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Old 12-17-2013, 08:21 PM   #1
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valve near pump on hydronic heat boiler


Can anyone identify the purpose of this lever valve on this smallest of the three pipes going into the pump on my hydronic heat boiler?

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Old 12-17-2013, 09:54 PM   #2
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valve near pump on hydronic heat boiler


It's closed.
Could be the water feed to fill the boiler. Is it attached to main house water supply?
Can you take another picture from a bit further back.

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Old 12-18-2013, 10:59 AM   #3
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valve near pump on hydronic heat boiler


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Could be the water feed to fill the boiler. Is it attached to main house water supply?
no, there is another valve for that.

i'm thinking it may be a drain valve for the pump
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Old 12-18-2013, 11:49 AM   #4
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valve near pump on hydronic heat boiler


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no, there is another valve for that.

i'm thinking it may be a drain valve for the pump
I agree, makes sense. Maybe it's also used to get air out of the lines if you have to drain/refill boiler. Just a thought. Only thing, where does it drain to? Strange how it goes back into the boiler like that, must exit on the other side somewhere to a drain or bucket. Almost looks like some sort of bypass. Stay tuned, I'm sure someone here will identify it's purpose.

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Old 12-18-2013, 12:22 PM   #5
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valve near pump on hydronic heat boiler


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Only thing, where does it drain to?
into the main drain flow of the rest of the appliance. because this piece of the system presents a flow trap that the main drain alone won't drain.

it's kind of hard to explain but it is somewhat equivalent to the bottom of a P trap that, if you wanted drained for some reason, you'd need to have a hole in the bottom of...
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Old 12-18-2013, 05:35 PM   #6
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valve near pump on hydronic heat boiler


looks like a drain valve if replacing circulator pump
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Old 12-18-2013, 06:02 PM   #7
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valve near pump on hydronic heat boiler


Moved to 'HVAC'---Mike---
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Old 12-18-2013, 06:04 PM   #8
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A shot from further back might help---
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Old 12-18-2013, 08:28 PM   #9
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valve near pump on hydronic heat boiler


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Originally Posted by amakarevic View Post
into the main drain flow of the rest of the appliance. because this piece of the system presents a flow trap that the main drain alone won't drain.

it's kind of hard to explain but it is somewhat equivalent to the bottom of a P trap that, if you wanted drained for some reason, you'd need to have a hole in the bottom of..
.
Ayuh,.... It sounds like yer sayin' there's a check-valve in the pump, 'n points beyond won't drain through,...
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Old 12-18-2013, 08:29 PM   #10
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valve near pump on hydronic heat boiler


Looks like a boiler bypass. When adjusted properly it helps maintain proper delta temp across the boiler. Plus it allows the boiler flue passages to get above condensate temp quicker so the flues don't clog or have condensate dripping onto the burners.
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Old 12-18-2013, 09:09 PM   #11
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valve near pump on hydronic heat boiler


X2 what beenthere said.

Can you post a picture of the entire boiler? I'm just curious as that piping arrangement looks like a manufacturer's item/arrangement. Haven't seen this before.

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