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What is the working principle of pneumatic valves?

                       
Update:25-11-2020
Summary:

The compressed air is used to push the multiple sets of […]

The compressed air is used to push the multiple sets of combined pneumatic pistons in the actuator to move, and the force is transmitted to the crossbeam and the characteristics of the inner curved track to drive the hollow spindle to rotate. The compressed air disk is sent to each cylinder, and the air inlet and outlet positions are changed to change the spindle rotation. Direction, according to the requirements of the load (valve) rotation torque, the number of cylinder combinations can be adjusted to drive the load (valve) to work.
The two-position five-way solenoid valve is usually used in conjunction with a double-acting pneumatic actuator. The two positions are controllable in two positions: on-off. The five-way valve has five channels for ventilation, of which one is connected to the air source, and two are connected to the double The inlet and outlet ports of the outer chamber of the acting cylinder are connected, and the two are connected with the inlet and outlet ports of the inner chamber. The specific working principle can refer to the working principle of the double-acting pneumatic actuator. Due to the increasing number of control methods and means, there are many methods used to control pneumatic actuators in actual industrial life and industrial control. The following are commonly used.

High Frequency VF Series

 

Smart display

The intelligent display is an instrument used to monitor the working state of the valve and control the valve's execution period. It monitors the working state of the valve through two position sensors, judges whether the valve is in the open or closed state, and records the number of valve switches through programming , And there are two 4-20mA outputs corresponding to the valve opening and two-leg normally open and normally closed output contacts. Through these output signals, the opening and closing action of the valve is controlled.

Control System
The application of PLC in the control system is more and more extensive. Since this program is developed on OMRON's PLC, OMRON's PLC is used as an introduction.
Hardware composition: 1 computer, 1 set of PLC (including CPU, I/O module, ID212, OC224, AD003 module), 2 relays, 2 solenoid valves, 1 pneumatic valve actuator.
common enquiries
1. The specifications and types of pneumatic valves produced should meet the requirements of the pipeline design documents.
2. The model of pneumatic valve should be marked with the national standard number requirement. If it is a corporate standard, the relevant description of the model should be indicated.
3. The working pressure of the pneumatic valve is required to be ≥ the working pressure of the pipeline. Under the premise of not affecting the price, the working pressure that the valve can withstand should be greater than the actual working pressure of the pipeline; any side of the pneumatic valve should be able to withstand 1.1 times when the valve is closed The valve pressure value does not leak; when the valve is open, the valve body should be able to withstand twice the valve pressure.
4. Pneumatic valve manufacturing standards should state the national standard number on which it is based. If it is a corporate standard, the purchase contract should include corporate documents.

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