How does the multiport valve attach on a Triton sand filter?

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  • Last Post 26 August 2019
NickJoh posted this 25 August 2019

I noticed a leak where the bottom L shaped pipe that connects the multiport valve to the sand filter joins the valve body and wondered if when installed it is supposed to be glued (PVC cemet)? I see no evidence of PVC cementm and it's been installed almost 20 years but I also don't see any cracks or anything to explani the water coming out of that joint. I guess the design may have changed over these years. Perhaps reading the installation instructions on a new valve might answer this. An exploded diagram would help too. It souds crazy but I have seen PVC joints that were forgotten (never glued) last in drain systems but I would think the pressure at  the sand filter would expose that sooner.

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InyoRob posted this 26 August 2019

In most cases, the valve is not glued to the body of the sand filter. It is connected by two union fittings.

Click here to see a part breakdown of the 1.5" multiport valve.

Click here to see a part breakdown of the 2" multiport valve

NickJoh posted this 26 August 2019

In most cases, the valve is not glued to the body of the sand filter. It is connected by two union fittings.

Click here to see a part breakdown of the 1.5" multiport valve.

Click here to see a part breakdown of the 2" multiport valve

 

Sorry, I didn't communicate my question well. My leak is not at the union where the "L" shaped bottom pipe connects to the sand filter but at the top of that bottom pipe where it joins the multi-port valve body.

InyoRob posted this 26 August 2019

It's likely that you have the style where the pipe was glued into the body of the valve at the factory.

Praher Multiport Valve 1-1/2" Threaded, Generic - SM1-PP3

They also made a version that has threaded ports at the bottom of the valve. This type of valve was designed to be used on multiple filters because of the flexibility of the plumbing configurations.

Praher Universal Multiport Valve 1-1/2" FPT (Sand/D.E.) - SM-10-A0 - SM-10-AO

NickJoh posted this 26 August 2019

Since the leak is not very bad is it likely that installing the gasket kit would at least stop it during normal operation (filtering) and only leak while backflushing? The bottom tube is only used when backflishing, right?

InyoRob posted this 26 August 2019

The backwash line is usually on the side of the valve and there is a sight glass right before it. Gaskets probably won't fix the issue if it's leaking from the port on the bottom. 

The video below explains how the valve operates.

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