KRAL pumps are also available with magnetic seals. Magnetic coupled pumps from KRAL are maintenance free, hermetically sealed and can be used at temperatures of up to 300 °C. Additionally, the lifespan of the ball bearings is considerably extended.

Leakage-free and clean.
Critical fluids containing substances endangering the health or the environment should not leak to the atmosphere. Conventional shaft seals are lubricated by the fluid. A leakage flow is specified and necessary for proper operation. Magnetic couplings replace conventional shaft seals. KRAL three screw pumps with magnetic coupling are hermetically sealed; the environment remains clean.

Can be used to 300 °C.
Thermal distortion and the temperature limits of elastomeric sealing elements restrict the use of three screw pumps in high temperature applications. If temperatures up to 300 °C are handled, KRAL three screw pumps with magnetic coupling are the right choice.

Reduced life cycle costs.
Spare parts and maintenance costs of mechanical seals increase lifecycle costs. The use of high quality mechanical seals in KRAL three screw pumps is the standard. Even when properly applied, mechanical seals are subject to wear. Spare parts and maintenance costs arise. KRAL magnetic couplings are maintenance free, due to the lack of a mechanical seal and increased life of the ball bearing. The cost premium of a three screw pump with a magnetic coupling will be typically amortized after only three years of operation.

Protection of delivery medium.
With conventional seals, oxygen from the atmosphere may diffuse through the sealing gap into the fluid. When the fluid crystallizes from contact with oxygen, the process is interrupted and expensive plant shut downs can result. KRAL three screw pumps with magnetic coupling are hermetically sealed and protect the integrity of the fluid.

Low price.
A magnetic coupling is required to transmit high torques. This can make the magnetic coupling large and expensive. For high torque transmission, strong magnets are necessary. The new generation of KRAL three screw pumps are cost optimized and designed to the requirements of the magnetic coupling. For many years, KRAL has successfully manufactured magnetic coupled three screw pumps. Experiences and actual field tested applications were incorporated in the design.

Overload protection.
If the operating limits are exceeded, the three screw pump may become damaged. Solids in the fluid can lead to blockade and damage the spindle and the housing. In most cases the product produced is not to specification, and the three screw pump must be replaced. If the decoupling is controlled, and the three screw pump stops, the three screw pump and magnetic coupling will suffer no damage. The magnetic coupling can prevent consequential damage.

Your advantages:



• Leak-free - no collection of residues.
• Extremely low maintenance.
• Hermetically sealed - prevents contact with oxygen of the heavy fuel oil, isocyanates,
       and other reactive liquids.
• Operating temperatures up to 300 °C.
• High flow and pressure capability.