The essence must be simple, and only simplicity can flow for a long time. This is also the eternal pursuit of scientists and engineers. (1) Simplify the control loop In the past, pneumatic and electrical control loops were widely used in actuators, which increased the complexity of the system, while the pilot solenoid valve used the working medium itself to form the control loop in the valve, with a very simple structure. In the past, many technical parameters of solenoid valves at home and abroad were still limited, and the size of domestic solenoid valves has been expanded to 30Omm；; The medium temperature is as low as -200℃ and as high as 450℃; The working pressure is from vacuum to 25 MPa. The action time varies from ten seconds to several milliseconds. The new development of these technologies can completely replace the original bulky and expensive two-position control quick cut-off valve, pneumatic on-off valve and electric on-off valve, and can also partially replace the continuously adjusted pneumatic and electric regulating valves. (How to better meet the adjustment accuracy requirements will be discussed below). A large number of foreign textile, light industry, urban construction and other industries have switched to electromagnetic valves, and metallurgical, chemical and other industries have taken the lead in using electromagnetic valves in auxiliary systems. Domestic automatic control professionals pay more and more attention to solenoid valves. (2) Simplify the piping system. When the automatic control valve works, some auxiliary valves and fittings must be used in the pipeline. For example, the isolation bypass shown in Figure 1 is a typical installation method, which requires three manual valves, of which manual valve 1 is a bypass valve, which is reserved manually. Manual valves 2 and 3 are isolation valves to ensure online maintenance of automatic control valve 5. Of course, there must be two tees 4 and movable joints 6. This kind of piping system takes up a lot of space, takes time to install and is prone to water leakage. ZDF series multifunctional solenoid valves cleverly omit these additional accessories, and still have the function of isolating bypass, so they won the Geneva International Gold Award for New Technology. A filter should be installed before the automatic control valve. When multiple automatic control valves are used together, it is often necessary to install one-way valves to prevent interference between pipelines. One-way solenoid valve, combined solenoid valve and solenoid valve with filter all play the role of simplifying pipeline. (The company also introduced the backwashing filter valve, which has the functions of opening and closing and filtering, and can flush the filter element without disassembling the valve, and obtained the invention patent of China and the United States. (3) Simplified wide door structure and process The solenoid valve is an automatic control valve with simple principle and structure, but it needs to be further simplified. The structure and technology of solenoid valves for washing machines and refrigerators in household appliances industry are suitable for mass production. The coil assembly of ordinary solenoid valve has been plastic-sealed, which reduces the fault of lead-out wire breakage and easily meets the protection requirements such as waterproof and explosion-proof. The valve body, valve cover and other parts have adopted precision casting, forging and other processes, and engineering plastic solenoid valves have also been put on the market in batches. Domestic explosion-proof solenoid valve is not only flameproof, but also sealed and intrinsically safe. High-pressure and high-temperature solenoid valves also appeared, simplifying the structure and technology.
Develop in the direction of intelligence
How to better cooperate with SMC solenoid valve and intelligent instrument to improve the control accuracy and reliability of the system. It is generally believed that it is difficult to achieve high precision in position adjustment, but in many occasions, the required high precision can be achieved by adopting appropriate methods, which greatly saves the cost. (1) Double combined electromagnetic width. This is a combination of solenoid valves with different sizes. The metering accuracy of a large number of tankers is as high as 0.02%, and all of them adopt double solenoid valves. The large valve is opened, which makes the refueling close to completion in a short time; Then close the big valve and supplement the small valve to ensure the flow accuracy. This technology has been applied abroad for many years, and the products are made by ASCO Honeywell, a world-famous solenoid valve professional company. The double solenoid valves produced by our company reach the index of imported products and have unique performance. This product is not made by world-famous professional companies, because the market demand is not enough to arouse their interest. In fact, our oil depot adopts domestic large-flow double combination valve, and the effect will be much better. Double combination valves are also commonly used to control parameters such as temperature, pressure and liquid level. The large valve guarantees the basic quantity, and the small valve provides the compensation quantity. In a system with relatively stable parameters, this position control can achieve quite high accuracy. Many systems with large parameter changes, such as temperature control systems, are still affected by thermal inertia. (2) The valve cores of the three-position solenoid valve and digital valve have three working positions, which are not energized at ordinary times and are in a slightly open state, and the valves provide initial flow. When the electric signal is given, the solenoid valve is fully opened to provide large flow; Send another electrical signal and the valve will close. The valve also has a manual device, so when the valve is closed for a long time, there is no need to consume electricity. The three-position solenoid valve can be regarded as a more compact dual solenoid valve. It is convenient to realize three-position adjustment and has been applied in many applications. A further idea is that N electromagnetic valves with a certain proportion form 2n kinds of flows, which are similar to digital circuits and are called digital valves. In fact, two double valves or three-position valves with different sizes can produce 24= 16 or 32=9 kinds of flow, which has reached very high accuracy. In principle, it has advantages in matching with industrial computers, but this technology is still in the experimental stage because there is no large demand in the application field. (3) Self-sustaining electromagnetic broadband company has provided supporting facilities for many smart watch factories.