The degree of leakage at the packing of the electric gate valve can be determined by the following methods:
Visual observation: During the operation of the electric gate valve, directly observe whether there is any medium leakage at the packing point. If you can see obvious liquid or gas seeping, dripping, or spraying from the packing, it indicates that there is a leak. The degree of leakage can be roughly judged based on the size and speed of the leakage, such as a small amount of dripping, linear leakage, jet leakage, etc. The leakage amount increases in turn, and the degree of leakage also increases in turn.
Auditory judgment: Sometimes leaked media may produce sound, such as hissing sound when gas leaks, ticking sound or water flow sound when liquid leaks, etc. Hearing can assist in determining whether there is a leak and the approximate extent of the leak. Generally, the louder the sound, the more severe the leak.
Statutory quantity collection: For situations where a brief shutdown is allowed, a collection container can be placed below the filling area to collect the leaked medium for a certain period of time, and then the volume or weight of the collected medium can be measured to accurately determine the degree of leakage. For example, if 10 milliliters of liquid leakage is collected within 1 hour, the severity of the leakage can be evaluated based on this data.
Test paper detection: When the leaked medium has certain chemical properties, corresponding test papers can be used for detection. For example, for acidic or alkaline media, the test paper can be placed near the filler. If the test paper changes color, it indicates a leak, and the size of the leak can be roughly judged based on the degree of color change of the test paper.
3、 Pressure detection method
Import and export pressure difference monitoring: Install pressure sensors at the inlet and outlet of the electric gate valve to monitor the pressure difference in real time. Under normal circumstances, the pressure difference between the inlet and outlet should remain stable within a certain range when the valve is closed. If there is a leakage at the packing point, the pressure difference between the inlet and outlet will gradually decrease, and the degree of leakage can be determined by observing the changes in pressure difference. The more and faster the pressure difference decreases, the more severe the leakage.
Packing box pressure monitoring: Install pressure sensors at the packing box to directly measure the pressure inside the packing box. When there is a leakage at the packing point, the pressure inside the packing box will change, and the leakage situation can be determined by monitoring the pressure change. For example, as the leakage increases, the pressure inside the stuffing box will gradually decrease.
4、 Temperature detection method
Infrared thermal imaging detection: Use an infrared thermal imaging device to detect the electric gate valve and observe the temperature distribution at the packing point. If there is a leak at the packing site, the leaked medium will carry away heat, resulting in a temperature difference between the packing site and the surrounding environment, which will be displayed in different colored areas on the thermal imaging map. By analyzing the size of the temperature anomaly area and the degree of temperature change at the filling point in the thermal imaging image, the degree of leakage can be determined.
Contact temperature measurement: Use a contact thermometer to measure the temperature at the packing and compare it with the temperature during normal operation. If the temperature significantly decreases or increases, and other factors are excluded, it may be due to leakage. For example, when cold water leaks, the temperature at the packing will decrease; When hot air leaks, the temperature at the packing will increase.
5、 Flow monitoring method
Comparison of total flow rate: Install a flow meter to measure the total flow rate of the system throughout the entire process. When the filling of the electric gate valve leaks, the total flow rate of the system will be greater than the flow rate during normal operation. By comparing the actual flow rate with the theoretical normal flow rate, the degree of leakage can be roughly determined. The larger the difference, the more severe the leakage.
Local flow monitoring: Install flow meters near the inlet and outlet of electric gate valves or packing boxes to specifically monitor the flow rate of the medium leaking through the packing. This method can more accurately measure the leakage flow rate, thereby accurately determining the degree of leakage.