Cage type filter cage type filter is conveying medium pipeline system indispensable a filter device, the filter are normally installed in pressure reducing valve, relief valve, calm water valve or other equipment inlet end, used to remove the impurity in the medium, to protect the valve and the normal use of equipment. Cage type filter are of advanced structure, small resistance, the drainage is convenient wait for a characteristic. Cage type filter applicable medium for water, oil, and gas. General water network 18 ~ 30 mesh, ventilation network 10 ~ 100 mesh, through oil network 100 ~ 480 mesh. Cage type filter mainly by the takeover, directors, filter blue, flange cover and fasteners, etc. When the liquid through the competent into filter blue, solid impurity particles is blocked in the filter blue inside, and clean fluid through the filter blue, the filter outlet.