Kunkle 6252 Safety Valve — 6″ 250# Flange x 8″ 125# Flange, R Orifice (Steam ASME Section I, Metal Seat)
SKU: KUN-6252-RM-A-FLG-6X8
The Kunkle 6252 is a heavy-duty cast iron safety valve with a stainless steel semi-nozzle, trim and disc, built for steam boilers and generators, pressure reducing stations, air and gas compressors, and pressure vessels including tanks, receivers, intercoolers and separators. Dual control rings allow precise adjustment of simmer and blowdown; the bolted bonnet makes field maintenance straightforward. This 6″ 250# Flange x 8″ 125# Flange variant — R orifice, 17.600 in² — covers a 15–250 PSI set pressure range for Steam ASME Section I service with a metal seat, carrying ASME Section I (V stamp), National Board Certified. Temperature range -20°F to 406°F. Per ASME, code valves with a cast iron A126 body may not be used in lethal or flammable service. Specify your required set pressure when requesting a quote.
Specifications
| Body Material | Cast Iron (A126 Cl. A or B) |
| Trim Material | Stainless Steel (SA351 CF8M semi-nozzle, 316 SS disc) |
| Inlet Size | 6" 250# Flange |
| Outlet Size | 8" 125# Flange |
| Outlet Configuration | Side outlet |
| Orifice Designation | R |
| Orifice Area | 17.600 in² |
| Set Pressure | 15–250 PSI |
| Temperature Range | -20°F to 406°F |
| Capacity — Steam I | 25227–216622 |
| 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 | 507 lb |
| Overall Height | 39-1/8 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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