Valve body structure of pneumatic straight-through type diaphragm valve of engine

The utility model discloses a valve body structure of a pneumatic straight-through type diaphragm valve of an engine, and relates to the technical field of diaphragm valves, in particular to the valve body structure of the pneumatic straight-through type diaphragm valve of the engine, which comprises a valve body, a limiting sleeve is fixedly sleeved above the valve body, and a fixing plate is fixedly sleeved at a position close to the top of an inner cavity of the limiting sleeve. A movable plate is movably sleeved with an inner cavity of the limiting sleeve. The limiting sleeve is fixedly installed on the bottom face of the limiting sleeve, meanwhile, the floating ball is movably installed in the limiting sleeve in a sleeved mode, the trigger switch is installed in the limiting sleeve, the alarm is installed on the outer side of the limiting sleeve, and the trigger switch and the alarm are connected through the wire. And meanwhile, when the sealing effect of the sealing sleeve is not good, the floating ball