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The working principle of pneumatic valve


Release time:

2022-01-08

Pneumatic valveIt is a valve driven by compressed air. Pneumatic valve procurement only clear specifications, categories, pressure to meet the procurement requirements of the practice, can be used to control air, water, steam, all kinds of corrosive media, mud, oil, liquid metal and radioactive media and other types of fluid flow. In the current market economy environment is not perfect.

The working principle of pneumatic valve

     Pneumatic valveIt is a valve driven by compressed air. Pneumatic valve procurement only clear specifications, categories, pressure to meet the procurement requirements of the practice, can be used to control air, water, steam, all kinds of corrosive media, mud, oil, liquid metal and radioactive media and other types of fluid flow. In the current market economy environment is not perfect.

Because pneumatic valve manufacturers in order to product competition, each in the pneumatic valve unified design concept, different innovations, formed their own enterprise standards and product personality. Therefore, in the pneumatic valve procurement more detailed technical requirements, and manufacturers to achieve consensus, as the annex to the pneumatic valve procurement contract is very necessary. This type of valve in the pipeline should generally be installed horizontally.
Compressed air is used to push multiple groups of combined pneumatic pistons in the actuator to move, and the characteristics of transmitting force to the beam and the inner curve track are used to drive the air-core main shaft to rotate, and the compressed air air disc is transmitted to each cylinder to change the air inlet and outlet positions to change the rotation direction of the main shaft. According to the requirements of the rotation torque required by the load (valve), 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 the double-acting pneumatic actuator. The two-position solenoid valve is controllable in two positions: on-off, and the five-way solenoid valve has five channels for ventilation, one of which is connected to the air source, and two are connected to the air inlet and outlet of the external air chamber of the double-acting cylinder. The specific working principle can be referred to the working principle of the double-acting pneumatic actuator. Due to the increasing number of control methods and means, in the actual industrial life and industrial control, there are many methods used to control the pneumatic actuator, and the following are commonly used.
The intelligent display instrument is used to monitor the working state of the valve and control the valve during the execution period. It monitors the working state of the valve through two position sensors, judges whether the valve is in an open valve or a closed valve state, records the number of valve switches through programming, and has two 4 ~ 20mA outputs corresponding to the opening of the valve and two normally open and normally closed output contacts. Through these output signals, the valve is controlled to open and close.
Control system PLC is more and more widely used in control system. Since this scheme is developed on OMRON PLC, OMRON PLC is introduced. 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.
The specifications and types of pneumatic valves produced shall meet the requirements of the pipeline design documents. Pneumatic valve model should indicate the basis of the national standard number requirements. If it is an enterprise standard, the relevant description of the model should be indicated. The working pressure of pneumatic valve is required to be greater than or equal to the working pressure of the pipeline. Under the premise of not affecting the price, the working pressure that the valve can bear should be greater than the actual working pressure of the pipeline. Any side under the closed condition of pneumatic valve should be able to withstand 1.1 times the working pressure of the valve without leakage. Under the condition of valve opening, the valve body should be able to withstand twice the working pressure of the valve. Pneumatic valve manufacturing standards, should explain the basis of the national standard number, if the enterprise standard, the purchase contract should be attached to the enterprise documents.




 

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