Can I replace this valve on the sight glass on my boiler?

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Old 10-26-08, 09:39 AM
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Can I replace this valve on the sight glass on my boiler?

The shutoff valves on the sight glass on my steam boiler have rusted pretty badly.

http://i241.photobucket.com/albums/f...e/IMG_2954.jpg

I'm wondering if I can replace just the knobs from a new valve. This is what I bought

http://i241.photobucket.com/albums/f...e/IMG_2956.jpg

Can I just use wrench to take off the knob from the new one, and replace the one on the sight glass with the new one?

Is that possible? Also, what can I do to prevent this deposit of green scale/rust or whatever it is on those valves.

Thanks
 
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Old 10-26-08, 10:34 AM
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No, you can not use a residential hose bib as a shut off for a gauge glass.
You need to get the parts you need from a boiler parts supply house.

The guage glass is a safety device and needs to have the correct replacements.

Click image:

Image courtesy of simplyplumbing.com.

There are many places to get these parts, you just need to search them out.
You would need to know the pipe size of the valves and the spacing between the fittings.
You may be able to carefully take yours apart and clean it up.
Just be careful because if you break something you may be stuck.

I know this is a diy forum but it might be a good time to get a professional service on the boiler.
Those valves are important to have because if the gauge glass breaks you would not be able to stop the flow of water.

You can prevent the deposits from forming by at least monthly exercising the valves by fully opening and closing and keeping the packing tight.
 
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Old 10-30-08, 10:50 AM
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I called a few guys off craigslist. One quoted $500 over the phone without looking, I wasn't sure about him. The other two said they can come and look, never showed up.

I will keep looking.

Originally Posted by GregH View Post
No, you can not use a residential hose bib as a shut off for a gauge glass.
You need to get the parts you need from a boiler parts supply house.

The guage glass is a safety device and needs to have the correct replacements.

Click image:

Image courtesy of simplyplumbing.com.

There are many places to get these parts, you just need to search them out.
You would need to know the pipe size of the valves and the spacing between the fittings.
You may be able to carefully take yours apart and clean it up.
Just be careful because if you break something you may be stuck.

I know this is a diy forum but it might be a good time to get a professional service on the boiler.
Those valves are important to have because if the gauge glass breaks you would not be able to stop the flow of water.

You can prevent the deposits from forming by at least monthly exercising the valves by fully opening and closing and keeping the packing tight.
 
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Old 11-20-08, 06:40 AM
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I just replaced the sight glass assembly on my boiler. You buy it as a kit ($35 at the local plumping supply store) and get the two valves and sight glass in the kit. It's called a 1/2'' Water Guage Set. The new sight glass is 12'' long and has to be cut to length depending on how far apart the two valves are on your system. This requires a special cutter so use the old glass if possible (be careful!)
Turn the burner switch off and drain water from the boiler until you can't see any in the sight glass. Unscrew the nuts at each end of the sight glass (be delicate so the glass doesn't get crushed) and slide them toward the middle of the sight glass. Remove the sight glass. I cleaned mine by gently forcing a wet piece of paper towel through it a few times. Unscrew the two valves from the boiler and replace with the new ones using teflon tape. Make sure the valve with the petcock on the bottom of it is used as the bottom valve and that the valves point exactly straight towards each other. Slide the new washers and nuts onto the sight glass and reposition the sight glass onto the new valves. Tighten the two nuts but don't force or the glass might crack. Make sure the two valves are open and the petcock is closed and you're done. n
 
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Old 01-17-10, 03:49 PM
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cracked sight glass

Crawdad,
Thanks for giving those valves names.
If I use the right names at the plumbing
supply place, they don't think I'm ignorant :-).

I was googlng because I broke the sight glass.

Personally, I fill the boiler to Normal height
before I clean the sight glass. That way,
if (when) I break it, I have a few days :-)
(The only trouble is I don't know how
strong I am :-)

I also saw a great lead on cleaning
the glass without disassembling it.
I'll try to paste the link.

Can I replace this valve on the sight glass on my boiler? [Archive] - DoItYourself.com Community Forums

If the link fails, you can google
"superior boiler sight gauge glass"
 
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