Codip tubular diaphragm pumps

09.07.2002

Fluids handling applications which involve aggressive or abrasive media present tough challenges for pumps.Also, in certain designs of pumps, areas of stress can be concentrated or localised, resulting in premature seal and diaphragm failures.

To meet these challenges liquids handling specialists Michael Smith Engineers has introduced the Codip range of tubular diaphragm pumps which are engineered to withstand the effects of viscous, abrasive and corrosive fluids, even at high temperatures.

Codip pumps combine the benefits of hydraulic actuation with the versatility of air operation, plus the advantage of double containment.Double containment is an important feature of the tubular diaphragm concept because it addresses the growing demand for sealless pumps and ensures zero leakage in the event of diaphragm failure.

Codip pumps function without any mechanical linkage, electric motor or mechanical seal. They operate using an external automatic air valve which directs air pressure to the rear of a flexible rubber diaphragm, while an inert liquid transmits this pressure uniformly to the tubular diaphragm and through to the process liquid. This unique design eliminates the potential stress points which are associated with conventional mechanically actuated double diaphragm and peristaltic pumps and so minimises down-time and maintenance costs. The Codip range comprises five models, which cover flow rates from 20 to 300 litre/min with heads of 10bar at temperatures up to 180C.

Other features of the pumps include:

  • pure hydrostatically pressed PTFE wetted parts which are guaranteed against permeation for all corrosive chemicals and blends
  • dry self-priming
  • run dry capability and
  • dead heading without damage and an elastomeric air membrane which eliminates the need for complex hydraulic systems.

Among the material options available are Viton, Hypalon, EPDM or Neoprene construction for extremely abrasive or corrosive liquids. An electronic or electropneumatic leak detection system, (IP55 or explosion proof zone 1 and zone 0), can also be provided. As well as their suitability for applications involving corrosive liquids and solvents, Codip PTFE tubular diaphragm pumps are also suited to handling ultrapure media in pharmaceutical applications in addition to paints, varnishes, glues, inks and resins. The rubber tubular diaphragm version is more suited to handling liquids and slurries with abrasive solids in suspension.

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