AU2013203987A1

AU2013203987A1 - Liquid Supply Control System

Info

Publication number: AU2013203987A1
Application number: AU2013203987A
Authority: AU
Inventors: Philip George Doust
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-08-22
Filing date: 2013-04-11
Publication date: 2014-03-13
Also published as: AU2013305477A1; AU2013305477B2; WO2014028970A1

Abstract

- 14 A water control supply system 10 has a first inlet 12, a second inlet 14, and an outlet 16. The first inlet 12 is connected to a mains supply while the second inlet 14 is 5 connected to a water tank via a pump. The system 10 also has a first hydraulic valve 18 and a second hydraulic valve 20. The first valve 18 is arranged to open and close a first fluid flow path 22 (depicted by dash line). The fluid flow path 22 is a flow path for mains water at the first inlet 12 to the outlet 16. The valve 20 is arranged to open and close a second flow path 24 (depicted by a dot line) from the second inlet 14 to the 10 outlet 16. The valve 20 also operates a bleed valve 74 that controls the operation of the valve 18. When the valve 20 opens it operate the bleed valve 74 to effectively close the valve 18. 4226923_5 (GHMates) P90878.AU.1 11/04/13 \ , - - x C,,

Description

- 1 LIQUID SUPPLY CONTROL SYSTEM Field of the Invention 5 The present invention relates to a liquid supply control system and in particular, although not exclusively, for controlling the supply of liquid such as water from two different supplies to a common outlet. Background of the Invention 10 It is becoming more common and economically viable to supplement mains water usage with water from alternate sources. The alternate sources may be for example water tanks that are fed by runoff from the roof of a building. Indeed in Australia some state governments have introduced legislation requiring new home builders to install 15 rain water tanks to supply water for non-consumption use such as for toilets, laundries and reticulation. When water is not available from the alternate supply for example due to it being empty or loss of power for an associated pump, it is necessary to provide water via the 20 mains supply. Various controllers and valves are currently available that enable the supply of water to be automatically switched between an alternate supply such as a rain water tank and mains water. A pump is normally used to pump the water from the alternate supply. Usually the 25 pump provides the water at a different pressure to mains pressure. When water is being supplied from the alternate supply via the pump there is a possibility that the mains supply will leak into the outlet. Thus a mixture of mains water and water from the alternate supply are provided rather than water from the alternate supply only. 30 Summary of the Invention In one aspect the invention provides a liquid supply control system comprising a first inlet, a second inlet, and an outlet; a first hydraulic valve arranged to selectively open and close a first fluid path 35 between the first inlet and the outlet; a second hydraulic valve arranged to selectively open and close a second fluid path between the second inlet and the outlet; 4226923_5 (GHMates) P90878.AU.1 11/04/13 -2 the first and second valves arranged to cooperate with each other when the outlet is open so that when one of the valves is shut the other valve is open. In one embodiment the first and second valves are arranged so that when the outlet is 5 shut both of the first and second valves are shut. In one embodiment the first and second valves are arranged so that when the outlet is shut the first and second valves are held shut by a common hydraulic pressure. 10 In one embodiment the liquid supply control system comprises a fluid bleed path between the first and second valves enabling the first and second valves to be held shut by the common hydraulic pressure. In one embodiment the liquid supply control system comprises a fluid bleed path 15 between the first and second valves. In one embodiment the liquid supply control system comprises a bleed valve arranged to open and close the fluid bleed path wherein the bleed valve is controlled by the second valve. 20 In one embodiment the second valve is operatively associated with the bleed valve to cause the bleed valve to close the fluid bleed path when the second valve is open, and to open the fluid bleed path when the second valve is shut. 25 In one embodiment each of the first and second valves comprises a movable diaphragm coupled with a corresponding pressure chamber and a valve seat, the valve seat providing communication between the corresponding inlet and the outlet, wherein the diaphragm is movable between a closed position in which the diaphragm bears on the seat and closes an associated fluid path between the corresponding inlet and 30 outlet, and an open position where the diaphragm is lifted from the seat to open the associated flow path, the diaphragm having one or more orifices to enable fluid communication between the associated inlet and corresponding pressure chamber; and wherein the fluid bleed path extends between respective pressure chambers. 35 In one embodiment the liquid supply control system comprises a mechanical actuator coupled between the diaphragm on the second valve and the bleed valve. 4226923_5 (GHMates) P90878.AU.1 11/04/13 -3 In one embodiment the first inlet is arranged to connect to a mains water supply. In one embodiment the second inlet is arranged to connect to a pump configured to pump water from a water storage facility. 5 In one embodiment the liquid supply control system comprises a sensor within a pump arranged to provide a signal to facilitate turning ON of the pump when the outlet is open, power is available to the pump and the water storage facility has at least a minimum level of water. 10 In a second aspect the invention provides a liquid supply control system comprising: a first inlet, a second inlet, and an outlet; a first hydraulic valve arranged to selectively open and close a first fluid path between the first inlet and the outlet; 15 a second hydraulic valve arranged to selectively open and close a second fluid path between the second inlet and the outlet; and, a bleed valve arranged to open and close a fluid bleed path between the first and second valves wherein the bleed valve is controlled by the second valve. 20 In a third aspect the invention provides a liquid supply control system comprising: a first inlet, a second inlet, and an outlet; a first hydraulic valve arranged to selectively open and close a first fluid path between the first inlet and the outlet; a second hydraulic valve arranged to selectively open and close a second fluid 25 path between the second inlet and the outlet; and a fluid bleed path between the first and second valves, wherein the second valve is operable to close the fluid bleed path when in an open state wherein liquid entering the first inlet hydraulically closed the first valve and the first fluid path. 30 Brief Description of the Drawings An embodiment of the present invention will now be described by way of example only with reference to the accompanying drawings in which: 35 Figure 1 is a schematic representation of a liquid supply control system in accordance with the present invention when in a no flow state; 4226923_5 (GHMates) P90878.AU.1 11/04/13 -4 Figure 2 is a schematic representation of the liquid supply control system shown in Figure 1 when in a tank supply state; and, 5 Figure 3 is a schematic representation of the water supply control system depicted in Figure 1 but when in a mains supply state. Detailed Description of the Preferred Embodiments 10 For ease of description herein after the system 10 and its operation will be described in an application where the liquid is water. However the system 10 is not limited to use with water and may be used to control the flow of the liquids such as beverages or liquid fuels. 15 Figure 1 illustrates an embodiment of a water supply control system 10 in an OFF state. In the OFF state no water is supplied by the system 10. The water control supply system 10 comprises a first inlet 12, a second inlet 14, and an outlet 16. In this embodiment the first inlet 12 is arranged to be connected to a mains 20 supply while the second inlet 14 is arranged to be connected to a water tank via a pump (not shown). The system 10 also comprises a first hydraulic valve 18 and a second hydraulic valve 20. The first valve 18 is arranged to open and close a first fluid flow path 22 (depicted by dash line). The fluid flow path 22 is a flow path for mains water at the first inlet 12 to the outlet 16. The valve 20 is arranged to open and close a 25 second flow path 24 (depicted by a dot line) from the second inlet 14 to the outlet 16. As explained in greater detail below the valves 18 and 20 are arranged to cooperate with each other so that when the outlet 16 is open one of the valves 18, 20 is shut and the other valve 18, 20 is open. More particularly, in the event that water is available in 30 the supply coupled to the inlet 14, and power is available to the pump providing water from the supply to the inlet 14, then the valve 20 will open and the valve 18 will close. This relative configuration of the valves 18 and 20 is shown in Figure 2 and will be termed as the "pump supply state". However, again with the outlet 16 open, if water is not available at the inlet 14, for example by reason of the pump not being energised or 35 the level of water in the supply being below a predetermined level, then the valve 20 will close and the valve 18 will open so that water from the mains supply will flow from the inlet 12 to the outlet 16. This configuration is shown in Figure 3 and will be termed 4226923_5 (GHMates) P90878.AU.1 11/04/13 as the "mains supply state". The system 10 comprises a body 26 which is configured to form the first and second inlets 12 and 14, and the outlet 16. In addition the body 26 houses and forms part of 5 the first and second valves 18 and 20. To facilitate the construction of the system 10, the body 26 is made from a number of parts. In the present embodiment the body 26 comprises a first part 28 and a demountably attachable second part 30. The part 28 is formed with tubular portions 32, 34 and 36 which form the first inlet 12, second inlet 14, and outlet 16 respectively. First and second valve seats 38 and 40 are also formed in 10 the first part 28 of a body 26. The seat 38 is formed as a flat annular surface at an axial end of a throat 42 formed internally of the first part 28. The throat 42 has a side opening 44 to enable flow of water through the seat 38 to the outlet 16. An internal wall 46 is formed in the first part 28 to prevent water that enters through the first inlet 12 from passing into the outlet 16 except through the seat 38. 15 First valve 18 comprises in conjunction with the seat 38, a resilient diaphragm 48 and a spring 50. The spring 50 is retained between a central recessed portion 52 of the diaphragm 48 and recess 54 formed in the second part 30 of the body 26. The recess portion 52 of the diaphragm 48 is configured so that when it abuts the seat 38, it 20 extends beyond the outer radius of, and completely closes, the seat 38. The combination of the second part 30 and the diaphragm 48 form part of a pressure chamber 56 of the first valve 18. Bleed holes 58 are formed in the diaphragm 48 allowing fluid communication between the inlet 12 and the pressure chamber 56. Optional check valves 59 are shown in the inlet 12 to prevent a back flow of water into 25 the mains supply. As will be recognised by those skilled in the art, the valve 18 which comprises the seat 38, diaphragm 48, spring 50 and pressure chamber 56 is of the same basic configuration as a common solenoid controlled diaphragm valve often used in domestic 30 reticulation systems and household appliances such as washing machines. Looking at the valve 18 in isolation, the general principle of operation is as follows. Assume as initial conditions that water at mains pressure is present at the inlet 12, the outlet 16 is open and the pressure chamber 56 to be completely sealed (save for the 35 bleed holes 58). The mains water will flow through the bleed holes 58 into the chamber 56. The spring 50 is arranged so that by itself it is not sufficiently strong to resist water pressure from the inlet 12 from lifting the diaphragm 48 from the seat 38 4226923_5 (GHMates) P90878.AU.1 11/04/13 -6 and thus opening the valve 18. However because water is bleeding into the chamber 56 via hole 58 eventually the chamber 56 fills with water at the same pressure as that available at the inlet 12. So now the same water pressure is acting on opposite sides of the diaphragm. But there is a difference in the surface area on which the water 5 pressure acts. Specifically, in the chamber 56, water pressure is able to act on the entire surface area of the diaphragm 48. But on the opposite side water pressure available at the inlet 12 is only able to act on the surface area of the diaphragm 48 which does not include the area encompassed by the seat 38. Accordingly the total force acting downwardly on the diaphragm 48 onto the seat 38 is greater than the force 10 acting in an opposite direction. Thus, the water pressure at the inlet 12 in effect holds the valve 18 shut. That is, the valve 18 held closed by the mains water pressure. The valve 18 will indeed remain closed even if the outlet 16 is opened unless the pressure in the chamber 56 is relieved. As explained below such pressure relief can be provided by action of the second valve 20 which operates a bleed valve 74. 15 The valve 20 is of substantially identical construction and operation to the valve 18. In this regard the valve 20 also comprises a diaphragm 60 formed with a central recess 61, orifices 62 and a pressure chamber 64. The pressures chamber is formed between the first and second parts 28 and 30 of the body 26 encasing the diaphragm 20 60. The valve 20 also includes a spring 66 that is arranged to bias the diaphragm 60 onto its seat 40. The spring 66 is retained within a recess 63 formed in the second part 30 and by a spindle 84. An end of the spindle 84 distant the spring seats in the central recess 61. The valve seat 40 is formed as an annular surface at an axial end of a throat 68 formed integrally with the body portion 28. The throat 68 is provided with an 25 opening 70 to the outlet 16. A wall 72 acts to prevent flow of water from the inlet 14 into the outlet 16 except via the seat 40 and opening 70. The second valve 20 is also utilised to operate the bleed valve 74 which is used to control flow of water through a bleed path 76 formed between the chambers 56 and 64, 30 and thus enable pressure relief in the chamber 56. The bleed path 76 is formed as a small tube that opens at one end into the chamber 56 and is coupled at an opposite end to a valve seat 78 which opens into the chamber 64. The valve seat 78 is supported in a bracket 79. The bleed valve is completed by a pin 35 80 that is moved into and off the seat 78 depending on the state of the valve 20 and in particular the position of its diaphragm 60. To this end, the bleed valve 74 is operated by a mechanical actuator 82 that couples the pin 80 to the diaphragm 60. The 4226923_5 (GHMates) P90878.AU.1 11/04/13 -7 mechanical actuator 82 comprises the spindle 84 and a lever arm 86 which is engaged with the spindle 84 between opposite spigots 88. The lever arm 86 can slide between the spigots 88 as the spindle 84 moves up and down. An opposite end of the lever arm 88 is attached via a pivot 90 to the pin 80. The lever arm 86 is also coupled 5 intermediate its length via a pivot 92 to the body 26. An opening 93 is formed in the bracket 79 enabling fluid communication between the chamber 64 and the outlet 16. When the valve 20 is in the closed position the diaphragm 60 abuts the seat 40, the mechanical actuator 82 and in particular arm 86 holds the pin 80 above and out of 10 contact with the seat 78 the bleed path 76 between the chambers 56 and 64 is open (shown in Figures 1 and 3). In this event fluid pressure can be communicated from chamber 56 through bleed path 78, chamber 64 and opening 93 to the outlet 16. Therefore when the valve 20 is closed the pressure in chamber 56 can be relieved (assuming the outlet 16 is opened) and accordingly the valve 18 can and will open. 15 When the valve 20 is open the diaphragm 60 is displaced from and raised above the seat 40, the mechanical actuator 82 holds the pin 90 in contact with the seat 78 and the bleed path 76 is closed (Figure 2). Thus now there is no pressure relief available to the chamber 56 and even if the outlet 16 is opened the mains water pressure will 20 keep the valve 18 closed. The operation of the system 10 will now be described. In this description it is assumed that the inlet 12 is connected to a mains supply of 25 water. The inlet 14 is connected via a pump to a water tank or other water reservoir or supply. The outlet 16 may be connected to a hose or any device that consumes water. For ease of description, we will assume that the outlet 16 is connected to a simple tap. The pump (not shown) connected with the inlet 14 is provided with non return valves and pressure switches so that it will turn itself off if subjected to a prescribed back 30 pressure. This is a standard feature of pumps of the type used in water supply systems. Assume that the outlet 16 is shut. As the outlet 16 is shut, the pump supplying water to the inlet 14 will not operate. This is due to the operation of the pumps pressure switch. 35 However at all times water at mains pressure is enters the inlet 12. As the outlet 16 is shut the mains water cannot flow out of the outlet 16. In addition the pump coupled to the inlet 14 prevents mains water from the inlet 12 flowing to the supply coupled via the 4226923_5 (GHMates) P90878.AU.1 11/04/13 -8 inlet 14. The mains water flows through the orifices 58 into the chamber 56. As the pump at inlet 14 is OFF the action of the spring 66 alone will force the diaphragm 60 onto the seat 40. Thus the bleed valve 74 is open and the pin 90 is raised from the seat 78. Therefore water at mains pressure can also flow into chamber 64 via the 5 orifices 58 and the bleed path 76. There will be a back flow of water from orifices 62 to, but not past, the pump connected to the inlet 14, as well as a flow of mains water form chamber 64 through opening 93 to the outlet 16. If desired, a check valve (not shown) may be installed in the inlet 14 to prevent this back flow from passing beyond the inlet 14. In this configuration it will be appreciated that mains water pressure is 10 now acting on both diaphragms 48 and 60 and thus holding closed both of the valves 18 and 20 which will not allow backflow in either valve. With reference to Figure 2, let us now assume that the outlet 16 is opened, power is available for the pump connected to the inlet 14, and the supply to which the pump is 15 connected has a viable volume of water. Opening of the outlet 16 causes an immediate pressure drop that automatically commences operation of the pump by action of its pressure switch. The pump will thus present water to the inlet 14 at the pump pressure. Simultaneously, the drop in 20 pressure is communicated to the chamber 64 via the orifice 93. At the instant of opening of the outlet 16 the bleed valve 74 is also open so that the drop in fluid pressure is also momentarily communicated to the chamber 56 via the bleed path 76. However as the pump is turned on, water pressure is also virtually instantaneously available at the inlet 14 to act on the underside of diaphragm 60. Due to the release of 25 pressure within the chamber 64, the pump pressure is able to overpower the spring 66 and lift the diaphragm 60 from the seat 40. Accordingly water provided by the pump flows through the flow path 24 to the outlet 16. As the diaphragm 60 lifts off the seat 40, the mechanical actuator 82 operates to close the bleed valve 74. Due to the closing of the bleed valve 74 fluid pressure within the chamber 56 is unable to escape. 30 As a consequence mains pressure which acts in the chamber 56 via the orifices 58 holds the valve 18 shut. Accordingly substantially no mains water flows into the outlet 16 while water is being supplied via the inlet 14. In a worst case scenario, there may be a momentary flow of water from the mains when the outlet 16 is open where the mains pressure may be sufficient to temporarily lift the diaphragm 48 from the seat 38 35 during the period while the bleed valve 74 is closing. However upon closure of the bleed valve 74 mains pressure communicated through the orifices 58 will very quickly close the valve 18. 4226923_5 (GHMates) P90878.AU.1 11/04/13 -9 Thus water is now being supplied to the outlet 16 via the inlet 14, while the inlet 12 is shut by the action of mains water pressure. This is the pump supply state of the system 10. 5 From this state, two scenarios are possible. The first scenario is that the outlet 16 is shut. The second scenario is that water from the tank is exhausted, or power is lost to the pump. 10 In the event that the outlet 16 is shut, there will be a build up in water pressure at the outlet 16 and subsequently in chamber 64. This will be detected by the pressure switch of the pump causing the pump to turn OFF. The turning OFF of the pump equalises the pressure at the inlet 14 thus allowing the spring 68 to assist the diaphragm 60 in a downward direction onto the seat 40. This in turn operates the 15 mechanical actuator 82 to lift the pin 80 from the seat 78 thus opening the bleed valve 74. The chambers 56 and 64 are now in fluid communication with each other via the bleed path 76. Thus now mains pressure is again communicated to chamber 64. This pressure in addition to the spring 66 forces the diaphragm 60 onto the seat 40 thus closing the valve 20. The system 10 is now reverted to the configuration shown in 20 Figure 1. The effect of the alternate scenario where either water in the tank is exhausted, or power to the pump is cut will now be described with reference to Figure 3. 25 It should also be remembered that at all times mains water pressure remains available at the inlet 12. With the outlet 16 open and the supply of water to the inlet 14 cut, there is an immediate reduction in pressure at the inlet 14. Also, as the outlet 16 remains open, water pressure from the chamber 64 is able to bleed via the orifice 93 to the outlet 16. The spring 66 assisted by pressure biases the diaphragm 60 toward the 30 seat 40. This in turn operates the mechanical actuator 82 to open the bleed valve 74. Opening of the bleed valve 74 allows water pressure from the chamber 56 to bleed via the bleed path 76, chamber 64 and opening 93 resulting in a drop in water pressure in the chamber 56. The mains pressure acting at inlet 12 is now able to lift the diaphragm 48 from the seat 38 so that the mains water can now flow through path 22 to the outlet 35 16. Accordingly mains water now supplies the outlet 16. By way of analogy the functionality and operation of the system 10 may be considered 4226923_5 (GHMates) P90878.AU.1 11/04/13 - 10 in terms of a regular solenoid operated reticulation valve as follows. The mains valve 18 may be considered to be analogous to the diaphragm valve part of a regular solenoid operated reticulation valve, while the combination of valve 20 and bleed valve 74 may be considered as analogous to solenoid part of the regular solenoid operated 5 reticulation valve. In the instance of embodiments of the current system 10, the 'solenoid part" analogue is now a fluid pressure activated valve (20 and 74) that controls the opening and closing of the mains valve 18. But when the fluid pressure activated valve (20 and 74) operate to close the mains valve 18 it also provides an alternate supply of water. 10 Now that an embodiment of the valve has been described it will apparent to those of ordinary skill in the art that numerous variations and modifications can be made without departing from the basic inventive concepts. For example the specific physical configuration and form of the hydraulic valves is not critical. Also one or more switches 15 may be provided that are operated by the motion of the spindle 84. For example a switch can be provided which, when operated by the spindle, activates a display or other indicator to indicate that the pump is supplying liquid to the outlet. All such variations and modifications together with those that would be obvious to those of ordinary skill in the art are deemed to be within the scope of the present invention the 20 nature of which is to be determined form the above description and the appended claims. 4226923_5 (GHMates) P90878.AU.1 11/04/13

Claims

1. A liquid supply control system comprising a first inlet, a second inlet, and an outlet; 5 a first hydraulic valve arranged to selectively open and close a first fluid path between the first inlet and the outlet; a second hydraulic valve arranged to selectively open and close a second fluid path between the second inlet and the outlet; the first and second valves arranged to cooperate with each other when the 10 outlet is open so that when one of the valves is shut the other valve is open.

2. The liquid supply control system according to claim 1 wherein the first and second valves are arranged so that when the outlet is shut both of the first and second valves are biased to shut. 15

3. The liquid supply control system according to claim 2 wherein the first and second valves are arranged so that when the outlet is shut the first and second valves are held shut by a common hydraulic pressure. 20

4. The liquid supply control system according to claim 3 comprising a fluid bleed path between the first and second valves enabling the first and second valves to be held shut by the common hydraulic pressure.

5. The liquid supply control system according to any one of claims 1 - 3 25 comprising a fluid bleed path between the first and second valves.

6. The liquid supply control system according to claim 4 or 5 comprising a bleed valve arranged to open and close the fluid bleed path wherein the bleed valve is controlled by the second valve. 30

7. The liquid supply control system according to claim 6 wherein the second valve is operatively associated with the bleed valve to cause the bleed valve to close the fluid bleed path when the second valve is open, and to open the fluid bleed path when the second valve is shut. 35

8. The liquid supply control system according to any one of claims 4 - 7 wherein each of the first and second valves comprises a movable diaphragm coupled with a 4226923_5 (GHMates) P90878.AU.1 11/04/13 - 12 corresponding pressure chamber and a valve seat, the valve seat providing communication between the corresponding inlet and the outlet, wherein the diaphragm is movable between a closed position in which the diaphragm bears on the seat and closes an associated fluid path between the corresponding inlet and outlet, and an 5 open position where the diaphragm is lifted from the seat to open the associated flow path, the diaphragm having one or more orifices to enable fluid communication between the associated inlet and corresponding pressure chamber; and wherein the fluid bleed path extends between respective pressure chambers. 10

9. The liquid supply control system according to claim 8 when appended directly or indirectly onto claim 6 comprising a mechanical actuator coupled between the diaphragm on the second valve and the bleed valve.

10. A liquid supply control system comprising: 15 a first inlet, a second inlet, and an outlet; a first hydraulic valve arranged to selectively open and close a first fluid path between the first inlet and the outlet; a second hydraulic valve arranged to selectively open and close a second fluid path between the second inlet and the outlet; and, 20 a bleed valve arranged to open and close a fluid bleed path between the first and second valves wherein the bleed valve is controlled by the second valve.

11. The liquid supply control system according to claim 10 wherein the second valve is operatively associated with the bleed valve to cause the bleed valve to close 25 the fluid bleed path when the second valve is open, and to open the fluid bleed path when the second valve is shut.

12. The liquid supply control system according to claim 10 or 11 wherein each of the first and second valves comprises a movable diaphragm coupled with a 30 corresponding pressure chamber and a valve seat, the valve seat providing communication between the corresponding inlet and the outlet, wherein the diaphragm is movable between a closed position in which the diaphragm bears on the seat and closes an associated fluid path between the corresponding inlet and outlet, and an open position where the diaphragm is lifted from the seat to open the associated flow 35 path, the diaphragm having one or more orifices to enable fluid communication between the associated inlet and corresponding pressure chamber; and wherein the fluid bleed path extends between respective pressure chambers. 4226923_5 (GHMates) P90878.AU.1 11/04/13 - 13

13. A liquid supply control system comprising: a first inlet, a second inlet, and an outlet; a first hydraulic valve arranged to selectively open and close a first fluid path 5 between the first inlet and the outlet; a second hydraulic valve arranged to selectively open and close a second fluid path between the second inlet and the outlet; and a fluid bleed path between the first and second valves, wherein the second valve is operable to close the fluid bleed path when the 10 second valve is in an open state wherein liquid entering the first inlet hydraulically closed the first valve and the first fluid path.

14. The liquid supply control system according to any one of claims 1 - 13 wherein the first inlet is arranged to connect to a mains water supply. 15

15. The liquid supply control system according to any one of claims 1 - 14 wherein the second inlet is arranged to connect to a pump configured to pump water from a water storage facility. 20

16. The liquid supply control system according to claim 15 comprising a sensor arranged to provide a signal to facilitate turning ON of the pump when the outlet is open, power is available to the pump and the water storage facility has at least a minimum level of water. 25

17. The liquid supply control system according to any one of claims 1 - 16 comprising a second valve bleed path between the second valve and the outlet.

18. The liquid supply control system according to claim 17 wherein the second valve bleed path provides fluid communication between the first valve and the outlet 30 when the fluid bleed path between the first and second valves is open. 4226923_5 (GHMates) P90878.AU.1 11/04/13