Spill-Resistant Pressure Vacuum Breaker Backflow Prevention Device Assembly – Installation Considerations

The SRPVB is not designed or approved to be installed where backpressure would be an issue, such as on a water service line to a building. The SRPVB is designed to withstand continuous pressure therefore, shut-off valves can be installed downstream of the PVB. Because of the design parameters, the SRPVB shall be installed at least 12 inches above the highest existing outlet measured from the opening of the check valve. Manufactures specification will make statement contrary to this installation requirement however, the state Manual of Cross-Connection Control Tenth Addition states that SRPVB must be installed at least twelve inched above all downstream piping and outlets. The SRPVB can be tested in-line to evaluate the operation of the check valve to close drip tight and the air inlet to open to the atmosphere. The SRPVB can also be repaired in-line as well. (In-line means not having to physically remove the device from its present position). Unlike the RPZ, the SRPVB will not visually indicate check value failures. The SRPVB is designed for continuous pressure conditions however; continuous pressure for long periods could prevent the air inlet valve from opening because it could have adhered to the air inlet valve seat due to high temperatures and water quality conditions. Continuous pressure has been defined to mean in use continuously for not more than twelve hours. Because of these issues, a certified tester should test the SRPVB at least annually. Testing of the SRPVB is required, since the only time it is know that the SRPVB is working properly is when it is tested.