Dosing Pumps
Dosing pumps are specialized pumping units designed for volumetric dosing under pressure of various clean, chemically neutral, aggressive or toxic liquids as well as emulsions and suspensions.
Popularity of dosing units is due to the generally accepted technology of water purification. For example, neither coagulation nor flotation, nor disinfection, nor correction of the chemical composition of treated water or other liquid can do without introducing reagent solutions into it. The main factor in chemical water treatment with reagents is accuracy of their dosing.
The first dosing pumps became piston pumps because they had three fundamental advantages:
- high dosing accuracy of pumped water or other liquid.
- small working volume of the pressure chamber. This reduces losses of expensive chemical reagents when dosing them, and in addition makes it possible to manufacture the body of the injection chamber from corrosion-resistant materials that can withstand contact with almost any aggressive medium with negligible rise in price.
- possibility of increasing or decreasing the working volume of the pressure chamber by length adjusting of piston stroke.
The wide range of applications for dosing pumps has led to a real burst of ideas in the minds of designers which could not but lead to appearance of dosing pumps of various types, capacities and modifications. However, for all the variety of types all dosing pumps are usually classified in two ways:
Depending on piston design:
- plunger;
- diaphragm or membrane.
Depending on drive type:
- power driven pumps;
- hydraulically activated pumps.
