How to find the right Relief Valves AI guide
Written by an AI model from its trained knowledge.
What the AI looks for in Relief Valves
- Set pressure
- Set pressure must not exceed the maximum allowable working pressure of the protected vessel or system. The valve's job is to open before the equipment fails.
- Relieving capacity
- The rated capacity must be at least the maximum output of the source (compressor, boiler, pump) at set pressure. An undersized valve opens but cannot hold pressure down.
- Code stamp
- Use ASME-stamped safety valves on air receivers, boilers and pressure vessels. Required by code and insurers.
- Water heater T&P
- Residential water heaters use a temperature-and-pressure relief valve, typically rated 150 psi and 210°F, listed to ANSI Z21.22/CSA 4.4, sized for the heater's input. It protects against both overtemperature and overpressure.
- Installation
- Never reduce inlet or outlet size, and pipe the discharge full size to a safe location with no valve or cap. Restrictions cut capacity and can stop the valve from relieving.
Brands that matter
- Kingston Valves: Air compressor safety and relief valves.
- Control Devices: Compressor and receiver safety valves.
- Watts: Water heater T&P and relief valves.
- Cash Acme: Water heater relief valves.
- Apollo (Conbraco): Safety and relief valves.
- Kunkle (Emerson): Industrial safety relief valves.
What to avoid
- Non-ASME relief valves on compressor tanks or boilers
- Capping, plugging or reducing the discharge line
- Relief valves with a set pressure above vessel rating
Questions
What's the difference between a relief valve and a safety valve?
Relief valves open proportionally, mainly on liquids. Safety valves pop fully open, and are used on gas, air and steam.