A quarter-turn rotational motion valve, the butterfly valves are used to stop, start and regulate flow. Easy and fast to open, the valve usually comes equipped with a gearbox where the hand wheel by gear is connected to the stem. This simplifies the operation of the valve, but at the expense of speed. Being lightweight, and quick to use, the butterfly valves are available in large sizes and can cope with low-pressure drop and high-pressure recovery.
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