Pneumatic And Hydraulic Equipment Page 911

DR - Pressure control The DR-pressure control limits the maximum pressure at the pump outlet within the pump's control range. The pump therefore supplies only the amount of fluid as required by the actuators. This maximum pressure level can be set steplessly at the control valve. DRG - Pressure control, remote The DR-pressure control is overriding this DRG- remote setting of max. outlet pressure. A pressure relief valve can be externally piped to port X for remote setting of pressure below the setting of the DR control valve spool. This relief valve is not included in the pump supply. The differential pressure at the DRG-control spool is set as standard to 290 psi (20 bar). This results in a pilot fluid flow to the relief valve of approx. 0.4 gpm (1,5 L/min) at port X. If another setting is required (range from 145 and 320 psi (10 to 22 bar)) please state in clear text. DFR/DFR1 - Pressure and flow control DFLR - Pressure-flow-power control In additon to the pressure control function, the pump flow may be varied by means of a differential pressure over an orifice or valve spool installed in the service line to the actuator. The pump flow is equal to the actual required flow by the actuator, regardless of changing pressure levels. The pressure control overrides the flow control function. In order to achieve a constant drive torque with a varying operating pressure, the swivel angle and with it the output flow from the axial piston unit is varied so that the product of flow and pressure remains constant. Flow control is posssible below the limit of the power curve. not included in supply Schematic DRG Static characteristic at n 1 = 1500 rpm; t fluid = 122 F (50 C) L B S L 1 X 20 280 290 4000 i s p ) r a b ( Flow q v [gpm (L/min)] operating pressure p B Hysteresis and pressure rise p max Setting range (35) (280) 4000 510 i s p ) r a b ( Flow q v [gpm (L/min)] operating pressure p B Hysteresis and pressure rise p max Setting range L B S L 1 Schematic DR Static characteristic at n 1 = 1500 rpm; t fluid = 122 F (50 C) Static characteristic Flow controller at n 1 = 1500 rpm; t fluid = 122F (50C)) X L B S L 1 closed in DFR1 valve not included in supply Schematic DFR (35) (280) 510 4000 i s p ) r a b ( Flow q v [gpm (L/min)] operating pressure p B q v see table Setting range Static characteristic at 1800 rpm not included in supply Schematic DFLR X L B S L 1 (0) (50) (100) (150) (200) (250) (280) (300) 0 725 1450 2200 2900 3600 4000 4350 0 100 Maximum power curve Minimum power curve Operating pressure p [psi (bar)] PISTON PUMP CONTROL Rexroth Bosch JHF Catalog [ Volume 7 ] (314) 427-0600 800-444-0522 (FAX) 314-427-3502 www. j hf.com 911 Prices Subject to Change Without Notice John Henry Foster pneumatic and hydraulic equipment

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