The BQFD (Bellows Quench Flush Drain) range of single cartridge mechanical seals uses many of the same modular parts as a BSIV™ but has the added features of Quench and Drain, making it usable in more diverse applications.

Features:

• Cartridge design for reliable installation
• Hydraulically balanced seal face loading, which maximizes seal life and also allows for vacuum service capability
• The BQFD range has quench flush and drain ports with optional restriction bush (BQFD-R)
• BQFD sizes available from 1.000″ to 5.000″ (24mm – 125mm)

BQFD Metal Bellows Single Cartridge Seal

Major advantages of using AESSEAL® Metal Bellows Seals

• 50% more bellows than the industry standard means there is less stress on each convolution in the bellows stack which helps increase seal life.It is for this reason that this seal is more able to accommodate installation tolerances and will maintain a more consistent face pressure
as the seal wears in use.
• Finite Element Analysis was used to optimize the bellows convolution profile on its inside diameter at 45º which means minimal stress on the weld beads.
• The standard bellows material, Alloy 276, has superior mechanical and corrosion resistance properties compared to other industry standard
bellows materials such as 300 series Stainless Steel or Alloy 20.The seal face holder and drive end are inventoried as standard in
316L Stainless Steel.
The main benefit of using a metal bellows seal is the removal of the semi-dynamic sliding elastomer from a conventional pusher type seal. This means that bellows seals can be used where chemical attack on this elastomer is a problem.

The seal is offered with the following features:

Quench, Flush and also Drain environmental port options
Cartridge design for reliable installation
Hydraulically balanced inboard seal faces
Independent seal face design
Modular construction for maximum adaptability

Download catalog for more information: Download cataloge