Swagelok’s new RHPS series PRV model proportional relief valves offer proportional venting of overpressures for piping systems up to 1in size. End connections include NPT female, BSPP female, and BSPP male in sizes 1/4, 1/2, 3/4, and 1in. Available Swagelok threaded adapters convert from BSPP to NPT to allow for easy product installation. Valve operation opens gradually and reseats accurately in proportion to the increase and decrease in pressure over the set opening pressure. The PRV’s balanced valve design is unaffected by system back pressure up to 50% of the valve’s set pressure. PRV proportional relief valves feature 316L stainless steel construction of the body, trim, and spring housing. Available set pressure ranges are: 145 to 580psig, 580 to 1160psig, 1160 to 2170psig, 2170 to 4060psig, and 4060 to 5800psig. Depending on body size selected, flow coefficients (Cv) range from 0.49 to 4.36. All valves are factory-tested, set, and secured with a lock-wire to the pressure range desired. Each valve is tested for specified reseating and shipped with a test certificate. Operating temperature range is -4 to 176F.