Patent Description:
A fluid control device for an ablutionary fitting typically may comprise one or more valves, which can be operated by a user pressing a button or similar control member which acts on a mechanical actuator. The valve(s) may be operable to allow or prevent flow to an outlet. In an ablutionary system a fluid delivery device such as a shower head or faucet may be downstream of, and in fluid communication with, the outlet.

Opening and closing the valve typically requires overcoming a water pressure. The magnitude and direction of the force required to open the valve can, for example, limit design freedom when positioning a control member of the fluid control device in relation to the valve.

<CIT> discloses a valve mechanism comprising a tubular housing. An activating and activated cylinder engage to drive a rod and sealing member.

<CIT> discloses a valve arrangement including a lever comprising a cam surface and a cylinder comprising two valve members.

<CIT> discloses a valve device comprising a rotary member having an angled surface, wherein the angled surface is in contact with a pair of rockers that may act to open and close two valves.

A first aspect provides a fluid control device for an ablutionary fitting comprising:.

wherein, in use, the rotary control member is rotatable such that the cam surface drives the first operating member in a linear direction and the first operating member acts in turn on the first valve actuator to move the valve member from an open position to a closed position and vice versa, wherein the cam surface is configured such that, by rotating the rotary control member, in use, a user can select whether the first valve is open or closed; and.

Advantageously, a rotary control member comprising a cam surface may allow for a user to control the operation of a valve member by providing a relatively smaller force and/or by providing a smaller rotation. Accordingly, the first valve may be a "low-force" valve. Being able to employ a low-force valve may be beneficial, for example, for less strong or less manually dextrous users.

The first valve actuator comprises a separate distinct member to the first operating member. The first valve actuator may be operable to move in the same linear direction as the first operating member. The first valve actuator and the first operating member may be arranged to move along the same linear axis. The first valve actuator and the first operating member may be arranged to move in the same linear direction along parallel linear axes.

The first valve may comprise a first valve outlet. The valve may be configured such that when in the open position the valve member is arranged to allow fluid flow through the first valve outlet, while in the closed position the valve member is arranged to prevent fluid flow through the first valve outlet.

The rotary control member may be adapted in any suitable way to assist the user in rotating the rotary control member. For example, the rotary control member may comprise a lever, a handle or the like.

The cam surface may comprise a series of peaks and troughs, including at least one peak and at least one trough. For example, the cam surface may comprise a regular, or an irregular, pattern of peaks and troughs. The cam surface may be configured such that any suitable angle of rotation moves the valve member from the open position to the closed position or vice versa. The cam surface may be arranged such that when a user rotates the rotary control member through up to or at least <NUM>°, up to or at least <NUM>°, up to or at least <NUM>°, up to or at least <NUM>°, up to or at least <NUM>° or up to <NUM>°, for example, the valve member moves from the open to closed position, or vice versa.

The rotatable control member may be rotated freely through <NUM>° or more either clockwise or anti-clockwise. The rotatable control member may be rotatable through a limited arc in either direction. The limited arc may be, for example, up to <NUM>°, up to <NUM>°, up to <NUM>°, up to <NUM>° or up to <NUM>° in either direction.

The operating member may comprise an elongate member. The operating member may comprise a rigid elongate member.

The operating member may comprise an irregular shape such that the second end is arranged to move linearly along an axis parallel to the axis along which the first end is arranged to move.

The operating member may be biased, e.g. resiliently biased, in a direction towards the rotary control member. The operating member may be resiliently biased in a direction towards the rotary control member by one or more resilient members, e.g. a spring, a deformable member or the like.

The fluid control device may comprise a support frame configured to at least partially surround the operating member. The support frame may substantially entirely surround the operating member. The support frame may be configured such that it does not interfere with linear movement of the operating member. The support frame may be configured such that it substantially prevents movement of the operating member in one or more directions perpendicular to the direction of linear movement.

Conveniently, the rotary control member may be disposed away from the first valve.

The control lever may comprise a lever arm extending from near to or at a first end of a shaft. The lever arm may extend perpendicularly from the shaft. The control lever may be fixedly connected to the shaft such that rotation of the control lever causes rotation of the shaft, and vice versa.

The shaft may comprise an elongate member extending from the first end to a second end. The shaft may be arranged to rotate about the longitudinal axis of the shaft. The shaft may be arranged such that the second end extends underneath a portion of the valve member.

A second control lever may extend from near to or at the second end of the shaft. The second control lever may comprise a lever arm extending away from the shaft. The lever arm of the first control lever may be parallel to the lever arm of the second control lever. The second control lever may be fixedly attached to the shaft such that rotation of the shaft causes rotation of the second control lever, and vice versa.

At least a portion of the second control lever may abut a surface of the valve member. The second control lever may be arranged such that movement of the second control lever causes movement of the valve member.

The valve member may be operable to move linearly along a single axis between an open and closed position. The valve member may be arranged to seal and unseal the first valve outlet.

The second control lever may be arranged to abut a surface of a further valve member. The further valve member may comprise a diaphragm valve. The diaphragm valve may be arranged to move between an open and closed position. The second control lever may be arranged to move the diaphragm valve between an open and closed position.

When in the open position, the diaphragm valve may allow water to flow therethrough and towards the valve member. The flow of water may force the valve member from the closed position to the open configuration.

A smaller force may be required to open the diaphragm valve than to open the valve member. Advantageously, a smaller force may be applied by a user in order to open the diaphragm valve wherein the flow of water then provides the force required to open the valve member.

The diaphragm valve and/or the valve member may be biased towards the closed configuration. The biasing means may comprise a resiliently deformable member such as a spring, for example. The diaphragm valve may comprise a diaphragm member arranged to be resiliently biased towards the closed configuration.

When in the closed configuration the valve member may be configured to prevent the passage of fluid from the valve outlet. When in the open configuration the valve member may allow the passage of fluid from the valve outlet.

The fluid control device may comprise one or more further valves, e.g. a second valve. The or each further valve, e.g. the second valve, may be arranged similarly to the first valve such that, in use, the rotary control member is rotatable such that the cam surface drives a further, e.g. second, operating member in a linear direction and each further, e.g. second, operating member acts in turn on a further, e.g. second, valve actuator to move a further, e.g. second, valve member from an open position to a closed position and vice versa, wherein the cam surface is configured such that, by rotating the rotary control member, in use, a user can select whether the further, e.g. second, valve is open or closed.

For example, the cam surface may be arranged such that a user can select whether either, or both, of the first and second valves are open or closed.

The fluid control device may comprise a mixer valve. The mixer valve may be arranged to receive a flow of hot water and a flow of cold water. The mixer valve may be operable to control the flow of fluid therethrough and may be operable to control the temperature of the fluid flowing through a mixer valve outlet.

The first valve and, if present, further, e.g. second, valves may be arranged to receive a flow of water from the mixer valve. The mixer valve may comprise a single outlet arranged to provide a flow of fluid to both the first and further, e.g. second, valves.

The first and further, e.g. second, valves may each be arranged to provide a flow of fluid to a different fluid delivery device. The first and second valves may be arranged to provide a flow of fluid to a handheld shower spray head and a fixed shower spray head or spray plate, for example.

A second aspect provides an ablutionary fitting comprising a fluid control device according to the first aspect.

A third aspect provides an ablutionary system comprising:.

Except where mutually exclusive, any of the features of any of the above described aspects may be employed mutatis mutandis in any of the other above described aspects.

Example embodiments will now be described with reference to the accompanying drawings, in which:.

Referring to <FIG>, a fluid control device <NUM> for an ablutionary fitting is shown. The fluid control device <NUM> is operable to control, in use, fluid flow and temperature to two fluid delivery devices downstream of the fluid control device <NUM>.

The fluid control device <NUM> comprises a thermostatic mixer valve <NUM> disposed within a body <NUM>. The body <NUM> has a first end <NUM> and a second end <NUM>. Near the first end <NUM> of the body <NUM>, a rotary control member <NUM> encircles the body <NUM> and has a cam surface <NUM> on an underside thereof. The rotary control member <NUM> is rotatable about an axis <NUM> running longitudinally through the body <NUM>.

The cam surface <NUM> comprises a series of peaks and troughs.

The thermostatic mixer valve <NUM> is configured to receive, in use, a flow of hot water and a flow of cold water. The body <NUM> comprises two inlets <NUM>, <NUM>, each configured to receive either the flow of hot water or the flow of cold water. The inlets <NUM>, <NUM> are disposed at the second end <NUM> of the body <NUM> and are configured such that water flows through the inlets in a direction substantially parallel to the axis of rotation <NUM> of the rotary control member <NUM>.

The thermostatic mixer valve <NUM> comprises a mixing chamber with two mixer valve inlets, one for receiving the flow of hot water and the other for receiving the flow of cold water. A mixer valve outlet leads from the mixing chamber to convey, in use, a flow of water having a user-specified temperature. A rotary control means <NUM> is provided to allow the user to set and adjust the user-specified temperature.

A first operating member <NUM> and second operating member <NUM> are arranged at opposing sides of the body <NUM>. The operating members <NUM>, <NUM> comprise substantially rigid elongate members and are arranged to move linearly along an axis parallel to the axis of rotation <NUM> of the rotary control member <NUM>.

A control lever <NUM>, <NUM> is disposed below each of the operating members <NUM>, <NUM>. Each control lever <NUM>, <NUM> comprises a lever arm <NUM>, <NUM> and a shaft <NUM>, <NUM>. Each lever arm <NUM>, <NUM> extends away from and is arranged perpendicularly to the respective shaft <NUM>, <NUM>. Each control lever <NUM>, <NUM> is arranged to rotate about an axis running longitudinally through the respective shaft <NUM>, <NUM>.

The operating members <NUM>, <NUM> comprise a first end and a second end, with the first end arranged to contact the cam surface <NUM> of the rotary control member <NUM> and the second end arranged to contact a respective lever arm <NUM>, <NUM>.

A first valve <NUM> and a second valve <NUM> are disposed towards the second end of the body <NUM>. Each valve comprises a valve inlet and a valve outlet <NUM>, <NUM>. Each valve comprises a valve member <NUM>, <NUM> operable to control the flow of water through the respective valve outlet <NUM>, <NUM>. Each valve inlet is in fluid communication with the mixer valve outlet.

Each valve outlet <NUM>, <NUM> is configured to convey a flow of water from a valve <NUM>, <NUM> to a separate body outlet <NUM>, <NUM> disposed on the body <NUM>. The body outlets <NUM>, <NUM> are disposed between the second end <NUM> of the body <NUM> and the rotary control member <NUM>. The body outlets <NUM>, <NUM> are arranged to convey fluid from the body <NUM> in a direction substantially perpendicular to the axis of rotation <NUM> of the rotary control member <NUM>.

Each shaft <NUM>, <NUM> is arranged to extend from the associated lever arm <NUM>, <NUM> and is received into a lower portion of a valve <NUM>, <NUM>. Each valve member <NUM>, <NUM> is configured to be moved from the open position to the closed position and vice versa by rotation of the shaft <NUM>, <NUM>.

The cam surface <NUM> comprises a wave pattern configured such that a user can select whether neither, either or both of the first valve <NUM> and the second valve <NUM> is/are open by rotating the rotatable control member <NUM>. When the first end of an operating member <NUM>, <NUM> is in contact with a trough portion of the cam surface <NUM>, the associated valve <NUM>, <NUM> is in a closed configuration. When the first end of an operating member <NUM>, <NUM> is in contact with a peak portion of the cam surface <NUM>, the associated valve <NUM>, <NUM> is in an open configuration.

A second control lever <NUM>, <NUM> is disposed within each valve <NUM>, <NUM> and is attached to the shaft <NUM>, <NUM> such that rotation of the shafts <NUM>, <NUM> causes rotation of the respective second control lever <NUM>, <NUM>. The second control levers <NUM>, <NUM> are configured to move a valve member <NUM>, <NUM> into and out of a valve outlet sealing configuration. In a sealed configuration, water is prevented from flowing through the valve outlet <NUM>, <NUM>. In an un-sealed configuration, water may flow through the valve outlet <NUM>, <NUM>.

The valve members <NUM>, <NUM> are biased towards the sealed configuration by a resilient member. A spring <NUM>, <NUM> is used as the resilient member to bias each of the valve members <NUM>, <NUM>. The springs <NUM>, <NUM> are configured to urge the valve members <NUM>, <NUM> into the closed configuration.

The operating members <NUM>, <NUM> are biased towards the sealed configuration by further resilient members. An operating member spring <NUM> is used as the further resilient member to bias the first operating member <NUM> in a direction towards the rotary control member <NUM>. Another operating member spring (not shown) is used as the further resilient member to bias the second operating member <NUM> in a direction towards the rotary control member <NUM>.

In some embodiments the fluid control device may not comprise the springs <NUM>, <NUM>. In some embodiments the fluid control device may not comprise the operating member springs <NUM>.

The fluid control device <NUM> also comprises a frame <NUM> arranged to extend around a portion of the fluid control device <NUM>. The frame <NUM> is configured to extend over a portion of the operating members <NUM>, <NUM> and as such, helps prevent unwanted lateral movement. The frame <NUM> may also be configured to cooperate with the operating member springs.

In some embodiments, the valve member <NUM>, <NUM> comprises a diaphragm valve. In such embodiments, the second control lever <NUM>, <NUM> is operable to control movement of the diaphragm valve between an open and closed configuration. The opening and closing of the diaphragm valve is arranged to cause opening and closing of the valve member <NUM>, <NUM>.

In use, a user may rotate the rotary control member <NUM> either clockwise or anticlockwise. Rotation of the rotary control member <NUM> causes movement of the cam surface <NUM> with respect to the first end of the operating members <NUM>, <NUM>. The rotary control member <NUM> may be rotated through a first rotation to open one or both of the valves <NUM>, <NUM>.

When the rotary control member <NUM> is rotated such that the portion of the cam surface <NUM> in contact with the first end of an operating member <NUM>, <NUM> moves from a trough to a peak, the operating member <NUM>, <NUM> is urged in a linear direction towards the second end of the body <NUM>, and vice versa. As such, the operating members <NUM>, <NUM> are either urged towards the second end of the body <NUM> when in contact with a peak of the cam surface <NUM>, or allowed to move towards the first end <NUM> of the body <NUM> when in contact with a trough portion of the cam surface <NUM>.

When an operating member <NUM>, <NUM> is urged towards the second end <NUM> of the body <NUM>, the second end of the operating member <NUM>, <NUM> acts on the associated lever arm <NUM>, <NUM> such that the lever arm <NUM>, <NUM> rotates towards the second end <NUM> of the body <NUM>.

Rotation of a lever arm <NUM>, <NUM> towards the second end of the body <NUM> rotates the connected shaft <NUM>, <NUM> which in turn rotates the connected second control lever <NUM>, <NUM> disposed within the body <NUM> of a valve <NUM>, <NUM>.

Rotation of a second control lever <NUM>, <NUM> towards the second end of the body <NUM> causes the second control lever <NUM>, <NUM> to act on the valve member <NUM>, <NUM> such that the valve member <NUM>, <NUM> moves towards the second end of the body <NUM> and away from the associated valve outlet <NUM>, <NUM>. Movement of a valve member <NUM>, <NUM> away from a valve outlet <NUM>, <NUM> moves the valve member <NUM>, <NUM> into the open configuration such that a flow of water may pass through the valve outlet.

In embodiments comprising a diaphragm valve, a diaphragm valve is disposed within each valve <NUM>, <NUM> and is arranged to move between an open and closed position. The second control lever <NUM>, <NUM> is operable to move the diaphragm valve between an open and closed position.

When in the open position, the diaphragm valve allows water to flow therethrough and towards the associated valve member <NUM>, <NUM>. The flow of water applies a force on the valve member <NUM>, <NUM> such that the valve member <NUM>, <NUM> is urged from the closed position to the open configuration.

Rotation of a second control lever <NUM>, <NUM> back towards the second end <NUM> of the body <NUM> causes the diaphragm valve to return to a sealed configuration. Sealing of the diaphragm valve prevents a flow of water therethrough, and as such stops the flow of water flowing through the valve outlet <NUM>, <NUM>.

The spring applies a continuous force on the valve member <NUM>, <NUM> in the direction of the first end <NUM> of the body <NUM> and urges the valve member <NUM>, <NUM> towards the closed configuration. The force applied by the spring to the valve member <NUM>, <NUM> therefore acts on the second control lever <NUM>, <NUM>, biasing the second control lever <NUM>, <NUM> towards the first end <NUM> of the body <NUM>.

The biasing force acting on the second control lever <NUM>, <NUM> is transmitted through the shaft <NUM>, <NUM> such that is also acts on the lever arm <NUM>, <NUM>. The force acting on the lever arm <NUM>, <NUM> is therefore applied to the second end of the operating member <NUM>, <NUM>, which biases the operating member <NUM>, <NUM> towards the cam surface <NUM>. This biasing force maintains the contact between the lever arm <NUM>, <NUM> and the second end of the operating member <NUM>, <NUM>, and also maintains the contact between the first end of the operating member <NUM>, <NUM> and the cam surface <NUM>.

In use, when the rotary control member <NUM> is rotated such that the portion of the cam surface <NUM> in contact with the first end of an operating member <NUM>, <NUM> moves from a peak to a trough, the operating member <NUM>, <NUM> is biased such that it moves towards the first end <NUM> of the body <NUM>.

<FIG> and <FIG> each show a side view of half the fluid control device <NUM>. <FIG> shows the fluid control device <NUM> with a valve in an open position and <FIG> shows the fluid control device <NUM> with a valve in a closed position.

The control lever <NUM> is shown disposed below the operating member <NUM> and the control lever <NUM> comprises the lever arm <NUM>. The first end of the operating member <NUM> can be seen contacting the cam surface <NUM> of the rotary control member <NUM> and the second end is arranged to contact the respective lever arm <NUM>.

In <FIG>, the rotary control member <NUM> has been rotated such that the cam surface <NUM> has forced the operating member <NUM> in the direction of the control lever <NUM>. In this way, the operating member spring <NUM> has been compressed. As the operating member spring <NUM> is arranged to bias the operating member <NUM> in a direction towards the rotary control member <NUM>, the first end of the operating member <NUM> remains in contact with the cam surface <NUM> throughout operation.

In <FIG>, the rotary control member <NUM> has been rotated such that the cam surface <NUM> allows the operating member <NUM> to move in the direction of the control lever <NUM>. In this way, the operating member spring <NUM> assists in biasing the operating member towards the cam surface <NUM>. As the operating member spring <NUM> is arranged to bias the operating member <NUM> in a direction towards the rotary control member <NUM>, the first end of the operating member <NUM> remains in contact with the cam surface <NUM> throughout operation.

<FIG> shows schematically an example embodiment of a rotary control member <NUM> for use in a flow control device according to the present disclosure, e.g. the flow control device <NUM> described above. The rotary control member <NUM> comprises an annular body <NUM> with a cam surface <NUM> on an underside thereof. The annular body <NUM> may be adapted in any suitable way to facilitate manual rotation of the rotary control member <NUM>. The cam surface <NUM> has a series of peaks and troughs arranged to enable selective operation of one or more valves, as described below.

<FIG> shows the rotary control member <NUM> with an end of a first operating member <NUM> and an end of a second operating member <NUM> abutting the cam surface <NUM>. The first operating member <NUM> and the second operating member <NUM> each have the form of a rod and extend away from the cam surface <NUM>. At their other ends, the first operating member <NUM> and the second operating member <NUM> each engage with a control lever (not shown) arranged to open and close a valve (not shown) in response to rotation of the rotary control member <NUM>. In an example implementation, the cam surface <NUM> may be configured such that none, either one or both of the valves may be open at a given time.

<FIG> and <FIG> illustrate schematically operation of the rotary control member <NUM>. In <FIG>, the rotary control member <NUM> is in a central position. <FIG> shows the rotary control member <NUM> rotated <NUM>° anticlockwise from the central position. <FIG> shows the rotary control member <NUM> rotated <NUM>° clockwise from the central position.

The cam surface <NUM> is configured such that when the rotary control member <NUM> is in the central position (i.e. as shown in <FIG>), the second operating member <NUM> is urged downwards to engage the control lever to open the valve associated therewith.

The cam surface <NUM> is configured such that when the rotary control member <NUM> is in the central position (i.e. as shown in <FIG>), the first operating member <NUM> is not urged into engagement with the control lever and the valve associated therewith consequently remains closed.

When the rotary control member <NUM> is in the position shown in <FIG>, the cam surface <NUM> is configured such that both the first operating member <NUM> and the second operating member <NUM> are urged downwards to engage respective control levers to open the respective valves associated therewith.

When the rotary control member <NUM> is in the position shown in <FIG>, the cam surface <NUM> is configured such that the first operating member <NUM> is urged downwards to engage the control lever to open the valve associated therewith. The cam surface <NUM> is configured such that when the rotary control member <NUM> is in the position shown in <FIG>, the second operating member <NUM> is not urged into engagement with the control lever and the valve associated therewith consequently remains closed.

<FIG> illustrates an ablutionary system <NUM> including the fluid control device <NUM>. The fluid control device <NUM> receives a flow of hot water from a hot water source <NUM> such as a boiler via a hot water supply pipe <NUM>. The fluid control device <NUM> also receives a flow of cold water from a cold water source <NUM> such as a mains water supply via a cold water supply pipe <NUM>. Downstream of the fluid control device <NUM>, a first delivery conduit <NUM> leads to a first fluid delivery device <NUM>. A second fluid delivery conduit <NUM> leads to a second fluid delivery device <NUM>.

For example, the first fluid delivery device <NUM> may comprise a spray head for a shower and the second fluid delivery device <NUM> may comprise a faucet or vice versa. In another example, the first fluid delivery device <NUM> may comprise a fixed showerhead and the second fluid delivery device <NUM> may comprise a hand-held showerhead or vice versa.

By operating the fluid control device <NUM>, a user may be able to control the flow of water such that water may be selectively delivered by none, either one or both of the first fluid delivery device <NUM> and the second fluid delivery device <NUM>. The fluid control device <NUM> thus functions as a diverter. The user may also be able to use the fluid control device <NUM> to control the temperature of the water being delivered.

<FIG> and <FIG> show an example embodiment of a rotary control member <NUM> for use in a flow control device according to the present disclosure, e.g. the flow control device <NUM> described above. The rotary control member <NUM> comprises an annular body <NUM> with a cam surface <NUM> on an underside thereof. The annular body <NUM> may be adapted in any suitable way to facilitate manual rotation of the rotary control member <NUM>. The cam surface <NUM> has a series of peaks and troughs arranged to enable selective operation of one or more valves, as described below.

Abutting the cam surface <NUM> is a first end <NUM> of a first operating member <NUM> and a first end <NUM> of a second operating member <NUM>. The first operating member <NUM> and the second operating member <NUM> each have the form of a rod and extend away from the cam surface <NUM>. At their other ends, the first operating member <NUM> and the second operating member <NUM> each engage with a control lever <NUM>, <NUM> arranged to open and close a valve (not shown) in response to rotation of the rotary control member <NUM>. In an example implementation, the cam surface <NUM> may be configured such that none, either one or both of the valves may be open at a given time.

Each operating member <NUM>, <NUM> is resiliently biased towards the rotary control member <NUM> by a spring <NUM>, <NUM>. Each spring <NUM>, <NUM> provides a biasing force that assists in maintaining contact between the first end <NUM> of the first operating member <NUM> and the first end <NUM> of a second operating member <NUM> with the cam surface <NUM>.

Various modifications may be made to the example fluid delivery device and/or ablutionary system described herein.

For example, the extent of rotation required to switch the setting of the valve(s) may be any suitable angular amount, e.g. at least <NUM>°, up to or at least <NUM>°, up to or at least <NUM>°, up to or at least <NUM>°, up to or at least <NUM>° or up to or at least <NUM>°.

For example, the fluid delivery device need not include a thermostatic mixer valve. The fluid delivery device may comprise a non-thermostatic mixer valve instead, e.g. a mechanical mixer valve.

As another example, the fluid delivery device may not include a mixer valve of any sort. The fluid delivery device may be adapted to receive a flow of water from a single source, e.g. a mains water supply. Any suitable heating means may be employed to heat the flow of water to a user-selected temperature.

The fluid delivery device may be adapted to provide user control and/or selection of any number of fluid delivery devices downstream of the fluid delivery device. The fluid delivery device may be arranged to provide user control and/or selection of a plurality of spray modes from a given fluid delivery device.

Claim 1:
A fluid control device (<NUM>) for an ablutionary fitting comprising:
a rotary control member (<NUM>) comprising a cam surface (<NUM>);
a first valve (<NUM>) comprising a valve member (<NUM>);
a first valve actuator; and
an operating member (<NUM>);
wherein, in use, the rotary control member (<NUM>) is rotatable such that the cam surface (<NUM>) drives the operating member (<NUM>) in a linear direction and the operating member (<NUM>) acts in turn on the first valve actuator to move the valve member (<NUM>) from an open position to a closed position and vice versa, wherein the cam surface (<NUM>) is configured such that, by rotating the rotary control member (<NUM>), in use, a user can select whether the first valve (<NUM>) is open or closed; and
wherein the first valve actuator comprises a control lever (<NUM>); and
wherein the operating member (<NUM>) comprises a first end and a second end, wherein the first end is arranged to contact the cam surface (<NUM>) and the second end is arranged to contact the first valve actuator.