Home » Pumps » Sealless Technology

The SLM "V" Pump Design The Modular Mag Drive Concept SealLess Magnet-drive Sealless Flexibility by Design

Modular Mag Drive Concept - Features & Benefits

Self Venting

Internal Flush Flow

Balanced Thrust Loads

Journal Bearings

Heating & Cooling

Fully Drainable


Rub Rings

Magnet Drive

Secondary Sealing

Isolation Shell

Thermal Barrier

Removable Drive Frame

Modular Design
Interchangeable modules allow customizing your pump to best meet the requirements of your application with off-the-shelf availability of design variations and accessories.
Your Klaus Union pump can be field-modified to accommodate for a new application.

Maintenance-Free Journal Bearings
Our patented double journal bearing cartridge is maintenance free and user-friendly.
Field assembling of the product lubricated bearing arrangement does not require special tools, o-rings or alignment procedures. Three different Bearing materials are available to provide the most efficient solution for your application – Silicon Carbide (SSIC), Carbon (EK) and Stellite (ST).

Back to Top ↑

Advanced Internal Flush Flow
The internal flush flow utilizes the pumped liquid to lubricate the journal bearings and absorb heat from Eddy Current Losses. A redundant internal system directs the liquid and always maintains sufficient vapor suppression to avoid flashing. To keep the magnet area free from solids, a self cleaning filter can be added. An external feed can be used to lubricate & cool or simply flush the magnet area if desired.

Back to Top ↑

Thermal Barrier
When pumping hot liquids, the thermal barrier protects the oil lubricated ball bearings in the drive frame from overheating.
The chart below illustrates how effective the thermal barrier works – when pumping product at 300 °C the thermal barrier
lowers the ball bearing temperature by appr. 28 °C - increasing the life time of the bearings.

Back to Top ↑

Six Isolation Shell Options
The isolation shell separates the pressurized product area from the surrounding atmosphere. To meet the specific requirements of your applications, Klaus Union offers six different isolation shell options.

  1. Hastelloy®-C4
    is our standard isolation shell material - providing a safe and efficient solution.
  2. Titanium Alloy (LT31)
    is an upgrade to our Hastelloy® shell when higher pressure ratings and increased efficiency are required.
  3. Pure Titanium (RT15)
    handles extremely aggressive chemicals where Hastelloy®-C4 or Titanium Alloy (LT31) would not withstand.
  4. Ceramic (Zirconium Oxide)
    is one of two non-metallic isolation shell options to eliminate Eddy Current Losses and handle extremely aggressive liquids.
  5. Carbon fiber with PTFE liner
    is our second non-metallic isolation shell option.
  6. Double Wall Isolation Shell
    provides true dual containment for extremely critical applications. Monitoring the vacuum between both Hastelloy®-C4 shells allows detecting a breach of one shell and safely shut down the pump to avoid further damage and leakage to the atmosphere.

Two options to monitor the vacuum between both shells
(right) is an electronic pressure transmitter
CDS-System (left) is a mechanical pressure transmitter

Back to Top ↑

Balanced Thrust Loads
The advanced hydraulic design reduces journal bearing loads to a minimum, to guarantee many years of maintenance-free operation.

Back to Top ↑

Heating & Cooling
Optional jacketing of hydraulic casing and/or lantern allows heating or cooling of your pump. Insulation can be added to
better maintain the desired temperature and reduce energy costs.

Back to Top ↑

Rub Rings Protect the Isolation Shell
A set of rub rings protects the isolation shell from damage, followed by an undetected bearing failure. In the event of a ball bearing failure, the outer rub ring prevents the outer magnet carrier from contacting the isolation shell. The friction-related increase in horsepower draw can be detected to shut down the pump and avoid further damage. The same system prevents the inner magnet carrier from contacting the isolation shell in the event of a journal bearing failure.

Back to Top ↑

Synchronous Magnetic Drive
The synchronous magnetic coupling transmits torque from the driving outer magnet carrier on the atmospheric side through a static isolation shell to the driven inner magnet carrier inside the pump. The outer magnet carrier is connected to an electric motor – soft start devices are not required. The high performance magnets can be operated at liquid temperatures of up to 840 °F (450 °C) without external cooling. Transmittable horsepower exceeds 700 HP.

Back to Top ↑

Secondary Sealing
In the event of isolation shell damage, the secondary sealing system prevents product from leaking to the atmosphere. A pressure switch and/or liquid sensor can be added to detect the damage and shut down the pump.

Back to Top ↑

Removable Drive Frame
In order to perform maintenance work on the drive frame ball bearings (atmospheric side), the drive frame can be removed from the liquid end of the pump without breaking the process seal.

Back to Top ↑

Self-Venting and Fully Drainable

Internal ports and pathways are designed to make all internal cavities of the pump self-venting and fully drainable.
A flanged drain connection can be added if desired.

Back to Top ↑