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Unread 28-08-2015, 13:39
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GeeTwo GeeTwo is offline
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AKA: Gus Michel II
FRC #3946 (Tiger Robotics)
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Re: spud gun/T-shirt gun valve

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 View Post
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...
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.
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Last edited by GeeTwo : 28-08-2015 at 13:42. Reason: Added last paragraph