• Structural principle of the solenoid valve

    Date: 2012-5-11 9:26:50
    Direct acting solenoid valve normally closed and normally open two kinds of normally closed when power was turned off, the electromagnetic force generated when the coil is energized, the moving core to overcome the spring force with a static core pull directly open the valve, the medium was the pathway; electromagnetic force disappears when the coil power, moving core reset spring force, and what role close SMC solenoid valve, the valve port, dielectric barrier. simple structure, reliable action. zero pressure and micro vacuum to work properly. normally open just the opposite. such as less than the of 6 flow path solenoid valve.

    The step-by-step direct-acting solenoid valve valve with an open valve and secondary valve open even in one of the main valve and pilot valve, step by step so that the electromagnetic force and pressure directly open the main valve port when the coil is energized, produce electromagnetic force to pull the moving core and the static core, open the valve port and guide located on the main valve port pilot valve port, and the moving core and the main spool together, the main valve on the pressure chamber through the pilot valve port unloading, the pressure difference and the electromagnetic force, while under the main spool upward movement, open the main valve media circulation. electromagnetic force disappears when the coil power, the moving core weight and spring force to close the guide the valve hole, medium balance hole on the main spool cavity on cavity pressure rise in the spring return and pressure off the main valve, the media drying. reasonable structure, reliable operation, the zero differential pressure and reliable. In like: ZQDF, ZS, 2W (Figure 2 is a typical chart)

    Indirect Pilot solenoid valve solenoid valve by the pilot valve and main spool linked the formation of the channel combinations; normally closed when not powered, was closed when the coil is energized, the magnetic force generated moving core and static core pull open the pilot valve port, the media flow of exports, the main spool chamber pressure is reduced, lower than the import side, the pressure to form a differential pressure to overcome the spring resistance followed the upward movement, reaching to open the main valve port The purpose of the media flow. When the coil power, magnetic disappear, moving core reset spring force to close the pilot port, media from the balance of holes into the cavity pressure increases on the main spool and the spring force under the action of downward movement, close the main valve port.

    Normally open principle is just the opposite: SLA, the DF (15 above-caliber), of ZCZ such as the selection of the solenoid valve.

    1,the applicability of the pipeline fluid media and optional solenoid valve Series Model calibration fluid temperature must be less than the calibration temperature selection solenoid valve solenoid valve allows the liquid viscosity generally 20CST less than 20CST should be specified. working pressure, maximum pipeline pressure is less than 0.04MPa should use such as ZS, 2W, ZQDF, ZCM Series and other direct-acting and step-by-step direct action; minimum working pressure greater than 0.04MPa maximum working pressure should be less than the maximum calibrated pressure of the solenoid valve; General solenoid valve is a one-way, so pay attention to whether there is anti-pressure difference, if installed check valve can be selected pilot operated (differential pressure) solenoid valve; fluid cleanliness should be installed before the solenoid valve filter, general solenoid valve on the media Cleanliness better attention to the flow aperture and receiver caliber; solenoid valve generally only switch two control; conditions permit to install the bypass tube. ease of maintenance; water hammer phenomenon custom solenoid valve opening and closing time adjustment. pay attention to environmental temperature on the solenoid valve power supply current and power consumption should be selected based on output capacity, the supply voltage is generally allow plus or minus about 10 percent, must Note that the higher VA value of the start of the exchange.

    2,The reliability of the solenoid valve is divided into a normally closed and normally open two kinds; generally used in a normally closed type, power open, power off; open a very long time to shut down a very short time should I use normally open type of the life test, The plants are generally the type of pilot projects, rather that the country has not the professional standards of the solenoid valve, so careful selection of the solenoid valve manufacturers. a very short operating time higher frequencies generally select direct action, selection of large-caliber rapid series.

    3,Security general solenoid valve is not waterproof, when conditions do not permit to use water type, the factory can be customized. The highest calibration nominal pressure of the solenoid valve must be more than the maximum pressure within the pipe, otherwise life will be shortened or produce other unforeseen circumstances. corrosive liquids should be used in all stainless steel type, strong corrosive fluids should use plastic Wang (SLF) electromagnetic valve. explosive environment must use the appropriate explosion-proof products.

    4,The economy has a lot of the solenoid valve can be generic, but should be used to meet the above three points on the basis of the most economical product.

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