Kunkle relief valves are some of the most common Boiler Steam Safety Valves on the market. Industry people may also call them Knuckle valves. We can provide valves with many different set pressures for almost any application. If you don't see what you need here, just let us know. This is only a small offering of what we provide in terms of Safety Relief Valves. We can custom set the pressure of the relief valves as well.