scope:

1.1 Scope

This standard is a purchase specification for flanged steel pressure relief valves. Basic requirements are given for direct spring-loaded pressure relief valves and pilot-operated pressure relief valves as follows:

a. Orifice designation and area.

b. Valve size and pressure rating, inlet and outlet.

c. Materials.

d. Pressure-temperature limits.

e. Center-to-face dimensions, inlet and outlet.

For the convenience of the purchaser, a sample specification sheet is given in Appendix A.

Nameplate nomenclature and requirements for stamping are detailed in Appendix B.