| 摘要 |
External filter for filtering fluids, especially water in aquarium, is composed of a filter container, a filtering packs, a cover unit, an engine unit together with a rotor and a working chamber with a piston unit and a non-return valve. Between the working chamber ( 22 ) with the piston unit ( 17 ) and the inflow conduits of fluid circulation is situated durably separately fastened, preferably rotationally, the control unit ( 9 ) with the controlling element ( 1 ) assembled movably towards the control unit ( 9 ) having a fluid inflow hole ( 6 ), a fluid outflow hole ( 2 ) and a hole of pumping cycle ( 4 ). Reciprocal position of fluid inflow hole ( 6 ) and fluid outflow hole ( 2 ) corresponds to the inflow terminal ( 11 ) outflow terminal ( 12 ) of fluid distribution situated in the control unit ( 9 ) and between working chamber ( 22 ) and hole of pumping cycle ( 4 ) the control valve ( 3 ) is situated.
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