Diaphragm valve

Abstract

A diaphragm valve (33) comprises: a diaphragm (201) movable in a range from a first position to a second position to open and close an outlet (41); a control discharge hole (205) extending from a first side (233a) of the diaphragm (201) to a second side (233b) opposite to the first side (233a); a closing member (401) movable to open and close the control discharge hole (205) to modify the pressure on either side of the diaphragm (201) to cause the diaphragm (201) to move in at least a portion of the range; and a mechanical tool (501) arranged to move the closing member (401) to open and close the control discharge hole (205), wherein the mechanical tool (501) is configured to engage the diaphragm (201) and cause the diaphragm (201) to move in at least a portion of the range.

Description

Technical Field

[0001] The present disclosure relates to a diaphragm valve. In particular, but not exclusively, the present disclosure relates to a diaphragm valve for use in a bath fitting. The present disclosure also relates to a bath fitting comprising a diaphragm valve. Background Art

[0002] Bath accessories such as showers typically include multiple outlet ports, each of which feeds a different outlet device. For example, a first outlet device may include an overhead showerhead, and a second outlet device may include a handheld unit.

[0003] Different types of diverter valves are known that allow one or more of the outlet devices to be selected at a time. In other examples, each outlet may contain a separate valve to control the flow of water to each device individually.

[0004] Opening and closing a valve controlling the flow of water generally requires overcoming water pressure, which in the case of a mains water supply can vary between 0.1 bar and 10 bar, with 3 bar being typical. The magnitude and direction of the force required to open the valve may reduce design freedom when placing the control tool in relation to the valve. Generally, the control tool must be positioned along a straight line from the actuator of the valve to allow the required force to be transmitted through a rigid connection mechanism.

[0005] It would be beneficial to alleviate or at least reduce one or more of the problems associated with the prior art. Summary of the invention

[0006] According to a first aspect of the present invention, there is provided a diaphragm valve, the diaphragm valve comprising: a diaphragm movable in a range from a first position to a second position to open and close an outlet; a control vent extending from a first side of the diaphragm to a second side opposite the first side; a closing member movable to open and close the control vent to modify the pressure on either side of the diaphragm, thereby causing the diaphragm to move in at least a portion of the range; and a mechanical tool arranged to move the closing member to open and close the control vent, wherein the mechanical tool is configured to engage the diaphragm and cause the diaphragm to move in at least a portion of the range. In an exemplary embodiment, the diaphragm valve can be closed when the diaphragm is in the first position, and the diaphragm valve can be opened when the diaphragm is in the second position.

[0007] The diaphragm valve can be actuated by a low force input (≤ 10 Newtons), thereby providing greater flexibility in the design and placement of user controls used to actuate the valve.

[0008] The mechanical tool may be arranged to engage the diaphragm after moving the closure member to open or close the control vent aperture.

[0009] Over at least a portion of this range, movement of the diaphragm may be driven by a combination of mechanical means and a pressure differential.

[0010] The control drain hole may be formed as a hole in the diaphragm. Alternatively, the hole may be formed centrally in the diaphragm.

[0011] The diaphragm valve may comprise an inlet and an outlet, the outlet being fluidly isolated from the inlet when the diaphragm is in the first position.Alternatively, the inlet and outlet may both be located on the first side of the diaphragm.

[0012] The diaphragm may include one or more additional drain holes extending through the diaphragm, the additional drain holes being separate from the control drain hole. Optionally, when the diaphragm is in the first position, the one or more additional drain holes may be in fluid communication with the inlet and isolated from the outlet fluid, such that a drain path is formed when the control drain hole is open. The drain path may extend from the inlet, through the additional drain holes to the second side of the diaphragm, and from the second side of the diaphragm through the control drain hole to the outlet.

[0013] The diaphragm valve may include anti-clogging means to prevent blockage from forming in the additional discharge hole.

[0014] When the diaphragm is in the second position, the inlet and the outlet may be in direct fluid communication, thereby providing a flow path from the inlet to the outlet.

[0015] The closure member may be biased to close the control drain aperture.

[0016] The mechanical means may comprise means for converting a push and / or pull force from the actuator mechanism into movement of the closure member.

[0017] The closing member may be arranged to move in a linear direction.The machine tool may optionally be arranged to convert rotation of the machine tool into linear movement of the closing member.

[0018] The machine tool may be arranged to convert linear movement of the actuator mechanism into rotation of the machine tool.

[0019] The machine tool may be arranged to rotate about an axis perpendicular to the linear direction.

[0020] The actuator mechanism may be arranged to convert an input force at the user control into movement of the actuator mechanism along its length.

[0021] Preferably, the machine tool may comprise: a rotatable elongated member having an axis extending perpendicular to a first linear direction; a first formation on the elongated member arranged to engage the actuator mechanism and arranged to convert linear movement of the actuator mechanism into rotation of the elongated member; and a second formation arranged to engage a closing member to convert rotation of the elongated member into linear movement of the closing member. The diaphragm may be arranged to move along a linear direction.

[0022] The actuator mechanism may include a cable or flexible tube coupled between the user control device and the machine tool, and a sheath at least partially surrounding and guiding the cable or flexible tube. The cable or flexible tube may be movable relative to the sheath in a direction along the length of the cable or flexible tube, and a push or pull force from either end of the cable or flexible tube is converted along the length of the cable or flexible tube.

[0023] The diaphragm valve may further comprise latching means arranged to maintain the diaphragm in the first position and / or the second position. Optionally, the latching means may be provided at one or more of the user control, the actuator mechanism, the mechanical means, the closure member or the diaphragm.

[0024] The diaphragm valve may comprise a housing defining a volume at least partially housing the diaphragm, the closure member and the mechanical tool.The use of a separate housing enclosing only components of the diaphragm valve allows the diaphragm valve to be provided as a modular component for inclusion in a larger system.

[0025] The housing may define a seat defining the first position and / or the second position of the diaphragm.

[0026] The diaphragm may close the volume to form a closed space on the second side of the diaphragm. Optionally, the exhaust path passes through the closed space.

[0027] The diaphragm valve may include a retaining ring to at least partially retain the diaphragm within the chamber and at least partially define the first position and / or the second position of the diaphragm.

[0028] The elongated member of the machine tool may extend through the housing. Optionally, the first configuration of the machine tool may be located outside the housing. Further optionally, the second configuration of the machine tool may be located inside the housing.

[0029] According to a second aspect of the present invention, a bath accessory is provided, comprising: a main body; one or more inlets; and one or more outlets, at least one of the one or more outlets having a diaphragm valve according to the first aspect, the diaphragm valve being arranged to open and close the outlet.

[0030] By using the low force diaphragm valve of the first aspect in a bath fitting, the bath fitting may utilise a low force user control and have greater freedom in where to place and in the design of the user control for actuating one or more valves.

[0031] The bath fitting may comprise two or more inlets; a mixer box received in the body and arranged to mix water from the two or more inlets, the mixer box being positionable between the inlets and the one or more outlets.

[0032] The body may include an internal structure that defines an inlet of the diaphragm valve and an outlet of the diaphragm valve.

[0033] Bath accessories can have many outlets connected to different devices. Each outlet can be opened and closed by any one of the diaphragm valves.

[0034] It should be appreciated that features discussed in relation to any particular aspect may, where appropriate, be applied to any other aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings, in which:

[0036] Figure 1A The shower fitting is schematically shown in cross-section;

[0037] Figure 1B Perpendicular to Figure 1A The cross-sectional view of the view schematically shows Figure 1A Shower accessories;

[0038] Figure 2A The exploded diagram shows the Figure 1A Diaphragm valve modules for shower accessories;

[0039] Figure 2B Shown in cross-section Figure 2A A diaphragm valve module, wherein the diaphragm is in a first position;

[0040] Figure 2C Perpendicular to Figure 2B The cross-sectional view shows Figure 2A a diaphragm valve module, wherein the diaphragm is in a second position;

[0041] Figure 2D The cross-sectional view shows the Figure 1A Accessories Figure 2A A diaphragm valve module, wherein the diaphragm is in a first position;

[0042] Figure 3The diaphragm of the diaphragm valve module is shown;

[0043] Figure 4A Shows the control Figure 2A An exemplary actuator mechanism of a diaphragm valve module;

[0044] Figure 4B Shown in more detail Figure 4A an actuator member; and

[0045] Figure 4C shows the Figure 4A The force of the actuator mechanism is transferred to Figure 2A A connecting component of a diaphragm valve module. DETAILED DESCRIPTION

[0046] Figure 1A and Figure 1B An example of a mixer shower fitting 1 is shown, which serves as an example for illustrating various embodiments. Figure 1A and Figure 1B The fitting 1 is shown in a cross-sectional view. Figure 1A and Figure 1B The two views are taken at 90 degrees to each other.

[0047] The shower fitting 1 has a generally cylindrical body 3 formed by a cylindrical shell defining a longitudinal axis XX. The body 3 is fixed to a mounting plate 5 which in turn is mounted to a wall or other supporting surface (not shown). Thus, in use, the axis XX protrudes from the wall or surface. A cover trim 45 is then mounted on the body 3 and the plate 5. The cover trim 45 may be fixed to the plate 5 and / or the body 3 by mutually engaging projections, screws or any other suitable connection means (not shown).

[0048] In the following, reference will be made to the top / front and bottom / rear of the accessory 1 and to the various components of the accessory 1. These terms are defined along the axis XX with respect to the plate 5. Thus, the "bottom", "base" or "rear" of an element is the end closest to the plate 5, while the "top" or "front" is the opposite end spaced from the plate 5. The directions upward / downward and forward / rearward will also be defined along this axis XX, with upward / forward being away from the plate 5 along the axis XX and downward / rearward being towards the plate 5 along the axis XX.

[0049] In one example, the body 3 is secured to the mounting plate 5 by screws 7, however it will be appreciated that this is by way of example only and a person skilled in the art will appreciate various mechanisms for securing the body 3 to the plate 5. For example, any suitable mechanical fittings may be used, or interengaging protrusions may be used.

[0050] like Figure 1AAs shown in , the body 3 and the plate 5 define a pair of inlets 9a, 9b for connection to a water supply pipe (not shown). In this example, the first inlet 9a is arranged to be connected to a hot water supply and the second inlet 9b is connected to a cold water supply.

[0051] Each of the body inlets 9a, 9b is coupled to a respective inlet channel 13a, 13b defined in the housing, which in turn has an opening 15a, 15b into an inner chamber 11 defined in the housing. The inlet channels 13a, 13b extend along an axis XX.

[0052] The chamber 11 defines an open space within the body 3. A thermostatic mixer cartridge 19 is housed in the chamber 11 to mix hot and cold water. The cartridge 19 interacts with the body 3 to divide the chamber 11 into a number of subsections and has hot and cold inlets (not shown) axially aligned with the respective chamber openings 15a, 15b to receive water from the body inlets 9a, 9b.

[0053] The thermostatic mixer box 19 extends along the axis XX and has at its base a single outlet 21 for the mixed water. The body 3 defines an outlet chamber 23 into which the outlet 21 opens. A control 25 is provided to control the mixing of the water, thereby varying the temperature at the outlet 21 .

[0054] The chamber openings 15a, 15b are controlled by check valves 17a, 17b, which are biased to close the chamber openings 15a, 15b. Under sufficient water pressure, the check valves 17a, 17b open to allow the passage of water into the box 19, through the sub-portion of the chamber 11. In one example, the check valves 17a, 17b can open at a pressure of 0.025 bar or more.

[0055] The check valves 17a, 17b, the thermostatic mixer box 19 and the controls 25 are known in the art.

[0056] As in Figure 1B As best shown in FIG. 1 , the body 3 defines a pair of outlet openings 27a, 27b. Each outlet opening 27a, 27b provides mixed water from the mixer box 19 and can be connected to a different output device (not shown). For example, the first outlet 27a can be connected to an overhead spray head and the second outlet 27b can be connected to a handheld unit.

[0057] Each outlet opening 27 a , 27 b is connected to the outlet chamber 23 by a respective outlet channel 29 a , 29 b defined in the housing 3 .

[0058] The outlet channels 29a, 29b extend parallel to the axis XX, the water flowing in a direction away from the base 5. Thus, the outlet openings 27a, 27b are arranged on the side of the body 3.

[0059] A valve chamber 31a, 31b is formed in each outlet channel 29a, 29b. The valve chamber 31a, 31b accommodates a corresponding diaphragm valve module 33a, 33b (also referred to herein as a valve) to control the flow to the outlet 27a, 27b. Figure 1B , for illustration purposes, the first valve module 33a is shown in cross-section (on the right-hand side of the figure).

[0060] User controls 35a, 35b formed in the trim 45 are provided to control the valve modules 33a, 33b. Actuation of the user controls 35a, 35b causes actuation of the diaphragm valve modules 33a, 33b to control the flow of water from the outlets 27a, 27b.

[0061] The diaphragm valve modules 33a, 33b and user controls 35a, 35b will be discussed in more detail below.

[0062] like Figure 1A and Figure 1B As shown, water enters the body 3 through the inlets 9a, 9b and flows in a forward direction through the inlet channels 13a, 13b. It then enters the thermostatic mixer box 19 and flows backward through the box 19. At the valve modules 33a, 33b, the flow turns 180 degrees again and flows forward through the outlet channels 29a, 29b to the outlets 27a, 27b.

[0063] Now refer to Figure 2A , Figure 2B , Figure 2C , Figure 2D and Figure 3 The diaphragm valve module 33 is discussed in more detail.

[0064] Figure 2A The components of the diaphragm valve module 33 are shown in an exploded view, and Figure 2B and Figure 2C The assembled diaphragm module 33 is shown in cross-section with the diaphragms in different positions. Figure 2B and Figure 2C The views in are taken perpendicular to each other. Figure 2D The diaphragm module 33 is shown installed in the assembly 1 as discussed above, with the diaphragm 201 in contact with the Figure 2B Same location. It will be appreciated that the two diaphragm valve modules 33a, 33b are identical in construction and therefore only one will be described below.

[0065] The diaphragm valve module 33 includes a housing 101 having a base 103 and a generally cylindrical sidewall 105 extending upwardly from the base 103. The base 103 and the sidewall 105 together define an inner volume 107 of the housing 101.

[0066] Within volume 107 , an annular lip 109 is formed facing upwardly midway along side wall 105 .

[0067] An annular protrusion 113 is formed extending upwardly from the base 103 of the housing 101, wherein a circular void is formed in the annular protrusion 113. The annular protrusion 113 extends forwardly within the volume 107, below the height of the side wall 105. A first pair of slots 115 are formed at diametrically opposed locations on the housing. A second pair of slots (not shown) formed at diametrically opposed locations is also provided, the second pair of slots being offset 90 degrees from the first pair 115 about the axial direction XX. Figure 2C The cross-section is perpendicular to Figure 2B The narrow slot 115 shown in FIG.

[0068] A second annular lip 117 is formed at the top of the side wall 105 of the housing 101 .

[0069] The diaphragm 201 is partially housed in the volume 107 formed by the housing 101 . Figure 3 The diaphragm 201 is shown in more detail.

[0070] In the current example, the diaphragm 201 is formed of a rubber material. For example, the diaphragm may be EPDM or any other suitable rubber material. Alternatively, the diaphragm 201 may be silicone or any other suitable elastic and resilient material.

[0071] The diaphragm 201 has a front engagement surface 203. The front engagement surface 203 is flat and circular and defines an axial direction of the diaphragm, which extends perpendicularly to the engagement surface 203. In the assembled diaphragm valve module 33, the axial direction of the diaphragm is parallel to the axial direction XX of the fitting 1.

[0072] A central cavity 205 is formed in the engagement surface 203 , and a pair of outer cavities 207 a , 207 b are formed at diametrically opposed positions, radially outward of the central cavity 205 .

[0073] The cylindrical side wall 209 extends rearwardly in the axial direction from an outer edge 211 of the engagement surface 203. At the bottom of the side wall 209, opposite the engagement surface 203, an enlarged retaining lip 213 is formed.

[0074] The retaining lip 213 is formed by a projection 215 extending forwardly parallel to the side wall 209 and radially spaced outside the side wall 209. The projection 215 is connected to the side wall 209 by a connecting portion 217. The projection 215, the side wall 209 and the connecting portion 217 thus define a slot 219, such as Figure 3 as shown in .

[0075] The diaphragm 201 is also coupled to a carrier member 221. The carrier member 221 is formed of a rigid plastic material. For example, the carrier member may be polyphthalamide. The carrier member 221 is overmolded onto the diaphragm 201 to form a sealed connection with the diaphragm 201. Where overmolding is used, the materials of the diaphragm 201 and the carrier member 221 should be compatible therewith.

[0076] The use of overmolding is by way of example only, and the carrier member 221 and diaphragm 201 may be coupled in any manner such that the diaphragm 201 always moves with the carrier member 221 and forms a sealed connection with the diaphragm 201. For example, the carrier member 221 may be secured to the diaphragm by an adhesive and / or a mechanical connection rather than overmolding.

[0077] The carrier member 221 has a protrusion 223. The protrusion has a generally cylindrical portion 223c protruding in front of the diaphragm 201, an enlarged portion 223a received in the central hole 205 of the diaphragm 201, and a bell-mouth portion 223b received below the diaphragm 201. A central discharge hole 227 extending through the protrusion 223 is formed.

[0078] An annular disk 225 is formed extending from the flared base 223b of the protrusion 223. The disk 225 is located below the engagement surface 203 of the diaphragm 201 to support the engagement surface 203.

[0079] An annular wall protrusion 237 extends downwardly from an underside 239 of the disk 225. The wall protrusion 237 is radially spaced between the protrusion 223 and the outer edge 231 of the disk 225.

[0080] like Figure 2B and Figure 2D , an enlarged rim 241 is formed at the base of the wall protrusion 237, the enlarged rim 241 extending radially outward from the wall 237. The enlarged rim 241 forms a ledge 243 on the radially outer surface of the wall protrusion 237. It will be understood that the enlarged rim 241 and ledge 243 can extend around the entire perimeter of the wall 237, or can extend around a portion of the perimeter in one or more separate sections.

[0081] As in Figure 2CAs best shown in FIG. 2 , the carrier member 221 includes apertures 229 that align with the outer apertures 207a, 207b in the diaphragm.

[0082] In the assembled diaphragm valve module 33, the diaphragm 201 is retained relative to the housing 101 by the engagement of a retaining ring 301. The retaining ring 301 is an annular ring that engages with a protrusion 303 (threaded in one example, but not necessarily the case) at the top of the sidewall 105 of the housing 101.

[0083] As in Figure 2C As best shown in FIG. 1 , the retaining lip 213 of the diaphragm 201 is secured between the second annular lip 117 at the top of the housing sidewall 105 and the retaining ring 301. The retaining ring includes downward projections 305a, 305b that extend downward to form the ring 301. The projections 305a, 305b are annular and extend on the weak (either) side of the second annular lip 117 at the top of the housing sidewall 105 and the retaining lip 213 of the diaphragm 201. The retaining ring 301 diametrically compresses the retaining lip 213 of the diaphragm 201 to form a seal between the diaphragm 201 and the housing 101 so that no water can flow around the diaphragm 201 (i.e., the only flow path is through the drain hole 207).

[0084] The diaphragm 201 is capable of deformation or movement such that the engagement surface 203 can be considered to move within a range between two extreme positions, such as Figure 2B and Figure 2C as shown in .

[0085] exist Figure 2B and Figure 2D In the first position shown in FIG. 1 , the diaphragm 201 extends forwardly out of the housing 101 such that a majority of the side wall 209 of the diaphragm 201 is located outside of the housing volume 107. The underside of the carrier member 221 is spaced from the top of the annular protrusion 113 formed at the front of the housing 105, and the diaphragm 201 is spaced from the first lip 109 in the housing 205.

[0086] exist Figure 2C In the second position shown in FIG, the side wall 209 of the diaphragm 201 is mainly contained in the volume 107 defined by the module housing 101. The connecting portion 217 of the diaphragm 201 has been axially moved toward the first lip 109 in the housing 101, and the underside of the carrier member 221 rests on the top of the annular protrusion 113.

[0087] In order to move the diaphragm 201 between the two positions discussed above, the central vent hole 227 in the carrier 221 can be opened and closed. Opening and closing the vent hole 227 opens and closes the vent path, which in turn changes the dynamic pressure on the opposite sides 233a, 233b of the diaphragm 201, as will be discussed in more detail below. Therefore, the central vent hole 227 can be considered a control vent hole.

[0088] When open, the drain path extends from the first (top) side 233a of the diaphragm 201, through the outer drain hole 207 to the second (bottom) side 233b, into the chamber 235 defined between the diaphragm 201 and the housing 101. Water then flows from the chamber 235 through the central opening 227 in the carrier 221. It will be seen that when the diaphragm 201 is in the first position, the chamber 107 is larger than when the diaphragm 201 is in the second position.

[0089] In order to open and close the central discharge hole 227, a closing member 401 is provided. The closing member 401 is formed of two parts, an outer shield 401a and a central sleeve 401b.

[0090] The outer shield 401a has a hollow cylindrical portion 403 which is accommodated in a space defined by an annular protrusion 113 extending from the base 103 of the housing 101. The cylindrical portion 403 of the outer shield 401 has a partially closed top 409 in which a central opening 409a is formed.

[0091] An annular rim 413 is formed radially outside the cylindrical portion 403. The annular rim 413 is connected by a support structure 415. Figure 2C As shown in FIG. 4 , the support structure 415 may extend from the top of the cylindrical portion 403, with the rim 413 being slightly lower. Thus, the support structure defines a downwardly facing recess that may seat on top of the annular protrusion 113 when in the second position.

[0092] An enlarged protrusion 419 is formed at the top of the annular rim 403, and a ledge 421 is formed on the radially inner side of the rim 413. It will be appreciated that the enlarged protrusion 419 and ledge 421 may extend around the entire perimeter of the rim 403, or may extend around a portion of the perimeter in one or more separate segments, circumferentially aligned with the ledge 241 on the carrier member 221.

[0093] At diametrically opposed locations, pin formations 417 extend upwardly from the annular rim 403. The pin formations 417 are positioned to align with the outer holes 407 in the diaphragm 201. In the first position ( Figure 2B), the pin formation 417 partially extends into the hole 229 formed in the carrier 221. In the second position, the pin formation 417 extends into the hole 229 in the carrier member 221 and the outer hole 207 in the diaphragm 201. The diameter of the pin formation 417 is smaller than the diameter of the hole 229 in the carrier 221 so that an annular space is always formed around the outside of the pin formation 417 and the hole 229 is never completely closed.

[0094] The central sleeve 401b also includes a hollow cylindrical portion 407. The hollow cylindrical portion 407 of the central sleeve 401b is sized to fit within the cylindrical portion 403 of the outer shroud 401a, forming a tight fit.

[0095] The central sleeve has a closed top 407a and a cylindrical closed protrusion 407b extending upward from the closed top 407a. The closed protrusion 407b extends forward through the central opening 409a in the cylindrical portion 403 of the outer shield 401a, while the cylindrical portion 407 of the sleeve member 401b is retained by the partially closed top 409 of the outer shield 401a.

[0096] The closing projection 407b is capable of closing the central discharge aperture 227. To form a sealed closure, the sleeve member 401 is formed of rubber, silicone or some other resilient and elastic material. On the other hand, the outer shield member 401a is formed of a rigid plastic.

[0097] In this example, the outer shield member 401a and the central sleeve 401b are formed as two separate parts, which are connected by the tight fit of the sleeve 401b inside the shield 401a and by the partially closed top 409 of the shield member 401a. However, this may not necessarily be the case. The two parts can be joined by an adhesive or other suitable means, and they can be made as a single integral member or more than two parts made of a single material or multiple materials and joined in any suitable manner.

[0098] The spring 411 is housed in the central volume 405 of the closure member body 403 and is guided within the annular projection 113. The spring 411 engages the inside of the closure top 407a of the sleeve member 401b and the base 103 of the housing 101 to bias the closure member 401 to a position in which the central discharge aperture 227 is closed by the closure projection 407.

[0099] The closing member 403 is movable against the bias of the spring 409 to open the central vent hole 227. The diaphragm valve module 33 incorporates a mechanical mechanism 501 for converting a user input from one of the control devices 35a, 35b into movement of the closing member 401.

[0100] The mechanism 501 comprises an elongate member 503 arranged to rotate about its own axis. The elongate member 503 extends through an opening 119 formed in the housing 101 so that its axis extends perpendicularly to the direction of movement of the closure member 401 (and therefore perpendicularly to the diaphragm 201). An O-ring 503a ensures a tight seal between the elongate member 503 and the housing 101 while allowing the elongate member 503 to rotate freely.

[0101] Inside housing 101, at a first end of elongate member 503, a first formation, in this case a fork member 505, is formed on the end of elongate member 503. Fork member 505 has a pair of spaced apart projections 505a extending radially from elongate member 503, each projection having a downwardly facing surface 505b.

[0102] The downwardly facing surface 505b of the fork projection 505a engages the top of the lug 421 extending from the cylindrical portion 403 of the outer shroud 401a of the closure member 401. The lugs 421 are formed at diametrically opposed locations extending radially outward through the first pair of slots 115 in the annular projection 113. The first pair of slots are formed along an axis extending parallel to the elongated member 503 in the assembled module 33.

[0103] A second configuration is formed at a second end of the elongated member 503 opposite the first end, in this case, a paddle member 507. The paddle member 507 has a surface 507b extending from the elongated member 503. The surface 507b is radial or tangential to the elongated member 503. In the example shown, the paddle surface 507b extends generally from the opposite side of the elongated member to the fork protrusion 505a. In other examples, the relative angle between the paddle surface 507b and the fork protrusion 505a can vary to allow for variations in the placement of the actuator mechanism that applies force on the paddle member 507.

[0104] The arrangement of paddle member 507 and fork member 505 allows any push or pull force on paddle member 50 to be converted into rotation of elongate member 503 which in turn is converted into rotation of fork 505 which engages lug 421 and causes linear movement of carrier member 401 .

[0105] Rotation of the elongated member 503 in a first direction causes rotation of the fork 505 in the same direction, thereby applying a force to the carrier member 401 against the spring 411. Rotation in the opposite direction releases the force to allow the spring 411 to return the closure member to its biased position. Figure 2BStarting from the middle position (closed), the pulling force on the paddle surface 507b (i.e., pushing the paddle 507 upward) will cause the extension member 303 to rotate clockwise, thereby lowering the fork protrusion 505a to open the diaphragm valve 33, and the pushing force on the paddle surface 507b causes counterclockwise rotation, thereby causing the fork protrusion 505b to lift and close the valve 33.

[0106] In one example, the opening 119 through which the elongated member 503 passes into the housing has an open base to facilitate installation of the elongated member 503. The elongated member 503 is held in place in the housing 101 by a retaining member 509 that closes the base of the opening 119. The retaining member 509 can be secured to the housing 105 or the elongated member 503 by a friction fit or a clamp fit, and can form a seat to hold an O-ring 503a. In other examples, a simple through hole can be used.

[0107] Fork member 505 and paddle member 507 are formed separately from elongated member 503 and are coupled to elongated member 503 by engaging protrusions 511 so that the connection is rigid. In the example shown, the end of elongated member 503 is formed with ridges 511 extending parallel to the length of the elongated member, with a number of ridges arranged around the perimeter. Each of fork member 505 and paddle member 507 has a sleeve arranged to fit the end of elongated member 503, with corresponding protrusions 511 engaging ridges 511.

[0108] It will be appreciated that the engagement of fork member 505 and paddle member 507 with elongated member 503 is by way of example only, and any suitable mating mechanism may be used, or fork member 505 and / or paddle member 507 may be integrally formed with elongated member 503. Furthermore, fork member 505 and paddle member 507 are merely examples of configurations that may be used. Any suitable configuration that can transmit force in an appropriate manner may be used.

[0109] By using the mechanical mechanism 501 discussed above, the actuation action is introduced from the side of the diaphragm 201 (rather than in a linear direction along the same axis as the closure member 401 and diaphragm 201 move). The use of rotation allows a low force to be transmitted to open and close the valve, and the required force remains approximately constant regardless of the water pressure from the supply. In addition, placing the actuation from the side allows the placement and design of the user control device 35a, 35b and the mechanism for transmitting input from the user control device 35a, 35b to the valve 33a, 33b to be varied.

[0110] A retaining nut 605 is provided on top of the valve module 33 to retain the components relative to each other (and optionally, if desired, to help form a sealed connection between the diaphragm 201 and the carrier component 221). The retaining nut 605 is arranged around the outside of the cylindrical protrusion 223 of the carrier member 221, and the nut 605 and the cylindrical protrusion 223 have an engaging formation 607 to secure the nut 605 in place. The formation 607 provides a guide to keep the diaphragm centered and square, resisting side loads applied by the water flow.

[0111] Retaining nut 605 includes a central passage 607 .

[0112] In use, diaphragm modules 33a, 33b are provided in valve chambers 31a, 31b. An O-ring 601 is provided in a seat 603 formed in an outer part of housing 101 to seal around module 33 between module 33 and fitting housing 3a. Engaging surface 203 of diaphragm 201 is perpendicular to axial direction XX.

[0113] The housing 101 includes an annular inner wall or formation 37 that defines a mouth 39 leading to the respective outlet passages 29a, 29b. The size of the mouth 39 is defined so that the central discharge hole 227 is located radially inside the mouth 39 and the outer discharge holes 207 are located radially outside the mouth 39. The space radially outside the mouth 39 is in fluid communication with the outlet chamber 23 from the thermostatic box 19. Thus, the mouth 39 defines the outlet 41 of the valve module 33 radially inside the inlet 43 of the valve module 33.

[0114] Initially, the diaphragm 201 is in the first position, such as Figure 2B and Figure 2D As shown in:

[0115] - the engagement surface 203 sealingly engages the mouth portion 39, closing the valve inlet 43 from the valve outlet 41;

[0116] The outer shield 401b of the closing member 401 bears against the underside 239 of the diaphragm carrier 221

[0117] (at edge 413) and spaced apart from the top of annular projection 113;

[0118] - a pin formation 417 extends through a hole 229 in the carrier member 221 and into an outer hole 207 in the diaphragm 201; and

[0119] The ledge 243 on the wall protrusion 237 of the carrier member 221 is linearly spaced apart from the ledge 419 on the rim 413 of the closure member 401 in the axial direction.

[0120] In this position, the closure member 407b sealingly engages the underside of the cylindrical protrusion 223 to close the central discharge aperture 227. Thus, there is no fluid communication between the inlet 43 and the outlet 41 of the valve 33.

[0121] A mechanical force may then be applied to the closing member to move it downwardly, against the bias of the spring 411 .

[0122] Initially, the diaphragm 201 does not move, but the closure member 401 moves downward. After the closure member 401 has moved downward a first distance, the central vent hole 227 has opened. At this stage, the only fluid communication path through the valve 33 is the vent path, from the inlet 43 through the outer vent holes 207, then through the central vent hole 227 to the outlet 41. This reduces the pressure below the diaphragm 201 and increases the pressure above it.

[0123] After the closure member 401 has moved downwardly a first distance, the ledge 243 on the carrier member 221 then engages with the ledge 419 on the closure member 401. However, the underside 239 of the carrier member 221 has not yet engaged with the annular protrusion 113, and therefore, there is still travel for the closure member 401 to move.

[0124] Due to the engagement of the ledges 243, 419, the diaphragm 201 and the carrier member 221 move together with the closing member 401 as a single unit. Therefore, further movement of the closing member 401 does not change the position of the closing protrusion 417 relative to the diaphragm 221 and the carrier member. Instead, further movement of the closing member 401 applies a mechanical force to the diaphragm 201, thereby moving the diaphragm 201 until it reaches the second position. This further increases the pressure above the diaphragm 201.

[0125] Thus, the diaphragm 201 is moved by a combination of the water pressure difference caused by opening the discharge path and the mechanical force applied by the closing member 401 .

[0126] In the second position, if Figure 2C As shown in:

[0127] - the engagement surface 203 is spaced apart from the mouth 39 so that the valve inlet 43 is in fluid communication with the valve outlet 41;

[0128] - The outer shield 401b of the closure member 401 is spaced from the underside 239 of the carrier member 221 and abuts against the top of the annular protrusion 113 (before connecting the rim 413 to the central

[0129] The cylindrical portion 403 has a support structure 415 );

[0130] - The pin formation 417 partially extends into the hole 229 formed in the carrier 221, but

[0131] does not reach the outer hole 207 in the diaphragm 201; and

[0132] The ledge 243 on the wall protrusion 237 of the carrier member 221 abuts against the ledge 419 on the rim 413 of the closure member 401 .

[0133] In this position, the central drain hole 227 is also still open, thereby opening the drain path.

[0134] Releasing the force that holds the closure member 401 against the bias of the spring 411 causes the spring 411 to push the closure member 401 upward.

[0135] Over a first distance, the closing member 401 moves on its own, as the ledges 243, 419 are able to move away from each other in an upward direction. After the closing member has moved this first distance, the closing projection 407b closes the central discharge aperture 227, and the closing member 401 abuts against the underside of the carrier member 221. However, the diaphragm 201 is not engaged with the mouth 39, and still has further travel, so after this first distance, the diaphragm 201 and the closing member 401 move again as a single unit, so that the diaphragm 201 is now moved by a combination of the water pressure difference caused by the closed discharge path and the mechanical force applied by the spring 411. As a result, the diaphragm 201 returns to the first position, isolating the valve inlet 43 from the valve outlet 41.

[0136] By the mechanism discussed above, the central discharge hole 227 and the valves 33a, 33b are opened and closed. In addition, the movement of the pin structure 417 relative to the diaphragm 201 and the carrier member 221 ensures that any blockage that may form in the outer hole 207 is kept clear. Therefore, the pin structure can be considered as an anti-blocking mechanism.

[0137] Figure 4A and Figure 4B An example of an actuator mechanism 701 for transmitting force from a user control device 35 to a paddle 507 of a mechanical mechanism 501 is schematically shown. By using the diaphragm valve 33 discussed above, a low force input may be used. In some cases, an input force of only 5 Newtons to 6 Newtons may be required to open the valve 33.

[0138] In this example, the actuator mechanism 701 extends a flexible elongated member 703 that extends between the control 35 and the paddle 507. The use of the flexible member 703 allows the control to be freely placed with respect to the valve module 33 because the elongated member 703 can follow a non-linear path.

[0139] like Figure 4B, which shows a cross section taken through a flexible elongated member 703 comprising an outer sheath 705 and an inner cable or tube 707. The outer sheath 705 is rigidly fixed to the support structure of the accessory 1, thereby allowing the inner member 707 to move in a direction along its length. The first end of the inner member 707 is fixed to the control 35, and the second end is rigidly fixed to the paddle. Thus, movement of the inner member 707 caused by actuation of the control 35 actuates the paddle 507.

[0140] In one example, the user control may be a button, but any suitable control may be used.

[0141] It will be appreciated that in order for the diaphragm valve 33 to remain open it is necessary to maintain the force on the closure member 401 against the spring 411. This may be achieved by latching any one or more of the user control 35, cable 707 or mechanical mechanism 501. Suitable latching mechanisms are known in the art.

[0142] In the examples discussed above, the inner member 707 of the actuator mechanism is fixed directly to the paddle member 507. This need not be the case, and a link member 801 may be provided between the inner member 707 and the paddle member 507. In one example, such as in Figure 4C As shown in FIG. 8 , link member 801 may be arranged as a lever. Inner member 707 of elongated member 703 is connected to first end 803a of lever 801 , and second end 803b of lever 801 is arranged to push upwards and / or downwards on paddle 507 .

[0143] The pivot point 805 of the lever 801 may be moved to help apply a lever effect so that a low force input from a user may be incrementally raised to operate the valve 33. It will be appreciated that the pivot 805 and lever 801 may remain in a suitable configuration provided in the plate 5 or on the housing 3.

[0144] It will be understood that the embodiments discussed above are given by way of example only.

[0145] For example, various mechanisms may be provided to use mechanical forces in conjunction with pressure differentials to induce movement of the diaphragm 201 over at least a portion of its range.

[0146] In the examples discussed above, the retaining lip 213 of the diaphragm remains stationary while the central portion of the diaphragm 201 moves with the reinforcement from the carrier. It will be appreciated that in other embodiments, the entire diaphragm 201 may move and / or deform in any suitable manner to open and close the valve.

[0147] The diaphragm 201 given above is by way of example only. Any suitable shape and arrangement of the diaphragm 201 may be used. The central hole 227 in the diaphragm 201 or carrier member 221 may be replaced by a number of individual holes. Similarly, the portion of the flow path provided by the additional holes 207 may be provided by holes of any number and size to provide a discharge path.

[0148] Alternatively, at least part of the drain path may be provided by a channel formed in the housing 101 rather than by an aperture in the membrane 201. This may be part of the drain path formed by the central aperture 227 or the outer aperture 207.

[0149] In the examples discussed above, the diaphragm 201 is biased to close the valve. This is by way of example, and the diaphragm 201 can be biased to open the valve. Regardless of whether the diaphragm 201 is biased to open or close the valve, any suitable biasing means can be used instead of a spring.

[0150] The configuration of the housing 101 for housing the diaphragm module 33 and the protrusion 113 for guiding the movement of the closure member are provided by way of example only, and any suitable configuration may be used.

[0151] In one example, the diaphragm valve 33 may be integrally formed with the fitting 1 rather than provided as a separate module.

[0152] The valve module 33 may be used with any type of user control 35a, 35b and with any type of actuator mechanism 701 for connecting the user control 35a, 35b to the valve module 33a, 33b. Similarly, any suitable mechanical mechanism may be used to drive movement of the closure member 401.

[0153] It will be appreciated that the actuator mechanism 701 discussed above is given by way of example only, and any suitable mechanism may be used. For example, any suitable inner member 707 or sheath 705 may be used. In the example discussed above, the inner member 707 is completely enclosed within the sheath 705, but this need not be the case, and the sheath 705 may simply guide the inner member 707 as desired. In some example, a rigid connection may be provided between the user controls 35a, 35b and the paddle member 507 rather than the flexible member discussed above.

[0154] It will also be appreciated that the arrangement of the fitting 1 is given by way of example only. The inlet and outlet of the membrane module 33 may be located on either side of the membrane 201 , and may be located on the same side of the membrane 201 or on opposite sides.

[0155] Although the above embodiments have been described with respect to a shower having an overhead spray head and a handheld unit, the valve may be used in any bathing accessory having one or more inlets and one or more outlet devices. Not all outlet devices must be controlled by the same type of valve. Any type of mixer box may be used, and in some embodiments, the mixer may be omitted entirely.

Claims

1. A diaphragm valve, comprising: a diaphragm movable between a first position and a second position to open and close the outlet; a control vent extending from a first side of the diaphragm to a second side opposite the first side; a closure member movable to open and close the control vent to modify the pressure on either side of the diaphragm to cause the diaphragm to move through at least a portion of the range; as well as a mechanical tool arranged to move the closure member to open and close the control drain aperture, wherein the mechanical tool is configured to engage the diaphragm and cause the diaphragm to move through at least a portion of the range, The machine tool includes an elongated member having an axis extending perpendicularly to a direction of movement of the closing member and being rotatable about the axis.

2. The diaphragm valve according to claim 1, wherein: The mechanical tool is arranged to engage the diaphragm after moving the closure member to open or close the control vent aperture.

3. The diaphragm valve according to claim 1 or claim 2, wherein: Over at least a portion of the range, movement of the diaphragm is driven by a combination of the mechanical tool and a pressure differential.

4. The diaphragm valve according to claim 1, wherein: The control vent is formed as a hole in the diaphragm.

5. The diaphragm valve according to claim 4, wherein: The cavity is formed centrally in the diaphragm.

6. The diaphragm valve of claim 1, comprising an inlet and an outlet, the outlet being fluidly isolated from the inlet when the diaphragm is in the first position, wherein: The inlet and the outlet are both located on the first side of the diaphragm.

7. The diaphragm valve according to claim 6, wherein: The diaphragm includes one or more additional drain holes extending through the diaphragm, separate from the control drain hole, and when the diaphragm is in the first position, the one or more additional drain holes are in fluid communication with the inlet and isolated from the outlet fluid, so that when the control drain hole is open, a drain path is formed, extending from the inlet, through the additional drain holes to the second side of the diaphragm, and from the second side of the diaphragm through the control drain hole to the outlet.

8. The diaphragm valve of claim 7, comprising anti-clogging means to prevent a blockage from forming in said additional drain hole.

9. The diaphragm valve according to any one of claims 6 to 8, wherein: When the diaphragm is in the second position, the inlet and the outlet are in direct fluid communication, thereby providing a flow path from the inlet to the outlet.

10. The diaphragm valve according to claim 1 or claim 2, wherein: The closure member is biased to close the control drain aperture.

11. The diaphragm valve according to claim 1, wherein: The machine tool comprises: Means for converting pushing and / or pulling forces from the actuator mechanism into movement of said closure member.

12. The diaphragm valve according to claim 11, wherein: The closing member is arranged to move in a linear direction and wherein the machine tool is arranged to convert a rotation of the machine tool into a linear movement of the closing member.

13. The diaphragm valve according to claim 11 or claim 12, wherein: The machine tool is arranged to convert linear movement of the actuator mechanism into rotation of the machine tool.

14. The diaphragm valve according to claim 13, wherein: The machine tool is arranged to rotate about an axis perpendicular to the linear direction.

15. The diaphragm valve according to claim 11, wherein: The actuator mechanism is arranged to convert an input force at a user control into movement of the actuator mechanism along its length.

16. The diaphragm valve according to claim 11, wherein: The machine tool further comprises: a first formation on the elongate member, the first formation being arranged to engage the actuator mechanism and being arranged to convert linear movement of the actuator mechanism into rotation of the elongate member; as well as A second configuration is arranged to engage the closure member to convert rotation of the elongate member into linear movement of the closure member.

17. The diaphragm valve according to claim 15, wherein: The actuator mechanism comprises: a cable or flexible tube coupled between the user control and the machine tool; as well as a sheath at least partially surrounding and guiding the cable or flexible tube, wherein the cable or flexible tube is movable relative to the sheath in a direction along the length of the cable or flexible tube, and a push or pull force from either end of the cable or flexible tube is converted along the length of the cable or flexible tube.

18. A diaphragm valve as claimed in claim 1 or claim 2, further comprising latching means arranged to maintain the diaphragm in the first position and / or the second position.

19. The diaphragm valve of claim 7, including a housing defining a volume that at least partially houses the diaphragm, the closure member, and the machine tool.

20. The diaphragm valve according to claim 19, wherein The housing defines a seat which defines the first position and / or the second position of the diaphragm.

21. A diaphragm valve according to claim 19 or claim 20, wherein: The diaphragm closes the volume to form a closed space on the second side of the diaphragm.

22. The diaphragm valve according to claim 21, wherein The exhaust path passes through the enclosed space.

23. The diaphragm valve of claim 19, comprising a retaining ring to at least partially retain the diaphragm within the volume and at least partially define the first position and / or the second position of the diaphragm.

24. A bath accessory comprising: main body; One or more entrances; as well as One or more outlets, at least one of the one or more outlets having a diaphragm valve as claimed in any preceding claim, the diaphragm valve being arranged to open and close the outlet.

25. The bath accessory of claim 24, wherein: The housing includes an internal configuration that defines the inlet of the diaphragm valve and the outlet of the diaphragm valve.

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