PUMPS - TYPES & OPERATION - OTHER TYPES OF ROTARY PUMPS PDF Print E-mail
Written by Norrie   
Saturday, 27 March 2010 14:10
Article Index
PUMPS - TYPES & OPERATION
CENTRIFUGAL PUMPS
Centrifugal Pump: the rotor
Centrifugal Pump: the casing
Prime Movers
CHARACTERISTICS OF CENTRIFUGAL PUMPS
The Valves of a Centrifugal Pump
CENTRIFUGAL PUMP OPERATION
CENTRIFUGAL PUMPS - FLOW & PRESSURE
Cavitation
AIR BINDING IN A CENTRIFUGAL PUMP
POSITIVE DISPLACEMENT PUMPS
OTHER TYPES OF ROTARY PUMPS
RECIPROCATING (PISTON) PUMPS
SINGLE ACTING RECIPROCATING PUMPS
DOUBLE ACTING RECIPROCATING PUMPS
Advantages & Disadvantages of Piston Pumps
All Pages

OTHER TYPES OF ROTARY PUMPS

The following types of pump have similar characteristics to the gear pump and require no further explanation other than the diagrams.

A. 2. THE ' LOBE ' PUMP
A. 3. THE ' SLIDING VANE ' PUMP
A. 4. THE 'SCREW' PUMP


(See Figures : 26, 27 & 28)


Figure: 26 - Lobe Pump


Figure: 27 -Sliding Vane Pump


Figure : 28 – The Screw Pump

Advantages of Rotary Pumps

  • They can deliver liquid to high pressures.
  • Self - priming.
  • Give a relatively smooth output, (especially at high speed).
  • Positive Acting.
  • Can pump viscous liquids.

Disadvantages of Rotary Pumps

  • More expensive than centrifugal pumps.
  • Should not be used for fluids containing suspended solids.
  • Excessive wear if not pumping viscous material.
  • Must NEVER be used with the discharge closed.


Last Updated on Saturday, 27 March 2010 15:27