To take advantage of PUR materials, manufacturing conditions need to be optimized. The process of mixing base components and additives is critical for product quality.

The contribution made by KRAL pumps with magnetic coupling can be crucial here.

Your advantages:

• Carefree-pump, as discharge, transfer or priming pump.
• Avoid damage of the mechanical seal by fillers.
• No damage of the mechanical seal or O-Ring by urea crystals.
• Media-protecting transport without pulsation.
• No blistering at the finished PUR-products.
• Automated, complete venting of the vertically positioned pump.

When temperatures of up to 480 °F or a hermetic seal of the pump against the environment are required, then the KRAL pumps with magnetic coupling are the right choice. The liquid pumped has no air contact and is protected against crystallization.

A proven, cost-saving construction.

When pumps with conventional sealing systems are not sufficient, KRAL pumps with magnetic coupling come to the rescue. In place of a mechanical seal, a hermetically sealed containment can of stainless steel provides the sealing of the pump from the atmosphere. The torque of the electric motor is transferred by the magnetic coupling to the pump without direct contact.

Your Advantages:

• Leak-free - no leakage or reaction of raw materials.
• No wear and tear - no maintenance
• Hermetically sealed - prevents contact of the PUR components with oxygen.
• Temperature resistant up to 480 °F.
• High flow capability.

Note:
KRAL offers PUR equipment, components and raw materials manufacturers also solutions for an exact flow measurement for PUR components.      

KRAL pumps deliver PUR-Components with optimum efficiency and safety. They pump polyol effortlessly and provide for controlled conditions. In the case of delivery from polyol without fillers the cost-saving KRAL pump of the series K or M with mechanical seal is sufficient.

Due to the screw pump theory neither turbulence nor compression occur during transfer. This ensures that the physical components of the PUR raw materials remain unchanged and the chemical reaction responds to defined set conditions. The temperature of the components and viscosity remain constant. 

Your Advantages:

• Pulse free gentle handling of the fluid. No damage to the polymer threads.
• Operation at full motor speed.
• Vertical assembly available.
• Special solutions for raw material producers, machine builders and component producers.

Note:
KRAL offers PUR equipment, components and raw materials manufacturers also solutions for an exact flow measurement for PUR components.      

Fillers are increasingly being added to polyurethane and fillers are often abrasive. Fillers bring different values to the PUR properties; fillers are used to reduce combustion and provide better insulating values, and increase strength of the final product.

Abrasive fillers accelerate wear on the mechanical seal, spindles, and the casing of standard pumps.  KRAL recommends the magnetic coupling pump with hardened spindles and pump casings. After consulting with KRAL, the pump design can be planned according to user specification.

Your Advantages:

• Pulse free gentle handling of the fluid.
• No damage of the polymer threads.
• No replacement of mechanical seals with the magnetic coupling design.
• Polyol and Isocyanate do not come in contact with the atmosphere.
• Hermetically sealed by vacuum designed assembly.
• Vertical assembly available.
• Special solutions for raw material producers, machine builders, and component producers.

Note:
KRAL offers PUR equipment, components and raw materials manufacturers also solutions for an exact flow measurement for PUR components.