Relief Valve

Relief Valve (RV)

Relief valves are for utilization in reciprocating engine exhaust systems to minimize damage caused by engine backfire. They are commonly used to protect exhaust systems where factory-insulated engine exhaust silencers, catalytic converters and/or waste heat recovery units are used. Relief valves are set to open at exhaust pressure exceeding approximately one (1) PSIG (27.7” of water column). An optional additional tension spring is available to increase opening pressure to approximately 48.5” W.C. or greater. Relief valves are recommended in accordance with NFPA 37.

I.D. A B # of springs in mm in mm in mm 6 152 9.625 244 11.00 279 1 8 203 12.250 311 13,500 343 1 10 254 14.000 356 16.000 406 1 12 305 16.750 425 19.000 483 2 14 356 18.250 464 21.000 533 2 16 406 20.250 514 23.500 597 3 18 457 22.250 565 25.000 635 3 20 508 24.250 616 27.500 699 4 22 559 26.250 667 29.000 737 4 24 610 28.500 724 32.000 813 4