Kunkle 921 Safety Relief Valve — 1″ x 1-1/2″ NPT, F Orifice (Forced Flow Steam ASME Section I, Metal Seat)
SKU: KUN-921-FM-R-1X1_1_2
The Kunkle 921 is a full-nozzle carbon steel safety relief valve built specifically for forced-flow steam generators, carrying the ASME Section I ‘V’ stamp. Supplied with a plain lift lever, required for ASME steam service above 140°F. This 1″ x 1-1/2″ NPT variant — F orifice, 0.337 in² — covers a 15–700 PSI set pressure range on steam service with a metal seat. Body is carbon steel (SA216 Gr. WCB) with 316 stainless trim and a hard chrome plated disc holder; temperature range -20°F to 800°F. Overall height shown is for the plain lift lever configuration; add 1-1/4 in for set pressures above 200 PSI. Specify your required set pressure when requesting a quote.
Specifications
| Body Material | Carbon Steel (SA216 Gr. WCB) |
| Trim Material | Stainless Steel (316), hard chrome plated disc holder |
| Inlet Size | 1" NPT |
| Outlet Size | 1-1/2" NPT |
| Outlet Configuration | Side outlet |
| Orifice Designation | F |
| Orifice Area | 0.337 in² |
| Set Pressure | 15–700 PSI |
| Temperature Range | -20°F to 800°F |
| Capacity — Steam I | 483–11207 |
| Flow Coefficient | 0.878 |
| Service Media | Steam |
| ASME Certification | ASME Section I (V stamp), National Board Certified |
| National Board Certified | Yes |
| Seat Type | Metal |
| Weight | 6 lb |
| Overall Height | 9-7/8 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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