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 GEAR PUMPS
 ORBITAL MOTORS
 GEAR MOTORS
 FLOW DIVIDER
 SECTIONAL AND MONOBLOCK VALVES
 HEAT EXCHANGER FROM TURKEY
 ITALY CARTRIDGE VALVES
 GEAR PUMPS
 LOG SPLITTER VALVES
 GEAR PUMP
 
 
 
 Introduction of GRH Gear Pump
Gear pumps from GRH Hydraulic have a floating bushing feature with automatic axial clearance compensation. The bushings are made with special abrasion resistant material providing improved service life. Precisely machined gears ensure our units provide excellent low noise characteristics. Our cold extrusion motor bodies can endure pressures above 30Mpa. High strength cast iron front & rear covers also enhance our reliability. Our units are widely used in the industrial, mobile, marine and aerospace industries.
GRH Gear Pump Character
★ GRH gear pumps are produced in 7 different versions (0P, 1P, 1.5P, 2P, 2.5P, 3P, 3.5P) and in each group different displacements are obtained by changing the gears width, refer to performance curves on page 5 to page 8.
★ Pressure: GRH offers two  pressure ratings, F and G, pleas refer to charts.
★ Efficiencies: volumetric up to 98%, mechanical up to 93%.
★ Mountings: flanges, shaft ends and ports.
★ Seals: Viton seals available.
★ Integrate: all pumps can be ordered with relief valve and check valve.
Peak: 250bar
Intermittent: 230bar
Rated: 200bar
  
Peak: 300bar
Intermittent: 280bar
Rated: 250bar
  
To achieve the performance it necessary not only to meet the catalogue but also to take real care of the design of the hydraulic as a whole, in particular:
★ The design of the hydraulic circle, especially the suction line, dimension and position of the valves, the filters the reservoirs and the heat exchanger.
★ Ensure correct and frequent cleaning and maintenance of the circle and of the hydraulic fluid.
★ Equip the circuit with suitable alarm and safety devices.
★ Avoid possible starting under load at lower temperature.
★ Avoid high pressure at low speed.
★ In reason choice oil is major factor.
 Hydraulic Fluid
★ Fluidmustbe specifically for hydraulic equipment,it must be nonfoaming,antioxidant,noncorrosive and have good lubricating features meeting the following requirements:
     Recommended use:GB11118-94:L-HM46 or equate NFE-603/DIN51524Ⅱ-85

Minimum Rotational Speed

★ We recommend a minmum rotational speed for every pump groupas follows:
     0P:800RPM
     1P:600RPM
     1P~2.5P:500RPM
     3P:400RPM
Hydraulic circuit
★ Avoid shard restrictions and small radius bends.
★ Place safety relief valve set at correct pressure and with good dynamic characteristic.
★ Recommended fluid speed in the inlet line—1.6~5ft/s(0.5~1.5m/s).
★ Recommended fluid speed in the delivery line—6.5~20ft/s(2~6m/s).
★ Recommended fluid speed in the return line—5~10ft/s(1.5~3m/s).
★ Reservoir should have a capacity about twice as much as the volume Of delivered by the pump in one minute.
★ The return and inlet pipe must be saparated as far as possible and under the minmum level of the oil.
★ Install pump in a well cleaned environment,and make sure ,prior starting the system  that all pipea and reservoir are perfectly clean it is recommended to filter the new oil at 8-10um,befor filling the reservoir.
★ Fill the pump with fluid befor installing and check the direction of  rotation .
★ For the first run of the pump it is advisable to disconnection the pump diacharg in order to purge the air from the system.
 GRH Gear Pump Character
★By far largest number of premature failures of gear pumps are due to conta mination; filtering  with clogging indicating and alarms is recommended .
★The initial contamination of the fluid must not exceed clss 10 NAS 1638,pass experience has shown that even brand new fluid often exceed this value.in this case it is recommended below:60 μm inlet ,and in the return side:

Standard

P<2000PSI(14MPa)

2000PSI(14MPa)<P<3050PSI(21MPa)

P>3050PSI(21MPa)

NAS1638

10

 9

8

ISO4406

19/16

 18/15

17/14

FILTER

 25μm

 20μm

10μm

 
 
 
 
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