Their task is to produce a constant flow and at the same time pass on the required forces. However, the external gear pump uses two identical gears rotating against each other. A gear pump uses the meshing of gears to pump fluid by displacement. Gear pumps make good chemical additive dosing pumps provided material compatibility issues are addressed. They are one of the most common types of pumps for hydraulic fluid power applications. As the gears come out of mesh on the inlet side, liquid is drawn into the pump. Azpf and azpn external gear pump bosch rexroth usa. Looking for dayton rotary gear pump, with motor, hp, voltage 115230 6dhh9. Internal gear pumps can be used up to a continuous pressure of 315 bar 4550 psi depending on the frame size. Liquiflo gear pumps are available with several ancillary options and accessories.
Gear pumps are wellsuited to tandem combinations of pumps in which the drive shaft of the first pump is extended to drive a second pump, and sometimes a third pump in the same manner. Demonstrative drawing of the pz2 type gear pump structure. Liquiflo gear pumps can be configured with packing, single or double mechanical seals or magneticdrive. The liquid is forced out the discharge port by the meshing of the gears. This pump principle features a compact design with particularly high energy density. Suitable for applications where the pressure is lower than. The pump features a casing in which a dual gear an outer rotor gear and an internal idler gear and crescent assembly is housed. External gear pumps external gear pumps are not pumps with their gears on the outside of the pump body. Northern pumps can be designed to operate in either direction, however they can only operate in the manner they are designed. An internal rotary gear pump employs a positive displacement principle. Selection of a positive displacement pd rotary pump is not always an easy choice.
Standard gear pumps to view a gear pump, please click on the name below or use the bookmarks in your pdf software. Misalignment longcoupled pump align pump and motor. Most pd pumps can be adapted to handle a wide range of applications, but some types are better suited than. Many external gear pumps use journal bearings to support the rotating shafts. Gear pumps are used to generate a flow of fluid and to impart the necessary forces on this fluid flow to create pressure against a resistance such as a. The flow output of the pump is equal to the rotational speed rpm times the displacement. Liquiflo gear pumps are manufactured from highalloy materials such as 316 stainless steel, alloyc and titanium, and a variety of corrosionresistant and wearresistant internal materials. If tightening is no longer possible, the gear pump must be replaced. Further configuration variants are given by different flanges, shafts, valve arrangements and multiple pump combinations. This nomenclature differentiates it from an internalgear pump, which has one gear.
They mainly consist of the housing 1, mounting flange. Gear pump basics positive displacement rotary gear pumps two gears of equal size drive shaft and gear are rotated by a motor or auxiliary motion shaft drive gear turns the driven shaft and gear. If the pressure plate hangs during removal, do not force or bend the plate. Their main interest is not the pump itself, but smooth, highquality, uninterrupted production at a lower total cost.
Internal gear pumps generate flow using a gear with externallycut teeth contained in and meshed with a gear with internallycut teeth. In order for these bearings to work, a minimum speed is required depends upon pressure of the pump. External gear pumps 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 figure 2. The gear pump was invented around 1600 by johannes kepler gear pumps are also widely used in chemical installations to pump high viscosity fluids. When using a gear pump a pressure relief valve must be fitted to protect the pump if deadheaded against a closed valve or blockage. Gear pump model g4, series 2x sizes 40 to 100 ra 10 04203.
The gear pump is equipped with a selfsealing pump shaft packing. Bosch rexroth has been involved with the design, development and manufacture of gear pumps for many decades. Pgf hydraulic pumps are leak gapcompensated internal gear pumps with a. Ip65rated washdown pump with stainless steel housing. Prevent hot melt material from flowing out of the bores of the tank when the pump is removed. Displacement d the displacement of a rotary gear pump is the volume displaced during one complete. The pump contains memory enough to store 4 sets of operating parameters. They have gear shafts with the teeth on the outside external part of the shaft, but inside the pump housing as in figure 1. Remember, at central qld hydraulics, we take any old pumps and motors that are preserved well, replace their damaged parts to make them go on doing their outstanding work as new pumps and motors. Development and manufacture of gear pumps for many decades.
Issue 5 section 1 standard gear pumps to view a gear pump, please click on the name below or use the bookmarks in your pdf software. Can be combined with pgh internal gear pumps, pv7 vane pumps and axial. Common suction port for double pump, on request monoblock intermediate flange, on request external gear pump type g2, series 4x type g2 hydraulic pumps are selfpriming external gear pumps. To return to this page, please click on the red text in the top corner of each page. In most cases, each pump is isolated from its neighbour, i. Internal gear pumps are made to close tolerances and are damaged when pumping large solids. At speeds above 1725 rpm, the minimum relief valve settings increase. Making these units the most flexible in todays cost minded market. All liquiflo gear pump models are available in closecoupled configuration. Defects classification pawel pietkiewicz chair of mechanics and machine design university of warmia and mazury in olsztyn k e y w o r d s. Rexroth gear pumps pdf there is no doubt that the geartype pump is the most widely used design in hydraulic. Rotary gear pumps finds wide application in power plant, steel mills, refineries, oil storage. Rotary gear pumps finds wide application in power plant, steel mills, refineries, oil storage instolations etc.
Excessive noise and vibration suction andor discharge piping not anchored or properly supported anchor per hydraulic institute standards. Rated size ng 005 006 008 011 0 016 019 022 025 spec. Introduction and contact details tfp50 group 12 gear pumps tfp0nn 3. At irregular intervals, hot melt material can leak out of the packing.
As the rotor gear begins to turn, the idler gear rotates with the teeth beginning to mesh accordingly. Pump school currently focuses on rotary pumping principles. Eaton ternal ear pump d series pcc01 december 14 7 model code double pump the following 29digit coding system has been developed to identify standard configuration options for the external double gear pump. Rotary gear pump type hgn bitumen pump,glycerine pump,lube. E n g i n e e r i n g gear pump basics the external gear pump is a positive displacement pd type of pump generally used for the transfer and metering of liquids. The sep3nn gear pump is available in a limited displacement range from 22. In a standard pump, this characteristic is repeated each time a gear tooth meshes.
Factory set gear pumpheads overview of gear pumps flow rates and models flow rates mlmin bar model page min. All 29 digits of the code must be present to release a new product number. Abstract the paper comprises research results of the gear pump typical failures and their connection with symptoms observed. Rotary pump family tree positive displacement pd pumps are divided into two broad classifications, reciprocating and rotary figure 1. We have medium pressure and highpressure pumps in our product portfolio. They give high volumetric flows even with high operating pressures, a low noise level, and they have a high endurance thanks to the balancing system of the loads on the guide bushings. Rotary gear pumps proven pump solutions for the best results. Tap lightly with a soft nonmetallic hammer to drive the plate back down. It may be calculated from the physical dimensions of the gears, or it. Gear pumps galtech group 2 start pumps 12 tooth gears and consequent decrease in noise levels. Bosch rexroth external gear pumps pumps, motors, valves, filtration, accessories and more descase, bosch rexroth, danfoss uk distributors. A selected program of single and multiple pumps is available within 10 working days.
The mk20s wide range of output flowspressure ratings of up to 3000 psi and. Rotary gear pump selection guide rotary gear pumps are positive displacement pumps that are commonly used for liquid circulation, lubrication, pressure boosting, filtering, medium pressure spraying, sump draining, drum and vat filling, and general fluid transfer applications. Wellproven designs, the use of specially developed materials, constant testing and sophisticated mass production techniques ensure products of the very highest quality. Rexroth external gear pumps are available as standard gear pumps in the 4 series of b, f, n and g and as silence gear pumps in the series of s, t and u, in which the displacements are graded by different gear widths. Bosch rexroth external gear pumps neilson hydraulics. Attempting to replace the pump shaft packing can cause serious problems. Pump model hg050 hg075 hgioo hg125 hg150 hg200 hg 250 inlet outlet 12 x 12 34 34 112 x 112 20 30 50 75 110 225 350 51 63 5 64. Platform f,fixed displacement,size,4,5,8,11,14,16,19,22,continuous pressure,190 bar,2750 psi,180 bar,2600 psi,170 bar,2450 psi,continuous pressure up to,190 bar,2750. Base not rigid enough tighten holddown bolts on pump and motor or adjust stilts. Rexroth gear pumps pdf there is no doubt that the gear type pump is the most widely used design in hydraulic. End clearance is the closeness of the rotor gear to the head of the pump. External gear pump series g azpg22 fixed pumps v 22. Typically, gear pumps have efficiencies around 85%. Figure 3 shows some examples of external gear pumps.
Flange and cover in aluminium or on request, cast iron. Use this model code to specify a pump with the desired features. These include temperature control jackets, gear reducers, variable speed drives, air motors, relief valves, repair kits, replacement cartridges and base plate mounting. Troubleshooting guide troubleshooting guide part 1 problem possible cause corrective action no discharge pump not primed verify suction pipe is submerged. These options allow liquiflo gear pumps to be specially engineered to.
External gear pumps are costeffective displacement pumps. These pumps can handle small suspended particulate in abrasive applications, but. Gear pumps, laboratory pumps, dosing pumps, metering pumps. We do lots of different shafts, flanges and bodies european american some japanese as well as specials for various tractor makes etc. Size from 12 to 3 bsp, capacity from 20 lpm to 500 lpm max, working pressure 11kgcm 2, temp 90c viscocity, 10,000 cst. The prv can be piped back to the suction side of the pump or into the supply tank. Figure 1 by definition, pd pumps displace a known quantity of liquid with each revolution of the pumping elements i. Internal gear pump gear pump 70 50 40 0 10 sound pressure level db a operating overpressure bar 60 80 20 30 40 50 60 70 80 90100 32 supply volume lmin 90 4 45 1 gear pumps gear pumps 2 1,2 0,8 0 3 factor k operating over pressure bar 1,6 2,4 6 9 12 15 18 21 1,8 1 1,4 2,2 2,6 700 cst 380 cst 190 cst 68 cst 38 cst series fl 0,5. The pump is so named because it has two gears that are sidebyside or externalto each other. A basic gear pump will have a rotary housing containing two or more gears toothed wheels, helical gears or lobed cams. Internal gear pump eips2 type eips2 with constant displacement volume technical data. The moment you buy a johnson pump brand gear pump from spx process equipment, you will join thousands of industrial customers who rely on our pump technology.