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Valve Positioner Types of pneumatic postioner Electro-Pneumatic Positioner smart valve positioner

Valve Positioner Types of pneumatic postioner Electro-Pneumatic Positioner smart valve positioner

According to the structure of Valve positioner, there are pneumatic valve positioner, Electro-Pneumatic Positioner and smart valve positioner. The positioner is the main accessories of valves, which is usually in combined use with the pneumatic control valve.

Description

Welcome to purchase discount source valve postioner types from our company, which is one of the best China valve postioner types manufacturers and suppliers.

According to the structure of Valve positioner, there are pneumatic valve positioner, Electro-Pneumatic Positioner and smart valve positioner. The positioner is the main accessories of valves, which is usually in combined use with the pneumatic control valve.

The input signal of Pneumatic valve positioner is a standard gas signal, for example, 20~100kPa gas signal and the output signal is also a standard signal.

The input signal of Electro-Pneumatic Positioner is a standard current or voltage signal, for example, the 4~20mA current signal or 1~5V voltage signal. The electrical signal is converted to the electromagnetic force in the internal Electro-Pneumatic Positioner, and then output the gas signal.

Intelligent Electro-Pneumatic positioner  will transfer the output current signals in the control room into the gas signal to drive the valve. According to the friction during the valve stem working, to offset the unbalanced force caused by the medium pressure fluctuation, so that the valve opening is corresponding to the output current signal from control room. And the corresponding parameters can be set up to improve the performance of the control valve.

According to the direction of action, the positioner can be divided into single way positioner and double way valve positioner.

One way valve positioner is for the piston actuator, and the valve positioner is only workable for one direction.

Two-way valve positioner is acting on both sides of the cylinder of the piston actuator, which Is workable in two directions.

Functions of positioner

(1) To adjust the important regulation system with high quality requirements so that it improves the positioning accuracy and reliability of the control valve.

(2) The positioner is for the situation with big pressure difference (p>1MPa) at the two ends of the valve. By increasing the pressure of the gas source to increase the output force of the actuator, in order to overcome the unbalance force of the valve core caused by liquid, and reduce the stroke error.

(3) The positioner is for large diameter (Dg>100mm) of the control valve to increase the output of the actuator thrust.

(4) Improve the flow characteristics of the control valve.

 

You may email to postmaster@wtindustrialeqpt.com for quotations or visit http://www.wtindustrialeqpt.com/product/positioner.html for more information.


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