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When a plant runs at reduced system pressure for part of the cycle, the main circuit does not always suffice for pilot control. The 4WRZ25E1-220-7X/6EG24N9TK4/M therefore takes pilot oil externally and drains it internally. 220 l/min nominal flow, 18.2 kg.
Proportional Directional Valve 4WRZ25E1-220-7X/6EG24N9TK4/M - Bosch Rexroth R900977678
BOSCH REXROTH
Original product
Net price (excl. VAT)
€4,056.53
Item
BRR-R900977678
Manufacturer no.
R900977678
Personal expert advice
Brand new
Specialist dealer since 2009
Original product
Worldwide shipping
Product data
Manufacturer no.R900977678
Country of originGermany
ConditionNew
Artikel
BRR-R900977678
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Plants with a pressure-controlled pump lower system pressure during holding phases, yet pilot control still needs its minimum pressure. The 4WRZ25E1-220-7X/6EG24N9TK4/M is fed externally for that reason and controls 220 l/min nominal flow with spool symbol E1.
Benefits
- External pilot supply, the minimum pilot pressure is kept even when system pressure is lowered.
- Internal return through the tank channel, only one additional line has to be routed.
- 220 l/min nominal flow, flow up to 870 l/min, spool symbol E1 in size 25.
- 18.2 kg weight, 350 bar maximum operating pressure on the ISO 4401-08-08-0-05 pattern.
- Concealed auxiliary actuation, commanded at 24 VDC through an external amplifier.
Technical data
| Connection diagram | ISO 4401-08-08-0-05 |
| Max. flow | 870 l/min |
| Product family | 4WRZ(E) |
| Type of connection | Subplate mounting |
| Nominal flow | 220 l/min |
| Supply voltage | 24 VDC |
| Number of switching positions | 3 |
| Hydraulic fluid | HL |
| Number of ports | 4 |
| Electrical connection description | Connector, 7-pole (6 + PE) according to EN 175201-804 |
| Spool symbol | Symbol E1 |
| Operating pressure, max. | 350 bar |
| Size | 25 |
| Seals | NBR |
| Electrical connector | Connector, 3-pole (2 + PE) |
| Type of actuation | Electrical with external electronics |
| Weight | 18.2 kg |
Applications
This arrangement is found on plastics machinery and test rigs whose pump alternates between working and holding pressure. A dedicated pilot branch keeps the control loop able to work. The tank channel is enough for the drain as long as its back pressure stays within limits.
Manufacturer
Bosch Rexroth, material number R900977678. Minimum pilot pressure and permitted back pressure are given in data sheet RE 29115, range overview in RE 07600-B.
| Weight | 18.200000 |
|---|---|
| Manufacturer | Bosch Rexroth |
| Hersteller-Nr | R900977678 |
| GPSR Herstellerdaten | Bosch Rexroth AG, Zum Eisengießer 1, DE-97816 Lohr am Main, www.boschrexroth.com |
| Artikelzustand | New |
| Artikel-Authentizität | Original product |
| Country of Manufacture | Germany |
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