Pumps flexible vane

Flexible impeller pump (Figure Hf) uses elastomeric material such as rubber as rotor. Its impellers or vanes continuously deflect or straighten as they pass a cam between the inlet and outlet ports. Liquid is carried and compressed by the flexible impellers from pump Inlet to outlet. Its advantages are it is an inexpensive pump. It can handle liquid with solids, abrasives, or entrained gases. It is dry seif-priming, its disadvantages are its low flow and pressure limits, about 150 gpm and 6D psi. It cannot run dry and its operating temperature is limited to about 300 F,... 

---