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Rotary valve, also known as star valve, is a regulating valve that changes the valve from an open position to a closed position by rotating a rotating component such as a rotating baffle by 90 degrees. Valves are generally divided into two categories, straight stroke and rotary. Straight stroke valves allow or cut off the flow by a linearly moving component such as a gate. Straight-stroke valves include globe valves, gate valves, and diaphragm valves. Rotary valves allow or shut off the flow through a rotating part. The rotary valve whose rotary part can rotate 90 degrees is called a 1/4 rotary valve.