A bidirectional diaphragm valve is presented in which the flat, disk shaped diaphragm formed of elastomeric material is biased against the valve seat by means of a plunger which is not attached to the diaphragm.Bellow Seal Valve The diaphragm is clamped between the valve body and a bonnet member providing compression and confinement of the perimeter of the diaphragm, resulting in radial compression of the diaphragm which is expressed inwardly as the expansion and buckling of the central portion of the diaphragm whereby the valve opens passively in response to pressure from the flow medium when the plunger is retracted. BALANCING VALVESThe preferred embodiment of the valve is of miniature size and compact configuration adapted for use in multi-valve banks and all parts having wetted surfaces are formed of materials of suitable chemical inertness compatible with the fluid media.Ball Valves

A diaphragm valve comprising:
A. valve body means defining a first flow passage, a second flow passage and a valve seat means between the first and second flow passages;

B. diaphragm means comprised of an elastomeric material sealingly engageable with the valve seat means to prevent passage of fluid between the first and second flow passages;

C. retractable means for releasably biasing the diaphragm means against the valve seat means to sealingly engage therewith and control the flow of fluid through the valve; and

D. means for subjecting the diaphragm means to radial compression sufficient to cause the diaphragm means to disengage from the valve seat means when the biasing means is

retracted.

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