Pump Shaft Seals

In practical use, the basic rotating face mechanical seal principle is adaptable to serve a tremendous number of sealing needs: standard mechanical seals can suit most requirements-including temperatures to 500 degrees F and shaft speeds to 3600 RPM through the choice of secondary seal and the combination of seal and seat face materials which are offered. Seals can be ordered in balanced configurations to seal pressures above 200 psi, or used in a multiple (double seals) for extremely high pressures or especially severe fluid services....Special mechanical seals can be furnished to meet the most demanding of industrial applications considering pressure, temperature, speed or fluid.
Mechanical seals designs range from the work horse "single spring" mechanical seals, to highly engineered double cartridge seals for extreme applications.

Single spring mechanical seals:

Utilize single spring mechanical seals coiled in a right of left hand design to accommodate left and right hand turning pumps. They have the flexibility to accommodate misalignment, shaft deflection, and break away shock loading. It resists clogging in extremely viscous fluids.

We specialize in single spring mechanical pump shaft seals for rotary / centrifugal pump applications. It's easy to replace your pump seals if you know what they are. If you do not have a pump seal number such as PS-100, you can identify what kind of seal you have, by comparing your mechanical seals components to the pictures.

Type A Type B Type C Type D Type E
(Click the above links for a cross sectional drawing of the selected seal.)

Spring Seals

Mechanical Seals: Working Length

The "working length" of the seal is critical to your seal application.  To identify  the working length, measure your mechanical seal end to end as it is pictured above, this is your seals "total length".  From this you must subtract 50% of the   uncompressed spring length. This is your mechanical seals working length.

For seal dimensions follow this link and look up the seal by shaft size and "Type" (A,B,C,D,E,F,K,N,Q,R,S,T or ,U)

For instructions on how to identify a used seal follow this link

To make sure your pump seals stationary seat fits, it's a good idea to provide the inside dimension of the bore it will be fitting into.  The outside dimension of your mechanical seals stationary seat is helpful but more difficult to obtain an accurate measurement. Most pump seal stationary seats have rubber cups or o-rings that must be compressed when they are installed.

Seat Types
 

Mechanical Seals: Material Codes

A sample material code could be:  B C F L F
 
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