ORIGINAL: MaJ. Woody
Lots of things can be at play here and it is rarely the valve. I can tell you that I think Ultra Precision is an outstanding company. I own 9 of these valves. I have had a few minor problems with valves and they always get me on the right track fast. If the valve ever needs repair it is done for FREE for LIFE. I damaged one of the valves during the F-5E crash so I called them to order the replacement parts and asked if they were ready to take my credit card info. Their reply was "Oh no there is no charge"!! I said but The jet crashed this is not your fault and they replied that they guarantee their product for life even if you broke it!! I just can’t say enough about the product or the unequalled customer service and product support. Give them a call and they will walk you through a diagnosis. I am a customer for life!!
Same experience here - he (Phil ?) offered to repair a crash damaged valve free of charge, or to send me the nipples etc for me to repair it myself.
There's customer service, and then there's 'above & beyond'. No question which of the two U.P. fits in.
I agree with the previous posts - suspect the valve last, and the gear first.
Gordon