TPZ42H automatic leveling valve seal structure principle is developed on the basis of existing flexible wedge gate valve structure, namely, the position of the chamber c wedge gate valve seat in an existing valve, each equipped with an automatic oil pressure seal lubrication mechanism, the agency cylinder filled with sealant can be moved along the inner surface of the cylinder piston and seat composition, when the valve is closed, the valve body cavity filled with medium pressure after the valve, ie the downstream end of the valve, Since the mediator who was cut off, and the chamber to form a pressure difference, in this pressure difference, push the piston downward, thereby compressing the sealant inside the fuel tank, through the seat into the seat sealing surface of the channel-shaped sealing film , in order to achieve sealing. In the front and rear parts of the body outside, each equipped with a seal pressed into the body fat compensation, when the valve is required to compensate for seal grease sink drain, simply rotate the gland, seal the hole through the body fat can enter the valve seat seal surface and achieve a seal. ? Ordering Information: one, ① automatic leveling valve seal product name and model automatic leveling seal ② ③ caliber automatic leveling valve seal valve with an attachment so we correct for your selection.