Reduced Pressure Principle Backflow Prevention Device Assembly Test Cocks and valves

This backflow method is an assembly, since it consists of four resilient seated test cocks located on the upstream and downstream side of each check valve and two resilient seated shut-off valves. One located on the inlet and the other located on the outlet side of the check valves. Test cock #1 is located upstream of the upstream shut-off valve. Test cock #2 is located downstream of the upstream shut-off valve and upstream of first check valve. Test cock #3 is located downstream of the first check valve and upstream of the second check valve or between the first and second check valve. It is also located within the zone downstream of the relief valve diaphragm. Test cock #4 is located downstream of the second check valve and upstream of the downstream shut off valve. Test cocks #2, 3, and 4 are used in the testing of the backflow prevention device check valves, relief valve to determine if they are operating properly, and to determine if the backflow prevention device is in a static state at the time of the test. Test cock #1 is not necessarily used in the testing of the backflow prevention device but is use for maintenance purposes. For example, if repairs are need, both the upstream and downstream will need to be shutdown. If water is needed to clean the body of the backflow prevention device or other parts, test cock #1 can be used since it is located on the inlet side of the upstream shut-off valve. In addition, test cock #1 can be used to introduce water slowly into the body of the backflow prevention device during start-up or after a repair. Introducing water slowly into the body of the backflow prevention device will reduce the possibility of introducing debris into the body of the backflow prevention device, which could foul the check valves.