Relief valve
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United States of America Patent
Stats
-
Sep 24, 1991
Grant Date -
N/A
app pub date -
May 23, 1990
filing date -
May 23, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to relief valves, and is drawn to a relief valve that alleviates the rise in the relief pressure, by the compression of a main spring via a moving spring receiving member, due to the introduction of hydraulic pressure at the supply side into a fluid chamber at the rear of a movable spring member. Moreover, an adjustment spring to urge the moving body and to assist the main spring is provided within a fluid chamber, and the urging force of this adjustment spring can be adjusted by the operation of a changing member provided externally of the valve. Thus, the set pressure of the relief valve can be easily and readily changed, and also a fine adjustment of the set pressure can be effected.
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