This is a Pneumatic Diaphragm Control Valve, an automatic flow control valve powered by compressed air. It mainly consists of a pneumatic diaphragm actuator, valve positioner, filter regulator, and valve body (marked DN200 indicates nominal diameter):It receives control signals (e.g., 4-20mA) from the control system via the valve positioner, adjusts the air pressure entering the actuator, and pushes the valve stem to lift the valve core. This changes the flow area between the core and seat, enabling precise regulation of fluid parameters (flow rate, pressure, etc.). The handwheel can be used for on-site manual adjustment, suitable for emergency working conditions.
With reliable structure and easy maintenance, it is suitable for fluids such as water, steam, and chemical media. It is widely used in automatic process systems of petrochemical, power, metallurgy industries, and is a common regulating device in industrial process control.
