The difference between the DO light-duty floating seal and the DF heavy-duty floating seal is not only the rubber ring, but the difference in the appearance of the metal ring is also the difference in the way of interaction between the rubber ring and the metal ring.

The DO type floating seal is composed of two circular rubber rings and a metal ring, and the contact surface between the metal ring and the rubber ring is slope-shaped. Generally, the circular rubber ring is squeezed by the seat cavity and transmits the force to the metal ring to complete the seal.

The DF heavy-duty floating seal is composed of two rectangular rubber rings and a metal ring, and the contact surface between the metal ring and the rubber ring is L-shaped. The transmission force provided by the torque of the rubber ring during the operation of the heavy-duty floating seal stabilizes the operation of the floating seal in the seat cavity.