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General manual device can only manually open the valve or manually close the valve, both fully equipped manual. Manual device can also preset the valve opening, the general manual only on the valve to the maximum or minimum opening preset, and fully manual, respectively, to the maximum or minimum opening preset. ZDF multi-function solenoid valve is a completely manual category. Other types of solenoid valves can be simple general-purpose manual devices as needed. 2.4 Specialized direction of development In recent years, sales of solenoid valves has exceeded the control valve, mainly for a variety of special solenoid valve surge in demand. The following are described by the media categories were: (1) gas solenoid valve due to the adjustment of China's fuel structure, the proportion of gas fuel rising, gas solenoid valve demand is also growing. Gas has natural gas, industrial gas, city gas, liquefied petroleum gas and many other kinds of impurities and corrosion conditions vary, the valve requirements are not the same. Moreover, the pressure levels vary greatly, compressed natural gas up to 21 ~ 25Mpa, while the gas pressure as low as 2Kpa. My country already has mature products respectively. The company's CE series gas solenoid valve has been exported to the EU. It is worth mentioning that dual-fuel vehicles in China with the sound and continuous promotion of environmental laws and regulations, 12 cities have been modified tens of thousands of cars, and now more is the choice of imported fuel supply device, which also with the solenoid valve Supporting imports. In fact, these solenoid valves are not foreign professional production of solenoid valves, performance test results do not all meet the technical standards of China's gas industry. The company already has a more reliable and inexpensive solenoid valve, is gradually replacing imported solenoid valve. (2) steamed steam solenoid valve steam wide steam to solve the problem of high temperature first, the sealing material, conductive and magnetic materials have to be a special choice. Corrosion of steam pipe is more serious and must be taken seriously. More importantly, there is a lot of condensate in the steam pipe after get off work in the factory. The solenoid valve needs reliable operation when both gaseous and liquid fluids pass through. There are many strict procedures for factory inspection. The company's ZQDF-3-type solenoid valve, 92 were listed as state-level new products, well tested by users, in recent years has introduced a compact CC series steam solenoid valve. (3) electromagnetic solenoid valve for water is always considered the most simple, but in fact the water is divided into tap water, industrial water, industrial wastewater, irrigation water, sea water and other categories, its corrosion performance, different levels of cleanliness , Should be selected respectively different solenoid valve. Although the most common tap water valve, but the use of different performance requirements of the valve is not the same. For example, the fire with a solenoid valve, the reliability of the movement is crucial, in case the consequences could be disastrous failure. Even if the ordinary manual valve does not open and close, it is difficult to quickly open. In recent years, high-rise buildings springing up, China's fire valve technology also will be mature. In another example, water plants need solenoid valve for siphon pipe, but this solenoid valve in the pressure state, but also reliable work in a vacuum state, must not have internal leakage, but also in the water is not clean condition Under the still flexible action. The company dedicated water valve solenoid valve in hundreds of water plants have been applied. China Water Association as the only recommended solenoid valve. In addition, sprinkler solenoid valve with the development of agriculture and landscape industry in China and gradually applied. (4) oil with a wide range of electromagnetic oil, seal technology is one of the keys. Oil-resistant rubber is only the name of the category, different oils and even the same type of impurities contained in different oil on the need to choose a different oil and rubber. For example, leaded petrol is not necessarily resistant to unleaded petrol. In recent years, with the increase of sales of special solenoid valve, special oil resistant rubber life also continue to increase. Viscosity of oil varies widely, to be used in different structures of the solenoid valve. High-viscosity oil is also often circulated in a state of high temperature, so the solenoid valve also will have to solve the problem of high temperature. The need to meet the explosion-proof fuel requirements. In recent years, the company launched one after another gasoline, diesel, heavy oil and other special solenoid valve, has been widely used. (5) Air conditioners with electromagnetic air conditioner heating and cooling. Significant changes in recent years, refrigerants, ammonia and freon gradually reduced, while the new type of lithium bromide refrigerant is gradually increased, the related sealing, corrosion, life and other issues require careful selection, reasonable design and advanced technology. It is worth mentioning that air conditioning mainly by adjusting the air flow to control the temperature and humidity, continuous adjustment of the valve flow is not entirely necessary. Now valveless air-conditioning system is also used, but condensation dew and other problems are condemned. Therefore, the structure is simple, inexpensive solenoid valve is the most live choice. Due to the influence of the traditional foreign, complex structure, difficult to control the torque electric valve is still a large number of domestic choice. In 1997, Chairman Mao Memorial Hall maintenance project to save the body so high-precision air-conditioning system selected the company's air-conditioning solenoid valve to obtain satisfactory results. Not long ago, the director of the Memorial Hall of the General Office of the CPC Central Committee also personally sent honorary certificates to the Company. In fact, it should be commended by the courage and wisdom of engineering designers. Third, the development of the solenoid valve technology-related social progress Previous scientific papers can only talk about technology, involving social management is easy to laugh. It is now a consensus that technological development depends on and promotes social progress. The author also engaged in technological inventions and management, talk about the relevant content that is necessary. Solenoid valve is an important industrial product directly related to enterprise safety production. In our country, there were serious accidents such as boiler explosion and fire failure because of poor quality of solenoid valve. The former Ministry of Machinery has long been listed as a permit solenoid valve permits the production and sale of products. Domestic licensed enterprises only about ten. Compared with large professional foreign companies, technical and economic strength there is a clear gap. After the reform and opening up, the private scientific and technological enterprises have risen, with patents approved by the United States, Japan and Europe. The products have gradually entered the markets of developed countries and the economic strength of SMEs has surpassed that of foreign counterparts. But as many as dozens of undocumented manufacturing enterprises, many designers fooled by fake and inferior quality mistakenly believe that the quality of China's solenoid valve is still not pass. The progress of the industry in recent years has produced the following welcome changes. (1) The mentality of worshiping foreigners is still serious, and the national self-confidence is constantly improving. The introduction of complete sets of equipment into the 80's brought a lot of solenoid valves, 90's famous foreign companies have set up offices in China, the selection of imported solenoid valve has become a self-control engineering fashion. Designers know that prices, delivery and after-sales service and other aspects of the imported products at a clear disadvantage, but ultimately choose it. Some are of course necessary. Some choose ordinary products from some small companies in Taiwan, South Korea, and Italy. Solenoid valve is different from the shuttle, after all, just a small product, in their own market, the Chinese are fully capable of dominant. In recent years, the satellite launch base, Daya Bay Nuclear Power Station, Shanghai Baosteel maintenance project of the company has won the solenoid valve, reflecting our national self-confidence rising. With the company's products exported to Europe, the French Science and Technology Quality Supervision and Evaluation Commission will also be the company and products listed as recommended to the EU companies and products. (2) Unfair competition is extremely serious, the concept of legal system is also constantly joining. Today's solenoid valve industry is extremely serious unfair competition, undocumented production, undocumented sales, counterfeit patents, counterfeit trademarks, counterfeit factory names, fake advertisements, fake products can be seen everywhere, consumers suffer. There was a solenoid valve can not move due to (YJ) trademark and asked the company exchange. A look at the connection flange for the 2 "and the actual path of less than 3Omm, known to be counterfeit counterfeit products.Now the designers are in the design of the certificate of production units, procurement staff also know that with the card unit and its license Distributors direct contact with the IS09000 quality system certification in recent years, gradually implemented in our country, we gradually consciously choose the certified business. All this shows that the concept of legal system is constantly strengthened. (3) electromagnetic wide selection complex, technical management Staff more dedicated. Solenoid valve has never been included in the self-control of professional textbooks, many people think that the selection is very simple, experienced designers to know this gadget to be taken seriously. Solenoid valve on the structure and principles of dozens of , And then consider a variety of technical parameters, as many as tens of thousands of cross-combinations.Design and procurement staff gradually learned to dazzle the correct choice, in addition to collect and study sample data, but also directly negotiate with manufacturers, bulk or important Personally inspect the economic and technical strength and technical assurance ability of the manufacturer, go deep into their original users, and understand the products on the ground Usage. Now everyone has economic accounting, but this is by no means a simple quotation comparison. In addition to the safe, suitable, durable, beautiful and other performance-affecting prices, but also with the entire automatic control system, the performance and cost of the pipeline system, This has become a comprehensive knowledge. The company has a technical services department, attaches great importance to pre-sales consulting, modeling and piping system design services. Design, procurement and management staff are highly responsible for their choice, their dedication to promote And promote the continuous development of the solenoid valve technology.China's solenoid valve in learning from foreign advanced technology, continuous innovation in its own development.Its development prompted people to constantly update their ideas.At the same time, only the social and legal system is more complete, the quality of the whole nation more , Solenoid valve technology to faster and better development.
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