Ash lock pressurizing stop valve

The ash lock pressurizing stop valve comprises a valve body, a valve seat, a valve rod and a valve clack and further comprises a driving device, a first buffering structure and a second buffering structure, and the valve rod is controlled by the driving device to sequentially generate first displacement and second displacement in the direction towards the valve seat so that the valve clack on the valve rod can be tightly pressed on the valve seat; the first buffer structure and the second buffer structure are respectively arranged between the valve rod and the valve clack; the first buffer structure is configured to buffer the valve seat when the valve rod enters the first displacement; the first buffer structure and the second buffer structure are configured to buffer the common valve seat when the valve rod continues to move from the first displacement to the second displacement. The impact force on the valve seat is buffered through two sections, and the situation that due to the fact that the impact force