Just about every pressure pot sandblaster you purchase comes with a safety pressure release valve. This valve allows air escape the tank in case the air compressor pumps too much pressure. And too much pressure could cause the tank to explode or parts to fly off.
It is an essential safety measure. If you built your own pressure pot system from a tank, you will want to build these onto your system.
I have updated the pressure pot sandblaster plans here to include information on how to easily build these quickly into your system. (please see page 10 with list of all parts needed and page 29 showing how it is put together)
The good thing is they are also very inexpensive to build onto your pressure pot. The below item I found was one of the lower priced items.
Safety Valve, 125 psi Set Pressure, 1/4″ Male NPT
It is rated at holding up to 125 psi in the tank. If the air compressor pumps over that, the valve opens up and releases the excess pressure and closes automatically once it goes back down.
This one can be found on Amazon here.
For similar valves and difference psi ratings, please see here. They carry safety release valves with the PSI set at 50, 60, 100, 125, 150, 175, 200, 225, 250, 300 and more.
What PSI Valve do you use?
For home built pressure pot blasters, you probably want to aim for 125 or lower, but it also depends on how well you welded yours together. You can play it safe by using a lower PSI. Since I don’t usually blast much over 80 psi, a 100 psi might be suitable.
Please leave a comment below on what valve you use.
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Eric,
Thank you for the update. How can we contact you directly?
Thank you.