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Leaking Service or Isolation Valve? How to Fix it.....

Updated: Feb 14, 2023

We've put together a comprehensive guide to help you tackle the issue of a leaking service valve, a common plumbing problem that can cause serious damage if left unchecked. In this guide, we'll walk you through the steps to diagnose the problem, evaluate whether you should repair or replace the valve, and provide a detailed breakdown of the repair or replacement process if you do not wish to employ a plumber.




Diagnosing the Problem The first step in addressing a leaking service valve is to identify the source of the leak. In most cases, the leak will be coming from the valve stem, which is the rod that controls the flow of water through the valve. To determine whether the stem is the culprit, you'll need to inspect the valve closely. Look for any signs of water dripping or pooling around the base of the valve, and check the stem itself for any visible damage or wear. If the stem is indeed the source of the leak, you'll need to proceed with either a repair or replacement of the valve.

Repairing a Leaking Service Valve If the valve is otherwise in good condition and the stem is the only issue, you may be able to repair the valve without replacing it entirely. To do so, you'll need to follow these steps:

  1. Shut off the water supply to the valve.

  2. Remove the handle from the valve stem.

  3. Use a wrench to remove the packing nut that holds the stem in place.

  4. Pull the stem out of the valve body and inspect it for damage or wear.

  5. Replace any damaged or worn parts as needed, such as the O-ring or washer.

  6. Reassemble the valve and turn the water supply back on.

If the repair is successful, the valve should no longer leak. However, keep in mind that a repaired valve may not be as reliable as a new one, and may be more likely to leak again in the future.

Replacing a Leaking Service Valve If the valve is old or damaged, or if the repair was unsuccessful, you may need to replace the entire valve. To do so, follow these steps:

  1. Shut off the water supply to the valve.

  2. Use a wrench to loosen and remove the nuts that connect the valve to the pipes.

  3. Remove the valve from the pipes.

  4. Install a new valve in the same position, making sure to align it properly with the pipes.

  5. Tighten the nuts that connect the new valve to the pipes.

  6. Turn the water supply back on and test the new valve for leaks.

Conclusion A leaking service valve can cause serious damage to your plumbing system and your home. By following the steps outlined in this guide, you can diagnose the problem and determine whether a repair or replacement is necessary. Whether you choose to repair or replace the valve, make sure to take the necessary precautions and follow the proper procedures to ensure a successful outcome. We hope this guide has been helpful in addressing your plumbing needs. If you have any further questions or concerns, don't hesitate to reach out to a professional plumber for assistance.


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