Артикул: RX7706
Pressure relief valves with direct current motor operation, pilot operated DBGC30
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Description
- Component series 1X
- Max. operating pressure 315 bar
- Flow, max. 600 l/min
Features
- Operation via DC motor with speed reduction transmission
- For block installation
- 4 pressure ratings
- With actual value potentiometer or limit switch
- Self-locking in case of power failure
Product description
Pressure valves of type DBG are pilot-operated pressure relief valves. They are used for system pressure limitation. The pressure relief valves from this series mainly consist of a pilot control valve with electric motor as pressure adjustment element and main valve with main spool insert. The system pressure is set by means of a DC motor (16) with speed reduction transmission (17). The output shaft of the speed reduction transmission (17) turns the cam (14) that tensions the spring (8) via the spring plate (15) and thereby causes a pressure change. The pressure applied to channel A acts on the main spool (1.1). Simultaneously, pressure is applied to the spring-loaded side of the main spool (1.1) and to the pilot poppet (6) in the pilot control valve (7) via the control lines (4) and (5) which are equipped with nozzles (2.1, 2.2) and (3). If the system pressure exceeds the value set at the spring (8), the pilot poppet (6) opens. The signal for this is provided internally - with type DBG..–1X/.. via the control lines (12) and (4) from channel A; or externally – with type DBG..–1X/..X (XY) via the connection (13) and the control line (4). The pilot oil now flows via nozzle (2.1), control line (4), nozzle (2.2) and pilot poppet (6) into the spring chamber. From here, it is fed into the tank, either internally – with type DBG..–1X/.. via control line (10), or externally – with type DBG..–1X/..Y (XY) via control line (11). The compression spring (1.2) acts on the main spool (1.1) in closing direction, i. e. there is a pressure drop between side “A” and the spring-loaded side of the main spool (1.1). The flowing pilot oil volume is determined by the cross-section of the nozzles (2.1, 2.2) and by the pressure drop at the main spool (1.1). When the pressure in “A” has increased by the pressure drop at the main spool (1.1) in relation to the cracking pressure at the pilot poppet (6), the main spool (1.1) opens from “A” to “B”. The oil now flows from channel “A” to channel “B”, whilst the set operating pressure is maintained. The cam position (14) is reported back by the actual value potentiometer (18). Optionally, electric end switches can be installed instead of the actual value potentiometer (18) to limit the min. and max. pressure. For the version with limit switch, the min. adjustment time is 12 seconds for the pressure range pmin to pmax. The adjustment time of 12 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 0.65 seconds for the pressure range pmin to pmax. The integrated amplifier type VT-VRM1-1 enables program control. 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 adjusted at the valve remains unchanged for the version with limit switch.
Type code
| 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | ||
| DBG | C30 | - | 1X | / | * |
| 01 | Pressure relief valve with DC motor actuation | DBG |
| 02 | Pilot control valve with main spool insert | C30 |
| 03 | Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions) | 1X |
| Pressure rating | ||
| 04 | 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 | ||
| 05 | Pilot oil supply internal, pilot oil return internal | no code |
| External pilot oil supply, internal pilot oil return | X | |
| Internal pilot oil supply, external pilot oil return | Y | |
| External pilot oil supply, external pilot oil return | XY | |
| Seal material | ||
| 06 | NBR seals | no code |
| FKM seals | V | |
| Observe compatibility of seals with hydraulic fluid used. (Other seals upon request) | ||
| 07 | Limit switch | E1 |
| Actual value potentiometer | P2 | |
| 08 | Further details in the plain text | * |
Technical data
general
| Type | DBGC30 | |
| Size | ||
| Component series | 1X | |
| Installation position | any | |
| Earth | kg | 5.4 |
| Ambient temperature range | °C | -20 … +50 |
hydraulic
| Maximum operating pressure | bar | 315 | |
| Anschluss A | bar | 315 | |
| Port B (internal pilot oil return) | bar | 10 | |
| Port B (external pilot oil return) | bar | 315 | |
| Port X | bar | 315 | |
| Port Y | bar | 10 | |
| Maximum set pressure | Pressure rating 25 bar | bar | 50 |
| Pressure rating 50 bar | bar | 100 | |
| Pressure rating 100 bar | bar | 200 | |
| Pressure rating 200 bar | bar | 315 | |
| Minimum set pressure | qv dependent (see characteristic curves) | ||
| Maximum flow | l/min | 600 | |
| Pilot flow | l/min | 1 | |
| 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
| ||
| Important information on hydraulic fluids!
Bio-degradable: | |||
electrical
| Type | DBGC30 | |
| Voltage type | Direct voltage | |
| Power supply | V | 24 |
| Nominal power with limit switch | W | 18 |
| Nominal power 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.) | |
Control in jog mode with limit switch: Ordering code “E1”
| Adjustment time, pmin ... pmax | s | 12 | |||||
| Limit switch version: | Microswitch | 30 V; 2 A DC | |||||
| electric load | 250 V; 5 A AC | ||||||
| Pressure overrun: | Pressure rating | bar | 50 | 100 | 200 | 315 | 400 |
| without short-circuit bridge | bar | 1 | 2,5 | 5 | 7,5 | 10 | |
| with short-circuit bridge | bar | 0,5 | 1 | 1,5 | 2 | 2,5 | |
Adjustment with actual value potentiometer for cam position feedback: Ordering code “P2”
| Adjustment time, pmin ... pmax | s | 0,65 | |||||
| Potentiometer | Resistance | kΩ | 5 | ||||
| Power | W | 1,75 | |||||
| Adjustment hysteresis: breakout pressure - variation > 10 bar from nominal pressure | |||||||
| Pressure rating | bar | 50 | 100 | 200 | 315 | 400 | |
| Hysteresis | bar | < 0,5 | < 1 | < 2,5 | < 4 | < 5 | |
| Adjustment hysteresis: breakout pressure - variation > 20 bar from nominal pressure | |||||||
| Pressure rating | bar | 50 | 100 | 200 | 315 | 400 | |
| Hysteresis | bar | < 0,3 | < 0,5 | < 1 | < 1,5 | < 2 | |
| Repetition accuracy | bar | < 0,5 | < 1 | < 1,3 | < 1,7 | < 2 | |
| Valve amplifiers | |||||||
| Electric amplifier | VT-VRM1-1-1X | ||||||
Diagrams/characteristic curves
(measured at ν = 36 mm²/s and ϑOil = 50 °C)
Inlet pressure dependent on the flow; NG10
Size 10
Minimum set pressure dependent on the flow; NG 10
Size 10
Inlet pressure dependent on the flow; NG32
Size 32
Minimum set pressure dependent on the flow; NG 32
Size 32
Symbols/Circuit diagrams
DBG..-1X/..Y.. DBG..G-1X/..Y.. DBGC30-1X/..
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 | “Y” port for “external” pilot oil return |
| 5 | Name plate |
| 6 | Mating connector |
| 9 | Space required to remove the mating connector |
| 10 | Valve mounting bores |
| 11 | Main spool insert |
| 12 | O-ring 27.3 x 2.4 |
| 13 | O-ring 9.25 x 1.78 |
| 14 | Support ring 32/28.4 x 0.8 |
Recommended valve mounting screws (separate order):
4 hexagon socket head cap screws ISO 4762 - M8 x 50 - 10.9-flZn-240h-L
Tightening torque MA = 31 Nm ± 10%; material no. R913000543
| NG | ØD1 | ØD2 | ØD3 |
| 10 | 10 | 40 | 10 |
| 32 | 32 | 45 | 32 |
| 15 | Bore ØD3 can cut into ØD2 at any position. However, it must be observed that the connection bore X and the mounting bore are not damaged. |
| 16 | Support ring and O-ring are to be inserted into this bore before the assembly of the main spool. |
| 17 | Installation kit includes nozzle and main spool insert |
| 18 | Depth of fit |
Ordering codes
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 | Pressure relief valve with DC motor operation, pilot operated Data Sheet | RE29139 | 2007-06-01 | English | PDF | 285k Product Groups: Pilot operated |
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