What Different Styles of 2-Way 2-Position Solenoid Valves Are There?

A 2-way 2-position solenoid valve is a step-by-step direct-driven solenoid valve, and according to its closing state it can be divided into a normally closed type and a normally open type.

In a normally closed solenoid valve, the coil is driven by electromagnetic force, and under the action of the electromagnetic force the armature first lets the liquid in the sub-valve cover flow out of the sub-valve, thereby reducing the pressure on the main valve seat; it belongs to the high-pressure 2-way 2-position solenoid valve and is extremely strong in this respect.

When the coil is cut off, the electromagnetic force is eliminated, and the armature drops due to its own weight. At the same time, through the pressure of the medium, the main and sub-valves are tightly closed.

In a normally open solenoid valve, after the coil is energized, the moving iron core moves downward due to the suction, causing the sub-valve plug to move down, the sub-valve to close, and the pressure of the main valve cup to rise. When the pressure reaches a certain value, the pressure difference above and below the main valve cup becomes the same, and under the action of the electromagnetic force, the moving iron core presses down on the main valve cup, pressing the main valve seat tightly and closing the valve.

The mechanism of a cartridge-type 2-way 2-position solenoid valve is that when the coil is de-energized, the electromagnetic suction is 0. The sub-valve plug and moving iron core are lifted up by the action of the spring, the sub-valve opens, and the liquid in the main valve cup flows out through the sub-valve, thereby reducing the pressure on the main valve cup. When the pressure on the main valve seat drops to a certain value, the main valve cup is pushed up by the differential pressure, opening the solenoid valve and allowing the medium to flow.

Even in an environment with a pressure difference of 0, or in a vacuum and high-voltage environment, it can work, but because its energy is very large, it must be installed laterally.

Working principle of a guided solenoid valve: at start-up, a pneumatic 2-way 2-position solenoid valve opens the air guide port, so that the pressure in the upper cavity drops rapidly, forming a high pressure difference above and below around the closing element, and the closing element is lifted by hydraulic pressure, thereby opening the valve; when power is cut off, the air guide port is closed by elastic force, and the intake pressure quickly passes through the bypass hole, forming a pressure difference of upper-lower and lower-upper, pushing the closing element downward by hydraulic pressure, thus closing the valve.

Features: the oil pressure control range of this product is relatively large and can be set arbitrarily according to user requirements, but the hydraulic pressure difference must be achieved. Special attention should be paid to the medium properties, ambient temperature, working frequency, power supply, and so on.