Blocked for new applications / Für Neuanwendung gesperrt4/32 Bosch Rexroth AG <strong>A7VO</strong> 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
Blocked for new applications / Für Neuanwendung gesperrtRE 92 202/03.06 <strong>A7VO</strong> Bosch Rexroth AG 5/32Technical DataTable of values (theoretical values, ignoring η mh and η v ; values rounded)Size 28 55 80 107 160Displacement V g max cm 3 28,1 54,8 80 107 160Speed max. 1 ) at V g max n max1 rpm 3150 2500 2240 2150 1900at V g < 0,74 • V g max (see diagram, page 4) n max2 rpm 4250 3400 3000 2900 2560Speed max. 2 ) n max perm. rpm 4750 3750 3350 3200 2850Flow at n max1 and V g max q v max1 L/min 89 137 179 230 304Power at q v max1 and Δp = 350 bar P max1 kW 52 80 105 134 177Torque at V g max and Δp = 350 bar T max Nm 156 305 446 596 891Mass moment of inertia (of the rotating parts) J kgm 2 0,0042 0,0042 0,0080 0,0127 0,0253Filling capacity V L 0,5 0,75 1,2 1,5 2,4Mass (approx.) m kg 17 25 40 49 711 ) The values shown are valid for an absolute pressure (p abs ) of 1 bar at the suction port S and when operated on mineral fluid with aspecific mass of 0,88 kg/L.2 ) Maximum speed (speed limit) for an increase in the inlet pressure p abs at the suction port S and V g < V g maxDetermining the sizeFlow q v =Torque T =Power P =V g • n • η v1000V g • Δp20 • π • η mh2 π • T • n=q v • Δp60000 600 • η tL/minNmkWV g = Displacement per revolution in cm 3Δp = Differential pressure in barn = Speed in rpmη v = Volumetric efficiencyη mh = Mechanical-hydraulic efficiencyη t= Overall efficiency