Kunkle 6121 Safety Relief Valve — 1-1/2″ NPT, H Orifice (Steam ASME Section I, Teflon PFA Seat)
SKU: KUN-6121-HT-A-1_1_2
The Kunkle 6121 is a top-outlet, full-nozzle bronze safety relief valve with a Teflon (PFA) disc insert, for steam service only. This 1-1/2″ NPT inlet variant — H orifice, 0.863 in² — is available across a 15–250 PSI set pressure range for Steam ASME Section I service, carrying ASME Section I (V stamp), National Board Certified. The PFA disc provides tight, leak-free shutoff for steam applications. Body: bronze (BRZ B584-C84400); top outlet configuration with dual control rings for precise blowdown adjustment. Specify your required set pressure when requesting a quote.
Specifications
| Body Material | Bronze (BRZ B584-C84400) |
| Trim Material | Brass (BRS B283-C48500), Teflon (PFA) disc insert |
| Inlet Size | 1-1/2" NPT |
| Outlet Size | Top outlet — contact for sizing |
| Outlet Configuration | Top outlet |
| Orifice Designation | H |
| Orifice Area | 0.863 in² |
| Set Pressure | 15–250 PSI |
| Temperature Range | Per PFA seat — contact for rating |
| Capacity — Steam I | 1237–10622 |
| Flow Coefficient | 0.878 |
| Service Media | Steam |
| ASME Certification | ASME Section I (V stamp), National Board Certified |
| National Board Certified | Yes |
| Seat Type | Teflon (PFA) |
| Weight | 7-1/4 lb |
| Overall Height | 10-5/8 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.
Get a Quote