Fire-retardant breather valve with adjustable spring

The utility model discloses a fire-retardant breather valve with an adjustable spring, which comprises a valve body, the top of the valve body is fixedly connected with a first valve cover, the outer wall of the valve body is fixedly communicated with a connecting pipe, one end of the connecting pipe is fixedly communicated with a second valve cover, and the top of the first valve cover and the top of the second valve cover are provided with through holes. A vertical sleeve is fixedly connected to the inner wall of the through hole, adjusting mechanisms are installed in the first valve cover and the second valve cover correspondingly, and a ball seat is rotationally connected to the interior of the connecting pipe. Through the arrangement of the vertical sleeve, the T-shaped rod, the dial, the spring, the ball, the valve rod, the valve disc, the valve seat and the guide rod, the T-shaped rod rotates to enable the spring to stretch out and draw back, the extrusion force on the ball is changed, the subsequent p