PRESSURE-CONTROL PLUNGER-TYPE VALVE MECHANISM

When the pressure in passage 1 exceeds the preset value, controlled by the setting of the helical spring, hollow plunger 2 is pushed downward, compressing the spring and allowing surplus fluid to flow through slits in the plunger and port 4 into the receiver. The spring is regulated by screw 3.
$3602$SHP,Va$