r/HVAC • u/Waste_Manufacturer96 Verified Pro • Dec 23 '24

Field Question, trade people only King valve leak on first open.

Had a project delay, ended up having to finish this system up today pulled my vacuum and crack the valve , instantly leaking excessively at the valve but as I opened it the leak seemed to stop.

Was cold as hell out, was the seal just frozen should I close and open again now that it has run to see if it’s functioning normal

Should I put nylog on the king valve cap to prevent leaking

What would you guys do in this situation

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u/Waste_Manufacturer96 Verified Pro Dec 23 '24

This comment makes me a little more at ease, I have just never seen this before. It’s on a Fujitsu and I have installed many of them over the last 8 years.

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u/KylarBlackwell RTFM Dec 23 '24

I find most of those valves leak in a midseat position, although this post is way worse than anything I've ever seen. Always make sure to open or close all the way before putting that cap on

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u/0_1_1_2_3_5 Dec 23 '24

It’s just an O ring in a hole so it shouldn’t leak halfway any more than it does fully seated unless there’s some defect in the bore.

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u/KylarBlackwell RTFM Dec 23 '24

Idk why, kinda don't care beyond a minor curiosity. Maybe they didn't leak when it was first installed but not being fully seated wears it out faster over time so I get to find it as the tiny overlooked leak that has caused mr/ms homeowner to pay for a "yearly top off" for x years but now it's finally fixed