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It depends on the vessel or machine the safety valves are supposed to protect. If the machine is designed to produce air up to 150 psi, then the safety on the machine should be set for 150 psi. If with that same machine, there is an air tank designed to hold a maximum allowable working pressure ( A.S.M.E. Code Section VIII - unfired pressure vessels) of 125 psi, then the safety valves should be set at 125 psi.

*The minimum design pressure of all pressure vessels is at least 30 psi, even when they are intended for use at less than 30 psi. Some vessels and machines are designed for pressures exceeding tens of thousands of psi.

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