Mechanical Seals

American Stainless Pumps use mechanical seals to to prevent leakage around the motor shaft. The stationary element shown above is pressed into the pump sealplate, and oriented so that the lapped surface will contact the mating face of the rotating element which is pre. The stationary element is mounted in a rubber boot, providing

Use the following table to select the correct letter designation for the pump catalog number. It is the 7th character in the catalog code.

i.e. C14315BBD1F

Selecting Your Seal Face

The materials used for your mechanical seal are dependant on the liquid that is being pumped. The first material is used on the rotating face of the mechanical seal. The second material is the stationary face of the seal. (rotating / stationary)

Carbon/Ceramic (Car/Cer):

• Used for clean liquids. No particles to scratch the face of the seal. Pump must always have liquid in the system before and during start-up. Failure to do so will result in failure of the mechanical seal.

Carbon/Silicon Carbide (Car/SiC):

• Used for applications that may have a dry start-up. The pump can start without water in the pump for a few seconds. The Carbon face prevents the face of the seal from burning up during a dry start-up.

Silicon Carbide/Silicon Carbide (SiC/SiC):

• Used for liquids with abrasives. Silicon Carbide is a hard surface that prevents scratching.

• Pump must always have liquid in the system before and during start-up. Failure to do so will result in failure of the mechanical seal. 

Selecting Your Seal and O-ring Elastomers

Buna:

• Water applications
• Oil Solutions
• Aromatic fuels and solvents
• Capable of handling temperatures up to 225°F

Viton:

• Oil Solutions
• Good chemical resistance
• Animal/Vegetable Oil
• Aniline
• Hydraulic Fluid
• Capable of handling temperatures up to 400°F

EPR/EPDM:

• Used in the presence of heat or steam
• Ozone
• Acids
• Alkalis
• Capable of handling temperatures up to 350°F