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RPZ Valve Install - An Expert How-To Guide

Updated: Feb 9, 2023


In this article, we'll be covering the fundamental factors on how to install an RPZ valve. As one of our core areas of expertise in backflow prevention, Titan are leading specialists in reduced pressure zone valves. Whether its a relocation, repair or testing, we're equipped with a team of approved Engineers who bring forward over 50 years of water management experience. Our guidance regarding the installation of RPZ backflow devices is aligned with standards set in the Water Suppliers' Approved Installation Method issue 2.




Installing an Reduced Pressure Zone (RPZ) valve is a crucial step in ensuring the safety of your water system. The following are the steps for installing an RPZ valve:

  1. Turn off the water supply: Before starting the installation, turn off the main water supply to the building. This will prevent water from flowing into the plumbing system during the installation process.

  2. Locate the incoming water line: Locate the incoming water line that supplies water to your building, and mark the spot where the RPZ valve will be installed.

  3. Install the RPZ valve: Mount the RPZ valve near the incoming water line, making sure it is level and securely attached to the wall. Connect the incoming water line to the inlet side of the valve, and connect the outlet side of the valve to the building's main water supply line.

  4. Install the test cocks: Install the test cocks on the RPZ valve, which are used to check the valve's performance.

  5. Install the bypass line: Install a bypass line, which allows for the RPZ valve to be serviced without shutting off the building's water supply. The bypass line should be connected to the RPZ valve and a shutoff valve should be installed near the RPZ valve.

  6. Test the RPZ valve: After the installation is complete, test the RPZ valve to make sure it is functioning properly. This can be done by opening the test cocks and checking for water flow, or by using a pressure gauge to check the pressure in the system.

  7. Turn on the water supply: Once the RPZ valve has been tested and found to be functioning properly, turn on the main water supply to the building.

It is important to note that the installation of an RPZ valve should only be done by a WIAPS Approved Engineer, like a member of our team, as improper installation can lead to leaks and other issues.


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