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

Automatic Sprinkler Inspection, Testing & Maintenance

Helpful Hint

The only time a sprinkler control valve should be difficult to turn is when the valve is fully closed and there is pressure on only one side of the valve. In this case the pressure on one side pushes on the gate or butterfly tightly against the valve seat. The problem can be solved by opening the valve just enough to allow water to pass through the valve. When the pressure equalizes on both sides of the valve, it should turn easily to the fully open position. When the valve is fully open, conduct a main drain test on the sprinkler system. Most well maintained sprinkler control valves can be turned with one or two fingers.

The photos show the interior of the top and bottom of a post indicator valve.


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

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