Water purifier

A water purifier, comprising:

• a first filter tank and a second filter tank for filtrating liquid;
• a flow system including, at least, a first channel in which the liquid is filtrated in at least one of the first filter tank and the second filter tank, a second channel in which the liquid is filtrated in the second filter tank and the first filter tank is washed, and a third channel in which the liquid is filtrated in the first filter tank and the second filter tank is washed;
• a plurality of valve mechanisms configured to be opened and closed so as to perform switching among the first, second, and third channels;
• the water purifier having a purification mode in which the liquid flows through the first channel in the flow system, a first washing mode in which the liquid flows through the second channel in the flow system, and a second washing mode in which the liquid flows through the third channel in the flow system, and
• a switching portion configured to mechanically actuate the plurality of valve mechanisms to perform switching among the purification mode, the first washing mode, and the second washing mode such that the modes are selected cyclically in order of the purification mode, the first washing mode, the purification mode, the second washing mode, and the purification mode,
• each of the valve mechanisms working in junction with the operation of the switching portion.