Just to clarify, this is a valve between the skimmer and the pump? If that is the case you need that valve so you can open and clean out your pump basket. Are there bubbles coming out of the return? If not it sounds like your pump is cavitating due to flow restriction. Your valve might be busted or clogged, replace it, don't chuck it. However I am no expert and not familiar with intex pools, someone else might have better advice.
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