2.1, the direction of streamlining the development will be to fine to Jane, only to have long been simple. This is also the scientists and engineers to pursue permanent.
(1) simplify the control circuit a large number of previous use of pneumatic actuators and electrical control circuit, which increases the complexity of the system, and pilot-type solenoid valve in the valve to make use of the media to form its own control loop, the structure is simple . At home and abroad over the past number of technical parameters of the solenoid valve is also restricted, and now domestic Path Solenoid Valve has been extended to 30Omm; medium low temperature - 200 ℃, up to 450 ℃; the working pressure from vacuum to 25MPa.十几秒to action from a few milliseconds. New developments in these technologies has completely replaced the original size can be costly to cut off the two control valves and pneumatic fast switching valve, electric valve, but also for partial replacement of the air-conditioning, electric control valve. Abroad, textile, light industry, construction and other industries has been a significant switch to the solenoid valve, and metallurgy, chemical industry took the lead in the support system is used in an increasing number of solenoid valves. National professional and technical personnel have been controlled more and more attention to the solenoid valve.
(2) pipeline system to simplify the work of automatic control valve in the pipe on the road must be equipped with a number of auxiliary valves and pipe fittings. For example, isolation shown in Figure 1 is a typical installation of bypass method, required to wear the three manual valves, of which 1 is the bypass valve manual valve, manual back-up. The manual valve 2 and 3 is the isolation valve, automatic control valve to ensure maintenance 5 online. Of course, have links with two joints 4 and 6 live. Pipeline system that share a large space, and time-consuming to install, but also easy to leak. ZDF series of multi-function solenoid valve cleverly omitted the additional annex still bypass the function of isolation, which won the Geneva International Gold new technologies. Automatic control valve in front of the need to install filters. Joint use of a number of self-control valve also often need to install one-way valves to prevent interference between channels. Now, one-way solenoid valve, solenoid valve and the combination of the solenoid valve with filter to simplify pipeline in the area have played a role.
(3) to simplify the structure and process valve solenoid valve is a simple principle and structure of the automatic control valve, but also to further simplify. Household appliances washing machines, refrigerators with the electromagnetic valve, the structure of its components and processes are suitable for mass production. Solenoid valve coil ordinary plastic packaging components has been to reduce the pinout of the fault rupture at the same time easy to achieve the water-proof, explosion-proof requirements, such as protection. Valve body, valve cover and other parts have been using precision casting, forging, such as technology, engineering plastics bulk solenoid valve has also been listed. Domestic explosion-proof solenoid valves has not only explosion-proof, as well as letters poured type, the security type. High-pressure and high temperature of the solenoid valve also simplified the structure and processes.
2.2, the development of intelligent direction this mainly refers to how the solenoid valve to achieve a better coordination with the smart meters to improve the control accuracy and reliability. Regulation is generally believed that digital is very difficult to achieve high precision, however, used in many occasions it can be appropriate manner to achieve the required very high accuracy, and significantly more cost-saving solenoid valve technology
(1) double-solenoid valve combination. This is a solenoid valve of different sizes together. A large number of tanker aircraft used precision measurement of oil as high as 0.02%, using double-solenoid valve. Large valve opening, the filling in a short period of time is near completion; and then close the large valve, small valve added to ensure the accuracy of the flow. This technology has been applied abroad for many years, products from the world's leading solenoid valves and other professional firms ASCOHoneywell company. Now the company produces double-solenoid valve has reached the target of imported products, there is a unique performance. The way that the large flow of domestic oil tank measurement or imitation is still the introduction of more complex structures abroad, performance and stability due to the closure of multi-stage valve, this product is not the world's leading professional company, because the market did not demand enough to be cited with their interest. In fact, we used oil tanks, domestic production of double-flow valve combination, the effect will be much better. Double-combination valve is also commonly used to control the temperature, pressure, liquid level and other parameters. Valve to ensure that the basis of the volume of large and small valve to provide compensation. Relative stability in the parameters of the system, this digital control can achieve very high precision. Larger number of parameters of the system changes, the rate of change is still certain constraints, such as temperature control system, still the impact of heat inertia. Therefore, the use of appropriate combinations of double-valve control in meeting the requirements of Phase significantly for the control valve to reduce costs.
(2) the three solenoid valves and digital valve spool solenoid valve 3 has three jobs, are normally not power, at Enlight, and to provide initial flow valve; to an electrical signal, wide-open solenoid valve to provide large flow; to other types of signals, the valve clearance valve.
Valve with a manual device also makes long-term clearance was also no power valve. Three solenoid valve can be regarded as a more compact structure of the double-solenoid valve, it is convenient to adjust the three has been a lot of applications. Multi-function solenoid valve ZDF further n the idea is a certain percentage of large and small into the composition of the solenoid valve flow 2n species, similar to digital circuit, said combination valve for the digital valve. In fact two different sizes of double-valve or valves can have three 24 = 16 or 32 = 9 kinds of traffic, has been able to reach very high accuracy. From the principle that it has the advantage of supporting industrial control computer, but the applications have not yet made a lot of demand, the technology is still in the testing stage.
(3) maintain a self-holding type solenoid valve solenoid valve type is the only moment to complete the power valve moves spool to maintain the position without power. Its advantage lies in energy conservation, especially with the battery for power supply, and may from time to consider the temperature rise, thus the coil long life, high temperature, explosion-proof and so on have a higher security. Common mechanical to maintain and keep the permanent magnet and double-coil and single coil, single coil magnetic structure of the most simple to maintain. It is to change the polarity of DC power to change the valve corresponding to the two states. This solenoid valve coil separate external wiring required to install additional change-over switch, and with the smart meter is very convenient package. Pre-IC card gas meter and water meter charges with the electromagnetic valve is one of the keys to the success or failure of instrumentation, including the self-sustaining solenoid valve technology is also an important factor in the success or failure, the electromagnetic self-sustaining domestic has become increasingly mature, the company has for more than smart table works to provide family support.
2.3, the direction of general-purpose solenoid valve on the development of a wide range of applications, and the situation is different when used to enhance general performance manufacturing, purchase and sale, storage, installation, maintenance costs, in recent years made great strides in this area.
(1) response time, given electrical signal to the adjustable spool time to complete action as the response time. Want to switch on different occasions at different speeds, there are four combinations: fast open fast ---- for the rapid response system; soon ---- open slow clearance for the prevention of water hammer; --- slowly opened for fast relief Kai radical break; slow slow clearance opening 11 for a smooth transition. ZDF side multi-purpose solenoid valve can be adjusted so that in any one state, the application is very flexible.
(2) to expand the application of norm-solid medium. Solenoid-controlled valves and other media of different viscosity is to narrow the scope of application, so air, water, steam, oil and other media-type solenoid valve for the pilot of its structural parameters are different; generally is not common. The multi-function solenoid valve ZDF only a small screw, but do the gas, water, oil, General Motors, but also the viscosity of the oil greatly widened the scope of application, is most welcome.
(3) opening and adjustable and fixed to the solenoid valve in the use of kiln often also hope that it features both manual as a back-up power or failure. Solenoid valve technology more devices in general can only be manually opened manually or manual valve clearance valve, said two completely manually complete. Manual installation of the valve opening can be preset, generally manually only the maximum or minimum valve opening to preset, while the full manual to the maximum or minimum respectively for pre-opening. ?? It is necessary with a simple manual devices in general.
2.4, the direction of a dedicated development in recent years, sales of solenoid valves for more than a regulating valve, the main solenoid valve is a variety of specialized demand surge. Medium, respectively, according to the following categories to be introduced:
(1) gas solenoid valve as a result of the restructuring of China's fuel, the proportion of gas rising, the demand for gas solenoid valve is also growing. There are natural gas, industrial gas, city gas, liquefied petroleum gas, such as a good variety of impurities and corrosion contains different requirements for different valves. Moreover, the pressure levels vary greatly, compressed natural gas as high as 21 ~ 25Mpa, and gas pressure as low as a 2Kpa. China is already a mature product, respectively. The company's CE series gas solenoid valve has been the EU exports. It is worth mentioning that dual-fuel vehicles with the environmental regulations in China and continuing efforts to promote the sound, 12 cities have converted tens of thousands of vehicles is now more complete selection of imported fuel for the device, which is also with the solenoid valve matching imports. In fact, the solenoid valve solenoid valve is not a professional foreign company, the performance of the test results are not all in line with China's gas industry technical standards. The Company has been more reliable and more cost-dedicated solenoid valve, is gradually being replaced by imports of solenoid valve.
(2) Fan steam solenoid valve solenoid valve steam temperature is first necessary to resolve the problem, the sealing material, conductive and magnetic materials should be selected. Comparison of steam pipeline corrosion powerful to be taken seriously. More importantly, after work in the factory, there are a lot of steam pipe condensation water, the need for solenoid valves and liquid gas can be reliable when the fluid moves through, the factory inspection procedures more strict. The company's ZQDF-3-type solenoid valve, 92, was listed as national new products, well-user tests, in recent years has introduced a compact series steam solenoid valve CC.
(3) water solenoid valve water solenoid valve with the total is considered the most simple, but in reality divided into tap water, industrial water, industrial wastewater, irrigation water, seawater and many other categories, the corrosion, the cleanliness of the different , should be a different selection of solenoid valves.
Although the most common water valve, but the use of different performance requirements of the valve is not the same. For example, the fire electromagnetic valve, the reliability of vital action, if the failure lead to disastrous consequences. Even if long-term general manual gate valves, it is difficult to quickly open. High-rise buildings springing up in recent years, China's fire solenoid valve technology also mature. In another example, the water plant needs to be inverted solenoid valve for pipe, the solenoid valve to the pressure of the state but also in the vacuum of reliable work, there must be no leakage, but also in the cleanliness of the water situation is not high under the action should be flexible. The waterworks company dedicated solenoid valve that has hundreds of water plants in the country are applied. Water by the Chinese Association for the only recommended as a solenoid valve. In addition sprinkler solenoid valve is also China's agriculture and landscape with the development of the industry gradually be applied.
(4) oil oil solenoid valve with a wide range of sealing technology is one of the keys. Type of rubber is the name of oil, different kinds of oil or oil with impurities contained in the election to be different on different rubber oil. For example, the ability to leaded gasoline to unleaded petrol may not be resistant. In recent years, a dedicated solenoid valve with an increase in sales, private life of oil and rubber is also rising. Different oil viscosity be selected solenoid valve of different structures. High-viscosity oil is also often in a state of high temperature flow, the solenoid valve is also followed to solve the problem of high temperature. For the fuel needed to meet the explosion-proof requirements. In recent years, the company rolled out gasoline, diesel, fuel oil and other special solenoid valve, has been widely applied.
(5) Air conditioning with air-conditioning sub-solenoid valve heating and cooling. Refrigerant changed significantly in recent years, to gradually reduce ammonia and Freon, and other new types of lithium bromide refrigerant gradually increased, the corresponding sealing, corrosion, life and other issues require careful selection and rational design and advanced technology. It is worth mentioning that mainly rely on air conditioning air flow to control temperature and humidity, valves for regulating flow is not absolutely necessary. Valve there is no air-conditioning system is also used, but problems arise, such as drip Gel by condemnation. And therefore the structure is simple, inexpensive solenoid valve is the choice to live. Abroad due to the impact of traditional, complex, difficult to control the torque of the electric valve is still a large number of domestic selection. Chairman Mao Memorial Hall 97 years of maintenance works to preserve the remains of such a selection of high-precision air-conditioning system's air-conditioning of the solenoid valve to obtain satisfactory results. Authority of the CPC Central Committee General Office of the Memorial Hall recently to honor the certificate in person to the Company, in fact, the recognition of more engineers should be the courage and wisdom.
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