Tag Archives: Gas Safety Valves

 Solenoid valve as an actuator for automated instrumentation in recent years, the amount is rising sharply. This paper analyzes the main features of the electromagnetic valve, and application-oriented point of view for a brief overview of the developments of the mature technology, streamline, intelligent, universal, were made by the special direction of inspection, and slightly affect the solenoid valve technology the social dimension of development points.

    The main features of a solenoid valve

    (1) leakage of the block must drain easily controlled, safe to use. Inside and outside the leaks endanger the safety factor. Other automatic control valve will usually stem extends from the electric, pneumatic, hydraulic actuator control spool to rotate or move. This is all to solve the long-term actions stem outside the dynamic seal leakage problem; only the solenoid valve is used to seal the casing separated from the magnetic core to complete electromagnetic masterpiece, there is no dynamic seal leakage so easy to block absolutely. Electric control valve torque is not easy and prone to leakage, and even pulled off the stem head; the structural type of the solenoid valve is easy to control leakage, until reduced to zero. Therefore, the solenoid valve to the use of special security, especially for corrosive, toxic or high and low temperature media.

    (2) The system is simple, they take the computer, the price is low and modest. Solenoid valve structure is simple, low price, easy installation and maintenance compared to other types of control valves and other actuators. More significant is the automatic control system is much simpler and a much lower price. As the solenoid valve switching signal control and industrial computer connection is very convenient. Popular in today\\ s computer prices an era of declining, the solenoid valve is even more obvious advantages.

    (3) action express, power tiny, lightweight shape. Solenoid valve response time can be as short as a few milliseconds, even if the pilot solenoid valve can be controlled within tens of milliseconds. Forming the circuit, and more responsive than the other automatic control valve. Properly designed solenoid valve coil power consumption is very low, the case of energy-saving products; can also be done simply trigger movement, and automatically maintain valve position, and usually is not power consumption. Solenoid valve small size, saving space and lightweight appearance.

    (4) regulation accuracy is limited for the media is limited. The solenoid valve is usually only switch the two states, the spool only in the two extreme positions can not be adjusted continuously, (trying to breakthrough a lot of new ideas, but also in the experimental trial stage) regulation accuracy also subject to certain restrictions. Solenoid valves have a higher requirement for media cleanliness, containing granular media can not be applied, in the case must first filter out impurities. In addition, the viscous media can not be applied, and a relatively narrow range of a particular product is suitable for medium viscosity.

    (5) model and diverse, and versatile. Although the solenoid valve deficiencies, the advantage is still very prominent, so we designed a wide variety of products to meet the various needs and used widely. Solenoid valve technology advances are around how to overcome the deficiencies, how to better play to the inherent advantages commence.

Second, the solenoid valve technology development profile more solenoid valve technology

    2.1, the streamline direction to the development of fine shall be simple, only a simple long-lasting circulating. This is also the permanent pursuit of scientists and engineers.

    (1) simplify the control loop implementation of a large number of pneumatic and electrical control circuit, which increases the complexity of the system, while the pilot solenoid valve in the formation and utilization of medium itself valve control loop, the structure is very simple. Number of technical parameters of the solenoid valve at home and abroad in the past restricted domestic solenoid valve diameter has been extended to 30Omm; medium temperature as low as 200 ° C, up to 450 ℃; Working pressure from vacuum to 25MPa. Action from ten seconds to a few milliseconds. These new developments in technology can completely replace the original bulky and expensive two control rapid shut-off valve and pneumatic switch valve, electric switch valve, and also partially replace the continuous adjustment of the pneumatic and electric control valve. (How can we better meet the regulation accuracy requirements, also referred to below). Foreign textile, light industry, construction and other industries have a large number of switch solenoid valve, metallurgy, chemical industry is the first solenoid valve in the auxiliary system to use more and more.

    Domestic self-control professional technical personnel has been increasing attention to the solenoid valve.

    (2) to simplify the piping system of automatic control valves in the pipeline must also be equipped with some auxiliary valves and fittings. Isolation bypass such as shown in Figure 1 is a typical method of installation shall be equipped with three manual valves, which the manual valve is a bypass valve, manual standby. 2 and 3 of the manual valve isolation valve to ensure that the online maintenance of the automatic control valve 5. Of course, had with two three links, and union. This piping system footprint and install time-consuming but also prone to leaks. ZDF series multi-function solenoid valve cleverly eliminates the need for these additional attachments are still isolated bypass function, which won the Geneva International Technical Gold. In front of the automatic control valves need to install the filters. A number of automatic control valve is used in combination they are often required to install one-way valve to prevent interference between the pipeline. Now, the way solenoid valve, solenoid valve combination solenoid valve and filtration have a role to play in simplify piping.

    (3) simplify the valve structure and process solenoid valve is the principle and structure of simple automatic control valves, but also further simplified. The appliance industry washing machines, refrigerators are equipped with solenoid valve, the structure and process of its parts are suitable for mass production. Ordinary solenoid valve coil parts in plastic package, reducing the pinout of the failure of the fracture, while easy to implement waterproof, explosion protection requirements. Body, bonnet and other parts have been using the technology of precision casting, forging, engineering plastic solenoid valve is also volume. Domestic explosion-proof solenoid valves has not flameproof, as well as Encapsulation, intrinsically safe. High pressure and high temperature solenoid valve to simplify the structure and process.

    2.2, the intelligent direction of development mainly refers to the solenoid valve and intelligent instrument better coordination to improve the control accuracy and reliability of the system. General-position adjustment difficult to achieve very high accuracy, however, but a lot of occasions, the appropriate way to achieve the required very high accuracy, significant savings in cost more solenoid valve technology

    (1) double combination solenoid valve. This is a different size of the solenoid valve together. Extensive use of tanker oil measurement accuracy of up to 0.02%, double solenoid valve. Large valve is open, making the fuel is nearing completion in a shorter period of time; large valve is closed by a small valve added to ensure flow accuracy. This technology has been applied abroad for many years, products manufactured by the world-famous solenoid valve professional company ASCOHoneywell The company produces double solenoid valve has reached the index of imported products, there is a unique performance. In passing that the more complex flow measurement of the domestic oil depot is also the introduction or counterfeit foreign structure, performance, less stable segment close the valve, this product is not a world famous professional company system, because the market demand did not reach enough to lead to their interest. Fact, oil tanks, domestic production of the large flow of the double combination valve, the effect would be much better. The combination of double valve used to control parameters such as temperature, pressure, level. Large valves ensure that the basis of the amount of small valve to provide the compensation amount. Relatively stable system parameters, this digitally controlled up to very high accuracy. Better parameter change larger systems, the rate of change remain subject to certain restrictions, such as temperature control system, is still thermal inertia effects. The combination of double valve used properly meet the control requirements of the premise of phasor control valve can significantly reduce costs.

    (2) three solenoid valves and digital valve three electromagnetic valve spool has three working position, usually electricity, in Enlight state, the valve to provide an initial flow; to an electrical signal, the solenoid valve fully open, providing flow; to other kinds of electrical signals, the valve off the valve.

    Valve with a manual device, when the long-term off valve without power consumption. Three solenoid valves can be regarded as a more compact double solenoid valve, it is easy to adjust the three, get a lot of applications. The ZDF multi-function solenoid valve further the idea of ??n size is proportional to the solenoid valve 2n kinds of traffic, similar to the digital circuit, said this combination valve for the digital valve. In fact, two different sizes of double valve or three valve can produce 24 = 16 32 = 9 kinds of traffic, and can reach very high accuracy. From the principle that, with the industrial computer matching has the advantage, but applications have not yet made a lot of demand, the technology is still at an experimental stage.

    (3) maintain solenoid valve self-maintain the solenoid valve is only energized momentarily to complete the valve switching action, without electricity to keep the spool position. The occasion of its advantages of energy saving battery power, and from time to consider the temperature rise, thus the coil long life, high level of security in situations of high and low temperature, explosion. Common mechanical maintain permanent magnet, but also points to the dual coil and single coil, single coil magnetic structure is the most simple. It is to change the polarity of the DC power to change the two states corresponding valve switch. This solenoid valve is installed separately coil external wiring required to add a switch, with intelligent instrument matching is very convenient. IC card pre-pay gas meter and water meters are equipped with solenoid valve is one of the keys to the success of the instrument 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 home smart watch factory to provide support.

    2.3, the general direction of the development of solenoid valves are used very widely, to use when the situation is different, enhance the general performance to reduce manufacturing, buying and selling, storage, installation, maintenance costs, and made great strides in this regard in recent years.

    (1) adjustable response time gives the signal to the completed spool action is called response time. Different occasions, switching speed, there are four combinations: fast open fast off for a rapid response system; fast opening, slow closing to prevent water hammer; slow to open fast off to slow Kai acute off; slow to open slow off- a smooth transition. ZDF multi-function solenoid valve side to make adjustment in any state, the application is very flexible.

    (2) Extension media applicable scope. The automatic control valve, solenoid valve and the other is the medium viscosity applies to a narrow range of air, water, steam, oil and media for the pilot solenoid valve and its structural parameters are different; generally are not common. ZDF multi-function solenoid valve only use a small screw, but do the gas, water, oil generic, but also the viscosity of the oil the scope of application greatly widened, popular.

    (3) The opening adjustable and, in dynamic and the kiln electromagnetic valve often also want to use it both manually, as a standby when the power outage or failure. More solenoid valve technical manual device only to manually open the valve or manually off valve, two fully equipped known as the full manual. Manual device can be preset for the valve opening, generally manually only the maximum or minimum valve opening preset complete manual can be preset maximum or minimum opening. ZDF-solenoid valve is a completely manual class. Other models solenoid valve may be needed, with a simple manual device.

    2.4, the development on the special direction of solenoid valve sales in recent years has exceeded the control valve is mainly dedicated solenoid valve of the demand surge. To be introduced were the following media categories:

    (1) due to the structural adjustment of China\\ s fuel, the gas solenoid valve, the proportion of gas fuels rise, 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 China were already mature product. This CE series gas solenoid valve has been exported to the European Union. It is worth mentioning that the dual-fuel vehicles with the sound of the environmental regulations in China 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. Fact, these solenoid valve is not foreign solenoid valve professional company production and performance test results are not all in compliance with the relevant technical standards of China\\ s gas industry. The company already has a more reliable and more affordable dedicated solenoid valve is gradually replacing imported electromagnetic valve.

    (2) the steamed range of 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.

    This company ZQDF-3 solenoid valve, 92 years as a national new product, the well-user tests in recent years has launched a compact CC series of steam solenoid valve.

    (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, our 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. Such waterworks solenoid valve in the hundreds of waterworks. Water Association (IWA) as the only recommended by the solenoid valve. 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 the impact of foreign traditional, complex structure, the torque is difficult to control the electric valve the country is still a lot of selection. 1997 Chairman Mao Memorial Hall maintenance projects to save the remains of such high-precision air-conditioning system has selected the company\\ s air conditioning solenoid valve to obtain satisfactory results. CPC Central Committee and Memorial Authority also recently personally Certificates sent to the Company, in fact, the recognition should be the courage and wisdom of the engineering staff.

And solenoid valve technology development related to social progress of the scientific papers of the past can only be simple to talk about technology, involving social management easy for a laughing stock.

    Today, scientific and technological development depends and to promote social progress and come to a consensus. I engaged in scientific and technological inventions and management, and talk a bit about that is necessary. Solenoid valve solenoid valve is directly related to the production with the enterprise security industry products in China because of the solenoid valve of inferior quality, the occurrence of a boiler explosion, fire failure and other serious accidents. The former Ministry of Machinery already solenoid valve as a certification of the licensed production and sale of products. Domestic holder of an enterprise to ten. Compared to large companies and foreign professional, technical and economic strength are significant gaps. After the reform and opening up, the rise of private technology enterprises, has the United States, Japan, Europe approved by the patent, the product has gradually entered the markets of developed countries, the economic strength of SMEs is increasing more than their foreign counterparts. But up to dozens of unlicensed production enterprises, fake and shoddy depriving many designers mistakenly believe that the quality of the solenoid valve does not pass. The progress of the industry in recent years as a welcome change.

    (1) xenophilia mentality is still serious national self-confidence.

    The introduction of complete sets of equipment in the 1980s into the solenoid valve, the 1990s, the well-known foreign companies have set up offices in China, imports of selected solenoid valve once the fashion of the automatic control engineering.

    The designer knows, price, delivery and after-sales service of imported products was at a disadvantage, but in the end vote for it. Some are of course necessary, but some common products to choose Taiwan, South Korea, Italy and some other small companies. Solenoid valve must differ from the space shuttle, after all, just a small product in this market on the Chinese people have the ability to dominant. Satellite launch base in recent years, the Daya Bay Nuclear Power Plant, Shanghai Baosteel maintenance solenoid valve has won the bid, reflecting our national self-confidence has been improving. With our products exported to Europe, the French Technology Quality Supervision and Evaluation Committee of the company and products as enterprises and products recommended to the EU. (2) unfair competition is extremely serious, the legal concepts are constantly joining.