Water valve with supported opening function

Abstract

Water valves and methods of regulating fluid flow for low ambient pressure water sources that reduce the amount of filtration needed for valve mechanisms operating in the water source.

1 . A water valve comprising:
 a chamber defining an inlet and an outlet;   an anchor disposed in the chamber;   a pull element engaged with the anchor;   a sealing cylinder engaging the pull element;   a membrane with a proximal surface facing toward the inlet and a distal surface facing away from the inlet, wherein the membrane defines a central cavity, that engages the sealing cylinder, and a continuous substantially radial surface surrounding and extending from the central cavity;   in an anchor first position the pull element closes a small valve seat defined in the sealing cylinder and water flows through a bypass channel to engage the distal surface of the membrane;   in an anchor second position, displacement of the anchor moves the pull element to open the small valve seat and water flows through the small valve seat through an interior of the sealing cylinder and out via the outlet; and   in an anchor third position, the sealing cylinder is displaced by the pull element and opens a main valve seat such that water flows substantially from the inlet through the outlet.   
     
     
         2 . The water valve of  claim 1 , wherein in the anchor third position, water flows substantially from the inlet through the outlet while flow reduces through the small valve seat. 
     
     
         3 . The water valve of  claim 1 , wherein in the anchor third position, water flows substantially from the inlet through the outlet without passing through a filter. 
     
     
         4 . The water valve of  claim 1 , wherein the sealing cylinder is at least partially encircled by a filter. 
     
     
         5 . The water valve of  claim 4 , wherein only water passing through the filter at least partially encircling the sealing cylinder contacts the distal surface of the membrane. 
     
     
         6 . The water valve of  claim 4 , wherein only water passing through the filter at least partially encircling the sealing cylinder flows through the small valve seat and out the outlet. 
     
     
         7 . The water valve of  claim 1 , wherein the membrane is flexible. 
     
     
         8 . The water valve of  claim 1 , wherein a diameter of the bypass is smaller than a diameter of the small valve seat. 
     
     
         9 . The water valve of  claim 1 , wherein only the central cavity extends through the membrane. 
     
     
         10 . A method of regulating fluid flow comprising:
 forming a housing with an inlet and an outlet for a fluid stream;   placing a membrane in the housing with a proximal face directed toward the inlet and a distal face directed away from the inlet;   forming a control flow pathway in the housing that exerts pressure on the distal surface of the membrane while preventing fluid from exiting via the outlet;   positioning a movable member in the housing that influences the control pathway, wherein repositioning the movable member opens a first valve seat that allows the fluid stream to exit the control flow pathway; and   further positioning the movable member to open a second valve seat, wherein opening the second valve seat allows fluid to flow from the inlet to the outlet and bypass the control pathway.   
     
     
         11 . The method of  claim 10 , when the second valve seat is open, fluid flows from the inlet through the outlet without passing through a filter. 
     
     
         12 . The method of  claim 10 , further including positioning a sealing cylinder in the housing that is at least partially surrounded by a filter. 
     
     
         13 . The method of  claim 12 , wherein only water passing through the filter at least partially surrounding the sealing cylinder contacts the distal surface of the membrane. 
     
     
         14 . The method of  claim 12 , wherein only water passing through the filter at least partially encircling the sealing cylinder flows through the first valve seat valve seat and out the outlet. 
     
     
         15 . The method of  claim 10 , wherein the membrane is flexible. 
     
     
         16 . The method of  claim 10 , wherein a diameter of the control pathway at an entrance of the control pathway is smaller than a diameter of the first valve seat. 
     
     
         17 . The method of  claim 10 , wherein only a single passage extends through the membrane.