A pilot-operated precision overflow valve
An overflow valve and pilot-operated technology, applied in the direction of fluid pressure actuators, servo motor components, mechanical equipment, etc., can solve the problems of restricting wide application, increased overflow pressure, poor flow characteristics, etc., and achieve good flow characteristics , high voltage regulation accuracy, and good voltage regulation characteristics
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[0013] The present invention will be further explained below.
[0014] 1. Setting of overflow pressure
[0015] Under the condition that the upstream pressure of the relief valve is stable, the upstream pressure is p set , The outlet pressure of the precision reducing valve (2) is p 2 (Pilot pressure), the active area of the upper diaphragm (3) is A 1 , The active area of the lower diaphragm (4) is A 2 . The gravity of the spool (7) and the force generated by the soft spring (6) are basically offset, and its magnitude is negligible.
[0016] From the force balance equation of the double-layer diaphragm structure:
[0017] p set A 1 = P 2 A 2
[0018] Get: p set = A 2 A 1 p 2
[0019] p set It is the set value of overflow pressure, which is determined by p 2 determine. Set p by adjusting the knob ...
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