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Hydraulic Gear Pumps

hydraulic gear pump

 

A gear pump is a hydraulic pump which is used as a meshing gears, to pump the fluid by displacement. They are one of the most common types of pumps for hydraulic applications. The Gear pumps are also widely used in chemical installations to pump fluid with a certain viscosity. Gear pumps are positive displacement (or fixed displacement), meaning they pump a constant amount of fluid for each revolution. Some gear pumps are designed to function as either a motor or a pump.

Our gear pump utilizes the meshing of gears to pump fluid through displacement. Our pumps are most extensively used pumps for hydraulic fluid power applications in various industries. These pumps also function with great amount of accuracy in various chemical installations. Made of superior quality raw material and designed to perfection, our gear pumps are long lasting and durable in nature. These pumps are simple in design and robust and sturdy in construction. Only tested materials are used to give them long life. They are built in various sizes and versions to suit every possible industrial application.

The wide assortment of gear pumps we manufacture are cast iron hydraulic gear pumps, multistage hydraulic gear pumps and others. For lubrication, the gear pump uses a small amount of oil from the pressurized side of the gears which makes these pumps cost effective in the long run. Our expert team of engineers uses latest technology in manufacturing these gear pumps. The product is quality tested by our quality controllers and ensures high performance and flawless features. We use only best quality raw materials procured from reliable sources. We are also a well known exporter and our product has been appreciated by our international clients for corrosion resistance feature, durability and efficiency. Our range finds its application in different industry sectors.

Applications Of Hydraulic Gear Pumps

 These Gear Pumps are widely used in Hydraulic application in various industries. Various models are available as per customer need and application. Available with us is a comprehensive range of Hydraulic Gear Pumps. The functioning of these pumps is associated with utilizing the meshing of gears to pump fluid through displacement. These pumps  hold a huge demand to be used in hydraulic fluid power applications in various industries.

Applications of hydraulic gear pumps:

  • Transfer of various grades of oils like light Diesel Oils, Fuel Oils,
  • Transformer oils, lube oils, castor oils, grease, wax etc.
  • Transfer of chemicals like sodium silicate, caustic soda, resins, enamels, adhesives, fatty acids, paints and varnish, pulp, juices, Syrups, Alcohol, Kerosene, etc.
  • Atomizing of fuel oil at high pressure for burners and boilers.
  • Lubrication of gear boxes, cranes, Machine tools, etc.
  • Cooling and filtering in machine tools.
  • Heat transfer liquids for chemical vessels.
  • Hydraulic systems for presses, power pack units etc.

Generally used in:

  • Petrochemicals: Pure or filled bitumen, pitch, diesel oil, crude oil, lube oil etc.
  • Chemicals: Sodium silicate, acids, plastics, mixed chemicals, isocyanates etc.
  • Paint and ink industry.
  • Resins and adhesives industry.
  • Pulp and paper: acid, soap, lye, black liquor, kaolin, lime, latex, sludge etc.
  • Food: Chocolate, cacao butter, fillers, sugar, vegetable fats and oils,   molasses, animal food etc.

Pumping System:

  • Useful for fuel oil loading and unloading.
  • Pumping & Heating system.
  • Force feed lubrication system.
  • Circulation & cooling system.
  • Pumping & filtration system.

 

Usage of Hydraulic Gear Pumps

Drives

Use of flexible coupling is recommended to accommodate any slight misalignment of shaft and to dampen vibration.

hydraulic gear pumps

 

The user should work closely with the coupling manufacturer in selecting and applying a suitable coupling. Drives should be arranged so that the shaft is protected from all axial and radial loads. The coupling should allow a minimum of 0.25mm radial movement and should impose little or no end load. Splines must allow sufficient radial movement.

A large angle between the drive and connecting shafts should be avoided (100 max.). Splined shaft units may be plugged directly into a rigidly supported mating part, only if the concentricity between the female spline and pilot diameter is better than 0.12 mm T.I.R. In case where manufacturing tolerances exceed this figure, the application should be referred to our Technical Sales Department. When flexible couplings, gears, Vee or toothed timing belts are to be used, the coupling half, gear or pulley, should be secured to the drive shaft.

If this is not possible, continuous lubrication to the shaft must be provided to maintain maximum life. This can be done by flooded lubrication, oil mist lubrication or by applying molybdenum disulfide based grease during initial assembly.

Side loads by indirect drives can be accommodated, but allowances must be made for the extra side load that these drives impose on the pump bearings. In general larger the gear, sprocket, or pulley diameter and the closer this is to the pump-mounting flange, lesser the load on the bearings. However, the loading must be carefully calculated and should be referred to our Technical sales Department.

Both parallel and taper shaft units are supplied with a shaft key. The parallel shaft keys must be hand-fitted when the coupling is assembled. On no account must the key or coupling be fitted, or removed by hammering or levering. This will damage the pump internally.

Mounting

The pump may be mounted in any position. The units are supplied with a wide variety of mounting flanges, having a spigot for location. The fixture that receives the mounting flange spigot should have 1mm x 450 chamfer to ensure proper installation. To minimize vibration, which can be transmitted to the pump by rigid pipe runs, it is good practice to use flexible hose immediately connected to the unit ports.

Rotation

Shaft rotation is denoted in the unit coding. Inlet and Rotation arrows are stamped on the unit body. Direction of rotation is as viewed from the drive shaft end (see coding chart).

Pump Suction Line

The suction line must be as large as possible and should be free from sharp bends to prevent excessive suction head, which should in no case exceed 190 mm of mercury (0.24 bar) below atmospheric pressures. The system should be designed to prevent entry of air and a positive head of oil should be maintained wherever possible. Lower pressures during cold start – up conditions are permissible for short periods.

As a general guide, fluid velocity in the pump suction line should not exceed 2 m/sec for pipe lengths up to 2 meters. If longer suction runs or higher velocities are contemplated, contact us before use.

Oil Reservoir

As a general rule of thumb, the reservoir capacity for industrial applications should be three to five times the open loop flow per minute being drawn from the reservoir. For mobile applications, the reservoir should be sized for not less than 0.75 times the open loop