Hydraulic system micro-adjustment device, and tank calibration system comprising the same

A hydraulic system micro-adjustment device for a tank calibration system, the hydraulic system micro-adjustment device comprising:

• a base;
• a piston;
• a valve body;
• a valve core;
• and
• a handle;
• wherein the valve body is internally provided with an inner cavity for receiving the valve core from an upper portion of the valve body;
• wherein the valve core is in threaded connection with the inner cavity;
• wherein the piston is inserted into the inner cavity from a lower portion of the valve body, and the piston abuts against the valve core;
• wherein the lower portion of the valve body is mounted in the base and is in communication with oil passages in the base, and the handle is connected to a top of the valve core;
• wherein the valve core is movable along the inner cavity upon rotation of the handle, thereby pushing the piston to move along the inner cavity so as to change a volume of a cavity formed by the base, the valve body, and the piston;
• wherein an upper portion of the base is provided with a mounting hole, two side portions of the base are respectively provided with an oil passage, which are in communication with the mounting hole, and the lower portion of the valve body is mounted in the mounting hole;
• and
• wherein the volume of the cavity formed by the base, the valve body, and the piston is a first volume when the valve core is screwed to reach a highest point, and the volume of the cavity formed by the base, the valve body, and the piston is a second volume when the valve core is screwed to reach a lowest point, the first volume being twice the second volume.