Positive Displacement Pumps Flashcards
How is volumetric efficiency calculated for a positive displacement pump?
VE = (actual volumetric output/theoretical volumetric output) x 100
Name the two main categories of positive displacement pumps:
reciprocating pumps, rotary pumps
What are the different types of rotors that may be used in rotary positive displacement pumps?
gears, vanes, lobes, screws, or pistons
What is another name for a progressive cavity pump or a flexible tube pump?
peristaltic type pump
What are the 3 sub-categories of reciprocating pumps?
piston pumps, plunger pumps, diaphragm pumps
What are reciprocating pumps used for?
high pressure, controlled flow, and metering purposes
What can be changed in some reciprocating pumps to determine the flow?
speed and/or stroke
What are 4 advantages of a diaphragm pump?
product is sealed (food industry), easy to repair, self priming, can run dry
How many times will fluid be delivered from a double acting duplex pump per revolution?
4
What helps keep the prime in pumps that have a suction lift?
a foot valve
What determines that maximum discharge pressure of an air powered diaphragm pump?
The input air pressure (usually plant air pressure)
What pump has an elliptical housing?
a balance vane pump
What type of pump has a divider between the discharge and inlet ports?
flexible line pump
