Shut-Off Valve Replacement in San Jose, CA
The most expensive ten minutes in any plumbing emergency is the ten minutes spent looking for the shut-off. The second most expensive is finding it and discovering it will not turn.
Old gate valves seize. That is simply what they do after twenty or thirty years without being moved. Worse than seizing, some will turn and then refuse to seal again afterward, which means the act of testing it creates the problem. Better to find that out on a quiet Tuesday with us standing there than at eleven at night with water coming through a ceiling.
Swapping a tired main shut-off for a modern quarter-turn ball valve is one of the cheapest bits of insurance in the whole house. Ball valves either work or they do not, they move through ninety degrees rather than a dozen turns, and they do not seize the way gate valves do. The same applies to the angle stops under every sink and behind every toilet, which are the valves that let you isolate one fixture instead of shutting down the entire house.
When people call us about this
- The main house valve will not turn, or turns without stopping the water
- An angle stop under a sink or behind a toilet is seized or weeping
- You do not know where your main shut-off is
- A valve that drips from the stem once it has been operated
- Preparing for a remodel or an appliance install that needs isolation
Questions we get asked
Where is my main shut-off likely to be?+
In most San Jose houses it is on the street-facing side at or near ground level, usually within a few feet of an outside hose bib. In slab-built homes from the sixties and seventies it is often on the garage wall, sometimes low down and behind whatever has been stacked in front of it for a decade. In older homes with crawlspaces it can be just inside the crawl access. There is also a second valve out at the property line inside the meter box, which is your backstop if the house valve fails. That one usually needs a meter key, which is a cheap tool worth owning.
Should I test my valves, or will that break them?+
Test them, but do it deliberately rather than casually. There is a real risk that an old gate valve turns and then will not reseal, and that is genuinely inconvenient on the day. But the alternative is discovering the same fault during an actual emergency, when the water is already running and the stakes are far higher. Turn it gently, and if it resists, do not force it hard enough to snap the stem, because a sheared valve stem turns a modest job into a considerably bigger one. If it will not move easily, leave it and have it replaced.
What is the difference between a gate valve and a ball valve?+
A gate valve raises and lowers a wedge inside the body across many turns of the handle, and that mechanism is what corrodes and seizes when it sits unused for decades. A ball valve rotates a drilled sphere through ninety degrees: one quarter turn, open or shut, with far less to go wrong and no gradual seizing. You can also tell its state at a glance from the handle position, which matters when somebody who is not you needs to shut the water off in a hurry. When we replace a failed shut-off, a ball valve is what goes in.
Further reading: Find Your Water Shut-Off Before You Need It.
Describe it to us and we will tell you what it is.
Phone consultations do not cost anything. If it turns out to be something you can sort out yourself, we will say so.
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Shut-Off Valve Replacement across the South Bay
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