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There are many kinds of small solenoid valves. Different solenoid valves function at different positions in the control system. The most commonly used one-way valve, safety valve, direction control valve, speed control valve, small solenoid valve and so on.

Working principle of electromagnetic valve solenoid valve inside a sealed cavity, in a different location to open a hole, each hole is connected different tubing, one of cavity piston, flanked by two electromagnet, when electromagnetic coil current, the body will be attracted to which side, by controlling the movement of the body to open or close the different discharge of oil hole, and the oil hole is always open, The hydraulic oil goes into the different drains, and the piston of the cylinder is driven by the oil pressure, which in turn drives the piston rod, which in turn drives the mechanism. Therefore, the mechanical movement is controlled by controlling the current in the electromagnet.

Working principle of direct moving solenoid valve: when energized, electromagnetic coil produces electromagnetic force, so that the closed parts leave the seat, open the valve; When the power is off, the electromagnetic force disappears, the spring presses the closing part, and the valve closes.

Operation features: vacuum, negative pressure, zero pressure can work normally, the diameter is generally not more than 25mm.