Automatic exhaust valve

An automatic air-discharge valve, comprising:

• a valve body;
• a valve seat;
• a steel ball;
• and
• a pressure regulation spring,
• wherein the valve body is externally connected to a piston, and the valve body is internally provided with an air-discharge channel capable of accommodating the valve seat, the pressure regulation spring and the steel ball, wherein the valve body is externally provided with a screwdriver groove to facilitate installation of the valve on a steering gear piston
• wherein the steel ball is capable of being accommodated in a middle of the air-discharge channel of the valve body,
• wherein the pressure regulation spring comprises a left spring and a right spring arranged on left and right sides of the steel ball, respectively,
• wherein one end of the left spring is supported by the valve body and the other end thereof is supported by the steel ball, and one end of the right spring is supported by the valve seat, and the other end thereof is supported by the steel ball, and
• wherein the valve seat is installed at a bottom of the valve body, and a valve seat air-discharge hole is provided in a middle of the valve seat.