General / advantages
Pusher type mechanical seals with O-ring or other elastomeres utilize springs to keep the faces together. For bellows seals, the bellows itself acts as a spring to close the faces, provides a dynamic seal force, and transmits the torque from the shaft to the face. Hence, the bellows seal offers a number of advantages over other pusher type seals. These can be summarized as follows:
- No shaft sleeve is required because no moving parts or sliding elastomeres are in contact with the shaft
- Independent from direction of rotation.
- Easy assembly
- A wide range of applications. Higher and lower temperatures can be covered by elimination of the organic elastomeres.
- No hang-up on the shaft sleeve:
Hang-up of the seal can also be generated by fretting due to corrosion or wear of the shaft sleeve in the area of the O-ring or the elastomere.
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