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Is it possible for a hydrostatic valve to leak pool water only when the pump is not running?

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2008-08-29 18:40:43
2008-08-29 18:40:43

YES THERE IS A LOT OF TRASH THAT CAN GET IN THE VALVE TO MAKE IT LEAK. YOU MIGHT BE ABLE TO CLEAN IT

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I found that with the pump running, the pool water was rising as apparently the pump was pulling water out of the ground. This was with the pool water low and the skimmer plugged off in order to try to filter after a bad storm. When I shut off the pump, the pool water went down as the valve did not seat properly.

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The Hydrostatic valve is usually on the lowest part of the pools floor. The hydrostatic valve is there to protect the pool from being lifted by ground water in the event that it is empty. it allows the ground water under the pool to get into the pool thereby stopping it from floating out of the ground on top of the ground water.

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A Hydrostatic valve is basically a plug that stop water coming down out of the pool, but when the water pressure under the pool gets higher then the pressure in the pool it will let water into the pool from underneath in order to stop the pool from floating in ground water.

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you will have to dig it out and put it back in the ground check for broken pipes and is at all possible install a hydrostatic valve so it wont happen again

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the hydrostatic valve is only to equalize pressure of ground water to that of the pool the only time it does anything is when the water table becomes higher in the ground water than in the swimming pool . it doesn't connect to anything. it is simply to keep the pool shell from floating out of the ground

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The question is formulated vaguely when dealing with physical systems containing water is it possible to use the description of hydrostatic. It assumes, that the system does not move, hence static. I.e. Hydrostatic pressure is the pressure that water exerts on an object.

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Yes just be careful that the hydrostatic valve works in case of ground water causing the pool to start floating.

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The valve is not be diverting all the water. This valve may need to be replaced.

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This is the hydrostatic valve. If the pool is emptied it is removed to relieve water pressure caused by the surrounding water table If not removed a pool can float out of the ground.

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If you don't have a hydrostatic valve on the bottom I would suggest at least a third. otherwise it may start floating in ground water if it is present.

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Put a gravel pit at the bottom with a means of pumping it empty. Make sure you fit a hydrostatic valve to the pool.

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procedures in testing hydrostatic pressure in fluid(water)

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The valve seat or washer on the main valve are not seating/sealing properly.

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You could leave your sink on.

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Replace flapper or check fill valve for problem.

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A hydrostatic relief valve prevents your swimming pool from wanting to become a 'boat'. If the bottom of the pool is below the level of ground-water, and the pool is emptied, the pool would want to float in the underground water. I have actually seen the deep end of a 40ft gunite pool (with no hydrostatic valve) rise out of the ground (by 18") when the pool was emptied for repairs. A hydrosatic valve would have opened (and allowed the underground water to flow into the pool) when the water pressure beneath the pool became greater than the water pressure in the pool. I am not sure if you can manually test the valve, so check with the supplier/pool builder. A hydrostatic relief valve is located in the deepest part of your pool. It may be under the maindrain cover or in its own little box on the bottom of the pool. The purpose of the hydrostatic relief valve is to relieve a build up of pressure if it occurs from underneath the pool. If the water were to be removed with a high water table then the pool may float up out of the graound like a barge. You then have a big problem on your hands. The fhydrostatic relief valve will open allowing the ground water to enter the pool to keep the equalibrium and to relieve built up pressure from underneath the pool. The valve typically does not need any maintenance. However, if the vavle has opened then there is a chance that a tiny particle could get stuck in the seal when the valve closes again. The tiniest particle (which may not even be seen) could allow water to seep out of the pool into the ground. There's a lot of water in the pool and each gallon of water weighs 8.33 pound. A typical residential pool of 20,000 gallons holds water weighing about 166,600 pounds. A commercial pool of approximately 120,000 gallons has water weighing approx. 1 million pounds. Removal of this much weight obviously changes a lot of things. You need to be very careful removing water from a pool. Things to be concerned about are high water table, underground springs, rainy weather, hills behind the pool. Please write if there are any other questions. Steve Dunn Certified Pool Instructor Consultant & equipment distributor Commercial Pool Systems, Inc. FURTHER ANSWER When you find your pool losing water and don't see any obvious place, it may be the hydrostatic valve has lifted and then not seated properly. The valve needs to be flushed by being lifted momentarily. I have done this by donning a mask and with fins and weights swum down, removed the grate, and lifted the valve by hand. If you have never seen such a valve find one in a swimming pool store and see how it works. Also, be sure there is not a lot of trash in the fixture near the valve or again it may not seat. Best to do this with the pump off if the valve is in the drain box or you may get caught by the suction. This can lead to serious death! Paul Delage

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