1. Action sensitivity and reliability This refers to the sensitivity of the valve to respond to changes in medium parameters. Actuator 2. Wormgear actuator A device that uses a worm gear mechanism to open, close or adjust a valve. 3. Pneumatic actuator A pneumatic actuator is a drive device that opens, closes or adjusts the valve with air pressure. 4. Hydraulic actuator The drive device that opens, closes or adjusts the valve with hydraulic pressure. 5. Connection dimensions Dimensions of valve and pipe connections. 6. Disc A general term for a part used to cut off or regulate the flow of media, such as the gate in the gate valve,…