Positioner
A device mounted on a control valve actuator that receives the controller signal (4–20 mA or HART) and precisely positions the valve to achieve the required Cv. Pneumatic positioners supply air to the actuator; digital (SMART) positioners add diagnostics (valve signature, friction measurement).
Related Terms
Related Products
Actuators
Pneumatic and electric actuators for automated valve operation and control.
Accessories
Limit switches, positioners, solenoid valves, and other valve automation accessories.
Control Valves
Precision-engineered control valves for throttling, modulating, and flow control in critical process applications.
Frequently Asked Questions
What is a Positioner?
A device mounted on a control valve actuator that receives the controller signal (4–20 mA or HART) and precisely positions the valve to achieve the required Cv. Pneumatic positioners supply air to the actuator; digital (SMART) positioners add diagnostics (valve signature, friction measurement).
How is a Positioner sized for a valve?
Actuator sizing requires the valve's breakaway torque (BTO), running torque (RTO), and end-to-close torque (ETO) at the maximum differential pressure and operating temperature. The actuator output torque at minimum supply pressure must exceed the valve BTO by a safety factor (typically 1.25x minimum). For pneumatic actuators, the supply pressure range, fail-safe direction (spring return FC or FO), and speed requirements must also be specified.
When is a Positioner required versus manual operation?
Automation is required when: (1) the valve is in a remote or hazardous location, (2) rapid opening/closing is needed for emergency shutdown (ESD), (3) the valve must respond to a control signal (4–20 mA, HART, or fieldbus), (4) the operating torque is too high for manual operation, or (5) the valve is part of a Safety Instrumented System (SIS) requiring SIL certification. Contact Vajra Industrial Solutions for fully automated valve packages including actuator, limit switch, solenoid, and positioner.
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