Gerotor Pair
The gerotor pump includes a gerotor pair (screw pair). The gerotor pair consists of a metal rotor and a rubber stator in a casing.
When the rotor rotates inside the stator, the mixture moves along the spiral channel of the stator. The rotation centers of the stator and rotor are offset by the eccentricity value, which creates a friction pair with closed cavities along the entire length of rotor rotation. The number of closed cavities determines the final mixture pressure, and the volume of all cavities affects pump capacity.
There are 4 types of gerotor pairs:
| Type S | Type L |
|---|---|
| Performance level 100%, differential pressure 12 bar | Performance level 200%, differential pressure 6 bar |
| Type D Performance level 150%, differential pressure 12 bar | Type P Performance level 300%, differential pressure 6 bar |
Our gerotor pumps most commonly use Estrichstar gerotor pairs manufactured by M-tec, Germany. They have proven to be very reliable and productive.
The stator is made in a metal split casing that needs to be tightened as the inner surface of the stator wears.
The service life of the stator on our units when pumping polystyrene concrete is about 5,000 m³, the rotor — 20,000 m³.