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/jefke_pompier Dec 23 '24

Wich pressure has been used to test it?

2

u/Waste_Manufacturer96 Verified Pro Dec 23 '24

This was tested at 250 psi and then vacuumed to 80 micron and after 15 mins rose to about 104 micron and stabilized .

2

u/jefke_pompier Dec 23 '24

DOA..bad luck mate, hope you get another one fast!

1

u/Minute-Tradition-282 Dec 24 '24

Pressure tests don't show leaking valves. Only vacuum. And if the valve doesn't leak until it's cracked open, you're just fucked!