Gas Valve Vent

[MandM18]

I'm new to the service and am still learning alot about all the little details of furnaces. I was wondering if anyone can explain to me what the vent on the gas valve does and why my gas leak detector picks up on it. Thanks!

[VTP99]

To equalize the pressure on the diaphragm inside the regulator in respect to atmosphere.
This is for a gas regulator.

[tedkidd]

You are detecting a gas leak?

[MandM18]

Yea, there's that little pinhole in the barbed brass fitting, if it's a sealed combustion furnace, and if its open combustion the pinhole is under a metal cap. If I put my detector anywhere near the barbed fitting or the cap it goes off.

[firecontrol]

First of all the electronic combustible gas detectors will trigger on a few things other than just the gas coming into the house for the furnace to use. Experimentation, reading the instructions that came with your particular tool and searching the different pro-forums will educate you.

The vent on a gas valve is there to allow the pressure regulator inside the valve body to reference atmospheric pressure. There should be no gas leaking from the gas valve itself from this vent or anyplace else.

[beenthere]

You need to get your post count up to 15 and apply for pro membership.

Lots of good info in the pro tech forums.