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NOTE: This is an unformatted excerpt from our online fire protection training library.

Automatic Sprinkler Inspection, Testing & Maintenance

fully closed and then fully reopened

This annual operating test assures that the valve can be closed in an emergency. In addition to assuring the valve can be closed, the test can clear scale from the seat of the valve so it closes tightly. Failure to conduct this test can result in a buildup of minerals and scale that can prevent the valve from closing fully.

Conduct the test by first turning the valve in the open position to assure the valve is fully open. Then turn the operating handle to close the valve and count the number of turns required to fully close the valve. Then reopen the valve, counting the turns, making sure it opens the same number of turns it was closed. Do not "jam" the valve open. This can result in damage to bronze thrust collars, brass seats, and threads. When the valve is fully open, back it off about one quarter turn. Complete the test by conducting a main drain test on the sprinkler system.
NOTE: This is an unformatted excerpt from our online fire protection training library.

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