Balance sleeve

The utility model discloses a balance sleeve. The valve rod is connected with the sealing ball; when the valve rod is lifted to the topmost end; the sealing ball is driven to move upwards to be attached to the side wall of the liquid containing cavity; the liquid in the liquid storage bin cannot reach the through hole; the purpose of preventing liquid in the liquid storage bin from leaking is achieved; when the solution in the liquid storage bin leaks less, the leakage is reduced; the work of the balance sleeve main body is influenced; pushing down a valve stem, the sealing ball is driven to move downwards; at the moment, the sealing ball and the liquid containing cavity are not attached; the sealing ring and the through hole are not attached; saline water is added into the through hole through the liquid injection hole; according to the balance sleeve, the sealing effect of the opening is guaranteed, liquid can be injected into the balance sleeve body in time when the balance sleeve body cannot work due to l