Solenoid valve and the structure of knowledge of the Selection Principle (b)

Third, security



Solenoid valve generally not waterproof, when the conditions do not allow selection of waterproof type, the factory can be customized.



The highest calibration solenoid valve Nominal pressure must exceed the maximum pressure within the pipeline, otherwise life will be shortened, or have other unforeseen circumstances.



Corrosive liquids should use the whole stainless steel type, strong corrosive fluid should be selected plastic Wang (SLF) solenoid valve.



Explosive environment must choose the appropriate explosion-proof products.



Fourth, economic



There are many general-purpose solenoid valve can be, but can satisfy the above three points should be chosen based on the most economical products.

ball valve



The structure of the principle of the solenoid valve



A: Direct acting solenoid valve



There are normally closed and normally open type two kinds. Type normally closed when power was turned off, when the coil electromagnetic force generated when power to overcome the spring force moving core static core with a direct pull-open valve, media access was; When the coil power disappear when the electromagnetic force, moving iron core in the spring under the force reduction, direct closure of valve port, media access. Simple structure, reliable action, in the zero-pressure and micro-vacuum work. Always the opposite type. If the path is less than the φ6 flow solenoid valve.



Second, step-by-step direct acting solenoid valve



Open the valve using a valve and secondary valve to open even in the one, the main valve and the step-by-step guide so that the electromagnetic valve and differential pressure to open the main valve port directly. When the coil power, the generated electromagnetic force so that core dynamic and static pull-core, I open the valve guide and valve guide I set up on the main valve port, and moving the main spool core together, when the main valve on the Introduction of the pressure chamber through the unloading valve port in the pressure difference and the electromagnetic force at the same time under the spool so that the main upward movement, the main valve to open the flow of media. When the coil power disappear when the electromagnetic force, when the moving core in the self-determination and the role of the spring force to close the valve guide hole, when the media balance the hole in the spool on the main chamber, so that increased pressure on the cavity at this time reduction in the spring and the pressure to close the main valve, drying medium. Reasonable structure, reliable action, zero pressure and reliable when the work. Such as: ZQDF, ZS, 2W, etc..



Third, pilot-type solenoid valve indirectly



This series solenoid valve by the pilot spool valve and main contact channel with the formation of a combination; type normally closed when no power, was switched off. When the coil power, the generated magnetic core so that dynamic and static pull-core, I open the valve guide, the flow of exports of medium, when the main spool to reduce pressure on the cavity, which is lower than the pressure of the import side, the formation of pressure to overcome the spring resistance and the subsequent upward movement, reaching the main valve to open the mouth of the purpose of the flow medium. When the coil power, the magnetic force disappears, the spring force in the core activities under the pilot shut down the mouth reset, when the medium flows from the balance of holes, the main chamber pressure on the spool, and the role of the spring force of the downward movement, Close the main valve port. The principle of open-type is just the opposite. Such as: SLA, DF (φ15 caliber above), ZCZ, etc..

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