Kunkle 917 Safety Relief Valve — 1″ x 1″ NPT, D Orifice (Air/gas ASME Section VIII, Viton (FKM) Seat)

The Kunkle 917 is a full-nozzle safety relief valve with all-stainless construction and a resilient soft seat, giving superior leak-free performance versus a metal seat. This 1″ x 1″ NPT variant — D orifice, 0.121 in² — is available across a 3–1400 PSI range for Air/gas ASME Section VIII service with a Viton (FKM) seat, carrying ASME Section VIII (UV stamp), National Board Certified. Temperature range -10°F to 400°F, set by the seat material. Neoprene, Silicone, Kalrez®, Aflas® and HNBR seats are also available — ask when requesting a quote. Threaded side outlet allows piped-off discharge to eliminate fugitive emissions.