Elastomeric element valve

A fluid control valve comprising:

• a valve body having a fluid inlet, a fluid outlet, and a fluid passageway therebetween;
• a cage member having a cage interior for receiving fluid at one cage end and a cap at the other cage end having cap openings in fluid communication with said cage interior;
• said cage member mounted within said valve body fluid passageway for passing fluid from said valve body fluid inlet through said cage interior, continuing through said cap openings to said valve body fluid outlet;
• a flexible diaphragm mounted in said valve body and flexibly movable from adjacent said cap openings to away from said cap openings in controlling the flow of fluid between said valve body fluid inlet and fluid outlet;
• and
• said flexible diaphragm including a formed concave portion around the entire perimeter of said diaphragm, said formed concave portion straightening and becoming a convex portion around said perimeter as said flexible diaphragm is moved away from said cap openings to flex said diaphragm to a substantially dome-shaped fully open position away from said cap openings to increase the fluid flow capacity of said valve.