(中文) 电磁阀正反区分的实用技巧与常见误区

Practical Techniques and Common Misconceptions for Distinguishing Positive and Negative Solenoid Valves

Electromagnetic valves play a crucial role in various fluid control systems, and correctly distinguishing their positive and negative sides is a key step in ensuring the normal operation of the system. However, in practical operation, many people have some confusion and misunderstandings about the positive and negative differentiation of solenoid valves. Below, we will explore the relevant practical skills and areas that need attention.

Firstly, practical techniques for distinguishing the positive and negative directions of solenoid valves. As mentioned earlier, observing the markings on the valve body is the most direct and effective method. But sometimes, due to various reasons, the markings on the solenoid valve may be blurry or missing. In this case, we can determine by examining the connection port of the solenoid valve. Generally speaking, the inlet end of an electromagnetic valve is connected to a pressure source, such as the high-pressure end of a liquid or gas in a pipeline, while the outlet end is connected to equipment or pipelines that require fluid control. The forward and reverse of the solenoid valve can be determined based on the actual layout and pressure flow direction of the system.

In addition, for some small solenoid valves, their structure is relatively simple, and we can judge it by hand feel. Gently shake the solenoid valve. Some solenoid valves have a certain amount of movement space inside the valve core. By sensing the direction and position of the valve core movement, it can also assist in determining the flow direction of the fluid. For example, if the valve core is easier to move at one end, then that end may be the inlet end, because during normal operation, the pressure of the fluid will push the valve core towards the outlet end.

There is also a situation where for some special materials or special purpose solenoid valves, there may be some special structures inside to prevent fluid backflow. These structures may have some features in appearance, such as filtering devices or special protective structures at the inlet end, while the outlet end is relatively simple. By observing these details, we can also determine the forward and reverse of the solenoid valve.

However, there are also some common misconceptions when distinguishing between the positive and negative directions of solenoid valves. One misconception is that the positive and negative differentiation methods for all solenoid valves are the same. In fact, different types and brands of solenoid valves may have differences in structure and design, and the methods for distinguishing between positive and negative may also vary. For example, the working principles of direct acting solenoid valves and pilot operated solenoid valves are different, and their internal structures also have significant differences. Therefore, when distinguishing between forward and reverse, it is necessary to judge based on specific characteristics.

Another misconception is neglecting the working environment and system requirements of solenoid valves. In some complex systems, the installation position and direction of solenoid valves may be limited by factors such as space and pipeline layout. But even in this case, the solenoid valve cannot be installed arbitrarily, and its positive and negative directions should be determined according to the requirements of the system and the working principle of the solenoid valve. Otherwise, it may cause system malfunctions or malfunction.

Some people believe that as long as the solenoid valve can work properly, there is no need to pay too much attention to its positive and negative aspects. This viewpoint is incorrect. Although in some cases, reversing the installation of the solenoid valve may not temporarily affect its operation, long-term use may have adverse effects on the performance and lifespan of the solenoid valve. As mentioned earlier, installing reverse solenoid valves may cause issues such as valve core wear and seal damage, increasing equipment maintenance costs and failure risks.

In practical operation, we should pay attention to the issue of distinguishing the positive and negative directions of solenoid valves, master the correct differentiation methods, and avoid falling into misunderstandings. By carefully observing, analyzing, and understanding the structure, working principle, and system requirements of the solenoid valve, ensure the correct installation and use of the solenoid valve, thereby ensuring the stable operation of the entire system.