Артикул: RX7688
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Proportional pressure relief valve, direct operated DBET
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Надежность
Профессиональная поддержка
Description
- Size 6
- Component series 1X
- Maximum operating pressure 350 bar
- Maximum flow 2 l/min
Features
- For subplate mounting
- Porting pattern according to ISO 4401-03-02-0-05
- Proportional solenoid operation
- Proportional solenoid with central thread and detachable coil
- External control electronics:
- Amplifier in modular design or as plug-in amplifier
- Individually adjustable upwards and downwards ramp
- Fine adjustment of the command value pressure characteristic curve possible
Product description
General information
Proportional pressure relief valves of type DBET are remote control valves with seat design and are used for system pressure limitation. Operation by means of a proportional solenoid with central thread and detachable coil. The interior of the solenoid is connected to port T and is filled with the hydraulic fluid. Dependent on the electric command value, these valves can be used to steplessly set the system pressure to be limited.
The valves basically consist of housing (1), proportional solenoid (2), valve seat (3), valve poppet (4), compression spring (6) and nozzle (7).
Basic principle
For the setting of the system pressure, a command value is specified at the external control electronics. Dependent on the command value, the electronics actuate the solenoid coil with electric current. The proportional solenoid converts the electric current into mechanical force that acts on the valve poppet (4) via the armature plunger (5) and the compression spring (6). The valve poppet (4) pushes onto the valve seat (3) and blocks the connection between port P and T. If the hydraulic force which acts on the valve poppet (4) is equal to the solenoid force, the valve regulates the set pressure by lifting the valve poppet (4) from the valve seat (3) and thereby letting hydraulic fluid flow from port P to T or Y. If the command value is zero, the external control electronics only apply the minimum control current to the proportional solenoid (2) and the minimum set pressure is set.
Type code
| 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | ||
| DBET | ‒ | 1X | / | H | G24 | -8 | K4 | * |
| 01 | Proportional pressure relief valve | DBET |
| 02 | Component series 10 ... 19 (10 ... 19: unchanged installation and connection dimensions) | 1X |
| Maximum pressure rating | ||
| 03 | 50 bar | 50 |
| 180 bar | 180 | |
| 315 bar | 315 | |
| 04 | Standard solenoid | H |
| 05 | Direct voltage 24 V | G24 |
| 06 | 800 mA coil | -8 |
| Electrical connection | ||
| 07 | 3-pole connector (2+PE) according to DIN EN 175301-803 | K4 1) |
| Seal material | ||
| 08 | NBR seals | M |
| FKM seals | V | |
| Observe compatibility of seals with hydraulic fluid used. (Other seals upon request) | ||
| 09 | Further details in the plain text | * |
| 1) | Mating connectors, separate order, see "Accessories" and datasheet 08006. |
Technical data
general
| Type | DBET | |
| Size | 6 | |
| Weight | kg | 1.57 |
| Installation position | any | |
| Ambient temperature range | °C | -20 … -70 |
| MTTFD values according to EN ISO 13849 | Years | 150 |
hydraulic
| Type | DBET | ||
| Maximum operating pressure | Port P | bar | 350 |
| Maximum set pressure | Pressure rating 50 bar | bar | 50 |
| Pressure rating 180 bar | bar | 180 | |
| Pressure rating 315 bar | bar | 315 | |
| Minimum set pressure | at a command value of 0 | See characteristic curves | |
| Return flow pressure | Port T | separate and depressurized to the tank | |
| Maximum flow 1) | l/min | 2 | |
| Hydraulic fluid | see table "Hydraulic fluid" | ||
| Hydraulic fluid temperature range | °C | -20 … +80 | |
| Viscosity range | Maximum | mm²/s | 20 … 380 |
| preferably | mm²/s | 30 … 46 | |
| Maximum admissible degree of contamination of the hydraulic fluid, cleanliness class according to ISO 4406 (c) 2) | Class 20/18/15 | ||
| Hysteresis 3) | % | < 7 | |
| Range of inversion 3) | % | < 0.5 | |
| Response sensitivity 3) | % | < 0.5 | |
| Linearity 3) | Flow 0.8 l/min | % | ± 3.5 |
| Manufacturing tolerance of the command value pressure characteristic curve 4) | % | + 20 | |
| Step response | 10% → 90% 5) | ms | 90 |
| 90% → 10% 5) | ms | 90 | |
| 1) | Observe flow limitation for pressure ratings 315 bar (see characteristic curves). |
| 2) | 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. |
| 3) | Of the maximum set pressure |
| 4) | Of the maximum set pressure; related to 0.8 l/min and command value 100%; pressureincreasing. Possible comparison of the external controlelectronics. |
| 5) | Line volume < 20 cm3; qV = 0.8 l/min; depending on the system |
electrical
| Type | DBET | ||
| Minimum solenoid current | mA | 0 | |
| Maximum solenoid current | mA | 800 | |
| Solenoid coil resistance | Cold value at 20 °C | Ω | 19.25 |
| Maximum hot value | Ω | 32 | |
| Duty cycle | % | 100 | |
| Hydraulic fluid | Classification | Suitable sealing materials | Standards | Data sheet | |
| Mineral oils | HL, HLP | NBR, FKM | DIN 51524 | 90220 | |
| Bio-degradable | Insoluble in water | HETG | NBR, FKM | ISO 15380 | 90221 |
| HEES | FKM | ||||
| Soluble in water | HEPG | FKM | ISO 15380 | ||
| Flame-resistant | Water-free | HFDU (glycol base) | FKM | ISO 12922 | 90222 |
| HFDU (ester base) | FKM | ||||
| HFDR | FKM | ||||
| Containing water | HFC (Fuchs Hydrotherm 46M, Petrofer Ultra Safe 620) | NBR | ISO 12922 | 90223 | |
| Important information on hydraulic fluids:
| |||||
Diagrams/characteristic curves
(measured with HLP46, ϑOil = 40 ±5 °C)
Pressure in port P dependent on the command value
Rated flow 0.8 l/min
Pressure in port P dependent on the flow
Pressure rating 50 bar
Pressure rating 180 bar
Pressure rating 315 bar
Notice:
With a pressure rating of 315 bar, the command value must not exceed the maximum flow of 1.4 l/min.
Minimum set pressure in port P dependent on the flow (command value 0 mA)
Pressure rating 50 bar
Pressure rating 180 bar
Pressure rating 315 bar
Notice:
The characteristic curves apply to the pressure at the valve output pT = 0 bar across the entire flow range.
Symbols/Circuit diagrams
Electrical connection
Mating connector
Connector
Dimensions
 |
| Required surface quality of the valve contact surface |
| 1 | Proportional solenoid |
| 2 | Valve housing |
| 3 | Name plate |
| 4 | Identical seal rings for ports A, B, P, and T |
| 5 | Mating connectors, separate order, see "Accessories" |
| 6 | Space required to remove the mating connector |
| 7 | Blind counterbores A and B |
| 8 | Machined valve contact surface; porting pattern according to ISO 4401-03-02-0-05 |
Valve mounting screws (separate order)
| Size | Quantity | Hexagon socket head cap screws | Material number |
| 6 | 4 | ISO 4762 - M5 x 45 - 10.9-CM-Fe-ZnNi-5-Cn-T0-H-B Tightening torque MA = 7 Nm ±10 % | R913048087 |
Notice:
The tightening torque of the hexagon socket head cap screws refers to the maximum operating pressure.
Accessories
Valve amplifier for proportional valves without electrical position feedback
VT-MSPA
Valve amplifier for proportional valves without electrical position feedback
VT-MSPA
- Component series 2X
- Suitable for controlling proportional valves and pump controls without electric position feedback
- Easy valve selection of the Rexroth valves for the industrial hydraulics
- Characteristic curves of the valves stored in the device
- Valve optimization via push-buttons
Valve amplifiers for proportional pressure valves
VT-SSPA1-1-1X
Valve amplifiers for proportional pressure valves
VT-SSPA1-1-1X
- Component series 1X
- Analog, Connector design
- For valves: DBET, DRE, DBEM...7x
Valve amplifiers for proportional directional valves and proportional pressure valves
VT-SSPA1-150-1X
Valve amplifiers for proportional directional valves and proportional pressure valves
VT-SSPA1-150-1X
- Component series 1X
- Analog, Connector design
- For valves: universal, 0.8 A
Mating connectors for valves with connector “K4”, without circuitry, standard
3P Z4
Mating connectors for valves with connector “K4”, without circuitry, standard
3P Z4
- For valves with connector “K4” according to EN 175301-803 and ISO 4400, 2-pole + PE, “large cubic connector”
- Mating connectors for valves with one or two solenoids (individual connection)
Ordering codes
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