Closed non-return gulp valve

The utility model relates to the technical field of material mixing, and provides a closed check gulp valve which comprises a valve body and a valve element, an annular groove is formed in the outer wall of a main body of the valve element, and a first sealing ring is arranged outside the annular groove in a sleeving mode. An air inlet channel is formed in the main body, and a plurality of air outlet holes communicating with the air inlet channel are formed in the annular groove; air enters the flow guide cavity and the air outlet channel through the air inlet channel and the air outlet hole, and the air cannot flow reversely due to the action of the first sealing ring, so that the air supply valve has the action of a one-way valve, and material air and materials can be prevented from flowing back to the air supply valve; the device can be installed outside the stock bin and replaced and maintained outside the stock bin, and materials in the stock bin do not need to be completely discharged; the diameter of t