쉐도잉 연습: What is a Control Valve? - 영상으로 영어 말하기 배우기
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The control valve receives a signal from a controller, such as a PLC or a DCS, in order to operate.
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The controller compares the actual flow rate to the desired flow value, called the setpoint.
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The controller will produce an output to move the valve to bring the flow rate to the setpoint value.
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A control valve is a power operated device used to regulate or manipulate the flow of fluids,
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such as gas, oil, water, and steam.
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It is a critical part of a control loop and is an example of a final control element.
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The control valve is by far the most common final control element used in industry today.
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A control valve can be operated electrically, pneumatically, or hydraulically.
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A control valve receives a signal from a controller, such as a PLC, in order for it to move, resulting in a change in flow.
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Because the PLC signal is electrical, the control valve may require a device to convert that electrical signal so that it can operate.
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A control valve has two separate components, the valve and the actuator.
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Valve bodies are of different types or styles depending on service conditions, piping layout, and desired application.
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The two classes of control valves are linear motion and rotary motion.
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On a linear motion valve, the stem and valve movement is up and down.
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A common type of sliding control valve is the gate valve.
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A rotary motion valve in almost all cases rotates 90 degrees from open to the closed position.
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A commonly used rotary valve is the butterfly valve.
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The actuator is the device connected to the valve through the valve stem that provides the force required to move the valve.
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As we said earlier, the actuator can be controlled electrically, pneumatically, or hydraulically.
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The most common and the most reliable is the pneumatic actuator.
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The control valve receives a signal from a controller, such as a PLC or a DCS, in order to operate.
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The controller compares the actual flow rate to the desired flow value, called the set point.
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The controller will produce an output to move the valve to bring the flow rate to the setpoint value.
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Because of how pneumatic actuators are built, a control valve will fail to a specific position when a loss of the control signal occurs.
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As the supply air pressure is increased, the rubber diaphragm pushes against the spring and moves the valve stem down into the valve body.
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As the supply air pressure is reduced, the spring will move the valve stem out of the body.
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The position to which the control valve is moved if a loss of signal occurs is referred to as the fail-safe mode.
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The type of fail-safe mode depends on the application for which the control valve is used.
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The actuator causes the valve to close in a fail-closed control valve.
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The actuator causes the valve to open in a fail-open control valve.
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In normal operation, the force of the spring must be overcome by the electrical or pneumatic actuator.
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In the event of a power failure to the actuator, the electrical or pneumatic force is no longer present, and the spring pressure forces the valve to open.
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You might wonder how much the valve opens or closes when the flow rate changes.
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Well, that depends on a number of things, such as the percentage of flow rate change, and the diameter of the pipe.
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Regardless, the controller must be tuned so that it produces the correct response to any change in flow rate.
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This is most commonly achieved by using PID control within the PLC or controller.
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We have already created several easy to follow videos on what a PID controller is.
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If you want to learn more about this topic, just head on over to realpars.com slash blog.
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Type in PID in the search bar and all the relevant articles and videos will pop up.
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We will also put a link in the description if you are watching this on YouTube or any other social media platform.
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In this video, we have learned
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that a control valve can vary the flow of a liquid or gas used in a process.
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We also learned that a control valve can be one of two main types,
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linear or rotary, and that we can use a fail-safe type of valve in critical areas.
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Finally, we introduced you to how control valves are controlled by the use of PID instructions in the PLC or DCS system.
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Want to learn PLC programming in an easy to understand format and take your career to the next level?
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Head on over to realpars.com Hey!
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"What is a Control Valve?"으로 쉐도잉 기법을 사용해 영어를 연습합니다.
매일 15~30분 꾸준히 연습하면 IELTS 스피킹에 대한 자신감이 길러집니다.
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쉐도잉(Shadowing)은 원래 전문 통역사 훈련을 위해 개발된 언어 학습 기법으로, 다언어 학자인 Dr. Alexander Arguelles에 의해 대중화된 방법입니다. 핵심 원리는 간단하지만 매우 강력합니다: 원어민의 영어를 들으면서 1~2초의 짧은 지연으로 즉시 소리 내어 따라 말하는 것——마치 '그림자(shadow)'처럼 화자를 따라가는 것입니다. 문법 공부나 수동적인 청취와 달리, 쉐도잉은 뇌와 입 근육이 동시에 실시간으로 영어를 처리하고 재현하도록 훈련합니다. 연구에 따르면 이 방법은 발음 정확도, 억양, 리듬, 연음, 청취력, 말하기 유창성을 크게 향상시킵니다. IELTS 스피킹 준비와 자연스러운 영어 소통을 원하는 분들에게 특히 효과적입니다.