Two-way hydraulic valve with one way time delay
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United States of America Patent
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Apr 27, 1993
Grant Date -
N/A
app pub date -
Nov 21, 1991
filing date -
Nov 21, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A two-way, inline, hydraulic valve through which fluid can flow in reverse and in forward directions has a reverse flow passage including a check valve preventing forward direction fluid flow therethrough. Forward direction fluid flow is controlled by a movable, spring-biased, normally closed, spool valve having one end exposed to forward direction fluid pressure and an opposite end forming a piston acting in a cylindrical cavity containing a volume of fluid. Movement of the spool valve to open position in response to forward direction fluid pressure sufficient to overcome the spring bias causes the volume of fluid to be forced from the cavity through a restricted passage, thereby providing a time delay in the opening of the two-way valve for forward direction fluid flow. In an alternative embodiment, a sleeve valve mounted on the spool valve provides a by-pass permitting forward direction fluid flow under abnormally low forward direction fluid pressure.
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