How to replace a faulty main water shutoff valve in your home
In short: Plumbing expert Richard Trethewey demonstrates the process of replacing a main shutoff valve that no longer stops water flow. This guide covers the essential steps for safely managing your home's water supply and installing a new valve using standard soldering techniques.
When an indoor shutoff valve fails to stop water flow, the first step is contacting the local water department to shut off the supply at the street. Once the water is off, open all faucets and showers to drain residual water from the pipes. After cleaning the main line with sandpaper, use a tubing cutter to access the pipe, keeping in mind that more water may drain out once the line is broken.
To install the new valve, clean its interior with a fitting brush and apply flux to both the pipe exterior and the valve interior. Using a torch, heat the fitting until the flux bubbles, then apply solder to the side opposite the flame. When the temperature is correct, the solder will melt and seal the gaps. Once the work is complete, contact the water utility to restore service.
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Sources
- Summary by Intellect · source: How to Replace a Main Shutoff Valve | Ask This Old House
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