Safety & Relief Valves for Vacuum Service Service
Which safety & relief valves configuration suits Vacuum Service (Sub-atmospheric pressure), in which material, to which standard — from real service data, with the pitfalls flagged.
Which safety & relief valves for Vacuum Service?
Safety Vacuum Relief Valve (vacuum breaker) - Prevention of vessel collapse on loss of vacuum - admits air to break vacuum safely Typical service window: 0.001–101 kPa absolute (deep vacuum to near-atmospheric), Ambient (pharma freeze-drying) to 420°C (refinery crude vacuum unit).
Recommended Configurations
Safety Vacuum Relief Valve (vacuum breaker)
Prevention of vessel collapse on loss of vacuum - admits air to break vacuum safely
Body Material for Vacuum Service
Rated from real compatibility data - click any material for the full decision page.
Governing Standards for Vacuum Service Service
What to Avoid in Vacuum Service Service
- Wafer-pattern valves without bolted support in full vacuum - face gaskets may be pulled inward
- Butterfly valves with rubber liners for deep vacuum - liner collapses
Service Considerations
- Valve seats must seal against reverse differential (atmospheric pressure pushing in) - soft seats preferred for tight shutoff
- Graphite or expanded PTFE packing preferred - standard PTFE packing may be pulled inward in deep vacuum
- Crude vacuum unit transfer line: erosion from coke particles requires hardened trim
- Vacuum breaker (vacuum relief valve) mandatory on vacuum vessels - vessel collapse can cause catastrophic failure
Other valve types for Vacuum Service
Safety & Relief Valves for other services
Connected Engineering
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