References for manual valves

MTVLManual valves are required to shut down pipelines in connection with repairs of pumps or other repair work. Because it is hand-operated, it is a valve that you rarely need to use. For more frequent use, the manual operation is replaced with an actuator and is then called a shut-off valve. Selection of valve type depends of process data and, like the shut-off valve, it gives a certain pipe resistance. The ball valve has the lowest pipe resistance while the butterfly valve has a slightly higher resistance

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