Backflow Procedure

backflow-procedureTo drain the backflow prevention assembly for protection against freezing, use the following procedures.

1. Turn off the main shut-off valve (A) which provides water to the system.

2. Open all inlet and outlet drain valves on the system (B and E). Open inlet and outlet shut-off valves on backflow prevention assembly (C and D) and all test cocks. Leave in half open/half closed (45 degree) position to allow for full drainage of ball valve shut-offs.

3. Should you “blowout” the piping system downstream of the backflow prevention assembly, make sure the outlet drain valve (E) is open and the backflow prevention outlet shut-off valve (D) is closed.

4. Connect an air line to the outlet drain valve (E) and introduce air of adequate volume to clear downstream system of water.

5. IMPORTANT: Open outlet shut-off valves to the backflow preventer assembly (C and D) to a half open/half closed (45 degree) position after “blowout” procedure is complete.

6. Leave all drain valves (B and E), test cocks and ball or gate valves to backflow preventer (C and D) in a half open/half closed position for the winter to prevent freezing. IMPORTANT: When finished, make sure main shut-off valve (A) remains closed to prevent accidental refilling of the system. Also, the main shut-off valve should be resilient seated to prevent seepage of water into the system.

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