Mixer Seals

Mechanical Seals




Mixer and Agitator Seals


Mixer & Agitator Brochures

Mixers and agitators offer a unique problem for mechanical seals.  Because most mixers or agitators are mounted on top or on the side of a vessel the long shaft being used to mix or agitate usually has an issue with run out.  The longer the shaft the bigger the run-out.

One solution is to mount the seal faces in a fashion that allows run out.  Seals like a Type 19 however are not always required.  In some applications a common single cartridge or double cartridge seal may be considered.

In the right conditions a mechanical seal can operate dry but key issues must be considered.

How much heat is being generated by the seal faces? The speed of the shaft and the materials of construction of the mechanical seal are of even greater importance than a flushed/lubricated seal. The best combination of seal faces is Carbon Vs. Silicon carbide due to the low friction generated between these two faces.  Chemical compatibility of the product being sealed must of course be considered.

If conventional double seal with environmental controls are utilized  caution must be taken to be certain enough lubrication is provided without contamination of the product being mixed.


Mixer and Agitator Seal

Style 19 Features

Preassembled, preset double cartridge seal for easy installation;

Can withstand extreme shaft run-out;

Springs are isolated from product to prevent clogging;

Non-fretting static 0-ring eliminates shaft wear;

Stationary seal face and spring design minimize vibration and harmonic problems;

No minimum stuffing box requirements;

Closed loop flush system prevents contamination of product;

Pressure tested at factory before shipment;


The determination if a seal like a type 19 mixer seal is required depends on several factors.  You must consider the run-out of course which should be measured with a dial indicator.  If the run-out is greater than 0.005" a seal designed for higher run-out should be considered.


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

Phone: 714-593-9780

Fax: 714-593-9701



@2016 American Seal & Packing | Gaskets | Seals Online Shopping