Performance Requirements for Pressure Vacuum Breaker Assemblies
|Publication Date:||1 January 2020|
The assembly shall contain an independently acting check valve force loaded to the closed position, and an independently acting air inlet valve located downstream of the check valve that is force loaded to the open position. The assembly shall also include two tightly closing shutoffs, one at the inlet of the assembly and one at the outlet of the assembly, and two tightly closing test cocks, one immediately upstream and one immediately downstream of the check valve.
The device shall be designed to accommodate nominal pipe sizes 1/2 NPS to 2 NPS (15 DN to 50 DN).
Static Pressure Range
The maximum rated static pressure of the device shall not be less than 150.0 psi (1034.3 kPa).
a. The device shall be able to operate with cold water ranging in temperature between 33.0 °F to 110.0 °F (0.6 °C to 43.3 °C).
b. The device shall be able to operate with hot water ranging in temperature between 33.0 °F to not less than 180.0 °F (0.6 °C to 82.2 °C).