Valve actuators mount on valves and ... Rotary motion valves (rotary valves) such as ball, plug, and butterfly valves rotate a quarter-turn or more from open to close. Linear motion valves (linear ...

Above: A pinch valve actuated by shape memory alloy (SMA) wires to open and seal a tube for industrial applications. Shape Memory Alloys (SMAs) are metals that deform when heated and return to their ...