EEVblog Electronics Community Forum
General => General Technical Chat => Topic started by: Photon939 on May 08, 2017, 05:39:53 pm
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I bought an MVE Cryoshipper dewar on ebay a while back without realizing it had a fiberglass neck. It currently has little insulation value as it seems to have lost its vacuum. I do not know the name of the vacuum port on the side for re-pumping and haven't found any useful information online besides a crappy diagram, let alone a place where I can buy an adapter for a reasonable price.
Any info would be helpful. Also I don't have any high vacuum stuff, just a cheapo harbor freight single stage HVAC vacuum pump that claims it can pump down to 75 microns best case scenario. Hopefully that would be a good enough vacuum to hold LN2 again.
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I like how you couldn't be bothered to move the handle out of the way so we could actually see the fitting.
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I will take a better photo asap, do not currently have access to it. That was the only picture I had in my dropbox that showed the fitting at all.
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The tool your looking for is a "valve actuator or vacuum valve actuator" and the Googling is left as an exercise for the student.
Cpc-cryolab comes to mind as an example.
S.
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Here is a better photo for those that may come across this thread in the future
Thanks for the suggestion Steve - using that term I have found two of the valves but there is no way I am paying $400+ for this valve. Unless I can find a substantially cheaper option it seems this dewar will be useless.
Perhaps I could drill a hole in the side and braze in a standard HVAC access port.