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					Originally Posted by Buckeye  Take some vasoline and spread it all over the o-ring, it helps a great deal. 
 I put a rather large amount all around the seals on mine.
 
My Dewar is a low pressure type, yours might be a high pressure type. High pressure types build up pressure very fast.
 
Some pictures would be great.
 
Is it like this one ?
http://www.bid-on-equipment.com/detail~id~51551.htm | 
	
 It looks identical to that minus the extension on the withdrawl hose. Plus mine is green. It is rather old. I was thinking about taking apart the valve and inspecting the orings tomorrow. Man I really want to use this thing this weekend at the latest.