Single-Seat Control Valve

The Single-Seat Control Valve uses a single-plug, single-seat design with only one sealing surface, giving low leakage and a high shutoff class. Combined with a pneumatic diaphragm actuator and a valve positioner, it continuously adjusts the valve opening in response to the control signal to achieve automatic control of flow, pressure, temperature or level. The plug is piston-shaped and offers equal-percentage or linear flow characteristics; the leakage class can reach FCI 70-2 Class IV/V. It is suitable for small and medium bore lines where regulation accuracy and tight shutoff are required and differential pressure is moderate.

· Single plug and single seat, low leakage and high shutoff class (FCI 70-2 Class IV/V) · Equal-percentage / linear flow characteristics available · Pneumatic diaphragm actuator + positioner for high control accuracy · Wide rangeability and good regulating performance · Replaceable plug to suit different flow coefficients · Pneumatic / electric actuator options

For automatic flow, pressure, temperature and level control in small and medium bore lines of chemical, refining, power plant and district heating systems, especially where low leakage is required.