First, the principle of direct-acting solenoid valve: Normally closed type direct-acting solenoid valve is energized, the electromagnetic coil generates electromagnetic attraction to lift the valve core, so that the valve core upper seal member leaves the valve seat, the valve is opened; when the power is off, the electromagnetic force Disappeared, the spring on the valve core seal on the valve seat, the valve closed. (Conversely, normally open type)
Features: It can work normally under vacuum, negative pressure and zero pressure difference. The bigger the valve diameter, the bigger the volume and power of the electromagnetic head. For example, the direct-acting solenoid valve produced by our company with the introduction of HERION technology can be used for 1.33×10-4 Mpa vacuum.
Second, step-by-step direct-acting solenoid valve (that is, recoil type)
Principle: Its principle is a combination of direct action and pilot. When energized, the solenoid valve opens the auxiliary valve first. The pressure in the lower chamber of the main valve is greater than the pressure in the upper chamber and the valve is opened by the simultaneous use of differential pressure and electromagnetic force; When power is applied, the auxiliary valve pushes the closing seal with spring force or medium pressure and moves downward to close the valve opening.
Features: It can work reliably even when there is zero pressure difference or about a certain pressure. The working pressure difference does not exceed 0.6 MPa. However, the power and volume of the electromagnetic head are relatively large and require vertical installation.
Third, the pilot solenoid valve principle: power, the electromagnetic force to drive the pilot valve to open the pilot valve, the main valve cavity pressure drops quickly, in the main valve upper and lower chamber to form a pressure difference, rely on medium pressure to promote the main valve closing parts move up, valve When the power is turned off, the spring force closes the pilot valve, and the inlet medium pressure quickly enters the upper cavity of the main valve through the orifice to form a pressure difference in the upper cavity, so that the main valve is closed.
Features: small size, low power, but the medium pressure range is limited, must meet the pressure conditions (0.01MPa).
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