316SS Pressure Relief Valve (PRV). Maximum working temperature 480F/250C, maximum pressure 750PSI. 1/4" Male x 1/4" Female connnections. Adjustable from 250~500PSI, factory set at 500PSI opening pressure. Our relief valve is designed for a variety of applications, for example to ensure safety and protection of downstream process equipment by venting excess pressure from a regulator should a minor seat leak occur.