Classification of pumps
The classification used in this guide first considers the principle by which energy is added to the fluid , i.e. by dynamic action or by displacement , and then identifies different pump geometries by which this principle is implemented. This approach therefore relates the classification to the pump itself and not to liquids handled, materials of construction , method of drive , or shaft orientation.
All pumps are divided into the two major categories of rotodynamic and positive displacement. Minor categories are excluded. All the rotodynamic pumps shown are centrifugal. Positive displacement pumps are essentially divided into reciprocating and rotary types , depending on the nature of movement of the pressure-producing members . Each of these major clas sifications is subdivided into several specific types of commercial importance, see Figure 4.1, p.16.1