A control valve is a valve with a power positioning actuator for moving the valve plug to any position relative to valve port or ports in response, and in proportion to, an external input received.
The opening or closing is commonly operated by electrical, hydraulic or pneumatic actuators. Usually a modulating valve can be set to any position between fully open and fully closed; positioners are used to ensure the valve attains the desired degree of opening. Air-actuated valves are used for their simplicity as they only require a compressed air supply.
The pneumatic control signal is traditionally set on a pressure range of 3-15 psi or an electrical signal of 4-20 Ma for industry, or 0-10 V for HVAC systems. With development of cheap industrial microprocessors the electrical signal offers a “SMART” communication signal with Hart or Fieldbus protocols or Profibus protocols.
Bolted Bonnet, O.S. & Y.
Globe, Butterfly, Ball-Segmented
Equalpercentage, Linear, Special, Characterization
½" - 28"
150# - 2500#
Conventional or Reduced
Cast Iron, Carbon, Steel, Stainless, Steel, Duplex, Alloy
Forged or Cast
II, III, IV, V
All materials are in conformity with NACE MR 01-75
Stabilimenti di produzione di valvole a sfera
Via per Gallarate, 50
21010 Besnate (VA)
Stabilimento di produzione di Gate, Globe
and Check Valves
Via A. Mauri
20900 Monza (MB)
CONTROLFLUID - KOREA