Grundfos Vertical Multistage Water Pumps
Vertical multi-stage pumps are types of centrifugal pumps that draw liquid through the device and pressurise it by means of rotating vane impeller. Liquid enters through the suction port to the centre of the first impeller. It is directed along a vertical pump shaft through a maximum of three successive impellers- the multiple stages – until it reaches the discharge port. This design of pump can also be made with a horizontal pump shaft. The advantage of this type of pump is that it's self-priming and does not produce pressure pulsations. The pumps can also work in high and low pressures. They are very versatile devices and can be used in a variety of industrial and commercial applications:
The Lowara e-SV stainless steel vertical multi-stage pump has a liquid delivery capacity of up to 160 cubic metres per hour and a maximum head of 330 metres. It has silicon carbide / tungsten carbide bush bearings to withstand heavy duty applications. It works with pumped liquids temperatures between -30 degrees C and + 120 degrees C with a high temperature option design available to +150 degrees C. This pump will also work to pressures as high as 40 bar.
The Armstrong Series 4700 of vertical multi-stage pumps are similarly designed to work with pumped liquid temperatures of between -15 degrees C and +150 degrees C and over a pressure range of 0.3 to 30 bar. This pump's main application has been in water treatment plants, as well as the feeding of water to machine tools, grease removal and lathe cooling.