Often when we select the type of solenoid valve, we need to refer to the sealing performance of the solenoid valve. What is the sealing performance of the solenoid valve, what are the leakage conditions, and why do customers pay special attention to the sealing performance. How to detect the tightness of solenoid valve? Shenzhen Harris will explain the above questions one by one for you.
Solenoid valve opening and closing need to add a force or torque, usually we call them opening and closing force and opening and closing torque respectively. When the solenoid valve is closed, there needs to be a relative sealing pressure between the two sealing surfaces of the opening and closing parts and the valve seat. At the same time, it also needs to overcome the corresponding friction, such as the friction between the stem and the nut thread, the friction at the support of one end of the stem, the friction between the stem and the packing, and the friction generated in other parts. The above reasons also explain why the corresponding closing force and closing torque should be applied when the valve is closed. The force and torque required for solenoid valve opening and closing are constantly changing. Generally, the first moment and the last moment of opening and closing are the maximum force and torque. General designers in the design and manufacture of solenoid valves, are hoping that the smaller the closing force and torque, the better.
Generally, we call the ability of the sealing parts in the solenoid valve to prevent the leakage of medium as the sealing performance of the solenoid valve. When customers choose solenoid valves, the tightness as a technical parameter is also one of the important selection basis. Generally speaking, the sealing parts of solenoid valve mainly refer to the matching place of valve stem and stuffing box, the connection place of valve cover and valve body, and the connection place of two sealing surfaces of opening and closing parts and valve seat. Usually, we often talk about internal leakage and external leakage. External leakage is usually the leakage of the first two sealing parts, and internal leakage is the leakage of the last case. To put it bluntly, internal leakage is not strictly closed, and external leakage is the leakage of medium from the inside of the valve to the outside of the valve. Two kinds of leakage affect the work of solenoid valve, and even sometimes accidents occur. Internal leakage mainly affects the ability of the valve to cut off the medium, so in the block valve, internal leakage is an important standard to judge whether the valve is good or bad. Leakage will lead to the waste of media and environmental pollution. Especially when the medium is toxic, radioactive or flammable and explosive, leakage is absolutely prohibited, so the selection of such solenoid valve is very important, must require reliable sealing performance.
Now that we know some knowledge about the tightness of solenoid valve, we may have a new understanding of the tightness of solenoid valve, but it is more important to realize the importance of the tightness of solenoid valve, and we will pay more attention to it, so as to avoid the avoidable accidents in the future production and life.
Since the sealing performance of solenoid valve is so important, how to do its air tightness test?
Some of them use the traditional water immersion detection, but there are many defects in this method, such as causing secondary pollution, relying on human eyes to watch and so on. Therefore, the tightness of the solenoid valve detected is unreliable. And more part of the solenoid valve manufacturers use the airtightness tester of Harris. The airtightness test of Harris uses compressed air as the detection medium, which has low detection cost, no secondary pollution and high efficiency. Just make a simple inspection tooling. Then put the solenoid valve into the tooling, and you can start the hirisAir tightness detectorIf the leakage value of the solenoid valve is detected, the sealing performance of the solenoid valve can be obtained according to the leakage value