- Output range 1.0 - 30.6 l/h, 10 - 2 bar
- Stroke length adjustment in steps of 10% from 0 - 100 %
- Material versions PVDF and Acrylic/PVC
- Patented coarse / fine bleed valve
- Constant stroke rate
- Control via mains supply ON/OFF
It is ideal for continuous metering.
It is an oscillating motor diaphragm metering pump for liquid chemicals and consists of drive and delivery unit as main components. The drives are available in 2 gear ratios, delivery units in 4 sizes and in the materials acrylic/PVC. It is therefore possible to specify the required output and the material combination.
The alpha pumps are switched on/off via the mains power supply, the metering output can be changed via the stroke length adjustment between 100 % and 0.
The drive consists of a powerful split pole motor with gearbox, eccentric shaft and connecting rod as driving rod. The housing is made of glass fibre reinforced plastic and is resistant to shock and chemicals.
The eccentric for the stroke movement is guided in an eccentric cam. Suction and pressure stroke are positively driven.
The stroke length adjustment is carried out by varying the eccentricity in 10 % steps via a notched slide when the pump is not working. This means that the diaphragm deflection is always made from the neutral centre position.
During operation, the alpha pump with its positively driven suction and metering strokes as well as the stroke length adjustment by varying the eccentricity produces a smooth, sinusoidal stroke action for suction and metering stroke with diaphragm deflection from the centre position.
The result is good suction performance, smooth metering stroke and consistently accurate metering with low mechanical load on the metering diaphragm.
The delivery unit consists of liquid end, metering diaphragm and head disc. The liquid end in the material combinations PVDF or plexiglass / PVC is equipped with double ball valves on the suction and pressure side as well as coarse/fine bleeding.
The bleed valve facilitates suctioning and bleeding at full operating pressure without having to interrupt and de-pressurise the metering line. For media of higher viscosity, the valves can be spring-loaded.