The pneumatic diaphragm single-seat control valve consists of a pneumatic multi-spring diaphragm actuator and a low-flow-resistance single-seat valve, offering stable operation, reliable performance, minimal seat leakage, precise flow characteristics, and a wide adjustable range. With pressure ratings from 1.6 MPa to 11.0 MPa and a small rated flow coefficient KV, it is suitable for numerous applications requiring precise control of low flows, such as fine chemicals, food additives, pharmaceuticals, and electronics industries.
Pneumatic control valves are characterized by simple operation, fast response, and inherent safety, requiring no additional explosion-proof measures. They are suitable for applications with strict leakage requirements, low pressure differentials across the valve, and media with certain viscosity or containing small amounts of fibers.
Working Principle of Pneumatic Diaphragm Single-Seat Control Valve:
The pneumatic diaphragm single-seat control valve uses compressed air as the power source and drives the valve body movement through related accessories such as an electric valve positioner, converter, solenoid valve, and hold-up valve. By adjusting the flow area between the valve plug and seat, it regulates flow rate, enabling either on/off or proportional control. It receives control signals from industrial automation systems to regulate various process parameters such as flow rate, pressure, and temperature in pipelines.
Pneumatic diaphragm single-seat control valves are divided into air-to-open and air-to-close types. An air-to-open valve gradually opens as the signal pressure increases, and remains closed when there is no signal. An air-to-close valve gradually closes as the signal pressure increases, and remains fully open when there is no signal.
