New goods. New services. Armfield, Ltd. http://1411.uk.all.biz Sat, 25 Feb 2012 11:20:27 +0200 http://www.all.biz/img/logo.gif http://1411.uk.all.biz http://www.uk.all.biz/g809/ The centrifugal pump is the machine most commonly used to move liquids from one place to another. As such it is a particularly instructive unit with which to introduce students to the whole subject of rotodynamic fluid machines. Discovering the relationship between head, flow, rotational speed and power provides a framework of general applicability. For example, matching the required duty point to the conditions of maximum energy efficiency may be explored as a creative student project.]]> Fri, 27 Apr 2007 00:00:00 +0300 http://www.uk.all.biz/g809/ http://www.uk.all.biz/g811/ The gear pump is the most widely used of the positive action rotary pumps. Two gear wheels operate inside a casing. One is driven whilst the other rotates in mesh with it. The liquid is carried around in the space between consecutive teeth and then ejected as the teeth mesh. The pump has no valves. It is a positive displacement pump and will deliver against high pressures. The output is a more even flow than that of a reciprocating pump. It is particularly suitable for high viscosity fluids.]]> Fri, 27 Apr 2007 00:00:00 +0300 http://www.uk.all.biz/g811/ http://www.uk.all.biz/g813/ Centrifugal pumps are often used together to enhance either the flow rate or the delivery pressure beyond that available from the single pump. The unit is designed to demonstrate the operational advantages of parallel or series operation, depending on the required duty.]]> Fri, 27 Apr 2007 00:00:00 +0300 http://www.uk.all.biz/g813/