Special Features:

Installed in vapor plumbing as safety device to relieve pressure or vacuum build up when vapor system is blocked during loading/unloading; 4 in. Ttma aluminum flange mounting; opens at 1.5 in. Hg. Vacuum; consists of 1 body part no. Vrv3501-1, 1 gasket base part no. Vrv3501-2, 1 gasket part no. Vrv350-3, 1 bushing part no. Vrv3501-4, 1spring retainer part no. Vrv3501-5, 1 shaft part no. Vrv3501-6, 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.