On/Off & Shut Off Valves – Shutoff – SV & VO Series

Vacuum Seal Off Valves

The most diverse product offering of high vacuum and ultra-high vacuum relieving and non-relieving seal-off valves available from CIRCOR Energy. Our low profile, compact design and reliable vacuum tight sealing capabilities make these valves the choice for all your vacuum sealing applications.

Whether it be vacuum insulated piping, vacuum chambers, Dewar's and pressure vessels, or over the road cryogenic transporters these valves will assure long lasting vacuum tight integrity and safety. All our vacuum seal-off valves and tool operators are tested to meet 1 x 10-9 scc GHe/sec mass spectrometer seat leakage.


  • Available in a variety of configurations from 1/4" to 3" sizes
  • Available in stainless steel and aluminum

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