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Thread: Can you use a check valve at the inlet?

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    Can you use a check valve at the inlet?

    I see some people that use a union, and a ball valve at the skimmer and the inlet, to make it easier to winterize. Instead of a ball valve, could I use a check valve at the inlet? This would help prevent the water from coming back if there was a leak somewhere in the lines, yes? Or is this a bad idea?
    14.6K gal., 24ft, 54" above ground. 2HP, 2speed Hayward pump (4psi low, 18psi hi), 150sqft cartridge filter. 4x20 solar panel (6 psi).

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    JasonLion's Avatar
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    Re: Can you use a check valve at the inlet?

    You can use a check valve on the return line, or a valve. On the suction line you need to use a valve. Check valves tend to reduce the flow rate a little, so they make your system slightly less efficient, not a big deal but enough to cause most people to go with a valve.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Can you use a check valve at the inlet?

    Quote Originally Posted by JasonLion
    You can use a check valve on the return line, or a valve. On the suction line you need to use a valve. Check valves tend to reduce the flow rate a little, so they make your system slightly less efficient, not a big deal but enough to cause most people to go with a valve.
    Do you think, for an above ground pool, with an oversized pump, lol, and two solar panels, would the check valve reduce efficiency to be noticed? Am I right in the first place, to think a check valve on the return line, right by the pool, would be a small safety precaution if any of my hoses, motor, filter, were to leak?
    14.6K gal., 24ft, 54" above ground. 2HP, 2speed Hayward pump (4psi low, 18psi hi), 150sqft cartridge filter. 4x20 solar panel (6 psi).

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    JasonLion's Avatar
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    Re: Can you use a check valve at the inlet?

    Adding a check valve won't hurt anything, it's really only a disadvantage if you are very focused on performance.

    A check valve will limit how far down the pool can drain if there is a leak near the pump.filter. Water will only be able to drain through the skimmer, and when the skimmer goes dry you will stop losing water. That isn't really a common problem, but if it does come up a check valve will help.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: Can you use a check valve at the inlet?

    Thanks Jason. I just want to do a decent job plumbing what I "think" will be permanent. (Besides taking it all down for winter, lol) I am plumbing in a solar panel, but plan to get a second one, and will either build racks or do the roof, so obviously much of my plumbing will be temporary for now.

    Would this be overkill? LOL

    http://www.plumbingsupply.com/images/ch ... rkings.jpg

    It's an internal pic of a Checkmate PVC Combination Ball and Check Valve.
    14.6K gal., 24ft, 54" above ground. 2HP, 2speed Hayward pump (4psi low, 18psi hi), 150sqft cartridge filter. 4x20 solar panel (6 psi).

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