1. The scope of application of the selected valve should be consistent with the conditions of the use site.
That is, it should be selected according to the air source pressure, power supply conditions (AC, DC, voltage and fluctuation range), medium temperature, humidity, ambient temperature and humidity, dust, vibration and so on
2, the function and control mode of the selected valve should meet the working requirements of the system
That is, the valve that meets the required function and control mode 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 when standing and the control mode.
3, the circulation capacity of the selected valve should meet the working requirements of the system
That is, according to the requirements of the instantaneous maximum flow of the components of the pneumatic system, the diameter of the valve should be calculated according to the average air speed of 15 ~ 25m/s, and the flow capacity of the required valve is found to be C value (or KV), the pressure drop under the rated flow rate of the CV value, the standard rated flow rate and S value, etc., and the valve that meets the requirements of the flow capacity of the system should be selected accordingly.
4, the performance of the selected valve should meet the working requirements of the system
That is, the valve that meets the required performance indicators should be selected according to the minimum working pressure or minimum control pressure of the pneumatic system, dynamic performance, maximum working frequency, continuous power-on ability, valve power consumption, life and reliability.
5, the selection of valve installation method should be based on the quality level of the valve, system space requirements and easy maintenance, such as comprehensive consideration of the current wide application of the reversing valve plate installation method, its advantage is easy to install and disassemble and maintenance, ISO standard also uses the plate installation method, and the development of the packaging plate installation method. Therefore, it is recommended that the panel installation is preferred. However, due to the continuous improvement of component quality and reliability, the tubular installation valve occupies a small space, and can also be assembled, so it has also been applied. Therefore, the selection should be determined according to the actual situation.
6, try to choose standardized products
Because the standardized products use mass production means, the quality is stable and reliable, the degree of universality is high, and the price is cheap.
7, the price of the selected valve should be commensurate with the system level and reliability requirements, that is, the price of the valve should be considered according to the advanced level of the pneumatic system and reliability requirements. Under the premise of ensuring the advanced, reliable and convenient use of the system, we strive to have a reasonable price, and do not pursue low cost regardless of quality.
8, large control system design, to consider the use of integrated valves and signals of the bus control type
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