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TYPES OF ROTARY PUMPS ( PROGRESSIVE CAVITY PUMP, PERIPHERAL PUMP, SCREW PUMP)
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- A progressive cavity pump consists of only one basic moving part, which is the driven metal rotor rotating within an elastomer-lined (elastic) stator.
- As the rotor turns, chambers are formed between the rotor and stator. These chambers progress axially from the suction to the discharge end, moving the fluid. By increasing the pitch of the rotor and stator, additional chambers or stages are formed.
- The Vane pumps are solutions to the special pumping problems of municipal and industrial wastewater and waste processing operations. Industries, such as, chemical, petrochemical, food, paper and pulp, construction, mining, cosmetic, and industrial finishing, find these pumps are ideally suited for pumping fluids with nonabrasive material inclusion.
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PERIPHERAL PUMP
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- the impeller has a large number of small radial vanes on both of its sides.
- The impeller runs in a concentric circular casing. Interaction between the casing and the vanes creates a vortex in the spaces between the vanes and the casing, and the mechanical energy is transmitted to the pumped liquid.
- Peripheral pumps are relatively inefficient and have poor self-priming capability. They can handle large amounts of entrained gas. They are suitable to low flow and high pressure applications with clean liquids.
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SCREW PUMP
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- In addition to the previously described pumps based on the Archimedes’ screw, there are pumps fitted with two or three spindles crews housed in a casing.
- Three-spindle screw pumps, are ideally suited for a variety of marine and offshore applications such as fuel-injection, oil burners, boosting, hydraulics, fuel, lubrication, circulating, feed, and many more.
- The pumps deliver pulsation free flow and operate with low noise levels. These pumps are self-priming with good efficiency. These pumps are also ideal for highly viscous liquids.
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