positioner

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작성자깜냥이 조회 9회 작성일 2021-12-30 05:21:34 댓글 0

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What are Valve Positioners?

Learn about the basic functionality and overall benefits to using valve positioners.
luis humberto ruiz betanzos : Positioners, like the ones you see here, are devices that allow us to accurately throttle the control valve at a desired setpoint. Many styles are available depending on the type of control valve you have. All positioners requiere two things for proper operation, input and feedback. Input is the control signal that provides a set point. Feedback indicates the current valve position. Let's take a closer look at position or operation in this animation. Input is provided by a pneumatic control signal to a bellows. As input is increased the bellows will expanded and act on a beam. The beam pivots and moves flapper in reaction to a nozzle as the flapper in relation to a nozzle as the flapper position has changed the nozzle pressure changes and operates a pneumatic relay. At this point we simply have a pressure to pressure transducer for input. To make it a positioner we must have feedback. The feedback ensures that the control valve is responding to the input and that the valve position corresponds to the given input signal. In this animation the feedback is provided from the control valve to the positioner by mechanical components. We're using a cam attachment to an arm that rotates as the valve strokes. The feedback also on the beam and is an opposing force to the input signal in the bellows. If an increased in input is made to the device, the bellows will again action the beam and move the beam and move the flapper closer to the nozzle. As nozzle and output pressures increase, the valve moves and feedback from cam acts on the opposite side of the beam moving the flapper away from the nozzle. The beam is summing component. The input and the feedback are both applied to the summing beam and area constantly compared to each other. If the forces are equal, the nozzle and the flapper relationship remains stable and the output pressure from the device is constant. The valve position is then maintained. If a change to one of the forces should occur, the flapper is again adjusted in a relation to the nozzle and output pressure change until both forces are change until both forces are once again equalized. If the positioner is properly calibrated, the valve position will correspond to a given control signal. For example, in this animation a 3 to 15 PSIG control signal is used for the input. At 3 psig our valve is fully open, at 9 psig travel will be 50% and at 15 psig the valve is fully closed. The positioner gives the control valve the ability to overcome valve friction and process force thet may cause position deviations. There are many additional benefits to using control valve positioner other than just stem position. Accuracy postioners are often selected to achieve throttling control of piston actuators, to accommodate non-compatible, control signals, to ensure proper shut off of the control valve, to enable split range ranging, and to change the gain characteristic of the control valve.
luis humberto ruiz betanzos : Los posicionadores, como los que ve aquí, son dispositivos que nos permiten regular con precisión la válvula de control en el punto de ajuste deseado. Muchos estilos están disponibles dependiendo del tipo de válvula de control que tenga. Todos los posicionadores requieren dos cosas para su correcto funcionamiento, entrada y retroalimentación. Inputo es la señal de control que proporciona un punto de ajuste. La retroalimentación indica la posición actual de la válvula. Echemos un vistazo más de cerca a la posición u operación en esta animación. La entrada es proporcionada por una señal de control neumático a un fuelle. A medida que aumenta la entrada, el fuelle se expandirá y actuará sobre una viga. La viga gira y mueve la aleta en reacción a una boquilla a medida que la aleta en relación con una boquilla a medida que la posición de la aleta ha cambiado, la presión de la boquilla cambia y opera un relé neumático. En este punto, simplemente tenemos un transductor de presión a presión para la entrada. Para convertirlo en un posicionador debemos tener comentarios. La retroalimentación asegura que la válvula de control está respondiendo a la entrada y que la posición de la válvula corresponde a la señal de entrada dada. En esta animación, los componentes mecánicos proporcionan la retroalimentación desde la válvula de control al posicionador. Estamos utilizando un accesorio de leva a un brazo que gira a medida que la válvula se mueve. La retroalimentación también en el haz y es una fuerza opuesta a la señal de entrada en el fuelle. Si se realiza un aumento en la entrada al dispositivo, el fuelle volverá a accionar el rayo y moverá el rayo y acercará la aleta a la boquilla. A medida que aumentan las presiones de la boquilla y la salida, la válvula se mueve y la retroalimentación de la leva actúa en el lado opuesto de la viga, alejando la aleta de la boquilla. La viga es un componente sumador. Tanto la entrada como la retroalimentación se aplican al haz de suma y al área constantemente comparadas entre sí. Si las fuerzas son iguales, la relación de la boquilla y la aleta permanece estable y la presión de salida del dispositivo es constante. La posición de la válvula se mantiene. Si se produjera un cambio en una de las fuerzas, la aleta se ajusta nuevamente en relación con la boquilla y la presión de salida cambia hasta que ambas fuerzas cambien hasta que ambas fuerzas se vuelvan a igualar. Si se realiza un aumento en la entrada al dispositivo, el fuelle volverá a accionar el rayo y moverá el rayo y acercará la aleta a la boquilla. A medida que aumentan las presiones de la boquilla y la salida, la válvula se mueve y la retroalimentación de la leva actúa en el lado opuesto de la viga, alejando la aleta de la boquilla. La viga es un componente sumador. Tanto la entrada como la retroalimentación se aplican al haz de suma y al área constantemente comparadas entre sí. Si las fuerzas son iguales, la relación de la boquilla y la aleta permanece estable y la presión de salida del dispositivo es constante. La posición de la válvula se mantiene. Si se produjera un cambio en una de las fuerzas, la aleta se ajusta nuevamente en relación con la boquilla y la presión de salida cambia hasta que ambas fuerzas cambien hasta que ambas fuerzas se vuelvan a igualar. Si el posicionador está calibrado adecuadamente, la posición de la válvula corresponderá a una señal de control dada. Por ejemplo, en esta animación se usa una señal de control de 3 a 15 PSIG para la entrada. A 3 psig nuestra válvula está completamente abierta, a 9 psig el recorrido será del 50% y a 15 psig la válvula está completamente cerrada. El posicionador le da a la válvula de control la capacidad de superar la fricción de la válvula y la fuerza del proceso que puede causar desviaciones de posición. Existen muchos beneficios adicionales al usar el posicionador de la válvula de control además de la posición del vástago. Los posicionadores de precisión a menudo se seleccionan para lograr el control de la aceleración de los actuadores de pistón, para acomodar señales de control no compatibles, para asegurar el cierre adecuado de la válvula de control, para permitir el rango de rango dividido y para cambiar la característica de ganancia de la válvula de control.
luis humberto ruiz betanzos : The feedback ensures that the control valve is responding to the input And that the valve position corresponds to the given input signal. In this animation the feedback is provided from the control valve to the positioner by mechanical components
Pasi Rahko : Great video. Well explained how control valve positioners work and the benefits of using them. Many thanks.
Mathew Carmichael : Another great video. That was an excellent visual animation of the feedback cam and flapper/nozzle relationship for a 3582.

Calibrating a Fisher™ 3582 Positioner - Zero and Span

Learn about proper calibration procedures, including zero and span, for the Fisher 3582 pneumatic positioner.

Steps include:
1. Move the flapper to the mid-range of its travel.
2. Apply a signal equal to the bottom of the input range.
3. Adjust the nozzle to make the needle on the output gauge sit softly on the zero pin.
4. Increase the input to find the low saturation point.
5. Increase the input and watch for the high saturation point.
6. Adjust the flapper assembly to set span and move the upper saturation point.

Additional Resources:
– Fisher 3582 Instruction Manual: http://emr.sn/3YH7
– Fisher 3582 Product Bulletin: http://emr.sn/n9PF
– Fisher 3582 Product Webpage: http://emr.sn/Kn5W

Thanks for watching! Please like, share, and comment on our video and make sure to subscribe to the Fisher Valves \u0026 Instruments channel.
q zorn : VERY NICE VIDEO... wished i had this back in 1970 when the learning class was going on with just a book... thanks...
M M : Is 3-15 standard for all valves or it depends on valve size?
Victor Thomas : Thanks for the video, but I have a normally closed valve, should the positioner be calibrated the same way?
luis humberto ruiz betanzos : Hi I'm Jim Jones with Emerson 3582 in this video I’m going to show you how to calibrate this Fisher 3582 pneumatic positioner, as you can see it’s already properly mounted under this Fisher 657 size 40 I direct-acting actuator and the beam alignment has been double-checked so now we're ready to set zero and span, the zero adjustment is done with the nozzle, and the span is adjustment by moving the flapper assembly along the summing beam, we of course have our air Air Supply Plumbed to the positioner and can see on the supply gauge the regulator is set to in this case 20 psi, to get started we’ll move the flapper assembly to the mid-range of it's travel on the direct side of the summing beam or about to the number 6 on the scale, understand that the direct and reverse labels on this summing beam only tell us how the position or will react to the input signal and have nothing to do with what kind of actuator the positioner is on, don't be confused by that, second will increase our input signal to the bottom of the input range in this case three PSI, third will adjust the nozzle in or out to make the needle on the output gauge sit Softly on the zero pin of the output pressure gauge, step four is to slowly increase the input pressure but we'll watch the output pressure gauge as soon as the output gauge needle moves I stopped the input and look at the input gauge ideally it should be somewhere between 3 and 3 and a half PSI, this technique makes certain that when the input is at 3 the position output is saturated to 0 psi and the control valve is at one end of its travel in this case all the way open, now let’s set in step 5 of increase the input pressure but again I'm watching the output pressure gauge what I'm looking for here is saturation on the other end of the stroke, Saturation is identified when the output pressure rapidly changes and goes all the way to supply pressure, there it is, that means the valve has hit a stop and the positioner is applying full Supply to in this case provide maximum seat load, our goal is to make the position or saturate just inside the upper limit of our input signal that is in this case 15 psi, so when it's saturates ideally it should be between 14 and 1/2 and 15 psi, if we increase the input pressure in the output saturates just before or after our Target, which is just under 15 PSI we must move the flapper assembly to correct span and move the saturation point, this is step 6, if it saturates too soon or before 14.5 move the flapper assembly to smaller number, if it saturates too late or above 15 move the flapper to a large number every time you move the flapper assembly though you must go back and reset the zero adjustment and then check the span again when the 3582 positioner is properly calibrated we can be sure that when the input signal is at the limits in this case three and fifteen PSI we know that the valve is either wide open or in the seat with full actuator force, once the zero and span is set correctly don’t forget to tighten up all the lock nuts, so we can calibrate the 3582 positioner in just six steps,

Step one, move the flapper to the midrange of its travel
Step two, Apply a signal equal to the bottom of the input range
Step Three, Adjust the nozzle to make the needle on the output gauge sit softly on the zero pin.
Step four, Increase the input to find the low saturation point
Step five, Increase the input and watch for the high saturation point
Step six, Adjust the flapper assembly to adjust span and to move the upper saturation point.
intellectual Raccoon : thanks a lot this is very informative.

What is Positioner in Pneumatic actuators Control Valve?|Positioner Working Principle

This video describe What is Positioner in pneumatic actuator Control Valve? and Positioner working principle with basic functionality and overall benefits to using valve positioner.

After you completion this video you can know the following :-

1- control valve positioner working,
2- control valve positioner working principle,
3-control valve positioner function,
4-how control valve positioner works,
5-control valve positioner parts,
6-control valve positioner,
7- control valve with positioner

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zoza mody : very useful
Jake Romero : I love it. Thanks a lot.
Ratman Bejo : what are the advantages of pneumatic control valve compared to motorized
Don Will : Wow, so surprised that the cover of this video uses our control valves photo. And thank you so much for your share this video.
Abhishek Sopan Shelar : Valve positioner is analog output ? With respect to the controller

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#positioner

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