Automatic exhaust clack

The utility model discloses an automatic exhaust clack, including the valve base, be close to the valve support of connecting valve base and valve dish respectively in valve dish and both ends on thevalve base, one side of being close to valve support department on the valve base is equipped with the gear, the both sides of gear are equipped with the limiting plate, limiting plate inboard is equipped with the rack with gear engaged with along the vertical direction in, the top of rack is equipped with the touch multitouch that supports of the valve support lower surface that is used for contradicting, the gear is equipped with the handle that is used for transmitting gear outside the axial extension goes out the limiting plate, be equipped with the fixed subassembly that is used for the fixed touch multitouch of supporting height on the valve base, and the rack carries out the up -and -down motion along vertical orientation, has realized adjusting the height to touch multitouch, fixedsubassembly on the valve