Filters valve, filtration equipment with hydraulic control valves and precision machinery products must be easy to plug. The import side is usually installed in the hydraulic control valves and other equipment to prevent particulate impuritiesinto the channel, causing blockage so that the valve or other device to failure of normal use. The filter structure is simple,small flow resistance, is available online to exclude dirtwithout having to dismantle. Ah rod telescopic filter also hasthe characteristics of the installation length adjustable, easy assembly and disassembly. Filter mesh may need to set upthe net for catching rabbits.