Seal Classification >
of Mechanical Seals
by pusher vs. non-pusher and balanced vs. non-balanced
seals utilize a dynamic secondary seal which moves axially with the
major seal face. Non-pusher seals have a static secondary seal which
stays stationary against the shaft or sleeve.
Defined by the secondary seal type: o-ring or polymer
wedge versus bellow, rubber or metal.
Application fields of each type overlap.
Most apparent distinction is the pressure limit.
Acquisition cost can vary widely.
Reduced closing forces
Reduced power consumption
For pressure up to 3000 psig
Always recommended for volatile liquids
High closing forces
For pressure up to 200 psig
Not recommended for volatile liquids
by face patterns
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