemical liquid; a calibration column outlet configured to connect to a calibration column; channels provided within said channel block that connect at least said process outlet, said chemical liquid inlet, said evacuation outlet and said calibration column outlet; a pressure indicator mounted to said channel block to measure pressure of said chemical liquid entering through said chemical liquid inlet; an evacuation regulation valve mounted to said channel block upstream of said evacuation outlet, set at said pressure set point, and interacting with said channels to control passage of said chemical liquid through a channel of said channels connecting said chemical liquid inlet to said evacuation outlet, for evacuating from said evacuation outlet said excess chemical liquid when said pressure set point is reached in said channel connecting said chemical liquid inlet to said evacuation outlet; and at least three control valves mounted to said block configured to control said chemical liquid passing through said channels, wherein a first control valve of said at least three control valves is situated with respect to said channels to control flow of said chemical liquid to said process outlet, wherein a second control valve of said at least three control valves is situated with respect to said channels to control flow of said chemical liquid to said evacuation outlet; and a third control valve of said at least three control valves is situated with respect to said channels to control flow of said chemical liquid to said calibration column outlet.

2. The channel block as defined in claim 1, further comprising: an additional regulation valve mounted to said channel block upstream of at least one of said process outlet and said calibration column outlet, and interacting with said channels to control passage of said chemical liquid through a channel of said channels connecting said chemical liquid inlet to said process outlet; wherein said additional regulation valve is positioned with respect to said first control valve, second control valve and third control valve such that a pressure set point of said additional regulation valve may be calibrated using said pressure indicator when one of: said first control valve is in an open position, and said second control valve and said third control valve are in a closed position; and said third control valve is in an open position, and said first control valve and said second control valve are in a closed position.

3. The channel block as defined in claim 2, wherein said additional regulation valve is a back-pressure valve.

4. The channel block as defined in any claim 2, wherein said additional regulation valve is a diaphragm valve.

5. The channel block as defined in claim 2, wherein said at least three control valves, said additional regulation valve and said evacuation regulation valve are positioned on said front surface.

6. The channel block as defined in claim 1, wherein said evacuation regulation valve is positioned with respect to said three control valves such that a pressure set point of said evacuation regulation valve may be calibrated using said pressure indicator when said first control valve, said second control valve and said third control valve are in a closed position.

7. A water treatment chemical liquid dosing apparatus comprising: the channel block of claim 1; a pump connected to said chemical liquid inlet; and a calibration column connected to said calibration column outlet.

8. A method of treating water comprising: pumping chemical liquid from a source of said chemical liquid; receiving said chemical liquid at a chemical liquid inlet of a channel block so that said chemical liquid flows within channels defined within said channel block; regulating the pressure of said chemical liquid flowing in said channels of said channel block so that said pressure does not exceed a desired pressure using an evacuation outlet for evacuating excess chemical liquid of said chemical liquid, wherein passage to said evacuation outlet is controlled by an evacuation regulation valve set at a pressure set point corresponding to said desired pressure; outflowing a dosed amount of said chemical liquid from said channel block at said desired pressure towards a body of water that requires treatment; and treating said water with said chemical liquid.

9. The method as defined in claim 8, wherein said regulating is performed by a back-pressure valve of said channel block.

10. The method as defined in claim 9, further comprising, prior to said pumping, calibrating said back-pressure valve by using a pressure indicator of said channel block located at said chemical liquid by measuring the pressure of said chemical liquid entering said chemical inlet.

11. The method as defined in claim 8, further comprising cleaning said channels of said channel block by using an auxiliary port of said channel block.

12. A channel block for a liquid chemical dosing apparatus having an upper surface and a bottom surface opposite to said upper surface, a front surface, and a rear surface opposite to said front surface, wherein said front surface is orthogonal to said upper surface, said channel block comprising: a process outlet positioned to allow discharge of a chemical liquid from said channel block travelling towards a delivery point of said chemical liquid; a chemical liquid inlet configured to receive said chemical liquid travelling into said channel block; an evacuation outlet positioned for evacuating excess chemical liquid in channels of said channel block in order to maintain pressure under a given pressure defined by a pressure set point in said channel block caused by said chemical liquid; channels provided within said channel block that connect at least said process outlet, said chemical liquid inlet and said evacuation outlet; a pressure indicator mounted to said channel block to measure pressure of said chemical liquid entering through said chemical liquid inlet; an evacuation regulation valve mounted to said channel block upstream of said evacuation outlet, set at said pressure set point, and interacting with said channels to control passage of said chemical liquid through a channel of said channels connecting said chemical liquid inlet to said evacuation outlet, for evacuating from said evacuation outlet said excess chemical liquid when said pressure set point is reached in said channel connecting said chemical liquid inlet to said evacuation outlet; and at least one control valve mounted to said block configured to control said chemical liquid passing through said channels, wherein a first control valve of said at least one control valve is situated with respect to said channels to control flow of said chemical liquid to said process outlet.

13. The channel block as defined in claim 12, wherein said at least one control valve is a ball valve.

14. The channel block as defined in claim 12, wherein said channel block comprises an auxiliary port, and wherein said channels connect at least said process outlet, said chemical liquid inlet, said evacuation outlet and said auxiliary port.

15. The channel block as defined in claim 12, wherein said evacuation regulation valve is a pressure relief valve.

16. The channel block as defined in claim 12, wherein said evacuation regulation valve is a diaphragm valve.

17. The channel block as defined in claim 12, wherein said pressure indicator is a pressure gauge.

18. The channel block as defined in claim 12, wherein said chemical liquid inlet is located on a surface of said channel block other than a surface of said channel block on which said process outlet is located.

19. The channel block as defined in claim 12, said rear surface further comprising a mounting to secure said channel block to a vertical surface.

20. The channel block as defined in claim 12, wherein said channel block is composed of at least two sub-blocks.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) The invention will be better understood by way of the following detailed description of embodiments of the invention with reference to the appended drawings, in which:

(2) FIG. 1A is a drawing of a front-oblique view of an exemplary chemical dosing channel block;

(3) FIG. 1B is a drawing of a front-oblique view of another exemplary chemical dosing channel block;

(4) FIG. 2 is a drawing of a front cross-sectional view of an exemplary chemical dosing channel block;

(5) FIG. 3 is a drawing of a close-up front view of an exemplary chemical dosing channel block showing an exemplary opening and an exemplary groove to receive an exemplary a stem and handle of an exemplary ball-valve and guide the handle of the ball valve;

(6) FIG. 4 is a drawing of cross-sectional front view of an exemplary ball valve of an exemplary chemical dosing channel block;

(7) FIG. 5 is a drawing of cross-sectional side view of an exemplary chemical dosing channel block;

(8) FIG. 6 is a drawing of a front view of an exemplary water treatment chemical dosing apparatus having an exemplary channel block, an exemplary calibration column, and an exemplary pump;

(9) FIG. 7 is a flowchart of an exemplary method of calibrating a pressure-relief valve;

(10) FIG. 8 is a flowchart of an exemplary method of calibrating a back-pressure valve;

(11) FIG. 9A is a drawing of a front-oblique view of an exemplary pump integrated to an exemplary channel block;

(12) FIG. 9B is a drawing of a cross-sectional front-oblique view of an exemplary pump integrated to an exemplary channel block;

(13) FIG. 10 is a flowchart of an exemplary method of calibrating an exemplary dosage apparatus using a calibration column;

(14) FIG. 11 is a flowchart of an exemplary method of treating untreated water using an exemplary dosage apparatus including an exemplary channel block;

(15) FIG. 12A is a drawing of a side view of an exemplary pump integrated to an exemplary channel block; and

(16) FIG. 12B is a drawing of a cross-sectional side view of an exemplary pump integrated to an exemplary channel block.

DETAILED DESCRIPTION

(17) The present application relates to a channel block, tailored for the purposes of chemical dosing for water treatment, having internally channels adapted to receive and direct chemicals between different inlets and outlets of the channel block. The channel network contained with the channel block provides for a mechanism to direct the chemicals while reducing the risks of chemical leakage. The configuration of the channels may vary depending upon the desired passage of the chemical liquid, or the configuration of the channel block (e.g. number of ports; number of components, etc.) The different valves for directing and controlling the flow of chemicals within the channels of the channel block are directly mounted onto the channel block.

(18) The channel block is configured to allow for the passage of a liquid therein (e.g. chemical liquid). It will be understood, however, that even though the channel block is configured to transport liquid, some gases may be found in the channel block (e.g. as a result of chemical reactions, chemical breakdown, etc.), and require evacuation as explained herein. Moreover, some of the chemical liquid may also solidify (e.g. crystallize) in the channels or in the channel block, requiring cleaning of the channel block.

Definitions

(19) In the present application, by “process outlet” it is meant an outlet to allow for chemical liquid to travel out from the channel block towards a delivery point for the chemical liquid, such as a body of water that is to be treated (e.g. water tank, water basin), a processing unit for the chemical liquid, etc.

(20) In the present application, by “evacuation outlet” it is meant an outlet to evacuate chemical liquid that is in the channel block, such as when the pressure of the chemical liquid is too high, and the chemical liquid flows, for example, through the pressure-relief valve, or when the calibration column is being emptied, etc.

(21) In the present application, by “chemical inlet” it is meant the entry point of the chemical liquid into the channel block, for instance, that is being pumped by a pump from a source of the chemical liquid.

(22) In the present application, by “calibration column outlet” it is meant an outlet that allows the chemical liquid to enter and/or exit the calibration column from and/or into the channel block.

(23) Channel Block:

(24) Reference is made to FIG. 1A illustrating an exemplary chemical dosing channel block 100. For the purposes of illustration, in FIG. 1A, channel block 100 is shown as being two modular blocks 1 and 2. However, channel block 100 may be one single block as shown in FIG. 1B. Moreover, in some examples, channel block 100 may be composed of a plurality of modular blocks, where each of the blocks is configured to join with another in order to form a composite channel block. Additionally, the configuration, and the geometry of the modular block(s) can vary depending on the application and the integrated features.

(25) Exemplary channel block 100 has one lower block 1 with four connecting ports, an integrated valve 6 and a top interface to be assembled with an upper block 2. In some examples, integrated valve 6 (also defined as a regulation valve 6) is a diaphragm valve. In some examples, integrated 6 is a pressure relief valve.

(26) Channel block 100 also has one upper block 2 with three connecting ports, three integrated ball valves. In some examples, channel block 100 may have an integrated valve 5 (also defined as a regulation valve 5) and a lower interface to be assembled with the lower block 1 (in the example where channel block 100 is composed of more than one modular block). In some examples, integrated valve 5 is a diaphragm valve. In some examples, integrated valve 5 is a back-pressure valve.

(27) In some examples, the pump may regulate the pressure entering the chemical inlet port, so there may be any need for an integrated valve 5.

(28) Lower Block 1:

(29) The lower block 1 may have a number of ports configured to act as inputs and outputs, connected to the channels of the lower block 1. For instance, the lower block 1 has three ports. In this example, port 3 is the chemical inlet which is directly connected to the dosing pump discharge line. The port 4 can be used to connect with a pressure indicator to measure the pressure of the chemicals flowing in the channel to which it is connected. In some examples, the pressure indicator 7 is positioned in proximity integrated valve 5 and integrated valve 6, where the pressure reading allows the operator to adjust the set point of the diaphragm valves 5 and/or 6. In some examples, the pressure indicator 7 is a pressure gauge with an isolator 8. It will be understood that other pressure indicators may be used.

(30) In this example, the port 9 (evacuation outlet) serves as a tank return port for the pressure relief valve 6 outlet and the upper block/calibration column drainage. In some examples, a same port may be used as a chemical inlet for receiving chemical into the channel block 100, and an outlet to drain chemical from the channel block 100.

(31) In some examples, the port 10 can serve as an auxiliary port where a variety of components can be connected and installed thereto, such as, e.g., a pressure transmitter. In some examples, port 10 can also be used as a cleaning port. In some examples, the top surface of the lower block 1 is mountable to the lower face of the upper block 2. In one example, the two blocks 1 and 2 are assembled with mounting screws and aligned with at least two dowel pins. It will be understood that other mechanisms to assemble blocks 1 and 2 may be used without departing from the present teachings.

(32) The lower block 1 has located within channels 11 to allow the communication/passage of the fluid between the ports and the components.

(33) Upper Block 2:

(34) In some examples, the upper block may be equipped with mounting holes 12 that allow the module to be installed vertically to, for instance, a panel, wall or any other plane surface.

(35) In some examples, the upper block 2 has three ball valves. It will be understood that upper block 2 may have more or less valves depending on the desired flow and control of the passage of chemicals therein. In some examples, each of the three ball valves may have a housing with, in some examples, sub-housings 13 that are directly integrated inside the block. The bottom portion 14 may serve as guide for the seat 25, the middle portion 15 is the ball valve chamber where the ball 23 has room to rotate and the top portion 16 is threaded for the carrier and connector to be screwed in. The block 2 may also feature a hole 17 adapted to receive a stem 27, and a groove 18 to guide movement of the valve handle 28. The ports 19 and 20 can either be used as an outlet (to process) port or for the bottom mount of the calibration column 110.

(36) In some examples, upper block 2 may have a port 21 that may serve as an auxiliary port to which, e.g., a variety of components can be installed such as: a pulsation dampener, pressure indicator, pressure transmitter, etc. In some examples, port 21 can also be used as a cleaning port. The upper block has channels 22. The channels 22 are located inside the block and allow the communication/passage of the fluids between the ports and the components.

(37) Ball Valves:

(38) Reference is made to FIGS. 4 and 5 illustrating an exemplary ball valve of a channel block 100.

(39) The exemplary ball valve 50, a control valve, is composed of a ball 23, a carrier 24, two seats 25 and 26, a stem 27 and a handle 28. The ball 23 is spherical with a hole at its center to allow the passage of fluid and with a groove on one side to be driven by the stem 27. The transition from an open to a closed ball valve position (and the opposite) can be attained by rotating the ball 23. The stem 27 is responsible for transferring the torque of the handle 28, induced by the operator, to the ball inside the block 2. The handle 28 is limited in its rotation by the groove 18 located on the block face. The two valve seats 25 and 26 are responsible for maintaining a sealed surface around the ball 23. The seat 25 is located at the bottom of the ball valve housing 13 inside the block 2. The seat 26 is located in the carrier 24. The purpose of the carrier 24 is to create a pressure between the ball 23 and the two seats 25 and 26, squeezing the ball 23 in place and constraining its translational movement. This pressure also allows the seal to be made between the ball 23 and the two seats 25 and 26. The threaded portion of the carrier 24 is screwed inside the upper portion of the ball valve housing 16 on the block 2. The end connector 30 will also be screwed on the top portion of the valve housing. One end will be seated on the carrier 24 and the other will be connected either directly to an instrument or to a piping/tubing. The type of connector can vary from a flanged connection, threaded connection, welded connection, etc.

(40) In some examples, the connector 30 may be protruding from a surface of the channel block 100, as is shown in FIGS. 4 and 5. However, in other embodiments, the connector may be flush with a surface of the channel block, where, for instance, a sealer (e.g.; a seal ring; an O ring) may be used to seal off the connection between the connector and an external component (e.g. another channel block; an instrument; piping or tubing, etc.), creating a watertight and/or airtight seal. In some examples, the connector may be sunken with respect to the surface of the channel block 100, where the connecting portion of the external component is configured to join within the connector within the channel block 100.

(41) In some embodiments, the connector 30 is part of the external component, where the connector 30 of the external component is configured to fit at least partially within the valve housing and connect with the channel block 100.

(42) Pressure Relief/Back Pressure/Diaphragm Valve/Pressure Regulating Valve:

(43) The channel block 100 may have two integrated valves 5 and 6. In some examples, as shown in FIG. 1B, the channel block 100 has only integrated valve 6. It will be understood that the number of diaphragm valves of channel block 100 may vary depending on the configuration, purposes and the channel formation of channel block 100.

(44) The integrated valve 5 of exemplary channel block 100 operates as a back-pressure valve. Integrated valve 5 maintains a certain set pressure on the pump discharge line (e.g. connected to pump 120) and the lower block inlet port 3 during normal operation. Maintaining a constant pump discharge pressure allows for a better flow precision. It will be understood that volumetric pumps may generate a slightly different flow depending on the suction and discharge pressure for a given pumping set point. By fixing the discharge pressure, the variation may be limited, allowing for better precision. The integrated valve 6 may be a pressure relief valve. Integrated valve 6 may be configured to evacuate the pump liquid coming from the pump discharge line into the lower block inlet port 3 to limit the inlet pressure in a condition that the fluid can no longer flow through one of the possible exists 19 and 20. Integrated valve 6 may serve as a safety feature to protect the system from a failure caused by excessive pressure.

(45) Reference is made to FIG. 5 illustrating an exemplary integrated valve 5 configured as a back-pressure valve (or an integrated valve 6 configured as a pressure-relief valve). Integrated valve 5 may have a bolt or knob (31 or 32) that can be adjusted (e.g. tightened or loosened) to set its pressure set point. Exemplary integrated valve 5 may have an upper assembly including an upper body/bonnet 33, a spring 34, a lower spring seat 35, an upper spring seat 36, an adjusting screw 32 with locking nut 37 and a diaphragm 38. The upper assembly of integrated valve 5 may be configured to mount directly to the blocks 1 and 2. The fluid passages 40 and 41 delimitated by the diaphragm seat 42 may be integrated to one the blocks (e.g. block 1 and/or block 2).

(46) The pressure set point of the integrated valve 5 will be adjusted and fixed by screwing and unscrewing the adjustment screw 32 into the threads of the upper body 33 threads. As a result, the adjustment screw 32 constrains via the upper seat 36 the spring 34 into a compressed position. The compressed spring 34 applies a force on the lower spring seat 35 that is transmitted on the diaphragm 38 which is seated on the diaphragm seat 42. In order to lift the diaphragm 38, the fluid has to create sufficient pressure to exceed the pressure applied by the lower spring seat 35. By lifting the diaphragm 38, fluid is then able to pass from the valve inlet channel 40 to the valve outlet channel 41. The diaphragm 38 is compressed on its peripheral by the assembly of the upper body 33 and the block 2 which creates a seal.

(47) In some examples, where not all ports of the channel block 100 are being used, a cap 43 may be provided, as shown in FIG. 2, shaped to plug the unused or unnecessary ports of the channel block 100.

(48) Reference is now made to FIG. 6, illustrating an exemplary water treatment chemical dosing apparatus having a channel block (e.g. channel block 100), connected to a pump 100 for pumping a liquid to the channel block. The water treatment chemical dosing apparatus also has a calibration column 110 connected to the channel block 100.

(49) Pump Integrated to Channel Block:

(50) Reference is made to FIGS. 9A and 9B, illustrating an exemplary pump 120 integrated to a channel block 100. Another exemplar pump 120 integrated to a channel block 100 is illustrated in FIGS. 12A and 12B.

(51) The pump 120 may be entirely or partially integrated to the channel block 100.

(52) The pump 120 is directly connected to the channel block 100, where there is no conduit present between the pump 120 and the channel block 100. Therefore, the chemical liquid may pass directly from the pump 120 into a channel (or channels) of the channel block 100. The pump pumps the chemical liquid directly into the channel block (without passing through a conduit to reach the channel block).

(53) The following are non-limiting examples of pumps at least partially integrated into said channel block. In some examples, the integrated or partially integrated pump 120 (e.g. the pump head of the pump) may come into contact and be joined to a surface of the channel block 100 (e.g. the surface with the process outlet, or the surface with the chemical inlet), where the chemical liquid may flow from the pump head into a channel of the channel block 100 (e.g. through a port of the channel block 100). In other examples, a part of the integrated or partially integrated pump 120 (e.g. the pump head) may be partially incorporated into the channel block 100, where a space may be present in the channel block 100 (e.g. for receiving the pump;) to which the pump 120 (e.g. the pump head) may mate. In some examples, the entire head 153 of the integrated or partially integrated pump 120 may be integrated into the channel block 100, including, e.g., the inlet and outlet of the pump, where the chemical liquid flows through the pump into a channel of the channel block (in some examples, it may flow from a channel or port of the channel block to the pump inlet, and from the pump outlet back into a channel of the channel block or towards a port of the channel block).

(54) As shown in FIG. 9B, for an exemplary diaphragm pump 120, the check valves 150, the pump diaphragm 151 and the actuating rod 152 of the pump 120 may be integrated (or, in some examples, partially integrated), to the channel block 100, where the parts of the pump 100 are integrated into the channel block 100. As shown in FIG. 9B, one of the check valve 150 is integrated within the channel block 100 and is in communication with the chemical inlet of the channel block 100. The other check valve is in communication with a channel of the channel block 100.

(55) In some examples, the pump 120 may cycle through suction strokes and discharge strokes. During a suction stroke the pump 120 may pull (e.g. mechanically, magnetically, etc.) on the diaphragm 151 using the actuating rod 152. By moving the diaphragm 151 out of the pump's head chamber 156, a vacuum pressure is created. This vacuum pressure results in the closing of the upper check valve 150 and allows for the introduction of new liquid into the constantly increasing volume of the pump head chamber 156. This liquid may be introduced via the inlet connector 154, then through the lower check valve 150 and into the pump head chamber 156. Once the suction stroke motion is completed, the discharge stroke may begin. In some examples, the discharge stroke may be characterised by the pump 120 pushing (e.g. mechanically, magnetically, etc.) back the diaphragm 151 into the pump's head chamber 156 using the actuating rod 152. This motion creates a positive pressure, closing the lower check valve 150 and forces the fluid into the channel block 100 through the upper check valve 150. The volume of the pump head chamber 156 decreases during the entire discharge stroke. Once the discharge stroke is done, the next suction stroke of the pump 120 may begin. The pump 120 may operate by cycling through suction strokes and discharge strokes.

(56) In some examples, the pump head 153 may be equipped with four valves 150, two on the pump head suction (lower) side and two on the discharge (upper) side. In some embodiments, a valve 150 may be equipped with spring 157 (the valves 150 equipped with springs 157) adapted to help the check valves 150 close properly. In some examples, the pump head 153 may be equipped with a pressure transmitter 155 reading the pressure inside the pump head chamber 156. The readings obtained by the pressure transmitter 155 may be displayed or transmitted via wireless or wired connection to, e.g., a controller, allowing for controlling or monitoring the operation of the pump 120.

(57) For illustrative purposes, exemplary pump 120 is shown as being a diaphragm pump. However, it will be understood that pump 120 may be any other pump for pumping chemical liquid through the channel block 100 without departing from the present teachings, where the pump is at least partially integrated into the channel block 100.

(58) The pump 120 may have a mounting 125 (e.g. brackets; a stand—for example, rooted to the floor or secured to a vertical surface—on which the pump 120 is positioned; rods attaching the pump to the ceiling) for securing the pump 120 to a surface, such as a wall, the ground, a ceiling, etc. The mounting may be connected or connectable to at least one surface of the pump 125, such as a rear surface, a side surface, or its base. As the channel block 100 is integrated to the pump 120, the pump 120 provides support for the channel block 100, supporting at least in part the weight of the channel block 100.

(59) In some examples, the channel block may also have a mounting device 115 (e.g. brackets) to secure the channel block to a vertical surface, such as a wall.

(60) The valves located on the surface of the channel block 100 may be, in some examples, placed in the same direction as the pump 120, such that a user can access the pump and the valves from the front (as shown in FIGS. 12A and 12B).

(61) As shown in FIG. 12B, the channel from the check valve 150 leading to the pump 120 may be angled with respect to the base of the channel block 100, and with respect to the channel leading from the pump 120 to the upper check valve 150.

(62) Calibrating a Pressure-Relief Valve:

(63) The pressure-relief valve 6 provides an outlet for the chemical liquid when the pressure of chemical liquid in the channels of the channel block is too great (e.g. as a result of a block), which may jeopardize the integrity of the water treatment apparatus if the liquid is not evacuated. In some examples, the pressure-relief valve 6 may be placed so that it can control the liquid flowing through the channel(s) between the chemical inlet to receive the chemical liquid (e.g. port 3) and the evacuation outlet to discharge the chemical from the channel block (e.g. port 9).

(64) Reference is made to FIG. 7 illustrating an exemplary method 700 for calibrating a pressure-relief valve mounted to a channel block, such as channel block 100.

(65) Ball valves 51, 52 and 53 of channel block 100 are positioned in a closed position at step 710. It will be understood that, depending upon the configuration and properties of the channel block, the number and configuration of the ball valves that are to be in a closed position may vary, where the open or closed state of the ball valves may be determined to provide a path for the chemical liquid that is to flow from the chemical inlet towards the evacuation outlet, and towards the pressure-relief valve positioned upstream of the evacuation outlet.

(66) The chemical liquid is then provided (e.g. pumped) into the channel block through the chemical inlet at a given pressure at step 720. In some examples, the pressure of the chemical liquid may be set and/or adjusted by the pump.

(67) The pressure of the chemical liquid is then measured at, for instance, pressure indicator 7 at step 730. The pressure may be adjusted to a given pressure at which the pressure set point of the pressure relief valve is to be set. Preferably, the pressure of the chemical liquid is provided initially at a low pressure, and gradually increased until the desired pressure is reached. It may be observed by monitoring the flow through the evacuation outlet if the chemical liquid is passing through the pressure relief valve. If chemical liquid is passing through the pressure relief valve, but the chemical liquid is allowed to pass at a pressure lower than what is sought (indicating that the pressure set point is too low), then the pressure set point can be adjusted (e.g. for a diaphragm valve, by compressing the spring using the adjustment screw) at step 740 until the desired pressure set point is reached. Similarly, it will be understood that the reverse may be performed if the pressure set point is too high.

(68) Calibrating a Back-Pressure Valve:

(69) Reference is now made to FIG. 8, illustrating an exemplary method 800 for calibrating a back-pressure valve 5. A back-pressure valve may be provided to regulate the flow of the chemical liquid passing through a channel or through channels that connect the chemical inlet to the process outlet. The back-pressure valve is placed upstream from the process outlet. The back-pressure valve may allow for the flow of the chemical liquid when the pressure of the chemical liquid is greater than a pressure set point of the back-pressure valve.

(70) Ball valve 51 is placed in a closed position, and either ball valve 52 or ball valve 53 are placed in an open position where the other is in a closed position at step 810. It will be understood that, depending upon the configuration and properties of the channel block, the number and configuration of the ball valves that are to be in a closed position may vary, where the open or closed state of the ball valves may be determined to provide a path for the chemical liquid that is to flow from the chemical inlet towards the process outlet (and/or the calibration column outlet), and towards the back-pressure valve positioned upstream of the process outlet.

(71) The chemical liquid is then provided (e.g. pumped) into the channel block through the chemical inlet at a given pressure at step 820. In some examples, the pressure of the chemical liquid may be set and/or adjusted by the pump.

(72) The pressure of the chemical liquid is then measured at, for instance, pressure indicator 7 at step 830. The pressure may be adjusted to a given pressure at which level the pressure set point of the back-pressure valve is to be set. Preferably, the pressure of the chemical liquid is provided initially at a low pressure, and gradually increased until the desired pressure is reached. In some examples where the channel block has a pressure-relief valve, where the pressure-relief valve has already been calibrated, it is possible to start calibration at higher liquid chemical pressure levels, as the chemical liquid may exit, for instance, through the pressure-relief valve if the pressure of the chemical liquid is undesirably high.

(73) It may be observed, by monitoring the flow through the process outlet, if the chemical liquid is passing through the back-pressure valve. If chemical liquid is passing through the back-pressure valve, but the chemical liquid is at a pressure lower than that which is sought, then the pressure set point can be adjusted (e.g. for a diaphragm valve, by compressing the spring using the adjustment screw) at step 840 until the desired pressure is reached. The reverse is possible if the pressure of the chemical liquid passing through the back-pressure valve is too high. In some examples, it will be understood that the pressure set point of the back-pressure valve is set at a value lower than the pressure set point of the pressure-relief valve.

(74) In some examples, the back-pressure valve may reduce the pressure of the chemical liquid that passes therein so that the pressure of chemical liquid entering the process outlet is lowered.

(75) Calibrating the Chemical Dosage Apparatus Using a Calibration Column:

(76) Reference is now made to FIG. 10 illustrating an exemplary method 900 for calibrating an exemplary dosage apparatus using a calibration column mounted to a channel block, such as channel block 100.

(77) Ball valves 51 and 52 are closed at step 910. Ball valve 53 leading to the calibration column is left open. It will be understood that other configurations of open/closed ball valves, depending upon the configuration or properties of the channel block, may be used in order to create a path to allow chemical liquid to flow from the chemical inlet to the calibration column without taking any other paths.

(78) Chemical liquid is then pumped through the channel block to the calibration column at step 920. By comparing the volume that should have been pumped in reference to the pump flow set point (pump flow set point×time of pumping=volume.sub.expected) with the volume received in the calibration column (final volume−initial volume=volume.sub.received), the correction factor can be adjusted in the pump settings. Some pumps are equipped with a calibration feature that allows for a preset calibrating volume (no need for the calculation of pump flow set point×time of pumping). This allows for the calibration of the dosage apparatus.

(79) Ball valve 51 is then opened at step 930. Ball valve 53 is left in an open position. Ball valve 52 is left in a closed position. It will be understood that other configurations of open/closed ball valves, depending upon the configuration or properties of the channel block, may be used in order to create a path to allow chemical liquid to flow from the calibration column to the evacuation outlet. The chemical liquid is then allowed to flow from the calibration column at step 940.

(80) Once the chemical liquid has drained from the calibration column, ball valves 51 and 53 are closed, and ball valve 52 is opened at step 950. This allows the chemical liquid that is being pumped to flow directly from the chemical inlet to the process outlet. It will be understood that other configurations of open/closed ball valves, depending upon the configuration or properties of the channel block, may be used in order to create a path to allow chemical liquid to flow from the chemical inlet to the process outlet without taking any other paths.

(81) Method for Performing Water Treatment:

(82) Reference is made to FIG. 11, illustrating an exemplary method 1000 of treating a body of water with a chemical liquid using a chemical dosage apparatus having a channel block.

(83) The regulation valves of the channel block (e.g. back-pressure valve and pressure-relief valve), as well as the dosage apparatus, may be calibrated prior to pumping chemical liquid towards the untreated body of water, the calibration performed as explained herein.

(84) The chemical liquid is pumped (e.g. by a pump connected to a source of chemical liquid) from the source of chemical liquid at step 1010.

(85) The chemical liquid enters the chemical inlet of the channel block at step 1020, entering the channels of the channel block. The flow through the channel block of the dosage apparatus provides for a vehicle to receive the chemical liquid that minimizes risks of leaks and spillage as the channels are integrated with the modular block(s).

(86) The pressure of the chemical liquid is regulated within the channel block, where, for instance, a regulation valve (e.g. back-pressure valve with a given pressure set point) may be used to control the pressure of the chemical liquid that flows from the chemical inlet to the process outlet at step 1030.

(87) A dosed amount of the chemical liquid then flows out of the channel block from its process outlet towards the water requiring treatment at step 1040.

(88) The untreated water then receives the chemical liquid for its treatment at step 1050.

(89) Optionally, the channels of the channel block may be cleaned periodically at step 1060. This may be to remove residue accumulating in the channels, such as crystallized or solidified chemicals. The channels may be cleaned by using the auxiliary port of the channel block.

(90) The description of the present invention has been presented for purposes of illustration but is not intended to be exhaustive or limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art.