Introduction to the Development of Solenoid Valves

(1) Simplify the control loop

In the past, a large number of pneumatic and electric control circuits were used in the actuators, which increased the complexity of the system, while the pilot solenoid valve formed a control circuit using the working medium itself in the valve, and the structure was very simple. In the past, many technical parameters of solenoid valves at home and abroad were still limited. Now the diameter of domestic solenoid valves has been expanded to 300mm; the temperature of the medium is as low as -200 ℃ and as high as 450 ℃; the working pressure is from vacuum to 25MPa. The action time ranges from a dozen seconds to a few milliseconds. The new development of these technologies can completely replace the original bulky and expensive two-position control quick shut-off valve and pneumatic switch valve, electric switch valve, and can also partially replace the continuously adjusted pneumatic and electric control valve. Foreign textile, light industry, urban construction and other industries have switched to solenoid valves in large numbers, while metallurgy, chemical and other industries have taken the lead in using more and more solenoid valves in auxiliary systems. Domestic automatic control professionals have paid more and more attention to solenoid valves.

(2) Simplify the piping system

A filter needs to be installed in front of the automatic control valve. When multiple automatic control valves are used in combination, it is often necessary to install check valves to prevent interference between pipes. Now, one-way solenoids, combination solenoids, and filtered solenoids have all played a role in simplifying piping.

(3) Simplify the structure and process of the wide door

The solenoid valve belongs to the automatic control valve with simple principle and structure, but it needs to be further simplified.

The structure and process of the solenoid valves for washing machines and refrigerators in the home appliance industry are suitable for mass production. The common solenoid valve coil components have been encapsulated in plastic to reduce the failure of the lead wire breakage, and at the same time, it is easy to achieve waterproof, explosion-proof and other protection requirements. The valve body, bonnet and other components have adopted precision casting, forging and other processes, and engineering plastic solenoid valves have also been launched in batches. Domestic explosion-proof solenoid valves are not only flameproof, but also potting and intrinsically safe. High-pressure and high-temperature solenoid valves have also appeared to simplify the structure and process.

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