Vacuum Service service
Service Selection
Butterfly Valves for Vacuum Service Service
Which butterfly valves configuration suits Vacuum Service (Sub-atmospheric pressure), in which material, to which standard — from real service data, with the pitfalls flagged.
Which butterfly valves for Vacuum Service?
Butterfly Valve (large-bore, high-performance) - Low-pressure vacuum duct isolation in ejector systems and paper machine 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
Butterfly Valve (large-bore, high-performance)
Low-pressure vacuum duct isolation in ejector systems and paper machine
Body Material for Vacuum Service
Rated from real compatibility data - click any material for the full decision page.
Governing Standards for Vacuum Service Service
ASME B16.34API 600 (refinery vacuum gate valves)ASME Section VIII (vacuum vessels)IBR (vacuum steam boilers)
What to Avoid in Vacuum Service Service
- Applies to this type: Butterfly valves with rubber liners for deep vacuum - liner collapses
- Wafer-pattern valves without bolted support in full vacuum - face gaskets may be pulled inward
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
Butterfly Valves for other services
Butterfly Valves for Sulphuric Acid (H₂SO₄)Butterfly Valves for Hydrochloric Acid (HCl)Butterfly Valves for SeawaterButterfly Valves for LNG / Cryogenic Natural GasButterfly Valves for Caustic Soda (NaOH)Butterfly Valves for Phosphoric Acid (H₃PO₄)Butterfly Valves for Nitric Acid (HNO₃)Butterfly Valves for Cooling Water
Reviewed by Process Engineering, Vajra Industrial SolutionsDiscipline: Process & Fluid Service EngineeringLast reviewed: 20 June 2026
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