Locate this valve’s drain cap and open the valve to drain the last of the water left between the irrigation system and the backflow device. If you plan to hire professionals to perform a blow ...

If there are valves on the backflow preventer itself, turn the two blue levers a quarter turn and the two screws a quarter turn. You don't want them to be all the way shut or open.

The valve box typically contains the main shut off valve, which controls the flow of water for the entire sprinkler system, as well as the manifold, and a series of sprinkler control valves, which ...

10. Now, release any remaining pressure in your sprinkler system using the valves on the backflow device, or via the manual drain valve. Be sure to close the valves again afterwards.

You’re going to want to make sure the above-ground components of your sprinkler system—-like the main valve, exposed pipes and backflow preventers—-are adequately protected from harsh winter ...

If there are valves on the backflow preventer itself, turn the two blue levers a quarter turn and the two screws a quarter turn. You don't want them to be all the way shut or open.

7. After you are done blowing out the sprinkler system, turn all the ball valves and petcocks to a 45-degree position so they are half open and half closed.

Backflow preventer installation costs also vary by the size of the valve. Measurements refer to the diameter of the valve; these typically range from 0.5 inches to 12 inches.

The issue of sprinkler-system backflow prevention is a complicated one, but for most Longview residents, it boils down to one thing: A costly headache of home ownership. A public hearing earlier ...