Kunkle 911 Safety Relief Valve — 1″ x 1-1/2″ NPT, F Orifice (Steam ASME Section VIII, Metal Seat)
SKU: KUN-911-FM-L-1X1_1_2
The Kunkle 911 is a full-nozzle safety relief valve with all-stainless construction for cryogenic and corrosive service, built for air and gas compressors, liquid-filled pressure vessels, steam systems and vacuum service. This 1″ x 1-1/2″ NPT variant — F orifice, 0.337 in² — is available across a 3–700 PSI range for Steam ASME Section VIII service with a metal seat, carrying ASME Section VIII (UV stamp), National Board Certified. Temperature range -320°F to 800°F; threaded side outlet allows piped-off discharge to eliminate fugitive emissions. Specify your required set pressure when requesting a quote.
Specifications
| Body Material | Stainless Steel (SA351-CF8M) |
| Trim Material | Stainless Steel (316) |
| Inlet Size | 1" NPT |
| Outlet Size | 1-1/2" NPT |
| Outlet Configuration | Side outlet |
| Orifice Designation | F |
| Orifice Area | 0.337 in² |
| Set Pressure | 3–700 PSI |
| Temperature Range | -320°F to 800°F |
| Capacity — Steam VIII | 242–11954 |
| Flow Coefficient | 0.878 |
| Service Media | Steam |
| ASME Certification | ASME Section VIII (UV stamp), National Board Certified |
| National Board Certified | Yes |
| Seat Type | Metal |
| Weight | 6 lb |
| Overall Height | 8-3/4 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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