SpudFiles

this is my new diaphragm pistol. The chamber is 1 1/2 inches and the barrel is 1/2. The diaphragm is just a circle of 3/16 neoprene. 3/8 inch ball valve for the pilot valve. i was going to use a blowgun with a hose so the gun only took one hand to operate but it didnt release the air fast enough.

oh and one question, is there any way i can reduce dead space? i cut the barrel a little too short so there is alot of room between the end of the barrel in the chamber and the pilot valve. i dont really want to glue anything on because as of now the cannon works fine (My first functioning homemade valve cannon). i was thinking of just sticking on a 1/2 inch coupling on the end of the barrel in the gun to add length and reduce the dead space. probably wouldnt hold pressure with glue though.

Im also going to add a small onboard bike pump

by the schrader on the bottom of the handle was where i was going to fill the gun from. then i decided to put it in the cap instead because of more convenient bike pump placement. plus its smart to have it behind the diagphragm

Hey where can I get those bike pump adapter nozzle things?

huh? you mean the valve that i used (schrader) to fill the gun? any auto parts store will have those, as well as bike shops

Nice. BUT, the coupler, wye, cleanot and cleanout adapter are DWV, not rated for pressure. If I were you I would rebuild it because it is a great design and look. The fittings may say sch 40 but they are DWV due to the short socket length.

really? dangit so THATS how you tell. I think i will just take my chances though because i dont think im going to be taking past like 60 psi. thanks for the concern though. this is just one of those guns that i made for portability, not power.

Look at the damn bushing, it is 1/3 in the socket. Also look at the fitting it will say NSF DWV. It shoud be in a different section at the store too.

id like too point out that uve made like all of ur guns out of dwv and ur still here so there really isnt any need for concern

Just pop a few screw into each fitting and your fine. And about the 1/2" coupler on the barrel, you could glue it on fine. Try it.