Relief valve
Relief valve means each pressure relief device including pressure relief valves, rupture disks and other pressure relief systems used to protect process components from overpressure conditions. Relief valve does not include polymerization shortstop systems, referigerated water systems or control valves or other devices used to control flow to an incinerator or other air pollution control device.
Source
40 CFR § 61.61
Scoping language
Terms used in this subpart are defined in the Act, in subpart A of this part, or in this section as follows: