Pressure Vacuum Breakers (PVB)


Metro Testing installs, tests, and repairs Pressure Vacuum Breakers all across the Twin Cities area and all of Minnesota.

Call us at 612-221-5888 to get help with your Pressure Vacuum Breaker backflow preventers.

Among the different backflow prevention devices, the pressure vacuum breaker or PVB is considered the most affordable and most widely used kind of whole system backflow preventer. It is comprised of several parts such as an inlet shutoff valve located at the bottom, a single valve body, an outlet shutoff valve, a check valve and a couple of test cocks. The simplicity of design makes the pressure vacuum breaker quite easy to install, repair and perform maintenance on. In areas where there is frost, some pressure vacuum breaker products offer built-in freeze protection but this does not extend to the outlet and inlet pipes.

PVB Leaking

Sometimes PVBs have a tendency to eject water or leak and may create an inconvenience for indoor installations. To avoid this a gap drain needs to be installed on the system. One can also avail of spill-resistant models to avoid the problem. Leaking under the bell or bonnet assembly of the valve is also a common issue with this device

PVB Installation – Twin Cities

Pressure vacuum breakers need to be installed at least twelve inches above the highest downstream point on the system. They also need to be installed vertically and with the inlet located at the bottom. The PVB device can prevent back-siphonage but is powerless against back pressure issued. No chemigation is allowed with this device and it cannot be installed in areas where there is a consistent threat of back-pressure.

PVB Testing – Minneapolis and St Paul

The fact that a pressure vacuum breaker is an integral part of any irrigation system it is therefore vital that it be tested to ensure that it is working properly. To test a pressure vacuum breaker a certified tester needs to perform several procedures under controlled conditions.

Annual PVB Testing

Backflow prevention devices show almost no physical signs of wear and tear or malfunction until it is too late. It is required that a test be done annually to determine the integrity and performance of the device.

PVB Overhaul

As a rule, backflow prevention devices often last decades as long as regular maintenance and testing is performed. However, wear and tear can take its toll on the internal components and exposure to freezing temperatures as well as by normal use pressure can damage it overtime. A sure sign that there is an issue with your device is if there is leaking under the bell or bonnet assembly of the valve. With the use of a repair kit the repair commences with the turning off of the inlet and outlet ball valves and then removing the bonnet assembly. Once the repair parts are installed and the device is placed back to its original position the water supply is turned on to test it.