Bellows

Rubber bellows are widely used in the mechanical seal industry where the bellows acts as a spring element that ensures proper sealing. They are made of rubber and are used to keep moving mechanical parts free of dust and moisture. It enables the rubber bellow to expand and shrink while maintaining a tight seal. A secondary dynamic seal is not required for this design. Because it is a static secondary seal that stays in place against the shaft, sleeve, or gland of the pump, Bellows Mechanical Seals are also known as non-pusher seals.