Viking Pump's rotary positive displacement pumps, using gear and lobe principles, offer an alternative to centrifugal pumps in applications where system pressure or fluid viscosity fluctuates. Compared with centrifugal pumps where flow rates often change and efficiency is lost, Viking positive displacement pumps provide a near-constant flow rate with minimal efficiency change, regardless of changes in system pressure or viscosity. High NPSHR capabilities keep fluid moving with less chance of cavitation in processes where a suction lift is required or where a high vapor pressure fluid is being pumped. These pumps can handle fluids from 28 to 2,000,000 SSU (1-440,000 cSt) viscosity. They also feature low shear, reversible direction of flow, low pulsation, and high mechanical efficiency.
Available in internal or external gear styles, Viking's gear pumps use a drive gear and driven gear that unmesh to draw fluid in and remesh to force fluid out. This line of internal gear pumps comes in stainless steel, steel, or iron, with capacities from 1.5 to 1,500 gpm (0.3 to 340 cubic meters/hour) at pressures to 250 psi (17 bar). For hazardous fluids and zero-emission applications, Viking Mag Drive sealless internal or external gear pumps eliminate shaft leakage completely.
Viking's rotary lobe pumps employ non-contacting lobes in bi-wing and multilobe designs. These pumps consist of both sanitary/hygienic and industrial models suitable for lower-shear or higher-pressure applications where cleanability or periodic dry-running is required. Constructed of stainless steel, the lobe pumps offer capacities to 820 gpm (184 cubic meters/hour) at pressures to 400 psi (27 bar). For full details, contact Viking, 406 State St, Cedar Falls IA 50613-0008.