When the DC solenoid valve is used, the suction slowness often occurs, which seriously affects the normal operation. The main reason for the slow suction is that when the power is turned on, the self-inductance of the solenoid valve coil limits the rate of rise of the current, which causes the suction to be slow. Solution: Use high voltage and strong excitation (see illustration) to solve. Thus, the solenoid valve control switch SA is closed, and the time relay KM coil is electrically connected. At this point, the solenoid valve is extended at KM_2
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