Canadian Consulting Engineer

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Seal Replacement Made Easy: New Cartridge Seals from KSB


Mississauga, Ontario, November 2016 – KSB Pumps has introduced a new family of modular cartridge-type mechanical seals that are optimized for wet or dry-installed wastewater pumps. Two seal stages are arranged in tandem and feature highly wear-resistant silicon carbide primary rings to ensure excellent protection for the pump’s bearings and motor and long, trouble-free service lives.

During development of the 4STQ double mechanical seal module, KSB’s engineers strove to ensure that installation and removal procedures would be as straightforward as possible. The modular design minimizes downtime during maintenance and prevents the seals from being installed incorrectly. There is no need for assembly fixtures or fastening bolts. An internal multi-spring arrangement provides for the required pre-loading for the primary sealing rings. These springs are located in an oil reservoir that protects them from contamination or corrosion due to water ingress. The seal cartridge fits precisely into the installation space, ensuring accurate alignment with the pump’s shaft. This reduces wear and improves service lifetimes. All metal components are manufactured from corrosion-resistant stainless steel while FKM elastomers are used for the O-rings.

The new 4STQ modular seals are designed for KSB’s Sewatec and Amarex wastewater pumps and are suitable for the full range of operating conditions specified for these pumps.

About KSB

KSB Pumps Inc., based in Mississauga, ON, is a member of the KSB Group, one of the world’s largest manufacturers of pumps, valves and systems. KSB’s history dates back to 1871 in Germany, where the company’s global HQ is still located. In 2015, KSB generated a total turnover of € 2.334 billion with a global workforce of 16,196 employees. KSB’s giant product portfolio consists of more than 3,000 different off-the-shelf pumps and valves – and thousands of engineered and customized solutions. KSB Canada has specialized in providing reliable pump solutions for the most challenging applications in industrial and utility power plants, environmental (water and wastewater) facilities, mining and industrial processes. It also offers full commissioning support, maintenance, repair and re-building services for pumps from KSB and other manufacturers.


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