Solenoid valve sealing test

Often when we select a solenoid valve, we need to refer to the sealing performance of the solenoid valve. So what is the sealing performance of the solenoid valve? What are the leakage conditions? Why do customers pay special attention to the sealing performance?How is the sealing of the solenoid valve tested?Shenzhen Hiraysi will explain the above issues for you one by one.

To open and close the solenoid valve, a force or torque needs to be added to it, which is usually called the opening and closing force and the 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, the corresponding friction must be overcome, such as the friction between the valve stem and the nut thread, the friction between the support at one end of the valve stem, the friction between the valve stem and the packing, and the friction generated by other parts.The above reasons also explain why the corresponding closing force and closing torque need to be applied when the valve is closed.The force and torque required to open and close the solenoid valve are constantly changing. Generally, the force and torque are the largest at the first and last moments of opening and closing.When designing and manufacturing solenoid valves, generally designers hope that the closing force and closing torque should be as small as possible.

Generally, the ability of the sealing components in the solenoid valve to prevent medium leakage is called the sealing performance of the solenoid valve.When customers purchase solenoid valves, sealing as a technical parameter is also one of the important selection criteria.In a general sense, we say that the sealing parts of the solenoid valve mainly refer to the joint between the valve stem and the stuffing box, the connection between the valve cover and the valve body, and the connection between the two sealing surfaces of the opening and closing parts and the valve seat.Usually we often talk about the phenomenon of internal leakage and external leakage. External leakage usually refers to the leakage of the first two sealing parts, and internal leakage refers to the leakage of the last situation. To put it bluntly, internal leakage means that the sealing is not tight, and external leakage means that the medium leaks from the inside of the valve to the outside of the valve.Both leaks will affect the work of the solenoid valve, and sometimes accidents may occur.Internal leakage mainly affects the valve's ability to cut off media, so in cut-off valves, internal leakage is an important criterion for judging the quality of the valve.External leakage will cause waste of media and pollute the environment.Especially when the medium is toxic, radioactive, or flammable and explosive, external leakage is absolutely prohibited, so the selection of this type of solenoid valve is even more crucial, and reliable sealing performance must be required.

Now that we have some knowledge about the sealing of solenoid valves, we may have a new understanding of the sealing of solenoid valves. However, it is more important to realize the importance of sealing of solenoid valves, and we will pay more attention to it, so as to avoid avoidable accidents in future production and life.

Since the sealing performance of the solenoid valve is so important, how is its air tightness tested?

Some use traditional water immersion testing, but this method has many defects in testing the sealing of solenoid valves, such as causing secondary pollution and relying heavily on human eyesight.Therefore, the detected sealing performance of the solenoid valve is unreliable.And more solenoid valve manufacturers use Hirays' air tightness tester.Hiraysi's air tightness test uses compressed air as the testing medium, which has low testing cost, does not cause secondary pollution, and is highly efficient.Just make a simple detection tool.Then put the solenoid valve into the tooling to start the Hai RuisiAir tightness detectorOnce the leakage value of the solenoid valve is detected, the sealing performance of the solenoid valve can be obtained based on the leakage value.