Special Features:

Installed in vapor plumbing as a safety device to relieve pressure or vacuum build up when vapor system is blocked during loading/unloading; 4 in. Ttma aluminum flange mounting; buna seals; vent consists of 1 body part no. Vrp3500-1, 1 basket base part no. Vrp3500-2, 1 gasket part no. Vrv3501-3, 1 bushing part no. Vrp3500-4, 1 spring retainer part no. Vrv3501-5, 1 shaft for vrp3500 part no. Vrp3501-6, 1 shaft for vrp3600 part no. 390552, 1 pin part no. Pin 3/16x1/s/ss, 1 spring part no. Sprg/l4506, 1 screw part no. Sc5/16ncx.75fss

Properties:

A valve designed to release under excessive pressure and/or excessive temperature by opening at a predetermined pressure and/or temperature. Thermostatically operated valves close when the pressure is relieved or the temperature is reduced. Fusible plug valves require replacement of the plug. See also valve, safety relief and valve, regulating. Temperature.