Product Description:
The Bosch Rexroth 4WRZ16W8-150-7X/6EG24N9EK4/D3M (R900244327) is a
cutting-edge pilot-operated proportional directional valve
engineered to deliver unmatched precision and reliability in
hydraulic flow control. As part of the renowned WRZ series, this
valve combines advanced engineering with robust construction,
making it ideal for demanding industrial, mobile, and construction
applications.
Innovative Design for Optimal Performance
Featuring a dual-stage architecture, the 4WRZ16W8 integrates a
proportional solenoid-controlled pilot valve with a spring-centered
main spool. When de-energized, the centering spring ensures the
spool remains in a neutral position, enhancing safety during system
downtime. By activating either solenoid, users can proportionally
shift the main spool via pilot oil pressure, establishing flow
paths (P-A/B-T or P-B/A-T) with progressive orifice
characteristics. This design enables seamless control of flow
direction and rate, minimizing pressure surges and optimizing
system efficiency.
Technical Advantages
- Robust Construction: Built for durability, it supports subplate
mounting with ISO-standard porting patterns, ensuring compatibility
with diverse hydraulic setups.
- Flexible Pilot Oil Supply: Pilot oil can be sourced internally via
port P or externally via port X, adapting to system requirements.
- Manual Override: An optional manual actuation feature allows
emergency operation without electrical power, though caution is
advised to prevent unintended movements.
- High Performance: Rated for maximum pressures up to 350 bar and
flows up to 150 L/min, it balances power and precision.
Engineered for Durability & Efficiency
Constructed with premium materials, the 4WRZ16W8 withstands harsh
environments and extended use. Its compatibility with mineral oils
(HL/HLP) and flame-resistant fluids (HFC) broadens its utility
across industries. While proportional spool designs inherently
allow minor internal leakage over time, adhering to ISO 4406
cleanliness standards and regular maintenance ensures prolonged
service life.
Why Bosch Rexroth Leads in Hydraulics
Backed by Bosch Rexroth’s 130+ years of innovation, this valve
offers:
- Low hysteresis (<6%) for precise positioning
- Wide operating temperature range (-20°C to +70°C)
- Compatibility with modular systems (external amplifiers required
for OBE functionality)
Ideal Applications
- Industrial machinery (presses, injection molding)
- Construction equipment (excavators, loaders)
- Mobile hydraulics (agricultural vehicles, cranes)
Maximize Your System’s Potential
The 4WRZ16W8-150-7X/6EG24N9EK4/D3M is more than a valve—it’s a
solution for achieving peak performance in critical hydraulic
systems. Whether optimizing cycle times or enhancing safety, this
model sets the standard for reliability, accuracy, and
adaptability.
4WRZQ for external pressure sensor
Technical date :
general
| Type | 4WRZ |
| Size | 10 | 16 | 25 | 32 | 52 |
| Installation position | | any, preferably horizontal |
| Ambient temperature range | °C | -20 … +70 |
| Storage temperature range | °C | -20 … +80 |
| Weight | For subplate mounting | kg | 7.8 | 11.9 | 18.2 | 42.2 | 79.5 |
| for flange connection | kg | | 77.5 |
| with "D3" | kg | 8.3 | 12.4 | 18.7 | 42.7 | 80 |
| Sine test according to DIN EN 60068-2-6 | | 10 cycles, 10…2000.. 10 Hz with logarithmic frequency changing
speed of 1 octave/min, 5 to 57 Hz, amplitude 1.5 mm (p-p), 57 to
2000 Hz, amplitude 10g, 3 axes |
| Noise test according to DIN EN 60068-2-64 | | 20…2000 Hz, amplitude 0.05g2/Hz (10gRMS) 3 axes, testing time 30
min per axis |
| Shock test according to DIN EN 60068-2-27 | | Half-sine 15g / 11 ms, 3 times in positive and 3 times in negative
direction per axis, 3 axes |
| Damp heat according to DIN EN 60068-2-30 | | Variant 2: +25 °C … +55 °C, 90 % … 97 % relative humidity, 2 cycles
á 24 hours |
hydraulic
| Size | 10 | 16 | 25 | 32 | 52 |
| Maximum operating pressure | | bar | 315 | 350 |
| Operating pressure range | External pilot oil supply | bar | 30 … 100 | 20 … 100 |
| Pilot control valve without "D3", internal pilot oil return | bar | 30 … 100 | |
| Internal pilot oil supply | bar | 100 … 315 | 100 … 350 |
| Maximum return flow pressure | Port T and R, external pilot oil return | bar | 315 | 250 | 150 | 250 |
| Port T, internal pilot oil return | bar | 30 | |
| Port Y | bar | 30 |
| Maximum flow | | l/min | 170 | 460 | 870 | 1600 | 2800 |
| Nominal flow | | l/min | 25
50
85 | 100
125
150
180 | 220
325 | 360
520 | 1000 |
| Pilot flow | input signal 0 → 100% | Port X and Y | l/min | 3.5 | 5.5 | 7 | 15.9 | 7 |
| Pilot volume | switching process 0 → 100% | cm³ | 1.7 | 4.6 | 10 | 26.5 | 54.3 |
| 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) | Pilot control valve | | Class 18/16/13 according to ISO 4406 (c) |
| Main valve | | Class 20/18/15 according to ISO 4406 (c) |
| Hysteresis | | % | ≤ 6 |
| 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. |
electrical
| Size | 10 | 16 | 25 | 32 | 52 |
| Voltage type | | Direct voltage |
| Command value overlap | | % | 15 |
| Maximum solenoid current | | A | 1.5 |
| Solenoid coil resistance | Cold value at 20 °C | Ω | 4.8 |
| Maximum hot value | Ω | 7.2 |
| Actuated time | | % | 100 |
| Maximum coil temperature 1) | | °C | + 150 |
| Protection class according to DIN EN 60529 | | IP65 (with mating connector mounted and locked) |
| Power supply | | V | 24 |
| Supply voltage range | | V | 19.4 … 35 |
| 1) | Due to the surface temperatures occurring at the solenoid coils,
the European standards ISO 13732-1 and EN 982 need to be adhered
to. |
| 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:
Maximum pressure differential per control edge 175 bar
Pressure pre-loading at the tank port > 20 % of the pressure
differential, otherwise increased cavitation
Life cycle as compared to operation with mineral oil HL, HLP 50 %
to 100 % |
For applications outside these parameters, please consult us!
