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Rotary and Centrifugal Pumps (Copyright Viking Pump, Inc.)
Comparing Rotary & Centrifugal Principles. Rotary & Centrifugal Pumps. Rotary pumps operate in a circular motion and displace a constant amount of liquid with each revolution of the pump shaft. In general, this is accomplished by pumping elements (e.g., gears, lobes, vanes, screws) moving...
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Adjustable Speed Drives as Applied to Centrifugal Pumps
control has used valves; which increase system pressure, inherently waste energy, and generally cause the pump to operate at reduced efficiencies. d7737.qxd Adjustable Speed Drives As. Applied To Centrifugal Pumps. Application Solution. Foreword. This article is a revised edition of the original...
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When to Use PD Pumps (Copyright Viking Pump, Inc.)
When to use a centrifugal or a Positive Displacement pump ("PD Pump") is not always a clear choice. To make a good choice between these pump types it is important to understand that these two types of pumps behave very differently. Flow rate versus pressure By looking at the performance chart...
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Vane Pumps (Copyright Viking Pump, Inc.)
arrow) and fluid enters the pump, centrifugal force, hydraulic pressure, and/or pushrods push the vanes to the walls of the housing. The tight seal among the vanes, rotor, cam, and sideplate is the key to the good suction characteristics common to the vane pumping principle. 2. The housing...
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Vacuum pumps
chambers. Lobed-rotor pumps bridge the gap between positive and nonpositive-displacement units. The pumps have a pair of mating lobed impellers that rotate in opposite directions, trapping air and withdrawing it from the system. High-speed, multistaged centrifugal blowers and regenerative blowers...
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Preface - Pump Handbook
; Screw Pumps; Vane, Gear, and Lobe Pumps; Electric Motors and Motor Controls; Permanent Magnet Adjustable Speed Drives; Variable Speed Fluid Drives; Gears; Pump Couplings; Centrifugal Pump Mechanical Seals; Drainage and Irrigation; Metallic Materials and Damage Mechanisms; Pulp and Paper Mills; Heating...
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Liquid Containment (Copyright Viking Pump, Inc.)
thus far focused on centrifugal pump principles because their numbers dominate the market. Positive-displacement (PD) pumps may pose special sealing problems because they have been designed to handle viscous, non-Newtonian, or other problem fluids under a wide range of physical conditions. Many...
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Vacuum and Pressure Handbook: Vacuum Pumps
and low flow. rates. The principle types of nonpositive displacement vacuum pumps are the centrifugal,. axial-flow, and regenerative designs. Single-stage regenerative blowers can provide vacu-. ums up to 7 in. Hg with flows to several hundred cfm. Vacuum capabilities of the other. designs are lower...
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Sizing a Pump Should Be Easier than Reading Greek
myths about. · Where is fluid being moved to and from?. pumps. In reality, pumps use energy and push fluid. · How much fluid has to be moved and at what rate? from Point A to Point B. The most common type. 18 Utility Contractor | January 2012. of pump -- the centrifugal --. relies on the rotary...
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Pump Control with Variable Frequency Drives (.pdf)
improvements. Curves determine centrifugal pump efficiency. In-line valves are often used to regulate flow or pressure in liquid pumping systems. The valve can be a significant source of. energy loss by causing a restriction in the flow path, thus increasing the pressure. An AC drive provides more...