PRESSURE-CONTROL PLUNGER-TYPE VALVE MECHANISM

When the pressure of the fluid in port 1 exceeds the preset value, controlled by the setting of the helical spring, plunger 2 is lifted, compressing the spring and allowing surplus fluid to flow out through holes in the plunger and port 4 into the receiver. The spring is regulated by threaded member 3.
$3604$SHP,Va$