A high pressure butterfly valve having a pressure actuatable valve element that is flexed by fluid pressure to enhance the sealing ability of the valve in direct proportion to the pressure of the fluid controlled by the valve.BUTTERFLY VALVES The butterfly valve of this invention incorporates an annular seat element retained within the valve body by an upper valve actuating stem and a lower trunnion. Check ValvesA concavo-convex butterfly valve element is rotatably carried by the trunnion and valve actuating stem with the convex surface thereof facing upstream in the closed position. The valve element is capable of flexing responsive to application of fluid pressure in this manner as to expand the peripheral sealing surfaces thereof and enhance the mechanical sealing pressure as fluid pressure increases. Safety Valves The butterfly element also floats relative to the trunnion and valve stem thereby allowing the valve element to float or self-align itself to obtain optimum sealing engagement as pressure is applied by the fluid controlled by the valve.

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