Axial Piston Variable Pump A7VO - Group VH A/S

Blocked for new applications / Für Neuanwendung gesperrt4/32 Bosch Rexroth AG A7VO RE 92 202/03.06Technical DataOperating pressure rangeInletPressure at port SThe minimum inlet pressure depends on the speed. The followinglimits may not be exceeded.p abs min _________________________________________ 0,8 barThe maximum pressure p abs max also depends on speed (seesucceeding diagram).Minimum inlet pressure at suction port S with increasedspeedIn order to avoid damage of the pump a minimum inlet pressureat the suction port must be assured. The minimum inlet pressureis related to the rotational speed and the displacement ofthe variable pump.1,52,3nn max 1Speed1,42,01,91,31,81,71,61,21,51,41,31,11,21,11,01,00,90,90,80,80,6 0,7 0,8 0,9 1,0DisplacementV gV g maxNote:– max. permissible speed n max perm. (speed limit, see page 5)– min. and max. permissible inlet pressure at port S– permissible values for the shaft seal ringOutletMaximum pressure at port A or B(pressure specifications in according to DIN 24312)no radial loading(coupling)with radial loading 1 )(pinion or belt drive)Nom. pressure p NInlet pressure pabs in barPeak pressure p max350 bar 400 bar315 bar 400 bar1) please observe the permissible radial loading, see page 6Leakage fluidThe leakage fluid chamber is connected to the suction chamber.A leakage fluid line to the tank is not required (both portsR are plugged).Exception: A leakage fluid line for discharge from port T 1 to thetank is imperatively necessary for pressure control or pressurecut-off.Shaft seal ringPermissible pressure loadThe service life of the shaft seal ring is affected by the speedof the pump and the leakage fluid pressure (max. permissibleleackage fluid pressure 6 bar abs. at reduced speed, as todiagram). Short-term (t < 5 s) pressure spikes of upto 10 bar absolute are permitted. The more frequently thepressure peaks are occurring, the shorter the service life of theshaft seal ring.It is recommended the average permanent leakage fluid pressuremust not exceed 3 bar absolute.The pressure in the case must be equal to or greater than theexternal pressure on the shaft seal ring.The pure mechanical resistance to case pressure is approximately20 bar.Perm. pressure pabs. max. (bar)654321size 107size 160size 28size 55size 800 2000 4000 6000Speed n (rpm)Temperature rangeThe FKM shaft seal ring is admissible for a case temperaturerange from -25°C to +115°C.Note:For applications below -25°C a NBR shaft seal ring is necessaryas special version (admissible temperature range -40°C to+90°C). When ordering indicate NBR shaft seal ring in cleartext.Direction of flowDirection of rotation, viewed on shaft endclockwisecounter-clockwiseS to BS to A