VALVE ASSEMBLY HAVING IMPROVED ROTATIONAL FEEL

Abstract

A valve assembly includes a valve housing having an internal generally cup-shaped bore, a valve control cartridge inserted into the bore and having a rotatable control stem extending upwardly therefrom, and a bonnet nut having a through-bore. The bonnet nut is threaded to the valve housing such that the control stem extends through the through-bore. Flexible fingers are provided along the through-bore to control a level of resistance to a rotation of the rotatable control stem. The stem is positioned to frictionally engage the flexible fingers as the stem is rotated.

Claims

1. A valve assembly, comprising: a valve housing having an internal generally cup-shaped bore; a valve control cartridge inserted into the bore and having a rotatable control stem extending upwardly therefrom; and a bonnet nut having a through-bore, the bonnet nut coupled to the valve housing such that the control stem extends through the through-bore; wherein flexible fingers are provided along the through-bore to control a level of resistance to a rotation of the rotatable control stem; wherein the rotatable control stem is positioned to frictionally engage the flexible fingers as the rotatable control stem is rotated.

2. The valve assembly of claim 1, wherein the bonnet nut is threaded to an internal wall of the valve housing.

3. The valve assembly of claim 2, wherein the valve housing comprises internal threads and the bonnet nut comprises external threads, the external threads of the bonnet nut engaging the internal threads of the valve housing.

4. The valve assembly of claim 1, wherein the bonnet nut comprises a counterbore axially aligned with the through-bore, and wherein the valve housing is received in the counterbore.

5. The valve assembly of claim 4, wherein flexible fingers are provided along the counterbore.

6. The valve assembly of claim 4, wherein flexible fingers are provided along a surface between, and perpendicular to, the counterbore and the through-bore.

7. The valve assembly of claim 1, wherein the flexible fingers are formed of an elastomeric material.

8. The valve assembly of claim 1, wherein the bonnet nut is coupled to the valve housing via bayonet mounting.

9. A valve assembly, comprising: a valve housing having a bore; a valve control cartridge inserted into the bore, the valve control cartridge including one or more tabs configured to be rotationally align and fix the valve control cartridge in relation to the bore of the valve housing, the valve control cartridge also including a rotatable control stem extending upwardly therefrom; and a bonnet nut having a through-bore, the bonnet nut coupled to the valve housing such that the control stem extends through the through-bore; wherein the rotatable control stem is positioned to engage the flexible fingers as the rotatable control stem is rotated.

10. The valve assembly of claim 9, wherein the flexible fingers control a level of resistance to a rotation of the rotatable control stem.

11. The valve assembly of claim 9, wherein the bonnet nut is threaded to an internal wall of the valve housing.

12. The valve assembly of claim 11, wherein the valve housing comprises internal threads and the bonnet nut comprises external threads, the external threads of the bonnet nut engaging the internal threads of the valve housing.

13. The valve assembly of claim 9, wherein the bonnet nut comprises a counterbore axially aligned with the through-bore, and wherein the valve housing is received in the counterbore.

14. The valve assembly of claim 13, wherein the flexible fingers are provided along the counterbore.

15. The valve assembly of claim 9, wherein the flexible fingers are formed of an elastomeric material.

16. The valve assembly of claim 9, wherein the bonnet nut is coupled to the valve housing via bayonet mounting.

17. A method of manufacturing a valve assembly, comprising: providing a valve housing having an internal generally cup-shaped bore; providing a valve control cartridge inserted into the bore and having a rotatable control stem extending upwardly therefrom; and providing a bonnet nut having a through-bore, the bonnet nut coupled to the valve housing such that the control stem extends through the through-bore; wherein flexible fingers are provided along the through-bore to control a level of resistance to a rotation of the rotatable control stem; wherein the rotatable control stem is positioned to frictionally engage the flexible fingers as the rotatable control stem is rotated.

18. The method of claim 17, wherein the bonnet nut is threaded to an internal wall of the valve housing.

19. The method of claim 18, wherein the valve housing comprises internal threads and the bonnet nut comprises external threads, the external threads of the bonnet nut engaging the internal threads of the valve housing.

20. The method of claim 17, wherein the bonnet nut comprises a counterbore axially aligned with the through-bore, and wherein the valve housing is received in the counterbore.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0028] FIG. 1 is a front plan view of a valve assembly of the present invention;

[0029] FIG. 2 is an exploded perspective view of an upper portion of that valve assembly;

[0030] FIG. 3 is an exploded perspective view of certain components of the valve assembly;

[0031] FIG. 4 is an exploded perspective view of a lower portion of that valve assembly;

[0032] FIG. 5 is a lower perspective view of a stationary disk of the valve assembly;

[0033] FIG. 5A is a lower perspective view of an alternate form of the stationary disk;

[0034] FIG. 6 is a bottom plan view of that stationary disk;

[0035] FIG. 7 is a sectional view taken through lines 7-7 of FIG. 6;

[0036] FIG. 8 is a bottom plan view of that stationary disk, with a lower valve seal mounted thereon;

[0037] FIG. 9 is a lower perspective view of a moveable disk of the present invention;

[0038] FIG. 9A is a lower perspective view of an alternate form of the moveable disk for use with the stationary disk in FIG. 5A;

[0039] FIG. 10 is a top plan view of the moveable disk;

[0040] FIG. 11 is a cross-sectional view taken along line 11-11 of FIG. 10;

[0041] FIG. 12 is a cross-sectional view taken along line 12-12 of FIG. 10;

[0042] FIG. 13 is an enlarged perspective view of a bonnet nut of the valve assembly;

[0043] FIG. 14 is a cross-sectional view taken along line 14-14 of FIG. 13;

[0044] FIG. 15 is a cross-sectional view of the valve assembly of FIG. 1;

[0045] FIG. 16 is a cross-sectional view taken along line 14-14 of FIG. 13, according to an exemplary embodiment.

[0046] FIG. 17 is a cross-sectional view taken along line 14-14 of FIG. 13, according to an exemplary embodiment.

[0047] FIG. 18 is a cross-sectional view taken along line 14-14 of FIG. 13, according to an exemplary embodiment.

[0048] FIG. 19 is an exploded perspective view of an upper portion of the valve assembly shown in FIG. 1.

DETAILED DESCRIPTION

[0049] Referring first to FIG. 1, a valve assembly 10 is shown oriented along a longitudinal axis A. A valve stem 12 extends out from a bonnet nut 14 that is threaded into the valve housing 16. The valve housing 16 has a pair of retaining segments 20 defining a harbor slot there between. Also, there may optionally be a flange 22 near the top of the valve housing 16. As will be understood from FIG. 4, there can be a hose clip 24 inserted into the harbor slot which holds a fluid inlet hose 26 and a fluid outlet hose 28 in recesses of the valve housing 16 by engaging the slot and the hoses 26 and 28.

[0050] Referring next to FIG. 2, there is shown a valve cartridge 30 inserted into an internal bore 32 of the valve housing 16 and retained in the valve housing 16 by the bonnet nut 14. The valve cartridge 30 includes valve stem 12 which protrudes out. There can be tabs 36 that rotationally align and fix the valve cartridge housing 34 in relation to appropriate structures in the internal bore 32.

[0051] Once the valve cartridge 30 is inserted into the bore 32, the bonnet nut 14 is threaded into corresponding threads along the internal bore to secure the valve cartridge 30 in the bore 32. Note in FIG. 13 exterior threads 38 which engage with the interior threads 40 as shown in FIG. 2. Referring to FIG. 19, according to some embodiments, the bonnet could instead be connected using bayonet mounting 39, 41.

[0052] Referring now to FIG. 3, the valve cartridge housing 34 retains a number of components including a glide washer 42, an o-ring 44, the valve stem 12, a disk adapter 46, a moveable disk 48, a stationary disk 50, and a lower valve seal 52. The washer 42 and o-ring 44 seal the interface between the top of the valve cartridge housing 34 and the valve stem 12.

[0053] The o-ring 44 may be inserted into one of the grooves 54 on the valve stem 12. The valve stem 12 has the usual splined end 56 adapted for attachment to a control handle (not shown). The valve stem 12 also includes a transverse tab 58 which can be used to restrict the range of rotation of the valve stem 12 within the valve cartridge housing 34 by placing appropriate structures along the internal bore.

[0054] The valve stem 12 also has a bar-like drive foot 60 which can be inserted into one of a cross-shaped pair of slots on the mating face of the disk adapter 46, depending on whether right hand or left hand rotation is desired. The drive foot 60 rotatably drives the disk adapter 46 as the valve stem 12 is rotated. An axially extending notch 62 at a point along the circumference of the disk adapter 46 may be used to properly align the adaptor and identify such alignment.

[0055] The disk adapter 46 also has a pair of axially downwardly extending tabs 64 that can be inserted into tab cutouts 66 on of the moveable disk 48 to permit the adaptor to rotatably drive the moveable disk 48. Importantly, the moveable disk 48 has a pair of recesses 68 separated by a partition wall 70 on its lower face 71. The face 71 of the moveable disk 48 is placed flush in contact with the stationary disk 50.

[0056] The stationary disk 50 has a pair of apertures 72 extending from face 73 to a lower face 76. These are defined by a wall 74, such that they appear back-to-back D-shaped. The stationary disk 50 also has a pair of tabs 75 to rotationally fix the stationary disk 50 in the valve cartridge 30 by inserting the tabs 75 into stops in the valve cartridge. A lower valve seal 52 may be inserted into a recessed groove 77 on the lower face 76 of the stationary disk 50.

[0057] It should be appreciated that the disk adapter 46 might be eliminated by projecting the stem directly into the movable disk (e.g. if the control stem of the valve assembly 10 consistently needs to be turned in one direction to open the valve).

[0058] Referring next to FIG. 4, it can be observed how the fluid inlet hose 26 and the fluid outlet hose 28 are preferably connected to the valve housing 16. The fluid inlet hose 26 has an attachment end 78 having an annular recess 80, and the fluid outlet hose 28 has an attachment end 82 having an annular recess 84. In addition, appropriate grooves can be provided to receive O-rings 92 adjacent these ends.

[0059] The attachment ends 78 and 82 are inserted into recesses 86 and 88 of a harbor portion of the valve housing. As will be appreciated from FIG. 15, these recesses are in fluid communication with a fluid inlet port 116 and a fluid outlet port 118 that extend to the internal bore 32.

[0060] Hose clip 24 can be inserted into the slot formed by the retaining segments 20 on the valve housing 16 to simultaneously engage the attachment ends 78 and 82 of the hoses 26 and 28 by engaging the recesses 80 and 84.

[0061] The clip 24 has two legs 91 connected by a waist 93. These define a receiving area 95 there between. There are also notches 97 near the lower heel of the legs 91. When the tubes are axially aligned one over the other the receiving area 95 helps catch the tubes between legs 91. Notches 97 then help catch the lower tube.

[0062] This clipped attachment system is advantageous because it permits two hoses to be held in place with the insertion of a single clip. Moreover, because the clip can easily be slid into place, it is easier to connect hoses than it would be to do so using a threading system.

[0063] Of course, other ways of having a single sliding clip catch two tubes simultaneously could be used. For example, a single prong could extend into catch grooves on the inward sides of the tubes, rather than requiring two prongs.

[0064] Referring now to FIGS. 5-8, the stationary disk 50 is shown in greater detail. It may be made of a ceramic material which has a lower valve seal 52 made of a different material inserted into the recessed groove 77 to seal the space between the stationary disk 50 and the bore 32.

[0065] FIGS. 9-12 show the moveable disk 48 in detail. It may also be made of a ceramic material. In any event, it preferably has a pair of recesses 68 that are separated by a wall 70 on one of the faces 71 of the moveable disk 48. As can be seen from FIG. 12, the pair of recesses 68 have a concave geometry along a curved internal wall surface 94. As shown, the profile of the curved internal wall surface 94 is roughly cylindrical such that the curved internal wall surface 94 approaches the face 71 at points 96 and 98, but the concave surface reaches a maximum distance from the face 71 near a point 100. This contouring helps to minimize undesired forces and turbulence which might otherwise occur when the flow path of the water reverses itself.

[0066] Similar to the stationary disk 50, the pair of recesses 68 in the moveable disk 48 may be back-to-back d-shaped shapes in plan view.

[0067] At one rotational limit of the valve stem 12 the d-shaped profiles on the moveable disk 48 and the stationary disk 50 can be aligned. This orientation would be a closed position of the disk valve, as the partition walls 70 and 74 are aligned such that the inlet and outlet ports are not in fluid communication with one another.

[0068] After a 90 degree turn of the valve stem 12, the wall 70 would be at a right angle relative to the wall 74. This orientation would correspond to an open position of the disk valve, since the inlet and outlet ports would now be in fluid communication with one another.

[0069] There are many benefits of providing partitioned ceramic disks.

[0070] For one, the symmetry of the disks allows for their use in various valve applications without altering the geometry of the disks. For example, the moveable disk could be configured in one valve such that the clockwise rotation of the moveable disk opens the valve. However, in a different valve, the same moveable disk could be configured such that the counter-clockwise rotation of the moveable disk opens the valve. As described above, the assembly of these two valves might be similar except for the configuration of an adaptor disk. Thus, the use of partitioned disks can eliminate the need for separate production equipment for manufacturing disks for clockwise and counter-clockwise type applications.

[0071] Additionally, partitioned disks may reduce the contact area between the moveable disk 48 and the stationary disk 50. The reduced contact area decreases the amount of water deposit build up between the moveable disk 48 and the stationary disk 50 and, thus, reduces operating friction over time.

[0072] Further, the use of ceramic disks eliminates the valve drive shaft from exposure to various water chemistries. This eliminates many of the negative effects of water on valve operation by minimizing the number and types of valve components that the water contacts. This minimizes the likelihood of the water being exposed to a lead-containing component in the valve or corroding the valve parts.

[0073] It should be appreciated that in some forms, the particular geometry of the recesses 68 in the moveable disk 48 and the apertures 72 in the stationary disk 50 may be differently shaped. Referring now to FIGS. 5A and 9A, an alternative form of the stationary disk 48 and 50 are shown, with like features having like numbers as FIGS. 5 and 9, but with the addition of primes. Notably, the shape of the partitioned apertures 72 and recesses 68 have been altered along the contacting faces of the disks 48 and 50. In particular, the curved walls of the D-shape have been moved closer to the partition wall at each end, while the center portion of the curved wall extends away from the partition wall.

[0074] Changes to the geometry of the partitioned recesses and apertures allow for flexibility of the relationship between flow rate and angle of rotation. By tweaking the shape of the recesses and apertures, the flow rateangle relationship can be finely adjusted. In comparison to the double-D shaped partition in FIGS. 5 and 9, these disks 48 and 50 would reduce the initial flow rate upon rotation, giving more fine control over flow over the first ten to twenty degrees of movement.

[0075] Referring now to FIGS. 13 and 14, a bonnet nut 14 can have an outer hex fastening surface 102, a bore 104 having an inner surface 106 and a counterbore 108 having an inner surface 110. When referring to the surface of the bore with respect to the bonnet nut 14, the surface being referred to can include any portion, or all of, surfaces 106 and 110, as well as the perpendicular surfaces 112 and 114.

[0076] The bonnet nut 14 secures the valve cartridge 30 into the bore 32 in the valve housing 16. The bore 104 permits the valve stem 12 to extend out of the bonnet nut 14 such that the valve stem 12 may be turned and the counterbore 108 may permit the valve cartridge 30 to be held in the bore 32.

[0077] The bonnet nut 14 can have its internal bores designed to provide specific resistance to stem rotation when the stem rubs against it. For example, easy rotation can be achieved by coating the bonnet with a slip coating.

[0078] Alternative modifications may be made to the inner surfaces 106 and 110 of the bonnet nut 14. For example, referring to FIG. 16, flexible fingers 120 may be added to some or all of the inner surfaces 106, 110, 112, and 114 to rub the valve stem 12 as it is rotated. Such fingers 120 may be polymeric or elastomeric in nature. Likewise, the bonnet nut 14 may be composed of a particular material having an optimal frictional surface, such as, for example, a glass-filled polymer, such that frictional forces between the bonnet nut 14 and at least a portion of the valve stem 12 provides tactile resistance to the applied torque.

[0079] Other modifications may be provided to create a specific rotational feel. For example, referring to FIG. 17, it is contemplated that the shape of the bore 104 and counterbore 108 could be designed such that a pocket 122 of lubricant could be placed between the bonnet nut 14 and the valve stem 12. The lubricant used in the pocket 122 could be selected to have an appropriate viscosity and resistance to the forces applied during rotation that an appropriate amount of resistance is provided.

[0080] Likewise, referring to FIG. 18, a set of bearings 124 could be inserted between the bonnet nut 14 and the valve stem 12. The set of bearings 124 could be selected such that resistance is provided as the valve stem 12 is turned.

[0081] Many prior art valve assemblies have their valve cartridges held in place by clips or caps threaded on the exterior of the valve housing. In contrast, this valve assembly preferably places the interior of the valve housing 16. This opens up the possibility of recessing the nut partially or totally within the valve housing.

[0082] In FIG. 15 the valve is shown in the closed position. Recesses 86 and 88 extend up to ports 116 and 118. A lower valve seal 52 provides a water-tight seal between the surface of the bore 32 and the stationary disk 50.

[0083] While various embodiments have been described, it will be apparent to those skilled in the art that other changes can be made as well. Therefore, the present invention is not to be limited to just the described most preferred embodiment. Hence, to ascertain the full scope of the invention, the claims which follow should also be referenced.

INDUSTRIAL APPLICABILITY

[0084] The present invention provides an improved fluid control valve, particularly with respect to reducing contact between potable water and a leaded metal housing, simplifying connection of supply and outlet hoses, and supporting and optimizing stem movement.