Power-operated used to regulate or manipulate the flow of fluids, such as gas, oil, water, and steam. It is a critical part of a control loop and is an example of a final control element.

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They are used in a wide variety of process media and industries especially in water supply, collection, and distribution, as well as pumping stations, and have a broad range of use cases especially in flow isolation.

Manually or pneumatically controlled valve that can be used to control the flow of fluids through pipes It consists of two-piston valves that are actuated by a pneumatic system. The piston actuator provides a linear motion to lift the seal off its seat. The seat is positioned under an angle to minimize flow impedance in the open position.