Kunkle 918 Safety Relief Valve — 1/2″ x 3/4″ NPT, D Orifice (Liquid ASME Section VIII, Buna-N (NBR) Seat)
SKU: KUN-918-DB-J-1_2X3_4
The Kunkle 918 is a full-nozzle safety relief valve with bronze body and bonnet and a resilient soft seat, giving superior leak-free performance versus a metal seat. This 1/2″ x 3/4″ NPT variant — D orifice, 0.121 in² — is available across a 15–300 PSI range for Liquid ASME Section VIII service with a Buna-N (NBR) seat, carrying ASME Section VIII (UV stamp), National Board Certified. Temperature range -30°F to 250°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.
Specifications
| Body Material | Bronze (B584 Alloy 84400) |
| Trim Material | Brass (B16), 316 SS disc |
| Inlet Size | 1/2" NPT |
| Outlet Size | 3/4" NPT |
| Outlet Configuration | Side outlet |
| Orifice Designation | D |
| Orifice Area | 0.121 in² |
| Set Pressure | 15–300 PSI |
| Temperature Range | -30°F to 250°F |
| Capacity — Liquid (GPM) | 14–60 |
| Flow Coefficient | 0.710 |
| Service Media | Liquid |
| ASME Certification | ASME Section VIII (UV stamp), National Board Certified |
| National Board Certified | Yes |
| Seat Type | Buna-N (NBR) |
| Weight | 3 lb |
| Overall Height | 7-1/4 in |
Need a quote or have a technical question?
Call (324) 888-1524 or submit a quote request online. Requests received before 3 PM ET are typically quoted the same business day.
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