Unbalance Seals

Teflon Bellow Unbalanced Mechanical Seal

Spring-less PTFE bellow design keeps metal springs completely out of contact with the process fluid
Unbalanced face construction offers a simpler, more economical build for standard-pressure chemical service
Exceptional chemical resistance across acids, caustics, and solvents that would degrade elastomer seals
No dynamic secondary elastomer, removing the risk of swelling or hardening in aggressive fluids
Self-cleaning bellow convolutions tolerate mild crystallizing media without seizing
Simple, low-part-count construction reduces failure points in corrosive or hazardous fluid handling
Works reliably regardless of shaft rotation direction, without needing a design change

PRODUCT DESCRIPTION

A Straightforward Seal for Corrosive Fluid Handling

Fitting a Teflon bellow unbalanced seal involves sliding the bellow assembly onto the shaft and setting it to its correct pre-compressed length, since the PTFE bellow supplies its own closing force rather than relying on a coil spring. The stationary seat is then positioned squarely in the gland and locked once shaft alignment is confirmed. Being an unbalanced design, it's a more economical option than its balanced counterpart, making it a sensible choice for chemical services that need PTFE's chemical resistance but don't operate at the higher pressures that would call for a balanced face. It remains a dependable option wherever elastomer compatibility runs out and the process fluid stays within moderate pressure limits. For complete step-by-step installation instructions and torque specifications, refer to our detailed installation guide on the blog.

TECHNICAL SPECIFICATIONS