Y-strainer (water strainer) belongs to the series of pipeline
strainers, and can also be used for filtering gas or other large particles. When installed on the pipeline, it can remove large solid impurities in the fluid, so that machine equipment (including compressors, pumps, etc.) and instruments can work normally, stabilizing the process and ensuring safe production.
Y-strainer (water strainer) has the advantages of simple manufacture, convenient installation and cleaning, etc.
Bubble point method
When the filter membrane and filter element are completely soaked with a certain solution, and then pressurized on one side by air source (our instrument has an air inlet control system, which can stabilize the pressure and adjust the air intake). With the increase of pressure, the gas is released from one side of the filter membrane, showing that bubbles of different sizes and numbers appear on one side of the membrane, and the corresponding pressure value of those bubbles is judged by the instrument, which is called bubble point.
Diffusion flow method
Diffusion flow test means that when the gas pressure is 80% of the bubble point value of the filter element, a large amount of gas has not passed through the hole, but only a small amount of gas dissolves into the diaphragm of the liquid phase first, and then diffuses from the liquid phase to the gas phase on the other side. This part of gas is called diffusion flow.
The bubble point value is only a qualitative value, and it is a long process from the beginning of foaming to the last group of foaming, which cannot be accurately quantified. In contrast, the diffusion flow value is a quantitative value, which can not only accurately determine the integrity of the strainer, but also reflect the porosity, flow rate and effective filtration area of the membrane, which is why foreign manufacturers now use the diffusion flow method to test the integrity.
Water intrusion method
This method is specially used for testing hydrophobic filter elements. The hydrophobic membrane is resistant to water. The smaller the pore size, the greater the pressure needed to squeeze water into the hydrophobic membrane. Therefore, under a certain pressure, measure the flow rate of water squeezed into the filter membrane to judge the pore size of the filter element.
