Pipeline gas self-closing valve

The utility model belongs to the technical field of self-closing valves, and relates to a pipeline gas self-closing valve which comprises a valve body, a valve cover is fixedly connected to the middle position of the top of the valve body, an L-shaped plate is fixed to the inner wall of the valve body, a plugging opening is formed in the L-shaped plate, the valve body is divided into a first cavity and a second cavity through the L-shaped plate, and the first cavity and the second cavity are communicated through the plugging opening. A sliding groove is formed in the top of the first cavity, and a sliding rod is slidably connected into the sliding groove. The pipeline gas self-closing valve has the beneficial effects that through the combined action of the sliding groove, the sliding rod, the rotary knob, the ball body, the through hole and the first sealing ring, the speed of gas flowing in a pipeline can be controlled, and through the combined action of a pull rod, a threaded cap, a gasket, a diaphragm, a m