color:#1F497D">Thanks to those that replied to my original query 
regarding thevacuum on my Delta V with needle valve open and closed. 
It’s as Ithought.    Now the follow up question:
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color:#1F497D">With needle valve open and source turned on both N2 and 
Ar areoff-scale.  With compressed air firing the appropriate valves as 
normal,no immediately obvious signs of capillary breakage (both at the 
NV and withinthe ConfloIV) and no sign of significant He wastage over 
time (yes, it is onand flowing through Conflo reg), is the cause a leak 
at the needle valve or isthere something else I haven’t considered.? I 
have replacement parts for thevalve so if push comes to shove has anyone 
any advice/protocols for replacingcomponents within the valve.
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color:#1F497D">Thanks
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color:#1F497D">Neil