Check valve installation (backflow preventer)

Check or non-return valves, sometimes called backflow preventers, are indispensable components of plumbing systems, designed to prevent the unwanted backflow of water or debris into the piping system. Correct installation is essential to ensure a well-functioning system and avoid backflow. Here is a step-by-step guide to installing a check valve:

1. Choose the appropriate location:

Determine the ideal location in the pipe to install the non-return valve. Generally speaking, you’ll want to choose an area around the lowest points of the plumbing system, or around equipment such as sinks, WCs or washing machines.

2. Check the type of check valve:

Check valves come in a variety of configurations, including spring-loaded, swing or ball-type. Select the one that best suits your situation.

3. Gather the necessary tools and equipment:

Common tools include a wrench, pipe wrench, pliers and Teflon tape. Make sure you have the appropriate non-return valve on hand, as well as any other useful equipment.

4. Interrupt the water supply:

Before installation, close the main water supply valve to prevent leaks or unexpected spills.

5. Prepare the piping:

Thoroughly clean the pipe ends where the non-return valve will be fitted. Make sure they are smooth and free of debris.

6. Install the check valve:

Secure the non-return valve to the pipe using the correct fittings. Be sure to follow the manufacturer’s instructions on valve orientation and flow direction.

7. Check for leaks:

Carefully cover connection threads with Teflon tape to ensure a perfect seal. Use the right tools to tighten fittings, avoiding any risk of leakage.

8. Check the installation:

Gradually open the main water supply and check the non-return valve for leaks. Make sure it’s working properly by observing the flow of water in the pipes.

9. Perform additional tests:

Once the installation is complete, carry out additional tests with different sanitary installations to confirm that the non-return device is working properly and that there is no risk of backflow.

10. Ensure regular maintenance:

To keep the check valve in good working order, it should be checked regularly and cleaned if necessary. If you notice any signs of deterioration or malfunction, it’s best to replace this component.

By following these guidelines and taking the appropriate precautions, you can successfully install a check valve in your plumbing system, ensuring safe, smooth operation. If you encounter any difficulties during installation, it’s advisable to enlist the help of an expert in the field to assist you.