Principle And Functions Of Magnetic Valve
Rely on electromagnetic force to direct or indirect drive valve called electromagnetic valve. Electromagnetic valve can be divided according to the different structure
First : direct-acting solenoid valves
There are two kind: closed type and often open type. When Closed type outage, winding is closed, when electricity generated when the electromagnetic winding, moving iron core overcome spring force and pull in with static core and open valve, medium is a direct access , When electromagnetic winding outage,magnetic force disappear, moving iron core reset under the action of forces in the spring, direct shutoff valves and interfaces. Qualitative Simple structure, reliable operation, the zero pressure differential and micro vacuum. Contrary to often open type. If less than φ 6 flow sizes of solenoid valves.
Second, step-by-step direct acting solenoid valves
This valve USES first open valve and twice open valve in a whole, the main valve in step with pilot valve to make electromagnetic force and differential pressure open the main valve.Directly, When the coil electrify, produce electromagnetic force to make static iron core pull in the moving iron core, pilot valve mouth open and pilot valve is in the mouth of the main valve, the main valve core and the moving iron core are connected together, the main valve pressure in the cavity through the pilot valve unloading in the mouth, under the effect of differential pressure and electromagnetic force, the main valve core to make the upper movement, the main valve opens the circulation medium. When the coil outage, electromagnetic power disappear. when moving iron core under the action of self-weight and spring force, pilot valve closed. medium go into the main valve upper cavity in the balance hole, the cavity pressure rises in the spring, and under the action of spring reset and pressure,the main valve closed, medium flow cutout. Reasonable structure, reliable operation, the zero differential pressure at work and reliable. Such as: ZQDF, etc., 2W ZS
Third, indirect pilot solenoid valves
This series of solenoid valve is constituted by the passage combined of pilot valve and main valve core,normal close type is off when it is outage, when the coil is on,the magnetic force make moving iron core and static iron core pull-in, medium rush out after the pilot valve port opens. When the coil is outage, magnetic force disappear, moving iron core reset and close pilot port under the spring force, medium flows from the balance, the spring pressure of the main valve epicoele increases, and downward movement under the action of spring force and shut off main valve port. The principle of Normal open-type is just the reverse.