Pressure relief valves are designed to provide protection from over-pressure in steam, gas, air, and liquid lines. Relief valves and back pressure regulators are the same device, only differing in ...

Bolt Flange The valve has a bolt flange(s) for inlet or outlet connection. Clamp Flange The valve has a clamp flange(s) for inlet or outlet connection. Union The valve has a union connection for inlet ...

Pressure-reducing valves can easily be confused with pressure-relief valves, especially because both are sometimes called PRVs. To distinguish between the two, think of a pressure-relief valve as ...