Removing plastic drain valve. Also Do I need a check valve?


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Old 08-12-17, 07:02 AM
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Removing plastic drain valve. Also Do I need a check valve?

Hey guys.

I have two brand new WH that I need to connect. My house has passive hot water return circuits that were plumbed into the drain valves of the previous WH.

The problem is the new WH come with plastic drain valves that do not want to unscrew with a wrench.

Here is a pic:


The plastic is kind of soft and it just seems to deform when you push on the wrench. I'm kind of nervous about just cranking on it, they're brand new heaters and they weren't that cheap.

Here is how the old WH were connected:





A second question is on the return, this section:



has to go, for some reason these pieces were joined with silver solder. At first I thought that thing after the cut off valve was check valve but the people at the plumbing store have told me that no, it's a filter. The question I have is should I install a check valve? Or is it not necessary. The plumbing in this house was rather elaborately installed and they didn't skimp on valves so maybe its not necessary?????? Although to my uneducated mind, it would seem like you wouldn't want it to back flow but maybe that's not an issue?
 
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Old 08-13-17, 08:18 AM
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Ok with hacksaws and blowtorches the plugs came out.

Still wondering about the check valve
 
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Old 08-13-17, 09:44 AM
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That doesn't look like a filter to me.

Name:  cv.JPG
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Old 08-13-17, 04:48 PM
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I assumed it was a check valve. The people at the plumbing store seemed convinced it was a filter.

Something like this I assume (from internet:

https://http2.mlstatic.com/filtro-y-...4_022017-F.jpg

https://http2.mlstatic.com/filtro-y-...9_022017-F.jpg

Let me take some more pics of the actually piece.
 
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Old 08-14-17, 12:26 PM
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That is most definitely a check valve (swing check) and it is most definitely necessary. Check out this page. https://www.google.com/imgres?imgurl...act=mrc&uact=8

Without the check valve you would have the cold water flow backwards into the recirculating piping and never get hot water from the faucet.
 
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Old 09-08-17, 10:00 PM
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It is a check valve, and I bet it doesn't work anymore.
 
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Old 09-11-17, 07:46 AM
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It was a check valve and it was half filled with scale. Maybe why the tanks died? Although it was their time.

Thanks for the help. Any reason they're making these drains imposible to remove now?
 
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Old 09-11-17, 01:12 PM
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The plastic drain valves are not impossible to remove, just difficult. You need to turn them with a pipe wrench while also applying an outward force. Eventually it will come out.

As for why...the reason why everything else is made cheaply these days, MONEY. Three cents for a plastic drain puts more money in the manufacturer's pocket (as well as the company shareholders) than would using a three dollar metal valve.
 
 

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