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Micro solenoid valve option principle

To ensure reliability and repeatability; when the instrument design engineer chooses a miniature solenoid valve, he or she often expects the components to operate reliably and repeatedly, especially to ensure long-term stability and repeatability. It is best to expect that there will be absolutely no any time. Operational fluctuations and exceptions occur, and this often becomes the first parameter for screening precision components.

For example, the selection of the isolation valve used on the blood sampling channel and the counting channel usually affects the repeatability of the whole machine. The quaternary gradient isolation valve in the high-performance liquid chromatography needs more uniform response time to achieve the test requirements more easily. Sex, there is an intuitive difference in the detection of sensitivity repeatability.

Even if one of the benefits of the early selection of the original accessories, it may lead to serious and unpredictable consequences. The later the design defect is discovered, the higher the modification cost. Because when you need to replace components, you need to re-test a series of tests. Therefore, in this case, engineers generally use components with high reliability, and will pay special attention to the production process, quality inspection, and test and control of the valve.

In particular, the design of the micro solenoid valve will directly affect the reliability of the device itself. For example, in the analytical test instrument, the micro solenoid valve directly contacts the sample reproduct, but most micro isolation valves have an internal rubber material, and are in contact with the sample reproduct. It may swell. If you do not consider any design of pre-compensation, then long-term use of rubber material will therefore change the micro-magnetic valve parameters and performance, or even affect the components to work properly, resulting in the entire instrument can not work. Experienced component designers will consider the scope of application of the valve, especially the impact of practical applications such as chemical compatibility on the valve.

Ensure a longer service life; Continuous service life is a parameter that micro solenoid valves should consider first in most applications, especially in certain applications that require a longer continuous service life. For example, in medical equipment and high-running instruments, the equipment requires continuous operation, requiring the device to have the lowest number of failures or even zero even if it is used for a long time. Frequent maintenance and replacement of valves are best avoided. The continuous high service life also means that the components have better reliability under complex and variable applications.

In fact, high-reliability service life guarantee is difficult to achieve. Experts with valve design have mentioned that the most troublesome service life is to move the sealed membrane, that is, the diaphragm design. Whenever the valve is working, the diaphragm will be pulled by the pull rod. After several millions of reciprocating movements, the push rod pulls the diaphragm will be worn. Most valves will have this kind of situation. Some manufacturers change the push rod or Membrane material design to solve.

Experienced application engineers consider reducing the diaphragm deformation when considering long service life. This ensures a smoother contact surface and less impact force, especially when compared to metal valve bodies. Plastic body and plastic push rod have better durability. It should also include life-related factors including the application of the liquid, the time the valve needs to be continuously energized, certain extreme use cases, or the application differences caused by various types of influencing factors. Some manufacturers will test the life of 500,000 times, but some manufacturers have achieved tens of millions of life.

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