Small flow high pressure reversing valve

The utility model provides a small flow high pressure reversing valve. Four O-shaped rings are arranged on a spindle of the reversing valve. A seal ring is arranged at the contacting portion formed by the spindle and a valve body. One end of the spindle is connected with a stepping motor. The spindle is provided with an electronic ruler. An output and an input are arranged at the upper portion of the valve body. Two reversing valve ends B are arranged between the output and the input. Two reversing valve ends B are connected through a channel B. Two reversing valve ends A are arranged at the lower portion of the valve body. Two reversing valve ends A are connected through a channel A. The reserving valve is applied to the petroleum and geology experiments in small flow mode, can reversely dispose the working fluid, control the flow quantity and work in high pressure environments, utilizes the electronic ruler to collect displacement data of the spindle, and controls the flow velocity and the flow quantity of