The differences between the middle-sealed, middle-vented, and medium-pressure types of 3-position 5-way pneumatic solenoid valves
The differences between the sealed, vented, and medium-pressure types of 3-position 5-way pneumatic solenoid valves are as shown in the following figure: This figure is a symbol diagram of the working principles of the sealed, vented, and medium-pressure types of solenoid valves.
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Sealed type: In the case where neither of the two coils is powered. The pressure in the front and rear chambers of the cylinder remains unchanged at the state after the last coil loses power. The air intake is closed. The exhaust port is closed. (If it remains in this state for a long time, due to the slight leakage at each connection point, this balance will gradually be disrupted.)
Medium discharge type: In the case where neither of the two coils is powered. There is no pressure in either the front or rear chamber of the cylinder. When the intake port is closed, the pressure in the front and rear chambers of the cylinder is discharged respectively through the two exhaust ports of the solenoid valve.
Medium-pressure type: When neither of the two coils is powered on, the pressure in the front and rear chambers of the cylinder remains unchanged at the state after the last coil loses power, and continuous pressure is applied to make the pressure in the front and rear chambers of the cylinder consistent with the pressure at the intake end. The air intake is open. The exhaust port is closed.
The expression methods of the order codes for 3-digit 5-way pneumatic solenoid valves of sealed type, vented type and medium-pressure type are shown in Figure 2
An electromagnetic valve refers to a valve that is controlled by means other than human power, such as electric, pneumatic, hydraulic or electromagnetic drive. Its features are: convenient to use and safe; It can be controlled on-site or remotely. It can control a single solenoid valve or centrally control multiple solenoid valves. It can perform simple switch control as well as adjustment control. In combination with electronic computers, programmed control can be achieved. Due to the need for remote control, there is usually an electromagnetic valve signal feedback light signal or a 4-20mA signal feedback for valve control. Nowadays, in sectors such as chemical engineering, papermaking, food, medicine, power plants, steel mills, urban and drainage, and gas, due to the need for large-scale precise flow control, the application of valve automation is becoming increasingly widespread.
Solenoid valves are indispensable fluid control devices in various sectors of the national economy, such as petroleum, chemical engineering, power stations, long-distance pipelines, shipbuilding, nuclear industry, various cryogenic engineering, aerospace, and offshore oil extraction. After years of development, China has the largest number of valve enterprises in the world. There are approximately 6,000 solenoid valve enterprises of various sizes, among which 900 have an annual output value of over 5 million yuan. From the perspective of product conditions, China's valve industry is currently capable of manufacturing over a dozen major categories of products, such as solenoid valves, gate valves, globe valves, ball valves, safety valves, check valves, throttle valves, plug valves, pressure reducing valves, diaphragm valves, steam traps, emergency shut-off valves, etc. The maximum operating temperature reaches 570℃, the minimum is -196℃, and the maximum pressure is 600MPa. The maximum diameter reaches 5,350 millimeters.
Above is the differences between the middle-sealed, middle-vented, and medium-pressure types of 3-position 5-way pneumatic solenoid valves content, to learn more related information, visit https://www.joosungauto.com/.
