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 signal.
The opening or closing is usually operated by electrical, hydraulic or pneumatic actuators. Normally with a modulating valve, which 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 commonly used for their simplicity, as they only require a compressed air supply.
The pneumatic control signal are traditionally based on a pressure range of 3-15 psi or an electrical signal of 4-20 ma for industry, or 0-10v for hvac systems. With development of cheap industrial microprocessors the electrical signal offers a “smart” communication signal with hart or fieldbus foundation or profibus protocols.
|Valve Design||Bolted Bonnet, O.S. & Y.|
|Construction||Globe, Butterfly, Ball-Segmented|
|Flow Charateristics||Equalpercentage Linear Special Characterization|
|Size||½" - 28"|
|Pressure Range||150# - 2500#|
|Bore||Conventional or Reduced|
Conform To NACE MR 01-75
|Material Status||Forged or Cast|
|Shutoff Class||II, III, IV, V|