Clever diaphragm design makes pumping less stressful

Available through Michael Smith Engineers, Codip pumps incorporate PTFE tubular diaphragms, a unique feature compared with conventional air-operated diaphragm pumps.

A key feature of the Codip pump design is that potential areas of concentrated or localised stress have been eliminated, helping to achieve the important benefits of optimum reliability and minimal maintenance.

The pump is operated by a compressed air supply via an independent automatic air distributor to one side of a flat rubber air diaphragm. This diaphragm is deflected, resulting in displacement of the inert liquid inside the pump casing. As the liquid transmits pressure uniformly to the PTFE diaphragm, without any mechanical stress, long tubular diaphragm life is assured. Also, the pumps are secondary contained because the PTFE diaphragm is surrounded by an inert liquid which is sealed in place by the air diaphragm and this guarantees zero leakage.

The absence of mechanical seals, packing or 0 rings means that the pumped liquid is effectively sealed from the environment. As a result many Codip pumps are successfully deployed in handling ultra-pure products in the pharmaceutical industry.

With small modifications the pumps can handle liquids containing solids or particles of up to 7mm diameter, to concentrations of 50%. The range covers flow rates from 0 to 300 lit/mm at discharge pressures up to 10 bar. Standard pumps can handle fluids with temperatures.