Control Valves
Control valves regulate process variables such as flow, pressure, temperature or level by throttling flow according to a control signal. Vanera offers a complete control valve solution, from globe control valves to segmented ball and piston valves, plus proportional pneumatic and electric actuators.
How Does a Control Valve Work?
A control valve converts the 4-20 mA or 0-10 V signal from the control device into a valve opening via the actuator and positioner. The valve's flow characteristic (linear, equal-percentage, quick-opening) is selected together with the process gain to form a stable control loop.
Types of Control Valves
Globe control valves are the standard for precise throttling and lines requiring high pressure drop; in cryogenic applications they are used down to -196°C. Segmented ball valves, with their V-notch ball segment, offer wide rangeability and non-clogging operation on dirty fluids.
Pneumatic piston valves are preferred for fast-cycling on-off and simple control duties, while proportional-actuated butterfly valves are the economical choice for flow control on large-diameter lines.
Actuator and Positioner Selection
Pneumatic actuators achieve proportional control via a 4-20 mA electro-pneumatic positioner; spring-return models are chosen for fail-safe positioning on loss of air. Electric VR-E actuators, with 4-20 mA / 0-10 V proportional control, IP67/IP68 protection and an optional explosion-proof enclosure, handle control valve automation at facilities without compressed air infrastructure.
Datasheet