Hydraulic Gear Pumps
Welex is Manufacturer and Exports of Hydraulic gear pumps for Agriculture and road Constructions Equipments Rubber plastic moulding machinery, Materials Handling Equipments, Lubricating System, Earth Moving Equipments, Industrial Hydraulic Power Pack and so many other Industrial Application with Global Standards.

Performance
WELEX has a range of Gear Pumps for mobile and industrial use, WELEX developed these pumps with 100% indegineous raw material and proven manufacturing process.

Basic Range
WELEX Gear Pumps are available for industrial use in different size flow of 0.8 lpm to 6.8lpm & 7.7 lpm to 40.00 lpm and upto 225lpm @ 1500 rpm. WELEX also make multiple pump and special pumps as per customers requirements.
 

Efficient Gear Pumps
High quality of gears to minimize leakage across gear tips, high precise geometrical tolerance of body and bearing blocks with seals for high volumetric efficiency and specially designed thurst bearing, bush gives low noise, Du-lined, bi-metal bearings for jerkless operation and working against high mechanical loads operating up to 200 bar and upto 3000 rpm.
 

Low pressure bearing lubrication is feature of all WELEX 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. This proven system ensures efficient cooling and lubrication of the bearing with a constant supply of fluid independent of operating condition.
 

Durability
All WELEX Gear Pumps are backed by full 3 months warranty. High tensile aluminium alloy are used to ensure maximum fatigue strength. Through body bores enable precise alignment of the bearing and hence maximum s bearing load capacity. Careful attention to machining details and surface finishes, holds wear rates to a minimum and promotes extended operating life. WELEX Gear Pumps have been designed to perform with a wide range of fluids and can be supplied with nitrile and viton seals as required.
 

Drives
Use of a flexible coupling is recommended to accomodate any slight misalignment of shaft and to dampen vibration. Splines must allow sufficient radial movement. Two couplings are necessary to ensure radial alignment. 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 of 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 either two or four bolt flanges and with a spigot for location. The fixture that receives the mounting flange spigot should have 1 mm 45° chamfer to ensure proper installation. To minimize vibration, which can be transmitted to the pump by rigid runs, it is good practice to use flexible hose immediately connected to the unit ports.

Oil Reservoir
As a general, 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 flow of course, the volume for rams and actuators must be allowed for providing adequate air space and breathing. The pump suction line should draw oil from a point not less than 100mm above the tank bottom to avoid sludge deposits from entering the pump. The return line should be submerged to limit frothing of oil. The suction and return connections should be positioned s far apart as possible and separated by baffles, so that oil circulations promoted within the tank to assist convection cooling and allow air entrained in the oil dissipate.
 

Filteration
The fluid should be filtered during top-up and continuously during operation to achieve and maintain a cleanliness level of ISO 17~/14. The recommendation should be considered a minimum. Better Cleanliness levels will significantly increase component life. Each systems should be analyzed to determine the proper method of filtration needed to maintain the required cleanliness levels. depending on the configuration and complexity of the system.
 

Fluids
Most premium grade mineral oil based hydraulic fluids are suitable for use with WELEX Gear Pumps. A primary consideration in the selection of Hydraulic fluid is expected oil temperature extremes that will be experienced in service. When choosing the Hydraulic fluid, these temperature extremes must be considered to obtain the most suitable temperature-viscosity characteristic. For optimum performance, the viscosity should be maintained in the 97-456SUS, 20 - 100 - cST Change. Limiting viscosities of 4545 SUS, 1000 cST maximum and 52 SUS, 8 cST minimum should not be exceeded. It may be possible in some application to run on other types of special fluids contact WELEX for more details.
 

Operating Temperature Range
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.