Analysis of the choice of miniature solenoid valve in medical applications

Electronic enthusiasts core tips: Instrument design engineers will always use various types of electromagnetic components on the instrument. The choice of these precision components has a great impact on the realization of medical, environmental protection and analytical instrument functions. Most engineers need to weigh various application factors to consider the most suitable electromagnetic components. The pursuit of small size of the instrument makes the design industry must use smaller and more durable components. Improper selection may cause the instrument to malfunction or fail to work at all. Engineers need to consider not only the reliability and durability of the components, but also their lightness, effective flow rate and low power consumption. This report is an experienced team of application engineers from the roots of design and manufacturing to elaborate the parameters of selecting miniature solenoid valves And pointed out that those are the key parameters in the application, and it also shows that professional valve application experience will reduce or avoid doubts caused by the choice.

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Ensure reliability and repeatability

When instrument design engineers choose miniature solenoid valves, they often hope that the components can be operated very reliably and repeatedly, especially to ensure long-term stability and repeatability. It is best to hope that there will be no operation fluctuations or exceptions for a long time. Often become the first parameter for screening precision components.

For example, the choice of isolation valves used in the blood cell sampling channel and the counting channel usually affects the repeatability of the whole machine. The more uniform the response time of the quaternary gradient isolation valve in high performance liquid chromatography is, the easier it is to meet the test requirements. There is an intuitive difference in detection sensitivity and repeatability.

Even an early selection of original parts may cause serious and unpredictable consequences. The later this design flaw is discovered, the higher the cost of modification. Because when you need to replace components, you need to start a series of tests again. Therefore, in this case, engineers generally use high-reliability components, and pay special attention to the production process of valves, quality inspection and test control.

In particular, the design of the valve will directly affect the reliability of the device itself. For example, in analytical testing instruments, the solenoid valve directly contacts the sample reagent, but most miniature isolation valves have an internal rubber material, which may be encountered when contacting the sample reagent Swell. If you do not consider any pre-compensation in design, the rubber material will change the valve parameters and performance after long-term use, and even affect the components to not work properly, resulting in the problem that the entire instrument cannot work. Experienced component designers will consider the application range of the valve, especially the impact of the actual application of the compatibility of chemical substances on the valve.

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