Solenoid valve sales in recent years has exceeded the control valve is mainly dedicated solenoid valve of the demand surge. Following categories according to the media to be introduced: (1) gas solenoid valve due to the adjustment of the fuel mix, the proportion of fuel gas is rising, demand for gas solenoid valve is also growing. Gas, natural gas, industrial gas, city gas, liquefied petroleum gas, such as a good variety of impurities and corrosion varied, the requirements of the valve is not the same. Moreover, the difference between pressure levels, compressed natural gas as high as 21 ~ 25Mpa, gas appliance pressure as low as 2Kpa. The Chinese were already mature product. It is worth mentioning that the dual-fuel vehicles in China, with sound environmental regulations continue to spread to 12 cities have converted a few thousand cars, and now multi-selection of complete sets of imported fuel for the device, the solenoid valve with the supporting imports. In fact these solenoid valve is not a foreign solenoid valve professional company production, performance test results are not entirely in line with China's gas industry technical standards. (2) steam solenoid valves steam solenoid valve must first solve the problem of high temperature, sealing materials, conductive and magnetic materials should be selected in particular. Corrosion of the steam pipe is more powerful, to be taken seriously. More important is that there are a lot of condensate in the steam pipe in the factory after work, the solenoid valve in the gaseous and liquid fluids through the action reliable, its delivery inspection Road have strict procedures. (3) water solenoid valve solenoid valve for water is always considered to be the easiest, but in reality the water is divided into several categories of tap water, industrial water, industrial wastewater, irrigation water, seawater, corrosion, cleanliness different should use different solenoid valve. The water valve is most common, but use different performance requirements of the valve is not the same. For example, fire electromagnetic valve, operating reliability is essential in case of failure lead to disastrous consequences. Even ordinary manual valves for long periods of opening and closing, it is difficult to quickly open. In recent years, high-rise buildings springing up, the fire solenoid valve technology also will mature. Another example, the waterworks must solenoid valve for siphon pipe, solenoid valve, but pressure state, but also in the vacuum state work reliably, there must be no internal leakage, and the cleanliness of the water is not high status , should remain flexible movement. In addition, the sprinkler solenoid valve with the development of China's agricultural and garden industry gradually been applied. (4) Oil range of oil types of solenoid valve seal technology is one of the keys. Oil and rubber just a class name, different oil or even the same kind of oil contained in the impurities on the need to choose different oil and rubber. For example, the ability of leaded gasoline is not necessarily resistant to unleaded gasoline. In recent years, with the increase in the sales of dedicated solenoid valve, the life of the special oil resistant rubber is also rising. The viscosity of oil vary widely, are required to use a different structure of the solenoid valve. High-viscosity oil is also often in the high temperature state of flow, so the solenoid valve will solve the problems of high temperature. For the fuel needed to meet explosion-proof requirements. In recent years, the company launched the gasoline, diesel, heavy oil and other kinds of special solenoid valves, has been widely applied. (5) air conditioning heating and cooling of the air-conditioning sub-system of the solenoid valve. Refrigerant changed significantly in recent years to gradually reduce ammonia and Freon, lithium bromide and other new types of refrigerant is gradually increasing, related to sealing, corrosion, life and other issues require carefully selection of appropriate design and advanced technology. It is worth mentioning is air-conditioned mainly by adjusting the air flow to control temperature and humidity, and continuous adjustment of the valve flow is not absolutely necessary. Now that the valve-free air-conditioning systems are also available, but problems such as condensation dripping while a reprimand. Therefore, the structure is simple, inexpensive solenoid valve is the most live choose. Due to foreign traditional ring Yiu valves for many years been a path of sustainable development, innovation development and growth. Central Yiu introduction of foreign advanced technology, lower costs, pay attention to quality, this is not just the needs of customers is the valve industry a must ring Yiu is a pioneer in the field. "Pioneers" of the ring Yiu active source of innovation. "Customer is God" is the spirit of enterprise, Central stunning self-improvement, courage and hard work and good team spirit of cooperation in industry, pave the way for future development. 
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 The impact of complex structure, the electric valve torque is difficult to control the domestic is still a lot of selection.