Self-priming three-screw type of pump with internal bearing. The hardened and ground screws run in an exchangeable casing insert.
The driving screw is hydraulically balanced. The axial thrust of the working screw is absorbed by the endside pump cover Their drive is hydraulic.
The thread flanks merely transmit the torque resulting form the liquid friction. Thus,the thread flanks are practically stress-free and not subject to any wear. All sliding parts are lubricated by the delivery medium being within the range of full liquid friction.
The radial and axial bearing of the driving screw is by the balancing piston guided in the bearing ring.Simultaneously, the gap between balancing piston and bearing rings separates the pressure chamber from the sealing chamber. A maintenance-free mechanical is provided as the shaft sealing.
Sealing chamber and suction chamber are interconnected by way of a return gallery. Thus, independently of the delivery pressure at the shaft sealing ,only the suction pressure becomes effective.
Complete units being supplied, the connection pump/driving motor is by a pump connector with bracket(sizes 20) or by a wall/foot bracket resp. (size 40)
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