Patent ID: 6250329
Filing Date: 2001-06-26
Classification: F16K,Y10T

Abstract:
A valve that controls the flow of a corrosive fluid and responds to a pre-determined pressure of said fluid flowing into the valve, includinga body member having a passageway with an inlet and an outlet, said passageway having an internal surface made of a fluorocarbon polymer,a port along the passageway between the inlet and the outlet,a plug having a first position where said plug is seated in the port to close the valve and an second position where said plug is withdrawn from the port to open the valve, said plug comprising a pair of stacked together flexible diaphragms, one diaphragm having a surface in contact with the fluid, said surface being made of a fluorocarbon polymer, anda disc spring engaging the plug, said disc spring having a first position holding the plug in the port when the pressure of the fluid is below said pre-determined pressure and a second position withdrawing the plug from the port when the pressure of the fluid exceeds said pre-determined pressure.