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日期: 2019-03-20

Working Principle of Locator and Analysis of Common Faults

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Why should the control valve be fitted with accessories?

In the production process, the control system puts forward various requirements for valves. Therefore, the control valve must be equipped with various accessories to meet the production process.

Needs. The correct selection of valve accessories should be a useful guarantee and supplement to the function, safety and reliability of the valve, but if the selection is inappropriate,

It will bring many negative effects, so we should attach great importance to the selection.

What are the auxiliary devices of pneumatic control valves? What role does each play?

Valve positioners - including electrical valve positioners and pneumatic valve positioners, are used to improve the working characteristics of control valves and achieve correct positioning.

Valve Switch - Display upper and lower limit travel position of control valve.

Pneumatic retaining valve - Keep the valve in position when the air source fails.

Three-way and four-way solenoid valves - realize automatic switching of air circuit.

Handwheel mechanism - When the system is in trouble, it can be switched over for manual operation.

Pneumatic relay - to speed up the action of the actuator and reduce the transfer time.

Air filter pressure relief valve - used for air source purification and pressure regulation.

Storage Tank - When the gas source fails, replace it so that the valve can continue to work for a period of time.

What are the service requirements and accessories for valves?

In order to improve the static and dynamic characteristics of the control valve, the valve positioner should be equipped with the electric converter in order to convert the electrical and gas signals.

It is to keep the working power air source clean and maintain a certain pressure, it should be equipped with air filter pressure relief valve; when the air source is interrupted, in order to maintain the control valve.

For a certain pressure signal, the pneumatic retaining valve should be used to realize the self-locking of the stroke of the regulating valve.

In a word, the function of the accessories is to make the function of the control valve more perfect, more reasonable and more complete.


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