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	Gear Pump Miniature Gear Pump External Spur Gear Pump
		As the driving gear engages the driven gear, the fluid coming in from the inlet port is transferred via the outside of the gears between the teeth and the pump casing or housing, and then forced out under pressure into the outlet port of the pump.
		Gear pumps are normally used in applications with low to medium pressure output such as 2500-4000 psi.
		While the driving gear rotates at 1750-3450 rpm, the gear pump is relatively quiet as the gears are supported by bushings or journal bearings on both sides.
	www.suwaprecision.com /gears/gear_pump.html (383 words)

	Gear metering pump for compounded elastomeric material - Patent 5120206
		Gear pumps are generally classified by the services provided, such as metering, pressure boosting and volume transfer, as well as by the materials handled, such as polymers or low viscosity or inviscid liquids.
		Gear pumps designed for polymers, especially gear metering pumps, are difficult to disassemble for cleaning and maintenance because parts must be designed for high strength as well as very tight fit, and usually are held together by the stiff polymer being transferred thereby.
		Gear pump 1 preferably is driven by a usual electric motor 14 having its drive shaft 15 coupled to an input shaft 16 through a drive coupling 17 in a manner well known in the art.
	www.freepatentsonline.com /5120206.html (4889 words)

	Sickleless internal gear pump having sealing elements in tooth heads - Patent 5540573
		Gear pumps of this type additionally have a suction port in the area in which the teeth disengage as the pinion rotates.
		The circumference of the ring gear divides thus into a suction space, in which the pressure medium is by the suction port sucked through the apertures, and in a pressure space, in which the pressure medium is through the apertures forced outward from the interior of the ring gear.
		On the sickleless internal gear pump known from DE 41 04 397 A1, the flank seal of a pinion tooth with the relevant ring gear tooth ends, due to the small number of teeth, far before dead center of the toothing.
	www.freepatentsonline.com /5540573.html (1803 words)

	Maintenanceworld: Gear Pump Operation and Maintenance from Feedforwards
		A gear pump uses two meshing, toothed cogs to force water from the inlet of the pump through to the outlet.
		Gear pumps usually have one shaft penetration through the housing for connection to the drive.
		Gear pumps require good, robust installation, a PRV to protect the pump from overpressure and an assured supply of clean liquid.
	www.maintenanceworld.com /Articles/feedforward/gearpump.htm (937 words)

	Plastic Pump Depot - Plastic Gear Pumps
		A gear pump is a "positive displacement" pump, unlike a centrifugal pump which is a "velocity" type pump.
		As the term suggests, a "velocity" type pump generates pressure and flow from the tangential and angular velocities (kinetic energy) imparted to the liquid by the speed and shape of the impeller.
		Since gear pumps are inherently self priming and their non-pulsating flow does not agitate the liquid, they may be better choices for these applications.
	www.plasticpumpdepot.com /plasticgearpumps.html (656 words)

	Pump, Pumps, Internal Gear Pumps, Hydraulic Gear Pumps, Chemical Gear Pumps, Rotary Gear Systems, Miniature Gear Pumps, ...
		Pumps are usually shipped on their base plates and it is seldom necessary to remove the pump and driver from the base plate while leveling.
		When pumping highly volatile liquid such as butane, propane, hot oils, etc. there must be sufficient static head on the suction in addition to the vapour pressure to prevent vaporization of the liquid within the pump.
		Where the pump is excessively heated in the initial running, and jamming is caused, allow it to cool down to the temperature till the jamming is eliminated.
	www.alfapumpsindia.com /faultfinding.htm (2834 words)

	IDEX Corporation \| Micropump \| Tech Tips \| Gear Pump Repeatability
		A gear pump has three such dynamic sealing areas- (A) the tips of the gear teeth and the cavity wall (either cavity plate or suction shoe), (B) where the gears mesh and close, and (C) the mating surfaces of the gears, the pump body, and the end cap (see Fig.
		Micropump's suction-shoe style gear pumps are pressure loaded, meaning differential pressure on the outlet side of the pump forces the sealing elements (suction shoe, gears, pump body) tighter together, making this type of gear pump more efficient (less slip) at higher differential pressures.
		Pumping mixed phase (fluid/gas) fluids lowers the repeatability of a pump.
	www.micropump.com /tech_tips/gear_pump_repeat.asp (1283 words)

	Gear pump (Site not responding. Last check: 2007-10-21)
		The pump was originally designed and built to meet the water and particle sampling requirements of the ARAMIS project for which the unit needed to be compact and lightweight, suitable for use in medium and small ROV's.
		The pump is compatible with Challenger Oceanic filtration equipment and water samplers and may be used with ion exchange columns.
		The gear pump generates a high pressure head and is designed for moving liquids at high ambient pressure.
	www.challengeroceanic.com /subsystems/pumps/gearpump.htm (153 words)

	Motor-mounted internal gear pump and electronic device patent invention
		[0004] An internal gear pump is composed, as main active components, of an internal rotor having teeth formed around the outer periphery and having a shape of a spur gear and an annular-shaped external rotor having teeth formed around the inner periphery and having a width generally same as that of the internal rotor.
		In this conventional pump, the internal gear pump mechanism are arranged in parallel at the side face of the motor, wherein the internal gear pump mechanism is driven by a driving shaft of the motor.
		In case where the pump is used for an electronic device, in particular, it is important to prevent the leakage of the conveyed liquid, since a small amount of leakage may possibly entail a breakdown of the entire electronic device.
	www.freshpatents.com /Motor-mounted-internal-gear-pump-and-electronic-device-dt20051201ptan20050265860.php (1084 words)

	Automotive hydraulic gear pumps
		VBC GEAR PUMP are available for industrial use in different sizes flow of 1.2 lpm to 6.8 lpm and 7.7 lpm to 40.0 lpm, VBC also make multiple pump and special pumps as per customers requirements.
		The pump may be mounted in any position, The units are supplied with either two or four bolt flanges and with a spigot for location.
		The pumps are designed to operate between 0 and 80 C intermittent temperatures may very between -20 to 100 C if the fluid being pumped is suitable for such operations.
	www.hydraulicgearpump.com /features_of_our_gear_pumps.htm (724 words)

	Dynaflow Engineering, Inc. - Gear Pumps: Mag Drive Gear, Sealed, Metering, Dosing, Chemical
		As the term suggests, a "velocity" type pump generates pressure and flow from the tangential and angular velocities(kinetic energy) imparted to the liquid by the speed and shape of the impeller.
		Our gear pumps incorporate design features that will extend their accuracy, reliability, and maintainability over many years of service.
		Metering with gear pumps can be adjusted by manual and by external means, such as a 4-20 mAmp signal.
	www.dynafloweng.com /gearpumps.html (1185 words)

	PumpBiz : GENERAL PUMP QUESTIONS
		Self-priming pump is one that develops a vacuum sufficiently enough for atmospheric pressure (14.7 psi at sea level) to force the liquid to flow through the suction pipe into the pump casing without priming the pump.
		A self-priming centrifugal pump is especially designed with a large chamber at its discharge side that acts both as an air separator that separates the air from the liquid, and a reservoir that holds residual liquid used for priming or re-priming the pump.
		Pumps of the same NS but of different size are considered to be geometrically similar, one pump being a size-factor of the other.
	www.pumpbiz.com /info/index.cfm?fuseaction=faq (2345 words)

	Metering Pump Technology
		Material is drawn into the pump inlet to be metered by the gear teeth around the inside circumference of the pump.
		The gear teeth carry the material through the pump with the accuracy of volumetric displacement subject to how close tolerance is maintained between the teeth and the inside walls of the pump.
		Both the size of the pump and the rotational speed determine the volume to be discharged subject to any slippage within the pump.
	www.liquidcontrol.com /etoolbox/meteringpump.html (604 words)

	External Gear Pumps
		External gear pumps are a popular pumping principle and are often found in lubrication pumps in machine tools, in fluid power transfer units, and as oil pumps in engines.
		External gear pumps are similar in pumping action to internal gear pumps in that two gears come into and out of mesh to produce flow.
		Because the gears are supported on both sides, external gear pumps are quiet-running and are routinely used for high-pressure applications such as hydraulic applications.
	www.pumpschool.com /principles/external.htm (539 words)

	MG Gear Pump from Clark (Site not responding. Last check: 2007-10-21)
		The MG Gear Pump gears are in PTFE or PEEK.
		In operation, the MG 200 Series gear pumps are noiseless, pulsation-free and capable of handling relatively hot liquids, i.e., 120°C (248°F) at a low coefficient of expansion.
		The principle of the magnet drive comprises an inner PEEK encapsulated magnet embodied in the pump, connected to the driving gear, and an outer magnet connected to the motor shaft.
	www.clarksol.com /html/gear_pump.htm (237 words)

	IDEX Corporation \| Micropump \| Case Studies
		The rotation of the gears (Figure 5) moves the fluid around the cavity wall into the outlet area and passages, where a high pressure area is created as the gear teeth mesh displacing the pumped fluid.
		Gear pumps can be designed to have a long and predictable life as required in electronic cooling applications.
		The gear radial loads are primarily due to the discharge pressure acting on the gear cross-section.
	www.micropump.com /whats_new/case_studies/index.asp (1461 words)

	Hydraulic accessories india hydraulic industrial gear pump
		VBC Gear Pumps are available for industrial use in different size flow of 0.8 lpm to 6.8lpm and 7.7 lpm to 40.00 lpm and upto 225lpm @ 1500 rpm.
		Low pressure bearing lubrication is feature of all VBC Gear Pumps, this is achieved by utilising the action generated when the gear teeth separate to draw lubricating fluid from the inlet port and along each bearing journal by way of passage in the composite bush.
		The pumps are designed to operate between 0° and 80° C intermittent tempearatures may very between -20° to 100° C if the fluid being pumped is suitable for such operations.
	www.vbchyd.com /feature.html (755 words)

	Internal Gear Pumps
		Internal gear pumps are well-suited for a wide range of viscosity applications because of their relatively low speeds.
		For each revolution of an internal gear pump, the gears have a fairly long time to come out of mesh allowing the spaces between gear teeth to completely fill and not cavitate.
		Because internal gear pumps have only two moving parts, they are reliable, simple to operate, and easy to maintain.
	www.pumpschool.com /principles/internal.htm (380 words)

	Spearhaed November
		The fluid fills the interstices of the gear teeth and is conveyed like a waterwheel circumferencially between the gear and the pump housing.
		The output from a pump with large clearances is affected by the differential pressure across the pump and the ability therefore to accurately meter resin output is not good.
		Pumps are specified as to their volumetric output per revolution.
	www.spe-ggs.org /spe/html/tech_topics/extrusion/gear_pump.html (648 words)

	oberweb.new2
		Gears are usually the most noticeably worn part of a used gear pump.
		Note that lettering on seal casing must be on outside of pump, garter spring and lip facing the inside of the pump.
		If pump is equipped with a packing type seal (stuffing box), replacement of the two asbestos-graphite rings is done easiest after conclusion of pump assembly.
	www.oberdorfer-pumps.com /Maintenance/RepairKitgear.htm (736 words)

	MG Gear Pump With AC Motor from Clark
		The magnet drive principle provides a totally sealed pump chamber which is capable of handling a wide range of corrosive liquids with a high degree of safety.
		The housing of the pump and the internal metal parts are in AISI 316 stainless steel.
		The principle of the magnet drive comprises an inner magnet embodied in the pump, connected to the driving gear, and an outer magnet connected to the motor shaft.
	www.clarksol.com /html/prodspecsMGGearPumpAC.htm (225 words)

	hydraulic gear pump factory direct from ptohydraulics.com
		Hydraulic gear pumps are used in a wide variety of machines, for example agricultural and construction vehicles, and airplanes, to provide flexible power from the engine to lifting gear or ancillary equipment.
		In this study only features related to the drive gear, the driven gear and the two bearing blocks (known collectively as the gear pack) were varied, and all other features were held constant.
		The clearance is based on the difference between the diameter of the drive shaft and that of the journal bearing into which it fits, the gear form is a function of the profile of the gears, and the side gap corresponds to the size of the gaps between the gears and bearing blocks.
	www.ptohydraulics.com /news/hydraulicgearpump.htm (516 words)

	flow control:metering pump:chemical pump:Chemical Systems [Smart Pump] (Site not responding. Last check: 2007-10-21)
		Chemical Systems Smart Pump Metering Dispense Systems utilize precision grade positive displacement gear pumps as its means from which to meter material.
		The liquid confined in the cavities formed by the gear teeth, gear casing and side plates moves along the internal circumferential of the casing towards the outlet.
		The Precision Gear Pump(s) are matched with an appropriate precision grade Speed Reducer whereby optimum resolution and operating efficiencies are achieved.
	www.chemsystems.net /smartpump (687 words)

	Gear Pump Prices at Dynaflow-Pumps.Com (Site not responding. Last check: 2007-10-21)
		The pumps on behalf of many common OEM requirement on behalf of optimum flow in addition to head characteristics.
		These pumps are simple within plan in addition to robust in addition to sturdy within construction.
		California Centrifugal Pump, Inc. - Authorized sales in addition to service on behalf of pumps, blowers, gear boxes in addition to turbines.The standard stuff on behalf of that sleeve bearing is high-density carbon, that has self-lubricating possibilities if process flows are reduced.
	www.dynaflow-pumps.com /gear-pump-prices.php (633 words)

	Pump Types Explained - Free ebook online sample.
		A gear pump uses two meshing, toothed cogs to force liquid from the inlet of the pump through to the outlet.
		Being a positive displacement pump there deliver very precise quantities for each revolution and this means they have good dosing characteristics regardless of their speed or the pressure into which they discharge.
		Gear pumps usually have one shaft penetration through the housing for connection to the drive.
	www.feedforward.com.au /pump_types_ebook.htm (441 words)

	Internal Gear Pumps \| Viking Pump, Inc. \| IDEX Corporation
		The internal gear pumping principle was invented by Jens Nielson, one of the founders of Viking Pump.
		gears which un-mesh at the suction side of the pump to create voids which allow atmospheric pressure to force fluid into the
		The spaces between the gear teeth transport the fluid on either side of a crescent to the discharge side, and then the
	www.fickesspumps.com /INTGEAR1.html (107 words)

	Gear Pump
		The Barwell range of Continuous Gear Pump Preformers have been designed in response to market demands whilst incorporating the traditional standards of Quality, Performance and reliability that is expected from the World’s leading Prefomer specialist.
		In either case the system combines the convenience and performance of a cold feed extruder with a gear pump to accurately control material flow and an intelligent cutter control system to ensure preform accuracy.
		A high speed cutter is linked to the gear pump material flow via intelligent controls, with full recipe database and automatic weight control with integrated weight scale loop feedback.
	www.barwell.com /html/gear_pump.html (195 words)

	Use of Gear pumps with Asphalt Emulsion
		External gear pumps generate a pumping action by using two gears that come into and out of mesh to produce flow.
		The Macropaver uses an external gear pump as its standard emulsion pump to handle both standard and polymer modified emulsions.
		The external gear pump is a reliable fixed displacement pump that is not affected by polymers or latex used in microsurfacing emulsions.
	www.slurry.com /equip_gearpump.shtml (447 words)

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