Артикул: RX7677
Pressure reducing valve with DC motor actuation, pilot-operated DRG_G
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Description
- Size 8, 10, 16, 20, 25, 32
- Component series 1X
- Max. operating pressure 315 bar
- Flow, max. 300 l/min
Features
- Operation via DC motor with speed reduction transmission
- For threaded connection
- 4 pressure ratings
- With actual value potentiometer or limit switch
- Check valve, optional
- Self-locking in case of power failure
Product description
Pressure valves of type DRG are pilot-operated pressure reducing valves. They are used for reducing a system pressure. The pressure reducing valves from this series mainly consist of a pilot control valve with electric motor as pressure adjustment element, a main valve with main spool insert and an optional check valve. The reduced pressure in A is set by means of a DC motor (6) with speed reduction transmission (7). The output shaft of the speed reduction transmission (7) turns the cam (5) that adjusts the preload of the spring (5) via the spring plate (9) to cause a pressure change. The reduced pressure is present in port A and the inlet pressure in port B. The main flow is from B to A. The cam position (5) is reported back by the actual value potentiometer (8). Optionally, electric limit switches can be installed instead of the actual value potentiometer (8) to limit the min. and max. pressure. For the version with limit switch, the min. adjustment time is 8 seconds for the pressure range pmin to pmax. The adjustment time of 8 seconds facilitates a sensitive start-up of the desired pressure in jog mode. For the version with actual value potentiometer, the min. adjustment time is 3 seconds for the pressure range pmin to pmax. Together with the corresponding amplifier type VT-VRM, program control is possible. With 2 additional pressure switches, the min. and max. pressure can be limited. If the energy supply is interrupted (cable break, fuse defect, short-circuit, etc.), the pressure set at the valve remains unchanged for the version with limit switch.
Type DRG NG8 and 10
The reduced pressure in A is simultaneously applied to the spring-loaded side of the main spool (1) via nozzle (2.1), control line (4), nozzle (2.2) and nozzle (3). The pressure on the spring-loaded side of the main spool (1) is lower than the pressure in A by the pressure drop of the compression spring (10.2). The compression spring (10.2) acts in opening direction on the main spool (1). Depending on the cross-section of the nozzles (2.1; 2.2.) and the pressure drop of the compression spring (10.2), the pilot oil flows via nozzle (2.1), control line (4), nozzle (2.2), poppet (6) into the spring chamber (7) and then back to the tank via Y, with subplate mounting (12.2), with threaded connection (12.1). If the pressure in A exceeds the pressure set at the pilot control valve (11), the main spool (1) reduces the flow cross-section from B to A until the pressure set at the pilot control valve (11) is reached again in port A. Correspondingly, the main spool (1) opens the flow cross-section B to A if the pressure in A is lower than the pressure set at the pilot control valve (11). With standing oil column between A and the actuator, only the pilot oil flows from B to A via the main spool. If a lower pressure is set at the pilot control valve (11) in this position, the main spool (1) interrupts the pilot oil supply from B to A until the oil volume between A and the actuator has expanded to the lower pressure in the pilot control valve (11) via nozzle (2.1), control line (4), nozzle (2.2), poppet (6) and port Y.For the free return flow from A to B, a check valve (14) can optionally be installed.
Type DRG NG16 to 32
In contrast to DRG 8 and DRG 10, the pilot oil is taken from the inlet pressure in channel B with these valves. The flow controller (13) regulates the pilot oil volume to a constant level. If with standing oil column between A and actuator, a lower pressure is set at the pilot control valve (11), the oil column is unloaded via check valve (10.1), control line (4), poppet (6) and port Y.
Type code
| 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | ||
| DRG | G | ‒ | 1X | / | Y | * |
| 01 | Proportional pressure reducing valve with DC motor actuation | DRG |
| Size for threaded connection | ||
| 02 | 8(G3/8) | 8 |
| 10(G1/2) | 10 | |
| 16(G3/4) | 15 | |
| 20(G1) | 20 | |
| 25(G11/4) | 25 | |
| 32(G11/2) | 30 | |
| 03 | For threaded connection | G |
| 04 | Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions) | 1X |
| Pressure rating | ||
| 05 | Set pressure up to 50 bar | 50 |
| Set pressure up to 100 bar | 100 | |
| Set pressure up to 200 bar | 200 | |
| Set pressure up to 315 bar | 315 | |
| Pilot flow | ||
| 06 | Pilot oil supply and return | Y |
| 07 | With check valve | no code |
| Without check valve | M | |
| Seal material | ||
| 08 | NBR seals | no code |
| FKM seals | V | |
| Observe compatibility of seals with hydraulic fluid used. (Other seals upon request) | ||
| 09 | Limit switch | E1 |
| Actual value potentiometer | P2 | |
| 10 | Further details in the plain text | * |
Technical data
general
| Type | DRG_G | ||||||
| Size | 8 | 10 | 16 | 20 | 25 | 32 | |
| Component series | 1X | ||||||
| Installation position | Any | ||||||
| Weight | kg | 8.4 | 9.5 | 10.4 | |||
| Ambient temperature range | °C | -20 … +50 | |||||
hydraulic
| Type | DRG_G | |||||||
| Size | 8 | 10 | 16 | 20 | 25 | 32 | ||
| Maximum inlet pressure | Port B | bar | 315 | |||||
| Maximum controllable output pressure port A | Pressure rating 50 bar | bar | 50 | |||||
| Pressure rating 100 bar | bar | 100 | ||||||
| Pressure rating 200 bar | bar | 200 | ||||||
| Pressure rating 315 bar | bar | 315 | ||||||
| Pressure rating 400 bar | bar | 400 | ||||||
| Maximum counter pressure | Port Y | bar | 10 | |||||
| Maximum operating pressure | bar | 315 | ||||||
| Maximum operating pressure | Port B | bar | 315 | |||||
| Pilot flow | l/min | 0.5 | 1.3 | |||||
| Maximum flow | l/min | 80 | 200 | 300 | ||||
| Hydraulic fluid | see table | |||||||
| Hydraulic fluid temperature range | °C | -20 … +70 | ||||||
| Viscosity range | mm²/s | 2.8 … 380 | ||||||
| Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 1) | Class 20/18/15 according to ISO 4406 (c) | |||||||
| 1) | The cleanliness classes specified for the components must be adhered to in hydraulic systems. Effective filtration prevents faults and simultaneously increases the life cycle of the components. For the selection of the filters, see www.boschrexroth.com/filter. |
| Hydraulic fluid | Classification | Suitable sealing materials | Standards |
| Mineral oils and related hydrocarbons | HL, HLP | NBR / FKM | DIN 51524 |
| Bio-degradable - insoluble in water |
HEES |
FKM |
VDMA24568 |
|
HETG | NBR / FKM | ||
|
HEPG |
FKM | ||
| For more information and data on the use of other hydraulic fluids please contact us. | |||
electrical
| Type | DRG_G | ||
| Voltage type | Direct voltage | ||
| Power supply | Nominal voltage | V | 24 |
| Nominal power | with limit switch | W | 18 |
| with actual value potentiometer | W | 24 | |
| Protection class according to DIN EN 60529 | IP65 (If a suitable and a correctly mounted mating connector are used.) | ||
Symbols/Circuit diagrams
DRG..-1X/..Y..M DRG..G-1X/..Y.. DRGC10-1X/..Y.. DRGC30-1X/..Y..
Electrical connection
Connector connection at the DBG / DRG valve with actual value potentiometer
Connector connection at the DBG / DRG valve with end switch
Switching example: DBG / DRG valve with end switch
Dimensions
| 1 | Pilot control valve |
| 2 | DC motor |
| 3 | Constant-current control (with NG16 to 32 only) |
| 4 | “Y” port for “external” pilot oil return |
| 5 | Port X for remote control with NG8 and 10 Port M for pressure gauge with NG16 to 32 |
| 6 | Name plate |
| 7 | Mating connector |
| 8 | Space required to remove the mating connector |
| 11 | Valve mounting bores |
| Size | 8 | 10 | 16 | 20 | 25 | 32 | ||
| B1 | mm | 63 | 70 | |||||
| ØD1 | mm | 9 | 11 | |||||
| H1 | mm | 362 | 392 | 405 | ||||
| H2 | mm | 23 | 28 | 34 | ||||
| H3 | mm | 75 | 85 | |||||
| H4 | mm | 115 | 145 | 158 | ||||
| L1 | mm | 108 | 111 | |||||
| L2 | mm | 40 | 46 | |||||
| L3 | mm | 62 | 72 | |||||
| L4 | mm | 90 | 99 | |||||
| T1 | mm | 12 | 14 | 16 | 18 | 20 | 22 | |
Notice:
The dimensions are nominal dimensions which are subject to tolerances.
Downloads
 | Pressure reducing valve with DC motor operation, pilot operated Data Sheet | RE29145 | 2007-06-01 | English | PDF | 293k Product Groups: Pilot operated |
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