Fluid switch for fluid-conducting coupling pipe utilized as transportation path for fluid at hydraulic system at hydraulic excavator, has fluid channel provided from storage space to pipe, where stroke force is applied for emptying space

摘要

The fluid switch (2) has a manual openable fluid channel by which excess fluid is displaced from a pressure medium-conveying pipe (1) to a predetermined storage space. A fluid channel is return-flowly attached by a non-return valve (7) and provided from the storage space to the pressure medium-conveying pipe. A piston return stroke force is applied for automatically emptying the memory space. The storage space is provided in a differential cylinder and a stroke chamber, and a small return stroke chamber generates the return stroke force.