Schrader pressure limit?

[boyntonstu]

Stu, I have tried a couple of those "clip on" style chucks. They blow off at ~250psi. I use only probe style fills and threaded connections with check valves now. Trouble free.

http://www.pyramydair.com/site/articles ... d-port.jpg

Another option is these fittings used on many pcps. They have the check valve built in. For lower pressures, I'm sure you can figure how to make one from a common compressor fitting?

http://www.crosman.com/blogs/croswords/ ... shots2.jpg



The fitting I linked you to previously, does not open the valve, rather the incoming pressure must overcome the spring on the schrader. This means that when you stop pumping and go to remove the fitting, the schrader is already closed and won't leak.

The downside, is that you need to generate the extra 70psi to crack the schrader open.

Of course! Hand hitting head.

All one needs to do is to thread on a fitting onto the Schrader that seals to it. Perhaps an O ring.


I reworked my gun today with the ball valve reversed.

A Schrader pilot cannon would be very efficient and could be configured to a smooth acting trigger.

OTOH Keeping the Ball valve as a safety may be worthwhile.

I found that I had to bump the piston closed with the ball valve.

Your information gives me food for thought and I might give it a try.

Thanks for your help.

BoyntonStu

[boyntonstu]

The downside, is that you need to generate the extra 70psi to crack the schrader open.

... unless you "doctor" the stem spring

When the "doctor" left, how low was the temperature of the "patient" (psi)?

Did you remove a portion of the spring to weaken it?

[jackssmirkingrevenge]

Which type do you have?