[Science stickers] The difference and selection of electric valves and pneumatic valves

With the progress and continuous reform of the times, my country's valve products have also been innovated with the change of the times. At present, in the valve market where environmental protection and safety are becoming more and more demanding, the use of automatic control devices such as electric valves and pneumatic valves is gradually becoming indispensable. of. The use of self-control valves is more energy-saving and safer and more reliable. Compared with the traditional manual valve, the movement speed is faster than the ordinary valve, which not only reduces the manpower, but also greatly improves the work efficiency.  

Compared with the pneumatic valve, the electric valve has a simple structure and reliable operation, and its power source (power source or air source) is easy to solve for the remote operation point. The disadvantage is that the price is higher, and the explosion-proof requirements are also higher. When selecting, comprehensive consideration should be given to factors such as the availability, price and control requirements of the power source. The selection of the valve generally first confirm the valve material, valve diameter, medium type, pipeline pressure, connection method, control method, medium temperature and other parameters.

Electric valve selection

When electric valve is selected (the control mode of electric actuator is generally divided into on-off type and regulating type), in addition to the basic valve body diameter, pressure, material and other requirements, the following parameters should also be provided:  

1. Power supply parameters (including voltage, number of phases and frequency);

2. Running time and form of electric actuator;

3. Whether explosion-proof and explosion-proof grade are required;

4. Atmospheric protection level;

5. Overload protection requirements, such as over-travel protection, over-torque protection, etc.;

6. Local operation requirements, such as whether to bring a local operation handwheel;

7. Operation instruction requirements.   

Pneumatic valve selection

When selecting pneumatic valves (the operating principle of pneumatic actuators can be divided into single-acting and double-acting), in addition to determining specific parameters such as valve body diameter, pressure, and material, the following parameters should also be provided:  

1. Air source parameters (including air source pressure range, whether to bring your own gas storage tank, etc.)

2. Running time and form of pneumatic actuator

3. Whether explosion-proof and explosion-proof grade are required;

4. Atmospheric protection level;

5. Overload protection requirements, such as over-travel protection, over-torque protection, etc.;

6. Local operation requirements, such as whether to bring a local operation handwheel;

7. Operation instruction requirements.   

With the substantial increase in the level of industrial automation requirements, the demand for electric (pneumatic) valves is also increasing, and the control requirements for electric (pneumatic) valves have become more and more detailed and complex. The correct selection of electric (pneumatic) valves not only involves the correct use of the product, but may also affect the safety of the entire pipeline system. Users should understand and understand the relevant selection knowledge.

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