The B38 service regulator is designed for use on large commercial and industrial loads. Large orifices are available (up to 1 3/8") for high capacity/low inlet pressure applications. An added feature of the B38R is its massive relief capacity. All choke points in the relief flow path are enlarged to ensure a minimum pressure build-up in the event of regulator failure. The need for external relief valves for full capacity relief is eliminated in most applications.