This is a Pneumatic Diaphragm Three-Way Control Valve with Dual Manual Functions, a multi-path flow control valve integrating pneumatic automatic control and dual manual operations. It mainly consists of a pneumatic diaphragm actuator (with main handwheel), auxiliary manual mechanism, valve positioner, and three-way valve body (marked DN80 for nominal diameter):
Automatic Mode: Receives control signals (e.g., 4-20mA) via the positioner, adjusts the actuator air pressure to drive the valve core, realizing fluid confluence, diversion or flow regulation;
Manual Mode: The main handwheel can emergency control the valve core opening, while the auxiliary manual mechanism facilitates on-site debugging and small-range flow fine-tuning.
Suitable for medium-low pressure working conditions, it is used in medium mixing and distribution processes in petrochemical, water treatment industries, combining the efficiency of automatic control with operational reliability under extreme working conditions.
