How to Classify the Solenoid Valve?

The solenoid valve is used to control the direction of the fluid, belongs to the actuator; usually used for mechanical control and industrial valves, to control the medium direction, so as to achieve the control of the valve switch. Working principle is its internal closed cavity, open a hole in different positions, each hole leads to different tubing, the cavity in the middle of the valve, two sides are two electromagnet, which magnet coil electric valve body will be attracted to which side, by controlling the movement of the valve body to live or leak different oil hole, and oil hole is often open, hydraulic oil will enter different pipes, and then through the oil pressure to push the oil cylinder piston, piston and piston rod, piston rod drive mechanical device. This controls the mechanical movement by controlling the electric current of the electromagnet.

There are also some difficulties in the production, and the structural design is very important, because the structural design directly determines its reliability and service life. Therefore, the structure needs to be designed and optimized for many times to ensure that it has good performance and can work stably. The selection of materials requires strict selection of various materials with good electrical and mechanical properties, which puts forward high requirements for the selection of materials. Because the material must not only meet the strength, hardness and other requirements, but also must have a certain conductivity, high temperature, wear resistance and other characteristics, and the physical properties required by these characteristics are often very harsh, so the choice of material is very difficult. The production accuracy puts forward high requirements for the production process and manufacturing process. Therefore, in the production, it is necessary to carry out multiple precision tests, and to adjust and improve the manufacturing process. Production process is an important factor affecting the quality and performance, but also one of the difficulties in production. Therefore, in order to produce high quality, high performance solenoid valve, we must improve and upgrade in the manufacturing process.

The principle is divided into three categories: the first type is direct solenoid valve, the principle is electrified, the solenoid coil produces electromagnetic force to lift the closing part from the valve seat, the valve opens; when the power cuts, the electromagnetic force disappears, the spring presses the closing part on the valve seat, and the valve closes. It can work normally in vacuum, negative pressure and zero pressure, but the diameter is generally not more than 25mm. The second type is the distribution of direct motion solenoid valve, is a principle of direct motion and pilot combination, when there is no pressure difference between the entrance and outlet, power, the electromagnetic force directly to the pilot small valve and the main valve close in turn to lift, the valve opened. When the inlet and outlet reach the starting pressure difference, the electromagnetic force pilot valve, the pressure of the main valve lower chamber rises and the pressure of the upper chamber drops, thereby using the differential pressure. When the power is off, the pilot valve uses the spring force or medium pressure to move down and close the valve. In the zero pressure difference or vacuum, high pressure can also be * action, but the power is larger, must be installed horizontally. The third type is the pilot solenoid valve, when electrified, the electromagnetic force opens the pilot hole, and the pressure of the upper chamber drops rapidly, around the closing pressure difference, the fluid pressure pushes the closing part up, the valve open; when the power is off, the spring force closes the pilot hole, the inlet pressure through the bypass hole, close the valve. The upper pressure range of fluid is high and can be installed (for customization) but the fluid pressure difference must be met.

From the valve structure and material of the difference and principle of the difference, divided into six branch subcategories, respectively, direct moving diaphragm structure, step heavy sheet structure, pilot membrane structure, direct piston structure, step straight piston structure, pilot piston structure.

Solenoid valve is widely used in the field of industrial automation, mainly including pressure control, temperature control, flow control, water level control and so on. For example, cylinder control, fans, pumps, etc. on the automated production line are it to control. Fast response and precise control capabilities can improve the efficiency and quality of production lines, save energy and material costs, and optimize the production process. Secondly, it is also widely used in the civilian field. For example, household washing machines, air conditioners and other home appliances need its control to complete the water flow, refrigeration and other functions. Application in the civilian field makes our life more convenient, comfortable and safe. In addition, in agriculture, medical care, environmental protection and other fields also has a wide range of applications. For example, the sprinkler irrigation system, liquid medicine delivery, waste gas treatment and so on are needed.

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