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New Development of Solenoid Valve Technology in China
Abstract: Solenoid valve as an instrument of automation, in recent years, the sharp rise 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 problems; 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 briefing 2.1, streamline the development of the direction of the best to be Jane, only a simple ability to long-term spread. 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. (The company also introduced the recoil filter valve, and the switch and filter function, and without having to remove the valve can flush the filter, won the Sino-US invention patent.) (3) to simplify the valve structure and process Solenoid valve is the principle and structure are Simple automatic control valve, but also to further simplify. Household appliances washing machines, refrigerators equipped with solenoid valve, the structure of parts and processes are suitable for mass production. Ordinary solenoid valve coil components have been used plastic package to reduce the failure of lead wire failure, easy to achieve waterproof, explosion-proof and other protection requirements. Valve body, bonnet and other components have been used precision casting, forging and other technology, engineering plastic solenoid valve has also been listed in bulk. Domestic explosion-proof solenoid valve is not just Flameproof, as well as encapsulated type, intrinsically safe type. High-pressure and high-temperature solenoid valve also appeared to simplify the structure and technology. 2.2, the development of intelligent direction This mainly refers to the solenoid valve with smart meters better to improve the system control accuracy and reliability. It is generally considered difficult to achieve very high bit-position adjustment accuracy, however, in many occasions the proper way can achieve the required high accuracy, and significant cost savings. (1) double combination of electromagnetic wide. This is a combination of solenoid valves of different sizes. A large number of tanker oil metering accuracy of up to 0.02%, are used double solenoid valve. Open the large valve, making refueling in a relatively short period of time near completion; then the valve closed, supplemented by a small valve to ensure flow accuracy. This technology has been applied abroad for many years, the products by the world-renowned professional solenoid valve manufacturer ASCO Honeywell and other companies. Now the company produces double solenoid valve has reached the target of imported products, as well as unique performance. By the way, it is pointed out that the measurement of the large flow in domestic oil depots is still introducing or imitating foreign complicated multi-stage shut-off valves with less stable performance. Such products are not manufactured by world-renowned professional companies because the market demand is not enough to attract them interest. In fact, our oil depot with a large domestic production of dual-valve portfolio, the effect will be much better. Double combined valve is also commonly used to control temperature, pressure, liquid level and other parameters. Large valve to ensure the basic amount of valve to provide compensation. In relatively stable parameters of the system, this bit-type control can be quite high precision. For systems with large parameter variations, the rate of change is still subject to certain constraints, such as temperature control systems, which are still affected by thermal inertia. Therefore, the proper use of double combined valve to meet the control requirements of the premise relative to the control valve can significantly reduce costs. (3) Three-position solenoid valve and three-position solenoid valve The three-position solenoid valve has three working positions. Normally, it is not energized and is in the state of micro-opening. The valve provides initial flow. To an electrical signal, the solenoid valve is fully open, ; To another electrical signal, valve off valve. The valve also comes with a manual device, making long-term off the valve without electricity. Three solenoid valve can be seen as a more compact structure of the double solenoid valve, it is easy to achieve three-bit regulation, has been a lot of applications. ZDF multi-function solenoid valve further idea is that the size of n into a certain proportion of the solenoid valve 2n kinds of flow, similar to the digital circuit called the combination valve for the digital valve. In fact, two different sizes of two or three valves can produce 24 = 16 or 32 = 9 kinds of flow, has been able to achieve very high accuracy. In principle, it has advantages with industrial computer, but due to the large number of applications that have not been put forward, this technology is still in the experimental stage. (3) Since the maintenance of electromagnetic solenoid valve self-holding solenoid valve is just an instantaneous switch to complete the valve action, the spool position without electricity to maintain. It has the advantage of saving energy, especially when using batteries as power supply, and can not consider the temperature rise, so the coil has a long service life and high safety at high and low temperature and explosion proof. Common mechanical holding and permanent magnet to maintain, and is divided into double coil and single coil, with a single magnetic coil to keep the structure is the most simple. It is to change the polarity of the DC power supply corresponding to the valve switch to change the two states. This solenoid valve installed separately coil external wiring need to add the switch, and with the smart meter is very convenient. IC card pre-paid gas meter and the meter is equipped with a solenoid valve is one of the keys to the success of the instrument, which self-sustaining technology is an important factor in the success or failure of the solenoid valve, the domestic self-sustaining electromagnetic has matured, the company has more Smart watch factory to provide support. 2.3, the development direction of the general direction Solenoid valve is widely used, but the use of the situation is vastly different, enhance the universal performance and reduce manufacturing, purchase and sale, storage, installation and maintenance costs, in recent years this has taken a big step. (1) Adjustable response time to give the electrical signal to the valve core action completed time is called the response time. Different occasions, I hope the switch speed is different, there are four combinations: Quick-open fast-closing ---- for quick reaction system; Quick slow-closing ---- for the prevention of water hammer; Quake off; slow to slow one by one for a smooth transition. ZDF multi-function solenoid valve can adjust to any state, the application is very flexible. (2) expansion of the medium applicable standard solid. Solenoid valve and other self-control valve is different in medium viscosity range is narrow, so the air, water, steam, oil and other media for the pilot solenoid valve its structural parameters are different; generally can not be universal. The ZDF multi-function solenoid valve with only a small screw, but it has gas, water, oil, universal, but also greatly expand the scope of oil viscosity, popular. (3) adjustable opening and moving and kiln solenoid valve often use it also want to have both manual functions, as a power outage or failure backup. 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, the direction of specialization In recent years the sales of solenoid valves have exceeded the control valve, mainly a variety of special solenoid valve demand surge. 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 designers are in the design of the certificate of production units, procurement staff also know that with the permit unit and its license Distributors direct contact with the IS09000 quality system certification in recent years, gradually implemented in China, 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 of production plants and technical assurance capabilities, in-depth their original users, on the ground to understand the production However, this is by no means a simple quotation comparison, except for the fact that the performance such as safety, application, durability and aesthetics affect the price, as well as the performance and cost of the entire automatic control system and piping system , Which has become a comprehensive knowledge of 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 Spirit 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 legal system is more complete, the quality of the people To improve, solenoid valve technology to faster and better development.