Solenoid valve as an instrument of automation, in recent years a sharp increase in the amount. This paper analyzes the main features of the solenoid valve, and focusing on the application of the angle of the development of the domestic mature technology to make a brief overview, respectively, in the streamlined, intelligent, universal, dedicated direction made a survey, and slightly affect the solenoid valve technology Development of social factors for some discussion. First, the main features of the solenoid valve (1) leakage block, easy to control leakage, the use of safety. Internal and external leaks are elements that endanger safety. Other self-control valve stem usually stick out by the electric, pneumatic, hydraulic actuator control spool rotation or movement. This must solve the long-term action of the valve stem seal leakage problem; only the electromagnetic valve is the role of electromagnetic force sealed in the magnetic separation within the sleeve to complete the core, there is no dynamic seal, so easy to block leakage. Electric valve torque control is not easy, prone to internal leakage, and even pulled off the stem head; structure of the solenoid valve easy to control the internal leakage until it drops to zero. Therefore, the use of special safety solenoid valve, especially for corrosive, toxic or high temperature medium. (2) The system is simple, then the computer, low prices Qian. Solenoid valve itself is simple, the price is low, compared to other types of actuators such as regulating valve easy to install and maintain. Even more remarkable is the composition of the control system is much simpler, the price is much lower. As the solenoid valve is the switch signal control, and industrial computer connection is very convenient. In today's popularization of computers, the price plummeted era, the advantages of the solenoid valve even more pronounced. (3) action express delivery, power is small, lightweight appearance. Solenoid valve response time can be as short as a few milliseconds, even the pilot solenoid valve can be controlled within a few tens of milliseconds. Since the self loop, more responsive than other self-controlled valves. Well-designed solenoid valve coil power consumption is very low, is an energy-saving products; can also be done only trigger action, automatically maintain the valve position, usually do not consume electricity. Solenoid valve small size, saving space, but also lightweight and beautiful. (4) regulation accuracy is limited, the applicable medium is limited. Solenoid valve usually only switch two states, the spool can only be in two extreme positions, can not be adjusted continuously (trying to break a lot of new ideas, but are still in the trial stage of the trial) so the regulation accuracy is subject to certain restrictions. Solenoid valve on the media have a higher cleanliness requirements, including granular media can not be applied, in the case of impurities must be filtered out. In addition, viscous media do not apply and the range of medium viscosities for a particular product is relatively narrow. (5) Model variety, wide range of uses. Although solenoid valve inherent deficiencies, the advantages are still very prominent, so it is designed into a wide range of products to meet a variety of different needs, the use of a very wide range. Solenoid valve technology is also progress around how to overcome the inherent deficiencies, how to better play its inherent advantages and expand. Second, the development of solenoid valve technology Introduction Solenoid valve technology 2.1, streamlining the direction of development to the best to be Jane, only a simple ability to spread for a long time. This is also the permanent pursuit of scientists and engineers. (1) Simplifying the Control Circuit The conventional actuators used a large number of pneumatic and electric control circuits, which increased the complexity of the system. The pilot solenoid valve formed a control circuit using the working medium itself in the valve. The structure was very simple. Solenoid valve in the past a number of technical parameters are still limited, and now the domestic solenoid valve diameter has been extended to 30Omm; medium temperature as low as - 200 ℃, up to 450 ℃; working pressure from the vacuum to 25MPa. Action time from a few seconds to a few milliseconds. The new development of these technologies can completely replace the existing bulky and expensive two-position controlled quick shut-off valves, pneumatic on-off valves and electric on-off valves, and can partially replace continuously-regulated pneumatic and electric control valves. (How to better meet the regulatory requirements of precision, but also below). Foreign textile, light industry, urban construction and other industries have switched to a large number of solenoid valves, while the metallurgical and chemical industries take the lead in the auxiliary system to use more and more solenoid valves. Domestic self-control professional and technical personnel have been more and more attention to the solenoid valve. (2) to simplify the piping system Automatic control valve work in the pipeline must be equipped with a number of auxiliary valves and fittings. For example, the isolated bypass shown in Figure 1 is a typical installation. There are three manual valves, manual valve 1 is bypass valve, manual standby. While manual valves 2 and 3 are isolation valves to ensure the on-line maintenance of the automatic control valve 5. Of course, you have to have two tees 4 and union 6. This pipeline system occupies a large space, installation and time-consuming, but also easy to leak. ZDF series of multi-function solenoid valve cleverly eliminates the need for these additional accessories is still isolated bypass function, which won the Geneva International Gold Award for new technologies. Automatic control valve in front of the need to install filters. It is also often necessary to install check valves to prevent interference between pipes when using multiple self-contained valves. Now, one-way solenoid valves, combination solenoid valves and filtered solenoid valves have all played their part in simplifying piping.