High-pressure automatic air vent valve for water mist fire extinguishing system

The invention discloses a high-pressure automatic air vent valve for a water mist fire extinguishing system. The high-pressure automatic air vent valve comprises a valve body, valve elements and a floating body, wherein the valve body comprises an upper cavity, a spacing body, a lower cavity and a base, the upper part of the spacing body is connected with the upper cavity through a screw thread, the lower part of the spacing body is connected with the lower cavity through a screw thread, and the lower cavity is connected with the base through a screw thread; the valve elements are divided into two groups, wherein one group of valve element is composed of a main valve element and a third O-shaped ring, the main valve element is connected with a valve rod passing through the spacing body through a screw thread, the other group of valve element is composed of a check ring, a leakage valve element and a fourth O-shaped ring, the leakage valve element is connected with the body of the spacing body through a screw thread and is sealed through the fourth O-shaped ring, and the check ring is connected with the body of the spacing body through a screw thread; and the floating body comprises a floating ball and a valve rod, wherein one end of the valve rod is connected with the floating ball, and the other end of the valve rod is connected with the main valve element. The high-pressure automatic air vent valve can be used for realizing automatic air venting in the using process, so that the automation degree and safety performance of the fire extinguishing system are improved.