www.SwimmingPoo... - A hydrostatic relief valve (HRV) is a check valve (one way valve) that is installed into the floor of a swimming pool in the main drain. The function of the HRV is to allow the ground water table surrounding the pool to equalize with the pool water. This prevents the water table from exerting an upwards force on the pool during periods of high ground water. Without a hydrostatic relief valve a pool can potentially lift right out of the ground. An HRV is required in concrete pools and fiberglass pools however most vinyl liner pools have them also even though they are not really needed due to the way a vinyl pool is built.
If you would like to see a video of an HRV and how to install one check out this video by Swimming Pool Steve: • $20 Part That Can Save...
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