Cartridge Mechanical Seals

A cartridge mechanical seal is a preassembled unit containing faces, sleeve, gland, springs and temporary setting devices. Its controlled factory-style assembly fixes the working position before installation, reducing measurement errors and simplifying the fitment of single or dual seals to compatible pump chambers.

Key facts

Family: Rotary & Mechanical Seals
Common types: Single cartridge, Dual cartridge, Tandem cartridge, Split cartridge, Slurry cartridge, Bellows cartridge
Materials: Stainless steel, Duplex steel, Silicon carbide, Tungsten carbide, Carbon graphite, FKM (fluoroelastomer)
Used in: Process pumps, Chemical plants, Oil and gas systems, Power station pumps, Pulp and paper mills

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Types

Single cartridge
Dual cartridge
Tandem cartridge
Split cartridge
Slurry cartridge
Bellows cartridge

Materials

Applications

Process pumps
Chemical plants
Oil and gas systems
Power station pumps
Pulp and paper mills

What to send for a quote

shaft diameter
gland pilot and bolt pattern
chamber dimensions
port requirements
process fluid and duty

Questions about cartridge mechanical seals

What should I send to identify cartridge mechanical seals?

Send shaft diameter, gland pilot and bolt pattern, chamber dimensions, port requirements, process fluid and duty. Provide the gland bolt circle, pilot, shaft sleeve and all flush, quench or drain connection details. A clear photograph, drawing or readable reference can resolve details that dimensions alone do not show.

How should I select cartridge mechanical seals?

Choose single or dual arrangement, balance, faces, secondary seals and support ports from the process and pump chamber. Confirm the mating parts and operating environment before ordering, since an apparently similar size can use a different profile, material or internal arrangement.

Last updated: 2026-10-08