DOWNHOLE PRESSURE RELIEF VALVE FOR WELL PUMP

摘要

A well pump assembly has a pressure relief valve in the tubing string for avoiding excessive discharge pressure on a progressing cavity pump. The pres sure relief valve is mounted in the string of tubing downstream of the pump. The valv e assembly has a main flow passage through it for fluid being pumped by the pump through the tubing. The valve assembly has a valve seat and a spring-biased valv e element which is urged by the spring against the downstream end of the valve sea t to maintain the valve seat closed. The upstream end of the valve seat is in communication with the pressure in the tubing. If the tubing pressure exceeds a selected level, the valve element moves to an open position, discharging well fl uid into the casing.