Relief valve
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United States of America Patent
Stats
-
May 28, 2019
Grant Date -
Oct 5, 2017
app pub date -
Nov 11, 2015
filing date -
Nov 19, 2014
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A relief valve includes a housing including an internal flow passage through which a working fluid flows, and a relief port discharging the working fluid from the internal flow passage, and a valve body including a first pressure-receiving portion a second pressure-receiving portion receiving pressure with a pressure-receiving area that is larger than a pressure-receiving area of the first pressure-receiving portion, and a first recessed portion formed at the second pressure-receiving portion at an opposite side relative to a pressure-receiving surface of the second pressure-receiving portion and including a closed-end cylindrical shape. The relief valve includes a biasing force adjustment mechanism including a spring of which one end is held at the first recessed portion, a support portion retaining the other end of the spring and including a closed-end cylindrical shape, and a motor adjusting a rotational angle and causing the support portion to reciprocate.
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Cited Art Landscape
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