BoilerSupplies.com stocks Kunkle safety and relief valves for boilers and steam systems, including the Model 20, 215V, 300, 537, 910, 6252 and Series 6000, plus the Model 299 drip pan elbow. Boiler technicians buy them to replace a valve that weeps, chatters or is past its test date. Read the nameplate on the old valve first: model number, inlet size, set pressure, capacity and service (steam, air or water). Match those and order, or send the details for a quote.
Kunkle Valve is an Emerson brand of safety and relief valves for steam, air, gas and liquid service. A Kunkle safety valve opens at its set pressure and vents a boiler, pressure vessel or steam line before pressure climbs past the vessel's rating.
BoilerSupplies.com carries Kunkle Model 20, 215V, 300, 337, 537, 910, 911, 912, 913, 930 and 6252 safety valves and the Series 6000 line. The Model 299 drip pan elbow fits the outlet of a steam safety valve, keeps the discharge pipe weight off the valve body and drains condensate. The models differ by body material, inlet size, set pressure range, capacity and the service the valve is built for: steam, air, gas or water. A replacement is picked by matching those to the nameplate on the old valve, not by fitting a valve that looks the same.
Key facts
Is a Kunkle safety valve the same as a safety relief valve, pop valve or safety blowoff valve?
Yes: safety valve, safety relief valve, pop valve and safety blowoff valve all name the same family of Kunkle valves on BoilerSupplies.com. A safety valve or pop valve opens fully at set pressure, the usual choice on steam. A relief valve opens in proportion to pressure, the usual choice on liquid. A safety relief valve does either job. Safety blowoff valve is the older steam term.
What do you need from me to get the right Kunkle valve?
The nameplate on the old valve, or a clear photo of it. It carries the model number, inlet and outlet size, set pressure, capacity and the service the valve was built for. Add the boiler or vessel it protects and its maximum allowable working pressure. With those, BoilerSupplies.com can match the model or quote the closest current one.
Can I set a Kunkle safety valve to a different pressure?
No. A Kunkle safety valve is set and sealed at the pressure stamped on its nameplate, and the seal shows it has not been changed since it was set. Order the valve at the set pressure the boiler or vessel needs. If the set pressure on the old valve no longer matches the system, send both numbers with the quote request.
What is a Kunkle Model 299 drip pan elbow for?
The Kunkle Model 299 drip pan elbow connects a steam safety valve outlet to the discharge pipe. It carries the weight and thermal movement of the discharge pipe on its own support instead of on the valve body. Its drain lets condensate out so it does not sit on the valve seat. Order it by the valve outlet size.
How do I know my Kunkle safety valve needs replacing?
A Kunkle safety valve needs replacing when it weeps or simmers below set pressure, fails to lift at set pressure on a manual test, or does not reseat cleanly after lifting. A cut seat, a broken spring or a seized stem usually means a new valve is the faster fix on a steam boiler. Match the nameplate and order the replacement before the next inspection.
Send the nameplate details, or a photo of the nameplate, and the quantity through BoilerSupplies.com, or call 1-770-957-9599 or toll free 1-800-780-3776.
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