Inspection of Pressure elieving Devices - API Ballots

The device may also be designed to prevent excessive internal vacuum. The device may be a pressure-relief valve, a non-reclosing pressure-relief device, or a vacuum relief valve. Common examples include direct spring loaded pressure-relief valves, pilot operated pressure-relief valves, rupture disks, buckling pin devices and weight-loaded devices.

  Pressure, Vacuum, Spring, Relief, Loaded, Vacuum relief, Spring loaded pressure