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Selection principle of pneumatic directional control valve

Update:15 Apr 2021
Summary:

The pneumatic directional control valve is mainly used […]

The pneumatic directional control valve is mainly used to change the compressed air flow direction and the on-off state of the air flow, so as to control the action and state of the pneumatic components to change. What are the selection principles of the cylinder directional valve?
1: The scope of application of the selected valve should be consistent with the conditions of the site
That is to say, the valve that is suitable for reliable use under this condition should be selected according to the air source pressure, power supply conditions (AC and DC, voltage and fluctuation range), medium temperature, humidity, ambient temperature and humidity, dust, vibration, etc. of the use occasion.
2: Select the function and control mode of the valve
That is to say, the valve that meets the required function and control method should be selected according to the requirements of the pneumatic system for the number of positions of the components, the number of channels, the memory, the on-off state and the control mode when standing still, etc.
3: The flow capacity of the selected valve should meet the working requirements of the system
That is to say, the valve diameter should be calculated according to the requirements of the pneumatic system for the maximum instantaneous flow of the components and the average airflow speed of 15~25m/s, and the flow capacity C value (or Ky value), Cy value, and rated value of the required valve can be found. Based on the pressure drop under the flow rate, the standard rated flow rate and the S value, a valve that meets the system's flow capacity requirements is selected accordingly.
4: The performance of the selected valve should meet the working requirements of the system
That is to say, the valve that meets the required performance indicators should be selected according to the requirements of the pneumatic system for the lowest working pressure or the lowest control pressure, dynamic performance, highest operating frequency, continuous, energizing capacity, valve power consumption, life and reliability, etc.
5: The installation method of the selected valve should be comprehensively considered according to the quality level of the valve, the space requirement of the system and the ease of maintenance.
At present, the directional valve widely used in our country is a plate type installation method, which has the advantage of easy assembly, disassembly and maintenance. The IS0 standard also adopts the plate installation method and develops the container plate installation method. Therefore, it is recommended to prefer the panel installation method.
However, due to the continuous improvement of the quality and reliability of the components, the pipe-mounted valve occupies a small space and can also be installed in a container, so it has also been used. Therefore, when selecting, it should be determined according to the actual situation.
6: Try to use standardized products
Because standardized products adopt mass production methods, the quality is stable and reliable, the degree of generalization is high, and the price is cheap.
7 : The price of the selected valve should be compatible with the system level and reliability requirements
That is, the price of the valve should be considered according to the advanced degree and reliability requirements of the pneumatic system. On the premise of ensuring that the system is advanced, reliable, and convenient to use, we strive for reasonable prices and do not pursue low costs regardless of quality.
8: When designing large-scale control systems, it is necessary to consider the use of integrated valves and signal bus control types as much as possible.

Ningbo Lida Pneumatic Complete Co., Ltd is air cylinder Manufacturers and Pneumatic Solenoid Valve Suppliers,visit https://www.nblida.com/product/control-components/

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