These valves are used to protect process units and equipment (i.e. tanks, pipelines) from exceeding maximum allowable operating pressures and vacuum. In addition theses devices protect against atmospheric deflagration. Some of the devices are also designed to protect against endurance burning.
 
Preferred Applications:

• as pressure and vacuum valves
• as pressure relief valves
• as pressure holding/conservation valves
• as simple control valves for storage of flammable liquids