Search Results for: positioner
- Control Valve
What are the parts of control valves and what are the accessories used in control valves
Why do we need control valves Control valves are used to control the flow of the liquid, it can regulate…
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What is a control valve and how does it work
What is a valve A valve is a device that can be used to control the flow of the fluid,…
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How to select an actuator for valve?
The actuator is an essential part of the control valve, which drives the control valve stem. In order to select…
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Control valve Air Lock
What is Air lock valve? Air lock-up devices should be provided for all services requiring that the control valve remains…
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How a Valve is controlled using a 4-20mA loop
Table of ContentsSignal conversionControl Valve Connection 4-20 mA Current LoopParts of 4-20 mA Current loopSensorTransmitterPower SourceLoopReceiverAdvantages & Disadvantages of 4-20…
Read More » - Interview Questions
Field instrumentation interview Questions and answer
What are the different process variables? Flow. Pressure. Temperature. Level. Quality i.e. % O2, CO2, pH etc Flow, pressure, temperature…
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What is a Stepper Motor?
What is a Stepper Motor? Stepper motors are DC motors that move in discrete steps. They have multiple coils that…
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Control valve parameters
The control valve is the instrument used to control or regulate the flow of fluid. For controlling of the…
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What is a PID control action?
TWhat is a controller and why is it required in a process system?What is a PID controller?What is the need…
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HART transmitter calibration procedure – For pressure transmitter
For a conventional 4-20 mA instrument, a multi-point test that simulates the input and measures the output is sufficient to…
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