Y-type filter and feed pump inlet filter are used to remove solid impurities in pipe fluid. The filter selects the filter net of different specification, makes the filter barrel to be put in the shell (or the pipeline), the filter fluid flows through the filter barrel to filter down the impurity, achieves the purpose of purifying the fluid. The feed pump inlet filter is usually installed on the pipe in front of the pump to ensure the normal operation of the pump and extend its service life.