Is it accepted in international plumbing code to install a check valve in drainage system (especially in main sewer lines)?

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Originally Posted by AbouAdel

Is it accepted in international plumbing code to install a check valve in drainage system (especially in main sewer lines)?

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A sewer check valve's (see image) is acceptable In my code, (SPC) . However the drawback to that is while the check valve's blocking a street back up you can't drain or flush anything in the house. Let's see what some of our other experts say about it, Cheers, Tom

What problem are you faced with that brings up this question? Just wondering!