Pump Shaft Seals

Face Materials

Pump Seals come in a wide range of designs however the most important factor.

Face Materials

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In-line Pump Seals

The term In-line seals simply refers to seals that are mounted to a shaft or sleeve.

In-line Pump Seals

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Metal Bellows

Metal bellows mechanical seals feature a bellows core made of one of several types...

Metal Bellows

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PTFE Pump Seals

Mechanical seals often need to be used in chemical applications.

PTFE Pump Seals

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In Line Seals

The term In-line seals simply refers to seals that are mounted to a shaft or sleeve but are mounted independently as individual parts. Unlike Cartridge seals which is a unitized set of rotating, stationary, sleeve and gland components.  In-line seals are mounted to an existing sleeve or shaft.  The stationary the in-line seal runs against is independently  press fit (usually), into a bore and can be purchased separately from the in-line seal.

In-line seals can be any of the following

* Single Spring Seals
Single Spring Seals
* Multiple Spring Seals
Single Spring Seals
* Metal Bellows Seals
Metal Bellows Seal
* PTFE Bellows Seals
* Wave Spring Seals

Selecting the right In-line Mechanical seals depends on your service. Common versions like our ASP-Type 8 and ASP-Type 9 are available on our e-commerce site www.sealsales.com. But which style is best for you? We like our MP60 because it has mutltiple advantages including:

Less prone to clogged springs. While both Our type 8 and MP60 do have an o-ring to block contamination and clocking of the springs, the MP60's oring is static, so it does not suffer the movement that can allow solids to get past the dynamic o-ring of a type 8. We repair seals so we have seen many seals of this design with clogged springs.

An MP60 actually is rebuilidable in the field. With a type 8 and many other in-line seals, the seal must be removed packaged up and shiped to the repair facility of your choice (we hope it's ours). If you buy a seal repair kit for a fraction of the cost of a new seal, you can clean the seal, remove the seal face (just pull it off), replace the o-ring and press fit by hand the new seal face. In 10 minutes you can can be reinstalling the seal into you pump.

If we are dealing with chemical applications, out ASP-Type 9 is an industry standard style seal and has been proven to hold up to chemicals provided the metalurgy is compatible. If not than your may want to use a PTFE bellows seal.

Metal bellows seals have their place too. They like the MP60 have stationary o-rings and as a result clog less than other seals. We work with some pump shops that only use metal bellows seal due to their reliability.

Regardless of the seal you choose we do offer them with hard faces (Silicon Carbide or Tungsten Carbide) or carbon. Various elastomers are also available including Viton, EPDM, Buna-N (Nitrile) or Aflas.

Regardless of the seal you choose, every mechanical seal has a method of pressing one face against another (such as a bellows, or spring). If it is mounted to the shaft independently of the stationary face, it qualifies as an in-line seal.

In-line seals are the least expensive approach to installing pump seals into pumps.  They are also the more difficult to install.  It is critical the that during the installation process seal length is carefully calculated to obtain the correct positioning of the seal on the shaft.  Over compression of the seal face will result in premature wear.  Insufficient compression will result in leakage.

If you have any questions please contact us at:   E-Mail  about your pump seals applications.

Phone: 714-593-9780                                          Fax: 714-593-9701