Pumps external gear

One of the most common rotary pumps is the external gear pump illustrated in Figure 4.11. The fixed casing contains two meshing gears of equal size. The driving gear is coupled to the drive shaft which transmits... 

Figure 7.4. Performance of several kinds of pumps, (a) Comparison of small centrifugal and turbine pumps (Krista and Annett, 1940). (b) An axial flow pump operating at 880 rpm (Chem. Eng. Handbook, 1973). (c) An external gear pump like that of Figure 7.12(e) (Viking Pump Co.), (d) A screw-type positive displacement pump, (e) NPSH of reciprocating positive displacement pumps.

A pilot plant scale starch solution, approximately 300 l, was prepared in a stainless steel container equipped with a paddle wheel electric stirrer, steam-heated coils, steam injection, an external gear pump with recirculation capability, insulation surrounding the container, a container lid, and a vent. The starch solution was prepared with the same percentage composition and duration of heating as described for the laboratory scale process. The first batch was pimped into the "sizing box" of the slasher and utilized immediately hot as a conventional yarn treatment. 

External Gear Pump Sliding Vane Pump... 

Figure 13.6 Gear pump versions (a) external gear pump (b) clearance situation (c) internal gear pump (d) trochoidal pump E inlet A outlet channel S clearance channels source Institute of Process Machinery and Systems Engineering, University of Erlangen-Nuremberg, Germany).

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