Abstract
Sealing and lubricating between main spool and sleeve of the pressure relief valve,caused by low viscosity and poor lubrication of water,are vital technical problems affecting the static and dynamic performance of the relief valve.In this paper,a new pilot pressure relief valve using diaphragm seal is designed which can solve the sealing and lubrication problems.The mathematical model of the valve was established to theoretically analyze the static properties and the dynamic properties.The effect of the lower chamber of the valve,orifice diameter,stiffness of the pilot valve spring,the upper chamber of the valve,the spool quality on the dynamic performances of the valve such as the stress response and stress overshoot was studied.A prototype was produced to finish the experimental study including the pressure range,opening and closing characteristics and dynamic properties.The results shows that the prototype has a large range of pressure regulation,fine opening and closing feature,small pressure overshoot and short rise-time.This valve can better solve the sealing and lubrication problem between the main spool and the sleeve.
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