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Backflow Preventer Repair Help

repair helpRepairing a backflow preventer can be complex and should only be done by a certified backflow technician. When performing a repair, the goal is to return the assembly to the original manufacturer specifications. The first step will always be to conduct a field test on the backflow preventer to determine what level of repair is required. The next step is to troubleshoot the assembly to pinpoint the problem. Most major brands of backflow preventers are designed and built to provide decades of service and to be repaired without removing them from the pipeline. The number one cause of failure in backflow preventers is due to the dirt and debris that flows through the pipeline. The check valve will foul when the debris gets caught between the disc and seat. Regional conditions, such as the salt air of Florida or the freezing temperatures of Minnesota can shorten the life of any backflow preventer, often by causing internal parts to malfunction prematurely.

There are eight different types of repairable backflow assemblies and devices. They are the Double Check Valve Assembly (DCA), Reduced Pressure Principle Assembly (RPA), Pressure Vacuum Breaker (PVB), Spill Proof Vacuum Breaker (SVB), RP Detector Assembly (RPDA), DC Detector Assembly (DCDA), Atmospheric Vacuum Breaker (AVB) and Dual Check.  Each backflow assembly will have internal components that will experience normal wear and will require service from time to time. The check valve is a major component within any backflow assembly. The check valve will consist of a poppet, spring, guide, seat and seating surface (rubber disc).Repair Photo The rubber sealing surface and guide mechanisms get the most wear and typically will require regular cleaning or replacement. If the seat of the check valve is damaged in any way, it will need to be replaced. Check valve springs normally only need to be replaced if they are broken or damaged. A reduced pressure principle assembly (RPA) has a hydraulically balanced relief valve. This relief valve will require normal maintenance and cleaning of the sensing line to ensure it is working properly. The relief valve also contains the diaphragm and a seat disc that can become worn over time and need replacement. The PVB and AVB both have an internal float assembly that can become damaged if exposed to freezing weather. These are just some of the more common repairs that technicians can face in the field.

The backflow technician repairing the assembly must be able to identify the manufacturer and model of the backflow assembly to determine which parts and repair procedures are required. Our Assembly Repair Matrix makes it easy to find the repair procedures or videos. Simply select your manufacturer and model to pull up the repair procedures tab. These fantastic tools are invaluable and help ensure a proper repair.

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We have certified technicians that are available for questions, so contact us today with your backflow repair questions and get the answers you need at (800) 575-9618.