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MKNS series Lined Magnetic Drive Pumps are designed as per ISO 2858 standard with PFA-P linings. PFA-P linings give improved corrosion resistance as compared to high alloy, expensive metals magnetic drive pumps.
PFA-P stands for Perfluoroalkoxy – Permeation Grade. PFA-P is processed in a transfer moulding operation and as a result the lining wall thicknesses can be accurately defined and reproduced. Thanks to its dense molecular structure, PFA-P has generally much lower permeation rates than PTFE with the same wall thicknesses, but it has the same chemical and thermal resistance properties. PFA-P is justifiably the material of first choice in applications with media which especially tend to permeate, such as chlorine, bromine or fluorine compounds.
If the chemical penetrates the lining, this may cause corrosion on the pressure-bearing metal body and perhaps even failure of the unit. MKNS Lined Magnetic Drive Pumps have PFA-P lining thickness to 6-9 mm, lining locked by multiple locking grooves, producing substantially longer service lives.
Magnetic Drive Pump Overviwe
In a standard centrifugal pump, the power is delivered to the pump end either through a direct connection between the rotating element and the motor shaft or through a coupling between the pump end shaft and the motor shaft.
In these cases, the pumping chamber needs to be sealed from the outside. Traditionally, packing or some other sort of mechanical seal accomplishes this.
The principle of a magnetic drive pump is that the rotation from the motor shaft is transferred to the pump end via a magnetic coupling which eliminates the need for the shaft seal or packing.
A drive magnet is mounted to the motor shaft, which transfers the motor torque through a sealed housing to an internal driven magnet. The driven magnet is coupled directly to the impeller. This configuration is categorized as seal-less.
The following will give an idea of approximate leakage rate for various Sealing arrangements:
Gland Packing - >1000 ppm
Single Mechanical Seal - 10 - 1000 ppm
Double Mechanical Seal - <10 ppm
Sealless - 0 ppm