Develop a vacuum seal-off valve that will support an Ultra High Vacuum envi-ronment for vacuum chambers used on Cryogenic Electron Microscopes without using the vacuum greases or lubricants typically used on sub-atmospheric vacuum sealing elastomer components on standard commercial vacuum seal-off valves. Using our standard 1” inch, SV7 Series spring loaded poppet vacuum seal-off valve, we redesigned the O-ring groove to partially encapsulate the elastomer O-ring seal, while providing a highly polished valve body groove design. THE RESULTS - A vacuum seal-off valve capable of evacuating and sealing off at the required ultra-high vacuum levels, without risk of vacuum contamination or decay from foreign lubricants and greases.

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