Mixers and agitators offer a unique problem for pump 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 pump 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.

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;

Phone: 714-593-9780

Fax: 714-593-9701