These seals have been designed for general sealing purpose having a Unique Rubber Bellow secondary seal. The seal assembly is done in such a way that the driving torque is not transmitted through coil spring. The unique rubber bellow seal provides high degree of axial flexibility to compensate for misalignment & lack of concentricity of the shaft and wear due to thrust movement of the shaft. As there is not relative movement between rubber bellow and shaft, there is no fretting & seal can react quickly to any movement. It is generally used in hot & cold water pumps, oil pumps, refrigeration, compressor.
Another type of rubber bellow seals are with outer spring, drives the seal and secures face contact in both directions. These seals are used for Slurries, sewage and waste water.
These seals are equivalent to Eagle Burgmann 560 / Mg1 / MG12, Johncrane Type 1 / 2 / 21 and Flowserve CHEMIEPAC 970