Pressure isolated pilot check valve

Details Pressure isolated pilot check valve Pressure isolated pilot check valve

1995-05-03

1997-09-16

Hepperle, Stephen M.

Fluid handling

Line condition change responsive valves

With separate connected fluid reactor surface

137495, F16K 1704

Patent

active

056669933

ABSTRACT:
An improved check valve for selectively controlling the flow of fluid through a valve seat. A spring biases a plunger against the valve seat when the fluid is stationary. Movement of the fluid pushes the valve plunger against the spring to open the aperture of the valve seat. An actuator selectively exerts a force against the plunger to close the plunger against the valve seat. In one embodiment of the invention, the actuator directs a pressurized fluid against a second end of the plunger, and a seal prevents leakage of such fluid toward the plunger first end in contact with the valve seat. A cavity between the seal and the plunger first end can be vented to the atmosphere to maintain the pressure differential created by the pressurized fluid against the plunger second end.

REFERENCES:
patent: 1173518 (1916-02-01), Hoxsie
patent: 3410304 (1968-11-01), Paul
patent: 5165443 (1992-11-01), Buchanan
patent: 5218991 (1993-06-01), Gray

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