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As the oil warms up in service its viscosity changes, and with it the opening of an uncontrolled valve. The internal position control of this 4WRTE holds that opening fixed, at 350 l/min nominal flow and 350 bar. Pilot oil is supplied and returned externally.
Proportional Directional Valve 4WRTE25W8-350L-4X/6EG24K31/F1M - Bosch Rexroth R901076888
BOSCH REXROTH
Original product
Net price (excl. VAT)
€6,767.36
Item
BRR-R901076888
Manufacturer no.
R901076888
Personal expert advice
Brand new
Specialist dealer since 2009
Original product
Worldwide shipping
Product data
Manufacturer no.R901076888
Country of originGermany
ConditionNew
Artikel
BRR-R901076888
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Between cold start and continuous duty the viscosity of the oil changes noticeably, and an uncontrolled valve shows that as drift. This 4WRTE holds the spool position through an internal control loop while delivering 350 l/min nominal flow at 350 bar.
Benefits
- Internal position control compensates the influence of viscosity and flow forces.
- 350 l/min nominal flow, up to 870 l/min maximum, at 350 bar operating pressure.
- Fully external pilot routing for plants with their own filtered pilot circuit.
- 4...20 mA command with live zero, so a broken line is detected at once.
- On-board electronics at the valve, 24 VDC supply, weight 18.04 kg.
Technical data
| Connection diagram | ISO 4401-08-08-0-05 |
| Max. flow | 870 l/min |
| Product family | 4WRTE |
| Type of connection | Subplate mounting |
| Nominal flow | 350 l/min |
| Supply voltage | 24 VDC |
| Connectivity | Analog, command value 4...20 mA |
| Number of switching positions | 3 |
| Hydraulic fluid | HL |
| Number of ports | 4 |
| Electrical connection | Connector 7-pole (6 + PE) according to EN 175201-804 |
| Spool symbol | Symbol W8 |
| Operating pressure, max. | 350 bar |
| Size | 25 |
| Seals | NBR |
| Electrical connector | Connector, 7-pole (6 + PE) |
| Type of actuation | Electrical with on-board electronics |
| Weight | 18.04 kg |
Applications
The valve is used on plants with strongly varying oil temperature, such as power units installed outdoors, forging equipment and test benches with long breaks between cycles. The ISO 4401-08-08-0-05 interface corresponds to size 25. Sealing is NBR for HL hydraulic fluid.
Manufacturer
Genuine Bosch Rexroth part, material number R901076888.
| Hersteller-Nr | R901076888 |
|---|---|
| Manufacturer | Bosch Rexroth |
| Country of Manufacture | Germany |
| Weight | 18.040000 |
| GPSR Herstellerdaten | Bosch Rexroth AG, Zum Eisengießer 1, DE-97816 Lohr am Main, www.boschrexroth.com |
| Artikel-Authentizität | Original product |
| Artikelzustand | New |
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