A fluid flow-controlling valve comprising valve body, a central cylindrical bore in said body with one end thereof being the normal valve inlet and the other end the normal valve outlet,Automatic Control Valves a valve seat extending around said bore, a hollow cylindrical relief valve element coaxial with and arranged for axial displacement within said bore, said relief valve element having an axial passage therein, an end wall at one end of said relief valve element extending transversely of the passage thereof, the other end of said relief valve element passage being open, a groove extending around the outside of said relief valve element, an O-ring seal in said groove, a coil spring for biasing said relief valve element to seat said seal on said valve seat and yieldably oppose reverse flow through said valve, said relief valve element being displaced against the bias of said spring to unseat said O-ring seal from said valve seat in response to an outlet pressure which exceeds the inlet pressure by a first predetermined value whereby fluid may flow from said valve outlet to said valve inlet, an opening extending through said end wall of said relief valve element,WATER POWER CONTROL VALVE an elastomeric check valve element carried by said end wall and including a supporting portion projecting through said end wall to the interior of said passage and cooperable with said opening to permit fluid flow from the valve inlet to the valve outlet when the inlet pressure exceeds the outlet pressure, and a second valve seat for said O-ring seal spaced from said first-mentioned seat and against which said O-ring seal is seated when the outlet pressure exceeds the inlet pressure by a second predetermined value which is greater than said first predetermined value to thereby cooperate with said check valve to block flow through the valve in both directions.

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2011-12-19

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