Valve seal breakaway device

Details Valve seal breakaway device Valve seal breakaway device

1985-05-02

1986-05-27

Schwadron, Martin P.

Valves and valve actuation

With non-fluid retarder

251 62, 92 85A, F16K 2900, F16K 31363, F01B 1102

Patent

active

045911290

ABSTRACT:
A spool valve has a seal-carrying spool movable in a valve bore terminated at one end by an end wall. A stem projects toward the end wall from an end of the spool. A hollow cylinder member is mounted coaxially on the stem via a radially inwardly extending flange which slidably receives the stem. A spring is coaxially mounted on the stem and is biased to urge the cylinder member away from the spool. A stop near the end of the stem retains the cylinder member on the stem and maintains a minimum preload in the spring. When the spool is in a position near the end wall, the end wall engages the cylinder member and moves it away from the stop, thereby compressing the spring so that the spring will be biased to move the spool away from the end wall.

REFERENCES:
patent: 3194497 (1965-07-01), Thorburn
patent: 3825033 (1974-07-01), Hayner

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