Mechanical Seal
MECHANICAL SEALS
Cartridge seals
Cartridge seals have the mechanical seal pre-mounted on a sleeve, and these fit directly over the shaft. The advantage with cartridge seals is that they eliminate the requirement for seal setting measurements upon installation
Balanced seals
Balanced mechanical seal arrangements refer to a system where the forces acting at the seal faces are balanced. As a result of the lower face loading, there is more even lubrication of the seal faces and longer seal life
Unbalanced seals
Unbalanced mechanical seal types are commonly employed as a more economical option to the more complex balance seal. Unbalanced seals may also exhibit less product leakage due to tighter control of the face film, but as a result can exhibit much lower mean time between failure
Pusher seals
Pusher seals use a secondary seal that moves axially along a shaft that will have the contact at the seal faces.
Non-pusher seals
Non-pusher seals do not have a secondary seal moving along the shaft that helps maintain seal face contact. These seals have the secondary seal in a static state at all times
Conventional seals
Conventional seals are typically lower cost and often installed on general service equipment. These seals require higher operator skill to service as they installed as individual components.