Mich. Admin. Code R. 408.4283 - Relief valve size

Rule 283. No relief valve shall be smaller than 3/4 inch nor larger than 4 1/2 inches standard pipe size. The inlet opening shall have an inside diameter approximately equal to, or greater than, the seat diameter. In no case shall the minimum opening through any part of the valve be less than 1/4 inch diameter or its equivalent area.

Notes

Mich. Admin. Code R. 408.4283
1979 AC

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