Intro4u2u

Centrifugal Pumps
Centrifugal Pumps are the most common and well-established pumps on the market. They come in many different models and can transfer fluids with high efficiency over a wide range of flows and pressures. With more than 70 years in the Centrifugal Pump business, Johnson Pump offers several series of centrifugal pumps, many of which comply with ISO, DIN and API standards.
Application field
Centrifugal pumps have a large application field and among Johnson Pump’s most important segments can be mentioned:
• Industry
For all types of applications demanding standardised, DIN-normed pumps
• Hygienic
For Food, Pharmaceuticals and Biotechnology
• Water handling
For irrigation, drainage and fresh water
• Chemical/petrochemical
For transport of slightly contaminated thin liquids
• Greenhouse
For heating, distribution of artificial fertilisers, irrigation and drainage
• Marine
For bilge pumping, engine cooling and as
ballast pumps

The Johnson Pump centrifugal pump programme

Single Stage Pumps: Vertical or Horizontal, In Line, Self-priming

Multistage Pumps: Vertical or Horizontal

Magnetic Drive Pumps

Hygienic Pumps

Positive Tutorial

Positive Displacement Pumps are classified into two general categories and then subdivided into four/five categories each:
POSITIVE DISPLACEMENT PUMPS

SINGLE ROTOR

MULTIPLE ROTOR

VANE
PISTON
FLEXIBLE MEMBER
SINGLE SCREW
PROGRESSING CAVITY

GEAR
LOBE
CIRCUMFERENTIAL PISTON
MULTIPLE SCREW

* SINGLE ROTOR
o VANE – The vane(s) may be blades, buckets, rollers or slippers which cooperate with a dam to draw fluid into and out of the pump chamber.
o PISTON – Fluid is drawn in and out of the pump chamber by a piston(s) reciprocating within a cylinder(s) and operating port valves.
o FLEXIBLE MEMBER – Pumping and sealing depends on the elasticity of a flexible member(s) which may be a tube, vane or a liner.
o SINGLE SCREW – Fluid is carried between rotor screw threads as they mesh with internal threads on the stator.
o Progressing Cavity – Fluid is carried between a rotor and flexible stator.

* MULTIPLE ROTOR
o GEAR – Fluid is carried between gear teeth and is expelled by the meshing of the gears which cooperate to provide continuous sealing between the pump inlet and outlet.
o LOBE – Fluid is carried between rotor lobes which cooperate to provide continuous sealing between the pump inlet and outlet.
o CIRCUMFERENTIAL PISTON – Fluid is carried in spaces between piston surfaces not requiring contacts between rotor surfaces.
o MULTIPLE SCREW – Fluid is carried between rotor screw threads as they mesh.