310104d Valve Positioners 2025 (TF) (1)

Valve Positioners

Devices that accurately measure and control the position of a valve stem.

Dead Band

A condition where the signal to the valve actuator changes without a corresponding change in the valve plug position.

Fisher 3610J

A specific model of a valve positioner known for its accurate measurement of valve stem position.

Feedback Mechanism

A system that communicates the position of the valve stem back to the positioner.

Quick Response Time

The ability of a valve positioner to adjust and react to changes rapidly due to its greater output volume.

Reversing Acting Operation

An operation where an increase in input signal results in a decrease in output signal.

Split Range Operation

A method that allows one input signal to control two positioners for improved signal management.

Springless Actuator

An actuator that does not use a spring, allowing the positioner to control valve positioning without spring force.

I/P Transducer

A device that converts an electrical signal (4-20 mA) into a pneumatic signal for controlling valve position.

Smart Valve Positioners

Advanced positioners that use microprocessor technology to calibrate and diagnose themselves.

Calibration

The process of adjusting the positioner to ensure accurate valve function and performance.

Hysteresis

The lag between the input and output of a system, which can affect valve performance.

Maintenance Procedures

Steps taken to ensure the proper functioning and servicing of valve positioners over time.

PPE (Personal Protective Equipment)

Safety gear worn to minimize exposure to hazards during servicing or maintenance.

Pneumatic Relay

A device that controls pneumatic signals in valve positioners, often needed for operation.

Troubleshooting

The process of identifying and resolving issues in the valve positioner performance.