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Should an older main shutoff be exercised periodically?
An older whole-house shutoff can be hard to judge: leaving it untouched may let it seize, but operating it could expose a worn valve or leave it leaking. Is there a sensible way to decide whether periodic exercise is worthwhile, or is inspection and replacement the safer route when its condition is uncertain?
Does the answer differ for a gate valve versus a ball valve or another type? I’d also like to know what visible corrosion or seepage should make someone stop before trying it, and what precautions are sensible before testing a main shutoff.
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2 replies
I’d put the valve’s condition and the ability to deal with a leak ahead of whether it’s a gate or ball valve. If there’s visible damage or any seepage, I wouldn’t use routine exercise as a test; I’d arrange an inspection. Even a sound-looking valve is a higher-stakes experiment if there’s no practical way to respond should it fail to shut off or start leaking.
Before testing, make sure the valve is accessible, know who to call if it won’t shut off or starts leaking, and avoid doing it when a delay in getting help would be a problem. If it resists, don’t force it or add leverage; stop and arrange inspection. That preparation makes the risk easier to manage, but it doesn’t make a visibly damaged or seeping valve a good test candidate.
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