Multi-port Valve leaking

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beaverplt

Bronze Supporter
Jul 31, 2022
42
Sussex, WI
Pool Size
25000
Surface
Vinyl
Chlorine
Liquid Chlorine
Hi All,
The multiport valve in my system is leaking a small amount of water from the top. It appears as though the handle is not seating when moved. Considering that it's over 30 years old, I can't complain about it. I'm getting a considerable amount of air bubbles going through the system. Questions I have

Are the air bubbles caused by the valve? (I've gone through other possible causes and not solved it)
Can the valve be fixed?
Would I be better off replacing it? There is a Pentair valve on Amazon that looks like what I have.

I've attached a couple of pics for reference.

Thanks
 

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You certainly could look into replacing some parts in the MPV. If you Google the model number of your valve (parts breakdown), you should find a spider gasket, handle/shaft tension spring, and perhaps another part or two that contribute to both the seal and tension that is applied to the handle to keep it firmly seated. If you find the cost of replacing the parts is not much different than replacing the entire MPV, then you could go that route as well.

As bad seal at the MPV would allow air to seep "IN" when the system is off, but should not allow air to get pulled in while running. So if you are seeing air blowing out of the return jets, more than likely the air is getting pulled inwards before the pump or at the pump pot lid itself (O-ring gasket).
 
The sticker with the model number of the valve is unreadable. All I've got is a serial number. My best guess is the spring for the handle is broken or worn out. The handle is rather loose when I move it. The leak is miniscule at this point, so I may wait until fall to replace or repair it.
I was hoping the air issue was from the MPV, but alas, you've got to be right. I have a leak in the main drain that is probably sucking air from somewhere. That's another issue to work on.
 
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