A housing; at least one valve seat disposed in said housing;API Cast Steel Valves a diaphragm having two opposing surfaces mounted in said housing, one of said two opposing surfaces resting against said valve seat; a pressure medium space concentrically surrounding said valve seat; a first control pressure chamber between said housing and one side of said diaphragm along an area of said diaphragm between said pressure medium space and a perimeter of said diaphragm;Needle & Gauge Valves said first control pressure chamber being operable for moving said diaphragm by one of curvature actuation and radial flip-over actuation in response to a pressure medium in said first control pressure chamber such that said diaphragm moves away from said circular valve seat, thereby opening said valve seat.

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