Stop right there!
Do not use a plastic sprinkler valve (designed for water) to switch air pressure. When the valve fails, it will explode and fragment, making this a serious safety hazard.
We used a valve similar to
this for our air cannon (we used a 3/4" version). Note that it is rated for air as well as water.
For the same reasons, do not use PVC or similar plastic pipes to carry air pressure.
Quote:
Originally Posted by fovea1959
The team took on an off-season project that includes a T-shirt gun. It's all working, but the range is a little short. We're using a sprinkler valve to shoot (Rainbird, I believe), shot tank is going to about 50-70 PSI...
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Also, in general, larger valves will allow you to get more kick out of a given air pressure. A good rule of thumb to start is to have the valve (and all plumbing from the air tank to the barrel) be
at least 1/3 the diameter of the barrel.