Liquid control system – Positioner- right arm of Valves

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Liquid control system – Positioner- right arm of Valves

positioner

A liquid flow control system consists of three basic devices: positioner, control valve, and actuator. The positioner is responsible for closing or opening. Adjusting the amount of compressed air corresponding to the control signal into the actuator.

Put simply, the positioner is an integral part of the fluid flow control system.

A liquid flow control system consists of three basic devices: positioner, control valve, and actuator. Valve is responsible for closing or opening completely, changing the flow of fluid. The actuator is responsible for generating the appropriate force on the valve to control the position of the valve. The positioner is responsible for closing or opening. Adjusting the amount of compressed air corresponding to the control signal into the actuator. With the three components above, the flow of fluid is completely controllable.

  1. Types of Positioner

Positioner is diversified in terms of type and feature-friendly to meet the requirements and purpose of the factories.

Positioner is called the Analog Controller when the signal and the supply air are adjusted based on the principle. And the movement of the compressed air, spring, and magnetic force of the magnet.

The positioner is called the Digital Controller when all microcontroller processes, control are controlled by the microcontroller mounted on the board inside the Positioner, changing the settings as well as resetting the settings is an easy way with just one button. Moreover, Digital Positioner also has the ability to exchange information according to HART standard. Currently, Digital Positioner is being selected by many factories and used because of the utility that it brings.

For each type of actuator (Single, Double), there is also a generic positioner viagra online that matches the structure of the actuator. In the case of single, only one output of the compressed air source. When the pressure in the output is changed, the Actuator operates. When the source of compressed air pressure drops, the spring inside the Positioner will return to its original state.

In contrast

In the case of Double, there are two outputs of compressed air, one side of compressed air increases, the other side of the compressed air pressure decreases. The process of increasing and decreasing the compressed air to a position of equilibrium pressure locates the position of the Actuator.

The division into two types of motion is Linear, Rotary depends on Actuator and Valve movement. The opening and closing of the Valve due to the movement of the Stem axis is called Linear. Whereas the opening and closing of the Valve due to the rotation of the Stem shaft is called a Rotary.

In factories where fire and explosion prevention requirements are concerned, the Positioner is designed with the potential to prevent potential fire and explosion hazards. Positioners with explosion-proof features are designed to eliminate potential fire and explosion hazards. And to be used in such hazardous environments.

  1. Material constitutes Positioner

Positioner is made up of many different materials, listed below are some of the typical materials used:

     Base Aluminium Die Casting (ADC12)
    Cover Aluminium Die Casting(ADC12) hoặc nhựa PBT
    Armatuare  (Permalloy)
    Diaphragm, Packing, O ring  Rubber (NBR)

 

3. The operational principle of the Postioner Control valve

  1. Actuator

The purpose of the actuator valve is to accurately position the valve at the command of the control signal. The actuator accepts signals from the control system to move the valve to the closed position. Or to open the valve completely or partially.

  1. Postiner

Positioners ensure a linear relationship between the input pressure signal and the position of the control valve. Positioner uses signal amplifier. It accepts low pressure control (using higher inlet pressure) to increase the supply of high-pressure output to the actuator, ensuring the valve reaches the desired position. Several positioners can act as a basic controller, which can receive signals from the sensor.

  1. Learn about butterfly valves and pneumatic ball valves using positioner linear regulators.

As we already know the valve body is open and close, the actuator actuator has the function of opening. And closing the valve and the positioner is responsible for controlling the flow. So that the linear valve controller is suitable for the valve. Butterfly valve as well as ball valve.

Ball valve.

# Ball valve for pneumatic control, application and classification of pneumatic ball valve.

Compressed air ball valves are used for many factories, mechanical and electrical systems and waste treatment factories. Compressed air ball valve using remote control via PLC control cabinet. Compressed air ball valves are open and closed in ON / OFF mode and open angle regulation (linear control signal source).

Compressed air ball valves, also known as pneumatic ball valves, are operated by compressed air or by opening the valves. Dual-acting air control valve the air valve opens. And, when the valve is shut off, closes the case in the case of a single-acting spring return valve.

The material used to produce compressed air ball valves is varied to suit different working environments from chemicals, clean water, coal gas, heat … Typical stainless steel ball valve Compressed air ball valve or compressed air ball valve or pneumatic ball valve type 3 fall, 2 falls, 3pc and ball valve type pneumatic control.