Search Results for: positioner
- Control Valve
Difference between Rotary-Shaft Valves & Sliding-Stem control Valves
Sliding-Stem Valves Sliding-stem valves include globe valves, angle valves, and axial flow valves. Of all the control valve types, the sliding-stem, globe style…
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What is Partial Valve Stroke Testing?
Introduction Partial Valve Stroke Testing or PVST, is an emerging concept to automatically increase the performance of Safety Instrumented Systems.…
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Control valve stroke checking
What is a control valve? Control valve is a power operated device which modifies the fluid flow rate in a…
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How to select a control valve Actuator ?
In this session we are gonna discuss about how to select a control valve actuators and we will briefly talk…
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How to choose a control valve? Conditions affecting control valve selection
What is a control valve? A control valve is a final control element used to regulate the flow of liquid…
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Different types of control valve actuators
Introduction Pneumatically operated control valve actuators are the most popular in use, but electric, hydraulic and manual Actuators are also…
Read More » - Instrumentation Questions
INSTRUMENTATION INTERVIEW QUESTIONS-CONTROL VALVES
Introduction Hello guys this session contains 25 interview questions about CONTROL VALVES.And if you need to know more about these…
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What are pneumatic controllers ?
Introduction A controller is a device that senses differences between a desired condition and measured condition in a process. .The…
Read More » - Control System
what is cascade control?
A simple control system drawn in block diagram form looks like this: Information from the measuring device (e.g. transmitter)…
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Working of control valve
Introduction The control valve is a controlled device that regulates the flow of a liquid or gas in a system.…
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