Variable Displacement Pump A4VG - Group VH A/S

RE 92 003/05.03 | A4VG Mobile Hydraulics | Bosch Rexroth AG 5/52Technical DataFiltrationThe finer the filtration the better the achieved purity grade ofthe pressure fluid and the longer the life of the axial piston unit.To ensure safe operation of the axial piston unit, a minumumpurity grade of20/18/15 to ISO 4406 is necessary.At very high temperatures of the hydraulic fluid (90°C to max.115°C) at least purity grade19/17/14 to ISO 4406 is necessary.If above mentioned grades cannot be maintained pleaseconsult us.Temperature range of the radial shaft sealThe FKM shaft seal is admissible for a housing temperaturerange from -25°C to +115°C.Note:For applications below -25°C a NBR shaft seal is necessary(admissible temperature range -40°C to +90°C).When ordering, please state in clear text: with NBR shaft sealOperating pressure rangeInletVariable pump (with external supply, E):for control devices EP, EZ, HW and HD1boost pressure (when n = 2000 rpm) p Sp _________________20 barfor control devices DA, DGboost pressure (when n = 2000 rpm) p Sp _________________25 barAuxiliary pump:suction pressure p s min (ν ≤ 30 mm 2 /s) ____ ≥ 0,8 bar absolutefor cold start__________________________ ≥ 0,5 bar absoluteCase drain pressureThe lower the speed and the case drain pressure the higherthe life expectation of the shaft seal ring. The values shown inthe diagram are permissible loads of the seal ring and shall notbe exceeded.Stationary pressure loads in the range of the max. admissibleleakage pressure may cause a reduction of the life experienceof the seal ring will result.For a short period (t < 5 min) pressure loads up to 6 barindependent from rotational speeds are permissible.perm. pressure p abs. max.in bar6543211000size 125 sizes 40,56size 180 sizes 71,90 size 28size90size71size562000 3000 4000 5000speed n in rpmsize 28size 40OutletVariable pump:Pressure at port A or Bnominal pressure p N _________________________________________ 400 barpeak pressure p max __________________________________________ 450 barsummation pressure p max ___________________________________ 700 bar(pressure A + pressure B)Auxiliary pump:peak pressure p H max __________________________________________ 40 bar(pressure data according to DIN 24312)