Axial Piston Variable Pump A7VO - Group VH A/S

Blocked for new applications / Für Neuanwendung gesperrt12/32 Bosch Rexroth AG A7VO RE 92 202/03.06DR Pressure ControlDRSPressure control with load sensingCharacteristic DRSThe load sensing control is a flow control option that operatesas a function of the load pressure to regulate the pump displacementto match the actuator flow requirement.The flow depends here on the cross section of the externalsensing orifice (1) fitted between the pump outlet and theactuator. The flow is independent of the load pressure belowthe pressure cut-off setting and within the control range of thepump.The sensing orifice is usually a separately arranged loadsensing directional valve (control block). The position of thedirectional valve piston determines the opening cross sectionof the sensing orifice and thus the flow of the pump.The load-sensing control compares pressure before and afterthe sensing orifice and maintains the pressure drop across theorifice - and therefore the pump flow - constant as a function ofthe orifice size.If the differential pressure Δp increases, the pump is swivelledback towards V g min and, if the Δp decreases the pump isswivelling out towards V g max until the pressure drop across thesensing orifice in the valve is restored.Δp orifice = p pump – p actuatorSetting range for Δp _________________________ 14 – 25 barOperating pressure pB in barSetting range350max50minCircuit diagram DRSU RFlow q v in L/minX4B (A)V g min V g maxA1(1)max. 10 barStandard setting _________________________________18 bar(please state in clear text when ordering)The stand-by pressure in zero stroke operation (sensing orificeplugged) is slightly above the Δp setting.(1) The sensing orifice (control block) is not included in thepump supply.X3T1SPosition (1) is not included in the pump supply.