Disclosed herein is an improved valve for regulating the flow of fluids. The valve includes a housing defining, in part, a flow passageway having a port surrounded by a valve seat. BALANCING VALVESA diaphragm is mounted within the housing and assists in completing the flow passageway. The diaphragm is movable between a first position to cause closing of the port and a second position to cause opening of the port.Bellow Seal Valve A spring having an end with a diameter larger than the port is operatively engaged with the diaphragm urging the diaphragm to close the port. A suction force operates on the same side of the diaphragm as the spring creating a pressure differential on opposite sides of the diaphragm. The pressure differential is effective to overcome the action of the spring, thereby displacing the diaphragm to an open position and allowing flow of fluid through the port.

A valve for controlling flow in response to downstream pressure variation, said valve including a housing having means at least partially defining a flow passageway having a port surrounded by a valve seat, said port separating an upstream portion of said flow passageway from a downstream portion, a diaphragm supported by said housing, cooperating with said housing to define said flow passageway, and being movable relative to said port between a port closing position and a port opening position, said diaphragm including a first side subject to the pressure condition in said downstream passageway portion and a second side subject, in part, to the pressure condition in said upstream passageway portion, a spring having an end with a diameter larger than said valve seat, and a support member interposed between said diaphragm and said spring and including a central portion extending inwardly of the adjacent end of said spring in spaced relation to said diaphragm and an outer portion extending radially outwardly from the periphery of said central portion and engaged with said spring and said diaphragm, whereby to locate said diaphragm in said port closing position in the absence of a pressure differential between said upstream and downstream passageway portions, whereby, when said downstream passageway portion is subject to a pressure condition less than the pressure condition in said upstream portion,Forged Steel Valves such pressure differential produces a first force which acts in opposition to said spring and so as to urge said diaphragm toward said port opening position, and whereby, when the pressure condition in said downstream passageway portion is higher than the pressure condition in said upstream passageway portion, such pressure differential produces a second force acting counter to said first force and in common with said spring so as to urge said diaphragm toward said port closing position.

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