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Update: That old trick with the heat gun on a seized bleed valve actually saved my butt yesterday.
Had a 737's valve stuck solid for an hour, but a quick, careful heat cycle with my Milwaukee gun got it moving without a single thread damaged. Anyone got a better method for these stubborn ones?
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finleym375mo ago
Heat is a classic for a reason, but the real trick is knowing when to back off and let the penetrant do its job. I've seen guys cook a valve until the packing smokes, which just makes a new problem. A little heat, then a few solid taps with a brass hammer on the body (not the stem) often breaks the corrosion seal. Letting it cool completely before trying to turn it again seems to help the threads let go.
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jana5095mo ago
Pat's got a point about the water, but quenching can be risky on cast iron. Letting it cool on its own is safer, the thermal shock can crack the body.
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hayes.wade5mo ago
Honestly, a guy at our shop swears by heating just the valve body with a small torch for 30 seconds, then immediately quenching it with a spray bottle of water. The quick shrink can crack the corrosion without cooking the packing.
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pat_harris5mo ago
Tried that once on a seized gate valve. Worked like a charm, but you gotta be real quick with the water. Almost turned it into a permanent decoration.
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