| 摘要 |
A surge pressure control valve for blocking surge pressures that may occur in a fluid line. This surge pressure control valve contains a fluid biased plunger therein that retracts upon the application of fluid pressure. However, the rate of retraction of this plunger is limited to the rate at which the fluid bias is released by flowing through a relief opening controlled by a needle valve. As this plunger is allowed to retract, it uncovers a passageway connecting the inlet port to the outlet port, thereby permitting fluid to flow through the valve. By such construction, this plunger does not react immediately to the application of pressure, instead, the plunger only gradually retracts (thereby only gradually uncovering the passageway) after fluid is first forced through the relief opening. Thus, this plunger serves the purpose of dampening the effect of any surge pressure that may arise in the line.
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