Note that the QEV piston is a cup seal and if you fill from the chamber side it will never seal - you will need to poke a small (small!) pin hole in the edge. do you mean the initial fill from zero psi ? havent got that far yet. was thinking about drilling a air fitting for a rubber ball and pin, b...

this will be my first completed homemade air rifle. i think i will use a air chuck for a pilot valve for now. i am going to try to set it up as a hammer valve/qev. the air chuck doesnt look much different from a crosman valve so i dont see why it wouldnt work atleast reasonably well. http://i1297.ph...

thank you for sharing your build. i have been planning to build this since i first saw your videos. i been meaning to get down to grainger and buy one of those alpha qev, until i saw on ebay http://www.ebay.com/itm/ALPHA-82650-08-QUICK-RELIEF-EXHAUST-VALVE-FNPT-SIZE-1-2-82650-NEW-B995-/111209394273?...

thank you beastmode986 for this thread. very good reading here. i have a question though. do people realy put 1000 psi to the cheaper aluminum qev? http://www.ebay.com/itm/Pneumatic-Quick-Exhaust-Valve-3-8-NPT-Ports-Aluminum-/250495350816?pt=Pneumatic_Hydraulic_Valves_Parts&hash=item3a52afb820#ht_13...

i should have said i am trying to build a qev. i got the piston to seal. now i am going to glue some things togother, and try to get it operating the way it should. what i would like to know is would reducing the pipe size between the tee and the blower make any difference for the better, or should ...

very interesting thank you. i did a search on 26 U.S.C. § 5845(F) and alot of atf.gov/files came up. i read part of one and basically it said the decision comes down to one person or one of his minions. so if you live in the U.S. be very careful what you type on your computer or say on your phone. y...

oh yes the pilot valve is what i meant. thank you for correcting me. i was wondering if there would be any difference between 1/2 and 3/8 inch?considering the piston is 3/8 and i am using a ordinary blow gun. will it matter the size if pipe between the piston and valve?

hello, i am new to spud files. i would like to thank everyone for posting their projects and the owner of spud files for this site. i am building 1/2 inch air rifle. the piston is 3/8 inch. would it make any difference in air flow whether the check vale is 3/8 or 1/2 inch?

thank you.

thank you very much. this looks great. up till now the best i found was http://www.formufit.com/trimble-sketchup-downloads/