Cartridge Seal

A cartridge seal is a mechanical seal or lip seal(s) that is contained in a preassembled housing to aid in the seal’s installation, maintenance, and replacement.

Component seals are many individual pieces, installed separately, that work together to create a seal. Cartridge seals are self-contained – housing each component in a preassembled unit.

While there are many different types of cartridge seals, here are a few examples offered by Viking Pump:

Cartridge Mechanical Seal	Double Mechanical Seal	Cartridge Triple Lip Seal

Here are some basic steps for installing a cartridge seal. These steps will vary depending on the type of seal and the pump technology it’s going into, but for this example these steps relate to installing a cartridge mechanical seal into Viking Pump’s 4124A Series™.

1. Place the seal installation sleeve into the shaft and lubricate the sleeve and shaft.
2. Slide the seal assembly onto the shaft and over the installation sleeve until the assembly contacts the bracket face.
3. Remove the installation sleeve.
4. Reassemble the pump and set the end clearance.
5. Install the gland cap screws. Do not fully tighten at this time.
6. Turn the shaft several times to center the seal.
7. Tighten the cap screws tight enough to compress the seal gasket.
8. Evenly tighten the seal sleeve set screws to set the collar to the shaft.
9. Rotate or remove the seal spacers and check rotation.
10. Reconnect seal plan or plug unused connections.