The new 5 & 7 models extend the range of Verderflex Dura peristaltic pumps with two new high pressure low volume hose dosing models for handling less than 1 l/hr at 5 or 8 bar with a rugged (re-enforced) hose. The range now boasts dosing/transfer rates of up to 12 m3 p/h.

The new Dura pumps feature an internal hose diameter of 5 mm and 7 mm respectively. The range as a whole has been specifically designed for the handling of slurry and sludge like fluids such as those found in the treatment of wastewater, additives in to food and beverage mixing, pigments and inks.

Key applications include
• Dosing of lime and other chemical solutions in the treatment of wastewater and sewage.
• Dosing of sodium hypochlorite for bacterial remediation.
• Acidity control/pH buffering
• Delivery of pigment solution in manufacturing

The Dura can handle gaseous fluids such as sodium hypochlorite solution which may cause air-locks or jamming in metering pumps. The peristaltic working principle simply draws and pushes the composition regardless. Many organizations set the pump to ‘over-dose’ to allow for the off-gassing effect which increases chemical costs. The Verderflex Dura provides consistent and reliable delivery and cost of water treatment chemical.

The peristaltic principle also minimizes abrasive wear from slurry-type fluids by the central rotor turning and compressing a hose and displacing fluid the fluid. As no moving parts come into contact with the hose there is no abrasive wear.

The internal hose provides an open flowpath which prevents clogging where there are viscosity changes or crystallization of reagents. As the hose compressing and relaxing is the only ‘action’ in conjunction with the rotor, the pump can truly self-prime and run-dry up to 9.5m compared to below 5m wet-primed lifts associated with diaphragm pumps. The Dura peristaltic pump eliminate the need for pre-wetting and priming in lower volume dosing applications.

When a chemical flow is interrupted, the reagent may suffer crystallization, causing a blockage, particularly in metering pumps. The rotor and hose positive displacement of a peristaltic pump allows any blockages to be solved through reversing the action of the pump.