Артикул: RX7604
4/2 and 4/3 proportional directional valves, direct operated, wit electrical position feedback, without integrated electronics (OBE) 4WRE
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Description
- Size 6
- Component series 2X
- Maximum operating pressure 315 bar
- Maximum flow 80 l/min
Features
- Direct operated proportional directional valve with electrical position feedback and external electronics
- Control of flow direction and size
- Operation by means of proportional solenoids with central thread and detachable coil
- For subplate mounting: Porting pattern according to ISO 4401
- Spring-centered control spool
Product description
Type 4WRE...-2X/...
The 4/2 and 4/3 proportional directional valves are designed as direct operated devices in plate design. Operation by means of proportional solenoids with central thread and detachable coil. The solenoids are controlled by external electronics.
Set-up:
The valve basically consists of:
- Housing (1) with connection surface
- Control spool (2) with compression springs (3 and 4) and spring plates (5 and 6)
- Solenoids (7 and 8) with central thread
- Position transducer (9)
- With de-energized solenoids (7 and 8), central position of the control spool (2) due to compression springs (3 and 4) between the spring plates (5 and 6)
- Direct actuation of the control spool (2) by the control of one proportional solenoid, e. g. solenoid "b" (8)
- Control spool (2) is moved to the left in proportion to the electrical input signal
- Connection from P to A and B to T via orifice-type cross-sections with progressive
- flow characteristics
- Switching off of the solenoid (8)
- Control spool (2) is returned to the central position by the compression spring (3)
Function:
In the de-energized state, the control spool (2) is held in a mechanical central position by the return spring of the solenoids. With control spool symbol "V", this position does not correspond to the hydraulic central position! When the electric valve control loop is closed, the control spool is positioned in the hydraulic central position.
Important notice:
The PG fitting (11) must not be opened. Mechanical adjustment of the adjustment nut located below is prohibited and damages the valve!
Valve with two spool positions: (Type 4WRE…A...)
The function of this valve version basically corresponds to the valve with three spool positions. The 2 spool position valve is, however, only equipped with solenoid “a” (7). Instead of the 2nd proportional solenoid, a plug screw (10) is installed.
Notice:
Due to the design principle, internal leakage which may increase over the life cycle is inherent to the valves.
Notice:
The tank line must not be allowed to run empty. With corresponding installation conditions, a preload valve (preload pressure approx. 2 bar) must be installed.
Type code
| 01 | 02 | 03 | 04 | 05 | 06 | 07 | 08 | 09 | 10 | |||
| 4 | WRE | ‒ | 2X | / | G24 | K4 | / | * |
| 01 | 4 main ports | 4 |
| 02 | Proportional directional valve with electrical position feedback | WRE |
| 03 | Size 6 | 6 |
| Size 10 | 10 | |
| 04 | Symbols; for the possible version, see "Symbols/Circuit diagrams" | E; E1-; V; V1-; W; W1-; EA; WA |
| Rated flow NG6 | ||
| 05 | 4 l/min | 4 |
| 8 l/min | 8 | |
| 16 l/min | 16 | |
| 32 l/min | 32 | |
| Rated flow NG10 | ||
| 05 | 25 l/min | 25 |
| 50 l/min | 50 | |
| 75 l/min | 75 | |
| 06 | Component series 20 ... 29 (20 ... 29: unchanged installation and connection dimensions) | 2X |
| 07 | Supply voltage 24 V | G24 |
| Electrical connection | ||
| 08 | Connector DIN EN 175301-803 | K4 |
| Seal material | ||
| 09 | NBR seals | M |
| FKM seals | V | |
| 10 | Further details in the plain text | * |
Technical data
general
| Type | 4WRE | |
| Size | 6 | |
| Installation position | any, preferably horizontal | |
| Ambient temperature range | °C | -20 … +70 |
| Storage temperature range | °C | -20 … +80 |
| Weight | kg | 2.2 |
| MTTFD values according to EN ISO 13849 1) | y | 150 |
| 1) | With control spool types E, E1, EA, W, W1, WA; in longitudinal control spool direction, there is sufficient positive overlap without shock/vibration load; observe the installation orientation with regard to the main direction of acceleration. |
hydraulic
| Size | 6 | ||
| Maximum operating pressure | bar | 315 | |
| Maximum operating pressure | Port P | bar | 315 |
| Port T | bar | 210 | |
| Anschluss A | bar | 315 | |
| Port B | bar | 315 | |
| Maximum flow | l/min | 80 | |
| Nominal flow | l/min | 4 8 16 32 | |
| Hydraulic fluid | see table below | ||
| Hydraulic fluid temperature range | °C | -20 … +80 | |
| preferably | °C | +40 … +50 | |
| Viscosity range | 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) 1) | Class 20/18/15 according to ISO 4406 (c) | ||
| Hysteresis | % | ≤ 0.1 | |
| Range of inversion | % | ≤ 0.05 | |
| Response sensitivity | % | ≤ 0.05 | |
| Zero shift upon change of | Hydraulic fluid temperature | %/10 K | ≤ 0.15 |
| Operating pressure | %/100 bar | ≤ 0.1 | |
| 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 |
| Flame-resistant - containing water | HFC (Fuchs HYDROTHERM 46M, Petrofer Ultra Safe 620) | NBR | ISO 12922 |
| Important information on hydraulic fluids: For more information and data on the use of other hydraulic fluids please contact us. There may be limitations regarding the technical valve data (temperature, pressure range, life cycle, maintenance intervals, etc.). The flash point of the process and operating medium used must be 40 K over the maximum solenoid surface temperature. Flame-resistant - containing water: | |||
electrical
| Size | 6 | ||
| Voltage type | Direct voltage | ||
| Maximum current consumption | of the amplifier | A | 2 |
| of the amplifier (impulse current) | A | 3 | |
| Solenoid coil resistance | Cold value at 20 °C | Ω | 2.65 |
| Maximum hot value | Ω | 4.05 | |
| Actuated time | % | 100 | |
| Maximum coil temperature 1) | °C | 150 | |
| Protection class according to DIN EN 60529 | IP65 (If a suitable and a correctly mounted mating connector are used.) | ||
| Power supply | V | 24 | |
| Supply voltage range | V | 19,4 … 35 | |
| 1) | Due to the surface temperatures occurring at solenoid coils, the European standards ISO 13732-1 and ISO 4413 need to be adhered to. |
Diagrams/characteristic curves
(measured with HLP46, ϑÖl = 40 ±5 °C)
Zero flow with central control spool position “V32”
NG6
Rated flow 4 l/min at a valve pressure differential of 10 bar
NG6
Rated flow 8 l/min at a valve pressure differential of 10 bar
NG6
Rated flow 16 l/min at a valve pressure differential of 10 bar
NG6
Rated flow 32 l/min at a valve pressure differential of 10 bar
NG6
Load function with maximum valve opening;Rated flow 4, 8, 16 and 32 l/min;Control spool V
NG6
Symbols/Circuit diagrams
Symbols
| With symbol E1-, V1- and W1-, the following applies: | |
| P → A: qvmax | B → T: qv/2 |
| P → B: qv/2 | A → T: qvmax |
| Notice: | |
Electrical connection
Connection at connector
Connection at mating connector
Inductive position transducer
Dimensions
4WRE 6
Dimensions in mm
| 1 | Valve housing |
| 2 | Proportional solenoid "a" with inductive position transducer |
| 3 | Proportional solenoid "b" |
| 4 | Mating connector "A", color gray, separate order |
| 5 | Mating connector "B", color black, separate order |
| 6 | Mating connector for inductive position transducer, separate order |
| 7 | Plug screw for valves with one solenoid (2 spool positions, version "EA" or "WA") |
| 8 | Identical seal rings for ports A, B, P, and T |
| 9 | Space required to remove the mating connector |
| 10 | Name plate |
| 11 | Machined valve contact surface; Porting pattern according to ISO 4401-03-02-0-05 (with locating hole) |
Recommended valve mounting screws (separate order):
4 hexagon socket head cap screws ISO 4762 - M5 x 50 - 10.9-flZn-240h-L
tightening torque MA = 7 Nm ± 10%, material no. R913000064 or
4 hexagon socket head cap screws ISO 4762 - M5 x 50 - 10.9
tightening torque MA = 8.9 Nm ± 10%
| 1 | Valve housing |
| 2 | Proportional solenoid "a" with inductive position transducer |
| 3 | Proportional solenoid "b" |
| 4 | Mating connector "A", color gray, separate order |
| 5 | Mating connector "B", color black, separate order |
| 6 | Mating connector for inductive position transducer, separate order |
| 7 | Plug screw for valves with one solenoid (2 spool positions, version "EA" or "WA") |
| 8 | Identical seal rings for ports A, B, P and T (T1) |
| 9 | Space required to remove the mating connector |
| 10 | Name plate |
| 11 | Machined valve contact surface; Porting pattern according to ISO 4401-05-04-0-05 |
Accessories
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)
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