How to differentiate between DO and DF

DO lightweight floating oil seals and DF heavy-duty floating oil seals differ not only in the rubber ring and metal ring's external shapes, but also in the way they interact with each other. Floating seal ring manufacturer.

The DO type floating oil seal is composed of two circular rubber rings and a metal ring, with the metal ring and rubber ring contact surface in a sloping shape. Generally, the circular rubber ring is compressed by the seat cavity to transfer force to the metal ring for sealing.

The DF heavy-duty floating oil seal is composed of two rectangular rubber rings and a metal ring. The DO1040B sliding seal installation tool features an L-shaped contact surface between the metal ring and the rubber ring. The operation of the heavy-duty floating oil seal is stabilized within the seat cavity by the transmission force provided by the rubber ring's torque.

Principle of Sealing for Floating Oil Seals

The structure of a floating oil seal typically consists of a pair of wear-resistant metal rings, known as the floating rings, and a pair of rubber components. These are assembled in a specialized sealing chamber called the floating seat.

The floating seal ring is the main component of dynamic sealing, which interacts and rotates against friction. The mica gasket is specifically paired with the back of the floating seal ring and the floating seal seat, the Shanghai DO1040B sliding seal, to accurately position the floating seal ring within the floating seal seat. The rubber ring not only serves as an auxiliary static sealing component but also exerts both axial and radial forces on the floating seal ring. The radial force transmits the moment to the floating seal ring, while the axial force provides the necessary sealing compensation force. Due to its large elastic compensation range, it can ignore certain assembly errors, and when the equipment vibrates, moves, or swings, it can maintain effective sealing contact between the floating seal ring and its sealing surface, achieving the effect of floating sealing.

How long does a floating oil seal design typically operate?

The operating time of floating oil seals can vary due to different ring materials, gasket materials, ring design, and manufacturing processes. Generally, the operating time for low-alloy ring materials is around 2,000 hours, while for high-alloy materials, it's around 10,000 hours. This varies depending on the client and their specific requirements. For example, the installation pressure for DO1040B sliding seals, such as floating oil seals used on shield boring machine cutters, doesn't require an excessively long operating time but needs to be reliable and stable in performance.

DO1040B Sliding Seal Installation Tool - Provided by Beijing Zhongnu Seal Co., Ltd. "Floating Oil Seals, Floating Seals, Mechanical Face Seals, Floating Ring Seals, Floating Seal Rings" Choose Beijing Zhongnu Seal Technology Co., Ltd. Located in: Xijie Jinyujichi, Dongcheng District, Beijing. For many years, Beijing Zhongnu Seal has been committed to providing excellent service to our clients. Contact: Shan Xiaopei. Welcome new and old customers to call, write, visit, and discuss business. Beijing Zhongnu Seal looks forward to becoming your long-term partner!