These devices are direct acting weight or spring loaded in-line valves, pallet type, used to protect plant equipment (tanks, vessels, process technical apparatus, piping etc.) against unallowable operational high pressure or vacuum. In-line valves may also be installed as end-of-line valves. In end-of-line applications the open area to atmosphere has to be protected against weather impact, dirt particles or animals.
 
Preferred Applications:

• as pressure containment valve i.e. for blanketing systems
• as pressure reducing valve i.e. to connect to nitrogen blanketing systems
• for controlled venting of plant or storage tanks into a vapour header system
• as back flow protection device in exhaust or inerting systems