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Hello I am having an issue I would like to get some input on I appreciate it in advance! I have an air compressor that I am wanting to use to do some sandblasting and I need it to blast 40 psi so I placed a regulator on it and the tank will pressurize to 120 psi then this is where the problem happens...my regulator will also pressurize to 120 psi then as soon as I start blasting the pressure comes down to 40 psi which is where I have it set and stays there until I stop blasting then it will pressure back to 120 psi when it should stay at 40 psi on the regulator at all times.....I have tried a different regulator and is doing the exact same thing....please help!
 
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