removing all parts of check valve from circulator

Nom_Deplume · April 2021

Hello...I am replacing a failing Grundfos 15-58 FC circulator with the same model. One of the isolation valves contains a check valve. Grundfos manual says to remove the check valve in the circulator with needlenose pliers and to make sure I get all parts out.

I took most of it out, but, there is a ring at the back of the check valve (white ring in photo) that is the same color as the rest of the check valve, but which cannot be pulled out with a needlenose. Is this supposed to come out, i.e. does it interfere with the flow? If yes, how do I take it out? I considered melting it with a propane torch but then decided to ask here instead. Just joking. Many thanks! (PS I am the homeowner.)

HVACNUT · April 2021

Just use a flat head screwdriver to pop it out.

ratio · April 2021

It's hard to get it to pop out, but it'll come. Pry with a screwdriver like suggested above, but try to not scratch the casting when it pops out.

kcopp · April 2021

Or the other option is to take a hacksaw blade and cut from the middle to the outside. That will loosen up the plastic.

hot_rod · April 2021

An O-ring pick tool, or bend the end of a small nail, like a finishing nail. Then you can lift it out easily. It is a snug fit. Or a small chisel and split that piece.

mattmia2 · April 2021

Or any piece of stiff wire and bend a hook in the end. Are we sure that is part if the check valve and not some sort of orifice?

ratio · April 2021

Yes, it's part of the check.

GW · April 2021

But some muscle into it, it will come out with a screwdriver. I recall my leatherman tool (needle nose) works a little better too, just gotta pry it out

Steve Minnich · April 2021

I always used a small, bent pick.

Nom_Deplume · April 2021

Thanks everyone! None of the tools I had (pick, screwdriver, needlenose, handsaw) got a grip on this thing. Finally I drilled a small hole in it and then cut it open by pushing the rotating drillbit sideways. It is quite hard plastic. I blew on the other end to get the plastic chips out, but can only hope I got all of them.

doninbc · March 5

I found out my grundfos hat a check valve and it was between the boiler and the expansion tank so the expansion tank was not really working.

So I needed to remove the check valve

I figured out that if I removed the casting I could access the check valve and the plastic seat from the inside with a punch.

I got the whole thing out clean and undamaged.

And the expansion tank now works like it was supposed to.

mattmia2 · March 5

it is all one system, the water will find its way to the expansion tank both because it is being pumped and keeping the flow check open and bothe sides of the flow check are open to the tank through the system.

the only way i could see that you could create a problem is if you had a zone valve, the expansion tank, then a flow check, in that order.

HVACNUT · March 5

https://forum.heatinghelp.com/discussion/comment/1890528#Comment_1890528

All you need is a big slotted screwdriver to pop out an IFC. You did a lot of extra work for nothing.

removing all parts of check valve from circulator

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