Cryogenic reciprocating pump
First Claim
1. A reciprocating pump for cryogenic fluids, said pump comprising a cylinder sleeve, head, intake valve, discharge valve, and reciprocating piston, said piston including a mechanical spring energized seal having a generally U-shaped jacket and a heliacal spring in the bite of the U for mechanical spring-energized sealing in both suction and compression, said U-shaped jacket defining a continuous circular seal with a U-shaped cross-section, including legs having disconnected ends and closed ends, said legs circumferentially parallel to said cylinder sleeve and said disconnected ends forming an opening into said U-shape, said opening directed away from said head so that pressure differential during suction expands said disconnected ends so that said seal is acts primarily to seal in suction.
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Accused Products
Abstract
A novel reciprocating pump for cryogenic fluids. The pump has a cylinder sleeve, head, intake valve, discharge valve, and a reciprocating piston including a mechanical spring energized seal having a generally U-shaped jacket and a helical spring in the bight of the U.
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Citations
9 Claims
- 1. A reciprocating pump for cryogenic fluids, said pump comprising a cylinder sleeve, head, intake valve, discharge valve, and reciprocating piston, said piston including a mechanical spring energized seal having a generally U-shaped jacket and a heliacal spring in the bite of the U for mechanical spring-energized sealing in both suction and compression, said U-shaped jacket defining a continuous circular seal with a U-shaped cross-section, including legs having disconnected ends and closed ends, said legs circumferentially parallel to said cylinder sleeve and said disconnected ends forming an opening into said U-shape, said opening directed away from said head so that pressure differential during suction expands said disconnected ends so that said seal is acts primarily to seal in suction.
Specification