Proportional pressure reducing valve, pilot operated RE 975/. Replaces:.9 /8 ype DRE(E) and ZDRE(E) Size 6 Component series X Maximum operating pressure bar Maximum flow 3 l/min able of contents Contents Page Features Ordering code, 3 Symbols 3 Function, section 4, 5 echnical data 6, 7 Electrical connection 8, 9 Characteristic curves 9 to 3 Unit dimensions 4 to 8 ccessories 8 Features Pilot-operated valve for reducing the pressure in ports and P with pressure limitation Operation by means of proportional solenoids For subplate mounting or sandwich plate design: Porting pattern according to ISO 44-3---5 Little manufacturing tolerance of the command value pressure characteristic curve due to electrical adjustment in case of operation with external control electronics Minimum set pressure in ports or P, see page ypes DREE and ZDREE with integrated electronics (OBE) : With types DREE and ZDREE, the EMC directive 4/8/EC is satisfied EN6-6-: EN6-6-3: Information on available spare parts: www.boschrexroth.com/spc
/8 Bosch Rexroth G Hydraulics DRE(E); ZDRE(E) RE 975/. Ordering code DRE 6 X M G4 Subplate mounting Sandwich plate Proportional pressure reducing valve For external control electronics With integrated electronics (OBE) = no code = Z = DRE = no code = E Size 6 = 6 Pressure reduction in channel (subplate mounting) Pressure reduction in channel P (sandwich plate) Position of the mating connector (omitted in case of subplate mounting) Mating connector = = 3 = no code = VP ) = = 4 ) ) Valve mounting face (seal ring recesses in the housing) Component series to 9 = X ( to 9: Unchanged installation and connection dimensions) Pressure rating 5 bar = 5 bar = bar = Without check valve Supply voltage Direct voltage 4 V With manual override Without manual override = M = G4 = N9 = no code
RE 975/. DRE(E); ZDRE(E) Hydraulics Bosch Rexroth G 3/8 * M = V = = F = no code = Further details in the plain text Seal material NBR seals FKM seals Interface electronics Command value to V Command value 4 to m ype (Z)DRE Electrical connection type DRE; ZDRE: K4 = Without mating connector, with connector according to DIN EN 753-83 Mating connector, separate order, see page 8 ype DREE; ZDREE: K4 = Without mating connector, with connector M Cable set, separate order, see page 8 Symbols ( = component side, = plate side) ype DRE 6 ype ZDRE 6 VP P ype DREE 6 P B ype ZDREE 6 VP P P B
4/8 Bosch Rexroth G Hydraulics DRE(E); ZDRE(E) RE 975/. Function, section Valves of type DRE and ZDRE are electrically pilot operated 3-way pressure reducing valves with pressure limitation of the actuator. hey are used for reducing a system pressure. echnical structure: he valve consists of three main assemblies: Pilot control valve () Proportional solenoid () Main valve (3) with main control spool (4) Function: ype DRE General function: Command value-dependent setting of the pressure to be reduced in channel via the proportional solenoid (). In the depressurized port P, the spring (7) holds the main control spool (4) in initial position. hus, opening the connection from to and blocking of the connection from P to. Pressure connection from port P to the ring channel (5). Pilot oil flows from the bore (6) to port, via the flow controller (7), the nozzle (8) to the pilot control valve (), the throttle gap (9) to the longitudinal groove () and the bores (, ). Pressure reduction: Build-up of the pilot control pressure in the control chamber (6) as function of the command value. Movement of the main control spool (4) to the right, hydraulic fluid flows from P to. ctuator pressure pending in port to the spring chamber (5) via channel (3) and nozzle (4). Increase in the pressure in port to the set pressure of the pilot control valve () leads to the movement of the main control spool (4) to the left. Pressure in port is almost identical with the set pressure at the pilot control valve (). Pressure limitation: If the pressure in port exceeds the set pressure of the pilot control valve (), the main control spool (4) is moved further to the left. hus, opening of the connection from to and limitation of the pressure pending in port to the set command value. ype ZDRE In principle, the function of this valve corresponds to the function of type DRE 6. he pressure is, however, reduced in channel P. 6 6 5 3 4 3 ype DRE 6-X/ K4 B P 9 8 7 4 5 7
RE 975/. DRE(E); ZDRE(E) Hydraulics Bosch Rexroth G 5/8 Function, section ype (Z)DREE with integrated electronics (OBE) With regard to function and structure, these types correspond to type (Z)DRE. On the proportional solenoid (), there is moreover a housing (8) with the control electronics. Supply and command value voltage and/or command value current are applied to the connector (9). In the factory, the command value pressure characteristic curve is adjusted with little manufacturing tolerance. 9 8 6 6 P 3 4 3 B ype ZDREE 6 VP-X/ K4 = component side = plate side P 9 8 7 B 4 5 7
6/8 Bosch Rexroth G Hydraulics DRE(E); ZDRE(E) RE 975/. echnical data (For applications outside these parameters, please consult us!) general Weight ype (Z)DRE 6 kg. Installation position ype (Z)DREE 6 kg. Storage temperature range C to +8 mbient temperature range C to +7 hydraulic (measured with HLP 46; ϑ Oil = 4 C ± 5 C) Maximum operating pressure Port P or P bar 35 ny Port P,, and B bar Port bar Separately and to the tank at zero pressure Maximum set pressure in Pressure rating 5 bar bar 5 channels P and Pressure rating bar bar Pressure rating bar bar Minimum set pressure with command value in channels P and bar See characteristic curves page Pilot flow l/min.65 Maximum flow l/min 3 Hydraulic fluid See table page 7 Maximum admissible degree of contamination of the hydraulic fluid Class /8/5 ) cleanliness class according to ISO 446 (c) Hydraulic fluid temperature range C to +8 Viscosity range mm /s 5 to 38 Hysteresis % ±.5 of the maximum set pressure Repeatability % < ± of the maximum set pressure Linearity ype (Z)DRE 6 % ±3.5 of the maximum set pressure Manufacturing tolerance of ype (Z)DRE 6 % ± of the maximum set pressure the command value pressure ype (Z)DREE 6 characteristic curve, related % ±3 of the maximum set pressure to the hysteresis characteristic curve, pressure increasing Step response u + g % 9 % ms 5 Measured with liter standing hydraulic 9 % % ms 5 fluid column ) he cleanliness classes specified for the components must be adhered to in hydraulic systems. Effective filtration prevents faults and at the same time increases the service life of the components. For the selection of the filters see www.boschrexroth.com/filter.
RE 975/. DRE(E); ZDRE(E) Hydraulics Bosch Rexroth G 7/8 echnical data (For applications outside these parameters, please consult us!) hydraulic Hydraulic fluid Classification Suitable Standards sealing materials Mineral oils and related hydrocarbons HL, HLP NBR, FKM DIN 554 HEG NBR, FKM Insoluble in water Environmentally compatible HEES FKM ISO 538 Soluble in water HEPG FKM ISO 538 Water-free HFDU, HFDR FKM ISO 9 Flame-resistant Water-containing HFC Fuchs Hydrotherm 464 Petrofer Ultra Safe 6 NBR ISO 9 Important information on hydraulic fluids! For more information and data on the use of other hydraulic fluids refer to data sheet 9 or contact us! he flash point of the process and operating medium used must be at least 4 K higher than the maximum solenoid surface temperature. here may be limitations regarding the technical valve data (temperature, pressure range, service life, maintenance intervals, etc.)! Flame-resistant - containing water: Maximum operating pressure bar Maximum hydraulic fluid temperature 6 C Expected service life as compared to HLP hydraulic oil 3 % to % electric Supply voltage V 4 direct voltage Minimum control current m Maximum control current m 6 Solenoid coil resistance Cold value at C Ω 5 Maximum hot value Ω 7.5 Switch-on duration % Protection class of the valve according to EN 659 IP 65 with mating connector mounted and locked electrical, integrated electronics (OBE) Supply voltage Nominal voltage VDC 4 Lower limit value VDC Upper limit value VDC 35 Current consumption.5 Required fuse protection. time-lag Inputs Voltage V to Current m 4 to Output ctual current value mv mv m Protection class of the valve according to EN 659 IP 65 with mating connector mounted and locked Electromagnetic compatibility EN 6-6-: -6; EN 6-6-3: -9
IN+ 8/8 Bosch Rexroth G Hydraulics DRE(E); ZDRE(E) RE 975/. Electrical connection (dimensions in mm) ype (Z)DREE Device connector allocation Contact ssignment interface "" ssignment interface "F" Supply voltage 4 VDC (u(t) = V to 35 V); / max.5 Command value input to V; R E = kω 4 to m; R E = Ω Ground 3 V 4 Reference potential command value M plug-in connector port Connector at the amplifier 4 3 Mating connector and wire colors with pre-assembled cable set Please order the cable set separately, see page 8 4 3 4 3 BN Brown WH White BK Black BU Blue +UB V he connection for protective earthing conductor is omitted Connection cross-section: 4 x.75 mm shielded (connect shield in the control cabinet) Ø5 44,5 5 ±75 3 Ø5 39 5 ±75
RE 975/. DRE(E); ZDRE(E) Hydraulics Bosch Rexroth G 9/8 Electrical connection (dimensions in mm) ype (Z)DRE Connection at connector Connection at mating connector PE PE Connection cable for type (Z)DRE Recommendation 6-wire,.75 or mm plus protective earthing conductor and shielding Only connect the screening to PE on the supply side Maximum admissible length m he minimum supply voltage at the power supply unit depends on the length of the supply line (see diagram). Minimum supply voltage in V 3 8 6 4,75 mm mm 4 6 8 Length in m Characteristic curves (measured with HLP46, Oil = 4 C ± 5 C) Pressure in port depending on the command value (manufacturing tolerance) without flow ype (Z)DRE ) Pressure in port in % 8 6 4 4 6 8 Command value in % ) With type (Z)DRE, the manufacturing tolerance at the external amplifier (type and data sheet see page 7) can be adjusted using the command value attenuator potentiometer "Gw". With the digital amplifier, the setting is made using the "Limit" parameter. In this connection, the control current according to the technical data must not be exceeded! In order to be able to adjust several valves to the same characteristic curve, the pressure must - with a command value of % - at no valve exceed the maximum set pressure of the relevant pressure rating.
/8 Bosch Rexroth G Hydraulics DRE(E); ZDRE(E) RE 975/. Characteristic curves: ype (Z)DRE (measured with HLP46, Oil = 4 C ± 5 C) ype (Z)DRE: Pressure in port P or depending on the command value 7 Pressure rating 5 bar ype (Z)DRE Pressurerating bar ype (Z)DRE 6 5 Pressure in P or in bar 5 4 3 Pressure in P or in bar 75 5 5 4 6 8 Command value in % 4 6 8 Command value in % Pressure rating bar ype (Z)DRE 5 Pressure in P or in bar 5 5 4 6 8 Command value in %
RE 975/. DRE(E); ZDRE(E) Hydraulics Bosch Rexroth G /8 Characteristic curves: ype (Z)DREE (measured with HLP46, Oil = 4 C ± 5 C) ype (Z)DRE(E): Pressure in port P or depending on the command value 7 Pressure rating 5 bar ype (Z)DREE Pressure rating bar ype (Z)DREE Pressure in P or in bar 6 5 4 3 Pressure in P or in bar 5 75 5 5 4 6 8 Command value in % 4 6 8 Command value in % Pressure rating bar ype (Z)DREE 5 Pressure in P or in bar 5 5 4 6 8 Command value in %
/8 Bosch Rexroth G Hydraulics DRE(E); ZDRE(E) RE 975/. Characteristic curves (measured with HLP46, Oil = 4 C ± 5 C) Minimum set pressure in port P or with command value V (without counter pressure in channel ) Pressure rating 5 bar Pressure rating bar / bar Minimum set pressure in bar 8 6 4 Minimum set pressure in bar 8 6 4 3 3 Flow in l/min ype DRE ype DRE P ype ZDRE P ype ZDRE P P 3 3 Flow in l/min ype DRE ype DRE P ype ZDRE P ype ZDRE P P Pressure in channel P or flow Pressure rating 5 bar Pressure rating bar Pressure in channel P or in bar 5 4 3 Pressure in channel P or in bar 8 6 4 3 3 3 3 Flow in l/min Flow in l/min ype DRE ype DRE P ype DRE ype DRE P ype ZDRE P Pressure rating bar ype ZDRE P P ype ZDRE P ype ZDRE P P Pressure in channel P or in bar 6 8 4 3 Flow in l/min 3 ype DRE ype DRE P ype ZDRE P ype ZDRE P P
RE 975/. DRE(E); ZDRE(E) Hydraulics Bosch Rexroth G 3/8 Characteristic curves (measured with HLP46, Oil = 4 C ± 5 C) p-q V characteristic curves Pressure differential in bar 3 5 5 5 3 5 5 5 3 Flow in l/min Flow in l/min ype DRE(E) P ype ZDRE(E) P P Pressure differential in bar 3 B B Notice! he shown p value corresponds to the minimum pressure available in port P (P) minus the maximum pressure to be controlled in port (P).
4/8 Bosch Rexroth G Hydraulics DRE(E); ZDRE(E) RE 975/. Unit dimensions: ype DRE (dimensions in mm) 5 max. 4 6 5 84,5 5 4 x 5,4H3 3 83,5 B Ø,3 +,,3 +, 4,3 5 8 3 4 7 6,75 7,5 39,5 F F 44,5-35 B F4 P F3 6,/ Proportional solenoid without manual override Name plate 3 Valve housing 4 Identical seal rings for ports, B, P, and 5 Mating connector, separate order, see page 8 6 Space required to remove the mating connector 7 Porting pattern according to ISO 44-3---5 8 Proportional solenoid with manual override Rzmax 4 Required surface quality of the valve contact surface Subplates and valve mounting screws see page 8
RE 975/. DRE(E); ZDRE(E) Hydraulics Bosch Rexroth G 5/8 Unit dimensions: ype DREE (dimensions in mm) 6 83 5 5 5 59 84,5 4 x 5,4H3 3,3 +, 85,5 B 4,3 5,3 +, 5 8 9 3 4 6,75 7,5 7 39,5 F F 44,5-35 F4 P B F3 6 Proportional solenoid without manual override Name plate 3 Valve housing 4 Identical seal rings for ports, B, P, and 5 Mating connector, separate order, see page 8 6 Space required to remove the mating connector 7 Porting pattern according to ISO 44-3---5 8 Proportional solenoid with manual override 9 Integrated electronics (OBE),/ Rzmax 4 Required surface quality of the valve contact surface Subplates and valve mounting screws see page 8
6/8 Bosch Rexroth G Hydraulics DRE(E); ZDRE(E) RE 975/. Unit dimensions: ype ZDRE (dimensions in mm) 5 6 max. 4 5 5 83,5 4 x Ø7,5 84,5 4 x Ø5,4H3 8 Ø,3 +, B 3 4,3 +, 4 -,3 6,75 3,5 F 7 F 8 44,5-35 B 35 F4 P F3 6,/ Rzmax 4 = component side = plate side Required surface quality of the valve contact surface Item explanations see type DRE page 4, subplates and valve mounting screws see page 8
RE 975/. DRE(E); ZDRE(E) Hydraulics Bosch Rexroth G 7/8 Unit dimensions: ype ZDREE (dimensions in mm) 6 5 5 9 83 5 5 59 84,5 4 x 5,4H3 4 x 7,5 85,5 B,3 +, 4,3 8 3,3 +, 4 6,75 3,5 F 7 F 8 44,5-35 B 35 F4 P F3 6,/ Rzmax 4 = component side = plate side Required surface quality of the valve contact surface Item explanations see type DREE page 5, subplates and valve mounting screws see page 8
8/8 Bosch Rexroth G Hydraulics DRE(E); ZDRE(E) RE 975/. Unit dimensions Hexagon socket head cap screws Material number ype DRE(E) 4x ISO 476 - M5 x 5 -.9-flZn-4h-L (Friction coefficient μ total =.9 to.4) ightening torque M = 7 Nm ± % ype ZDRE(E) 4x ISO 476 - M5 -.9-flZn-4h-L (Friction coefficient μ total =.9 to.4) ightening torque M = 7 Nm ± % Notice: he tightening torque of the hexagon socket head cap screws refers to the maximum operating pressure! Subplates Data sheet Size 6 455 ccessories (not included in the scope of delivery) Proportional amplifier for type (Z)DRE Data sheet Material number V-MSP- in modular design V-VSPD- in Euro-card format V-VSP- in Euro-card format 33 353 3 R94355 R97787 R9568 Mating connector for type (Z)DRE Data sheet Material number Mating connector (black) DIN EN 753-83 86 R97 Cable sets for type (Z)DREE Material number Cable set V-SSP-X/M//V assembled cable with straight mating connector R94656 Cable set V-SSP-X/M//V assembled cable with angular mating connector R9465 Bosch Rexroth G Hydraulics Zum Eisengießer 9786 Lohr am Main, Germany Phone +49 () 93 5 / 8- Fax +49 () 93 5 / 8-3 58 documentation@boschrexroth.de www.boschrexroth.de his document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth G. It may not be reproduced or given to third parties without its consent. he data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. he information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging.
RE 975/. DRE(E); ZDRE(E) Hydraulics Bosch Rexroth G 9/8 Bosch Rexroth G Hydraulics Zum Eisengießer 9786 Lohr am Main, Germany Phone +49 () 93 5 / 8- Fax +49 () 93 5 / 8-3 58 documentation@boschrexroth.de www.boschrexroth.de his document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth G. It may not be reproduced or given to third parties without its consent. he data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. he information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging.
/8 Bosch Rexroth G Hydraulics DRE(E); ZDRE(E) RE 975/. Bosch Rexroth G Hydraulics Zum Eisengießer 9786 Lohr am Main, Germany Phone +49 () 93 5 / 8- Fax +49 () 93 5 / 8-3 58 documentation@boschrexroth.de www.boschrexroth.de his document, as well as the data, specifications and other information set forth in it, are the exclusive property of Bosch Rexroth G. It may not be reproduced or given to third parties without its consent. he data specified above only serve to describe the product. No statements concerning a certain condition or suitability for a certain application can be derived from our information. he information given does not release the user from the obligation of own judgment and verification. It must be remembered that our products are subject to a natural process of wear and aging.