Valves and valve actuation – Fluid actuated or retarded – Piston type expansible chamber reciprocating valve actuator
Patent
1995-06-30
1997-05-27
Nguyen, Hoang
Valves and valve actuation
Fluid actuated or retarded
Piston type expansible chamber reciprocating valve actuator
251 636, F16K 31143, F16K 31163
Patent
active
056324669
ABSTRACT:
A valve includes a housing having an inlet and an outlet for the flow of a first fluid therethrough. A cup-shaped cover dome is attached to the housing. The cover dome has a cylindrical bore. A valve stem has a plug to regulate the flow of the first fluid through the housing. A piston is connected to the valve stem. The piston is reciprocatably received within the cylindrical bore of the cover dome to define a first chamber disposed between the piston and the housing and a second chamber disposed between the piston and the cover dome. The piston has a sliding circumferential surface received in an inner surface of the cylindrical bore. The sliding circumferential surface is adapted to fuse with the inner surface of the bore at a predetermined fused temperature, so that the piston fuses with respect to the cylinder along the sliding circumferential surface thereby effectively creating a gas-tight permanent closure between the first chamber and the second chamber, thereby preventing the first fluid from escaping from the first chamber into the second chamber.
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