A fixed valve plate having a fixed valve central water passage and a fixed valve side water passage; a first movable valve plate having a first movable valve central water passage; and a second movable valve plate having a second movable valve central water passage and a second movable valve side water passage; wherein two end surfaces of the second movable valve plate are respectively sealedly attached to corresponding end surfaces of the first movable valve plate and the fixed valve plate; and wherein rotating of the first movable valve plate causes the first movable valve central water passage and the second movable valve central water passage communicated or noncommunicating, and rotating of the second movable valve plate causes the second movable valve side water passage and the fixed valve side water passage communicated or noncommunicating.