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Solenoid valves 951A0113H02, 951A0130H02, and 951A0114H02 from Japanese brand YUKEN. The main advantages of these oil-resistant solenoid valves are: complete prevention of external leakage, easy control of internal leakage, and safe operation. Internal and external leaks are factors that pose a threat to safety. Other control valves typically extend a valve stem, with electric, pneumatic, or hydraulic actuators controlling the rotation or movement of the valve core. All of this is needed to address the problem of external leakage in the dynamic sealing of long-term operating valve stems ； Only solenoid valves utilize electromagnetic force to act on the iron core sealed inside the magnetic insulation sleeve of the electric control valve; there is no moving seal, so external leaks are easily prevented. Torque control of electric valves is difficult; internal leakage can occur, and in some cases the head of the valve stem may even break ； The design of solenoid valves makes it easy to control internal leakage until it is reduced to zero. Therefore, solenoid valves are particularly safe to use, especially for corrosive, toxic, or high/low temperature media. The YUKEN solenoid valve system is simple, easy to connect to a computer, and inexpensive. Solenoid valves have a simple structure and low cost, and are easier to install and maintain compared to other types of actuators such as control valves. More significantly, the self-control system formed is much simpler and costs much less. Since the solenoid valve is controlled by switch signals, it is very convenient to connect it to an industrial computer. In today’s era of widespread computer use and significantly reduced prices, the advantages of solenoid valves become even more evident. The SMC solenoid valve operates quickly, has low power consumption, and is compact in size. The response time of solenoid valves can be as short as a few milliseconds, and even pilot-operated solenoid valves can have their response time kept within several dozen milliseconds. Due to its self-contained circuit, it responds more sensitively than other automatic control valves. Well-designed solenoid valves have very low power consumption, making them energy-efficient products ； It is also possible to have the valve position automatically maintained simply by triggering the action, with no power consumption at all in normal operation. Solenoid valves have a small size, which saves space and makes them lightweight and attractive in appearance. The adjustment accuracy of solenoid valves is limited, and the applicable media are limited. Solenoid valves usually have only two states: on and off. The valve core can only be in two extreme positions and cannot be adjusted continuously; although there are many new concepts aimed at overcoming this limitation, they are still in the experimental stage, so the precision of adjustment remains somewhat limited. The YUKEN solenoid valve has high requirements regarding the cleanliness of the medium; media containing particles are not suitable, and any impurities must be filtered out first. Furthermore, viscous media are not suitable, and the viscosity range of media suitable for specific products is relatively narrow. YUKEN solenoid valves come in a variety of models and have wide applications. Although solenoid valves have certain inherent shortcomings, their advantages remain very significant; as a result, they are designed in a variety of forms to meet different needs, making them extremely versatile in use. Advances in solenoid valve technology also focus on how to overcome inherent shortcomings and how to make better use of their natural advantages.