Solenoid valve introduction, solenoid valve technical parameters, solenoid valve type submersible pump electric valve and solenoid valve difference

Solenoid valve introduction, solenoid valve technical parameters, solenoid valve type submersible pump electric valve and solenoid valve difference First, suitability The fluid in the line must be consistent with the media specified in the selected solenoid valve series. The fluid temperature must be less than the calibration temperature of the solenoid valve. Solenoid valve allows liquid viscosity in general below 20CST, greater than 20CST should be indicated. Working pressure difference, pipe maximum high pressure difference is less than 0.04MPa should be used such as ZS,2W,ZQDF,ZCM series and other direct acting and step by step type; The lowest working pressure difference is greater than 0.04MPa, pilot type (differential pressure type) solenoid valve can be selected; The maximum working pressure difference should be less than the maximum calibration pressure of the solenoid valve; General solenoid valves are one-way work, so pay attention to whether there is a reverse pressure difference, such as the installation of check valves. When the fluid cleanliness is not high, the filter should be installed before the solenoid valve, and the liquid gas solenoid valve requires a better cleanliness of the medium. Pay attention to the flow aperture and nozzle diameter; Solenoid valve generally only switch two control; Please install bypass pipe for easy maintenance. When there is water hammer phenomenon, the opening and closing time of the solenoid valve should be customized. Pay attention to the influence of ambient temperature on the solenoid valve: the power supply current and power consumption should be selected according to the output capacity, the power supply voltage generally agreed to about 10%, must pay attention to the high VA value when AC starting. Ii. Reliability Solenoid valve is divided into normally closed and normally open two kinds; Generally choose normally closed type, power open, power closed; But in the opening time is very long closed very short to choose the normally open type. Life test, factory generally belongs to type test projects, it is said that there is no professional scale of solenoid valve in our country, so it is more careful to choose solenoid valve manufacturers. When the action time is very short and the frequency is high, the direct action type is generally selected, and the fast series is selected for large caliber. Iii. Safety General solenoid valve is not waterproof, in the premise does not agree, please choose waterproof type, the factory can be customized. The maximum calibration nominal pressure of the solenoid valve must exceed the maximum pressure in the pipeline, otherwise the service life will be shortened or other accidents. Corrosive liquid should be selected all stainless steel type, strong corrosive fluid should be selected plastic king (SLF) solenoid valve. The corresponding explosion-proof products must be selected for the sexual environment. Iv. Economy There are many solenoid valves can be universal, but on the basis of the above three points should be satisfied with the most economic products. The structure principle of solenoid valve First, direct acting solenoid valve There are normally closed type and normally open type. Normally closed power is closed, when the coil is energized, the electromagnetic force is generated, so that the moving core to overcome the spring force with the static core suction directly open the valve, the medium is a path; When the coil power disappears the electromagnetic force, the moving core is reset under the action of the spring force, and the valve port is directly closed, and the medium is blocked. Simple structure, reliable operation, normal work under zero pressure difference and micro vacuum. Normally open type is the opposite. Such as less than 6 flow diameter solenoid valve. Two, step by step direct acting solenoid valve The valve adopts primary opening valve and secondary opening valve connected in one, the main valve and pilot valve step by step to make the electromagnetic force and pressure difference directly open the main valve port. When the coil is energized, the electromagnetic force makes the moving iron core and the static iron core pull, the pilot valve opening and the pilot valve port is located on the main valve port, and the moving iron core and the main valve core are connected together, at this time the pressure on the main valve chamber through the pilot valve port unloading, the pressure difference and the electromagnetic force at the same time under the action of the main valve spool upward movement, open the main valve medium smooth. When the electromagnetic force disappears when the coil is powered off, the moving iron core closes the pilot valve hole under the action of self-weight and spring force. At this time, the medium enters the upper chamber of the main spool in the balance hole, so that the pressure of the upper chamber rises. At this time, the main valve is closed under the action of spring return and pressure, and the media is cut off. Reasonable structure, reliable action, and reliable work at zero pressure difference. Such as: ZQDF, ZS, 2W, etc. Three, indirect pilot type solenoid valve The series of solenoid valve by the pilot valve and the main spool form a channel combination; Normally closed type in no power, is closed state. When the coil is energized, the magnetic force generated makes the moving core and the static core pull together, the pilot valve port opens, and the medium flows to the outlet. At this time, the pressure in the upper chamber of the main spool is reduced, lower than the pressure on the entrance side, forming a pressure difference to overcome the spring resistance and then move upward to achieve the purpose of opening the main valve port, and the medium is smooth and smooth. When the coil power, the magnetic force disappears, the moving iron core under the action of the spring force reset closed pilot port, at this time, the medium from the balance hole into the main spool chamber pressure increases, and under the action of the spring force downward movement, closed the main valve port. The normally open principle is the opposite. Such as: SLA, DF(over 15 caliber), ZCZ, etc. Submersible pump electric valve and solenoid valve difference The solenoid valve is the electromagnetic coil energized after magnetic attraction to overcome the pressure of the spring to drive the spool action, a solenoid coil, simple structure, cheap price, can only realize the switch; The solenoid valve is the electromagnetic coil energized after magnetic attraction to overcome the pressure of the spring to drive the spool action, a solenoid coil, simple structure, cheap price, can only realize the switch; Electric valve is driven by electric motor stem, drive spool action, electric valve is divided into (off valve) and regulating valve. Turn-off valve is a two-position work that is fully open and fully closed, regulating valve is installed on the electric valve positioner, through closed-loop regulation to make the valve dynamic not disorderly in a position. Electric valve is driven by electric motor stem, drive spool action, electric valve is divided into (off valve) and regulating valve. Turn-off valve is a two-position work that is fully open and fully closed, regulating valve is installed on the electric valve positioner, through closed-loop regulation to make the valve dynamic not disorderly in a position. Electric valve and solenoid valve uses: solenoid valve: for liquid and gas pipeline switch control, is two DO control. Generally used for small pipe control. Electric valve: For liquid, gas and wind system pipeline medium flow analog volume regulation, AI control. In the control of large valves and wind systems can also use electric valves to do two switch control. Solenoid valve: can only be used as a switching quantity, is DO control, can only be used for small pipe control, common in DN50 and below the pipe, up very little. Electric valve: can have AI feedback signal, can be controlled by DO or AO, compared to large pipes and air valves. Switch form: Solenoid valve is driven by coil, can only be opened or closed, switch action time is short. The drive of electric valve is generally used for motor, open or close action to complete a certain amount of time simulation, can be adjusted. Nature of work: Solenoid valve is generally smooth coefficient is very small, and the working pressure difference is very small. Like the general 25 caliber solenoid valve smooth coefficient is much smaller than 15 caliber electric ball valve. The solenoid valve is driven by the solenoid valve coil, more easily damaged by voltage impact. Commensurate with the role of the switch, that is, on and off 2 roles. The electric valve is generally driven by a motor, more resistant to voltage impact. Solenoid valve is fast opening and fast closing, generally used in small flow and small pressure, switching frequency is required to large place electric valve vice versa. The opening of the electric valve can be controlled, the state is open, closed, half open and half closed, you can control the flow of the pipeline medium and the solenoid valve can not meet this requirement. Solenoid valve general power can be reset, electric valve to such a function needs to add a reset device. Common process: Solenoid valve is suitable for some special process requirements, such as leakage, fluid medium, etc., the price is more expensive. Electric valves are generally used for regulation, but also switch quantity, such as: fan coil end. The above is a small series for you to explain about the pump and valve related knowledge, some need to understand, but some need to bear in mind, otherwise meet the relevant emergency is you should be blind! In short, there is no mistake in knowing more knowledge. I hope the above knowledge of Xiaobian will help you.