Low volume dosing pumps

Here, Paul Dale, marketing manager, details some of the key features.  

•  Carefree pumping of off gassing liquids: Sodium hypochlorite ('Hypo') can be used to disinfect drinking water, and the food industry uses it to prevent bacterial contamination. When pumped, Hypo off gases, vapour locking a diaphragm pump’s chamber resulting in additional degassing valves. Often pumps are set to 'over-dose' to compensate for the loss of performance leading to increased chemical usage. Hose pumps offer a solution and address the associated crystallisation issues.

•  Eliminate abrasive wear costs: Lime is a common pH adjustment chemical, used in water treatment, industrial waste remediation and process acidity control. Its fine particles are highly abrasive and cause severe stator and valve wear resulting in high pump ownership costs. Verderflex has many years experience solving this pumping problem and peristaltic pumps are accepted as a valve-free solution to pump lime. The Dura 5 & 7 now bring this performance to lower flow rates.

•  Reduced chemical usage: Peristaltic pumps have a gentle, low shear pumping action that maintain particle size and reduce the flocculation chemical volumes.

•  Kill clogging costs: The Dura 5 & 7 use re-enforced hoses to generate powerful suction eliminating both the performance variability caused by minor viscosity fluctuations and the consequential clogging maintenance costs. Additionally, the Dura 5 & 7 allow pumps to run backward and clear blockages.

 •  No tube re-tensioning: Some peristaltic pumps use continuous lengths of non re-enforced tubes which require re-tensioning after initial installation.  The long life heavy duty Dura 5 & 7 hoses are fit-and-forget.

 •  True dry priming: Dura 5 and Dura 7 dry prime to 9.5m of water. They eliminate the need for pre-wetting and priming in lower volume chemical feed systems.

 •  Stable liquid delivery: Some metering pumps lose accuracy when flow rates or system pressures change, however, the Dura 5 & 7 hoses give consistent dosing accuracy even under varying operating conditions.

•  Secondary containment: The pumped liquid is totally contained inside the Dura 5 & 7’s high pressure hose and each hose is totally contained inside the pump casing.  This results in efficient secondary containment, allows pre-spillage detection and may eliminate special spillage bunds.

 •  Safe and secure clamping: The re-enforced hose has a burst pressure in excess of 80 Bar (1150 PSI) and there is a high compression taper fit clamping system.

•  Viscous performance: The Dura 5 and Dura 7's re-enforced hoses give problem-free pumping of 1000 CPS plus liquids and eliminate flow fluctuations without requiring additional parts.

 •  Maintenance: Only the easy-to-change hose is in contact with the pumped liquid. Downtime is minimised with infrequent servicing and hose life in the thousands of hours. Simple on site changeovers can be made by semi-skilled staff, lowering the total metering solution ownership cost.

•  User controls: Dura 5 & 7 pumps can be remotely controlled by inverters. These can be the familiar site standard brand, further simplifying the control system support requirements.

 •  Scalable performance: The Dura 5 and 7 have the same common casing and mounting frames as the Dura 10. Should system demands change, flow rates are easily scaled up on site or down by replacing the hose and a few standard components.