R900704477 4WRZ25W8-325-7X/6EG24N9ETK4/D3M Servo valve German Rexroth proportional valve
|
Parameter |
Specification |
|---|---|
|
Order Number |
R900704477 |
|
Model |
4WRZ25W8-325-7X/6EG24N9ETK4/D3M |
|
Type |
Pilot-operated, 2-stage proportional directional valve |
|
Function |
4/3-way (3 positions, 4 ports), spring-centered |
|
Spool Type |
W8 (Overlap spool, control area ratio 2:1) |
|
Nominal Size |
NG25 (CETOP 8) |
|
Max. Operating Pressure |
P, A, B: 350 bar; T port: 210 bar |
|
Rated Flow |
325 L/min (at Δp = 10 bar per control land) |
|
Max. Flow |
Approx. 870 L/min |
|
Electronics |
External Electronics (EE) |
|
Supply Voltage |
24V DC (19.4...35 VDC) |
|
Control Signal |
Requires external amplifier (e.g., ±10 V or 4–20 mA) |
|
Feedback |
No electrical position feedback (open-loop) |
|
Pilot Oil Supply |
Internal (from P) |
|
Pilot Oil Return |
Internal (to T) |
|
Manual Override |
Yes (N9, concealed) |
|
Pressure Reducing Valve |
Yes (D3, ZDR 6 DP0-4X/...) |
|
Seal Material |
NBR (M) |
|
Electrical Connector |
3-pin (2 + PE) plug (DIN EN 175301-803, K4) |
|
Mounting Interface |
ISO 4401-08-08-0-05 (CETOP 8 subplate) |
|
Suitable Media |
Mineral oils (HL, HLP), HETG, HEES, HEPG, HFDU, HFDR |
|
Media Temperature |
-20°C to +80°C (optimal 40–50°C) |
|
Viscosity Range |
20 to 380 mm²/s |
|
Weight |
Approx. 18.7 kg (with D3 option) |
| 4WRZE16W9-100-72/6EG24N9K31/F1D3M |
| 4WRZE16W9-150-72/6EG24N9EK31/F1D3M |
| 4WRZE25E1-220-72/6EG24ETK31/A1D3M |
| 4WRZE25E1-220-72/6EG24N9EK31/A1D3M |
| 4WRZE25E1-325-72/6EG24ETK31/A1D3M |
| 4WRZE25E1-325-72/6EG24N9EK31/A1D3M |
| 4WRZE25E1-325-72/6EG24N9EK31/A1V |
| 4WRZE25E1-325-72/6EG24N9EK31/F1D3M |
| 4WRZE25E1-325-72/6EG24N9ETK31/A1D3M |
| 4WRZE25E1-325-72/6EG24N9ETK31/A1M |
| 4WRZE25E1-325-72/6EG24N9K31/A1D3M |
| 4WRZE25E1-325-72/6EG24N9K31/F1V |
| 4WRZE25E220-72/6EG24ETK31/A1D3M |
| 4WRZE25E220-72/6EG24K31/A1M |
| 4WRZE25E220-72/6EG24N9EK31/A1D3V |
| 4WRZE25E220-72/6EG24N9EK31/A1M |
| 4WRZE25E220-72/6EG24N9ETK31/F1D3M |
| 4WRZE25E220-72/6EG24N9K31/A1D3M |
| 4WRZE25E325-72/6EG24ETK31/A1D3M |
| 4WRZE25E325-72/6EG24K31/A1D3M |
| 4WRZE25E325-72/6EG24N9EK31/A1D3V |
| 4WRZE25E325-72/6EG24N9ETK31/A1D3V |
| 4WRZE25E325-72/6EG24N9ETK31/A1V |
| 4WRZE25E325-72/6EG24N9K31/A1D3V |
| 4WRZE25E3-325-72/6EG24EK31/A1D3M |
| 4WRZE25EA325-72/6EG24ETK31/A1M |
| 4WRZE25EB220-72/6EG24K31/A1M |
| 4WRZE25W6-220-72/6EG24EK31/A1D3M |
| 4WRZE25W6-220-72/6EG24EK31/F1D3M |
| 4WRZE25W6-220-72/6EG24ETK31/A1D3M |
| 4WRZE25W6-220-72/6EG24K31/A1D3M |
| 4WRZE25W6-220-72/6EG24K31/F1D3M |
| 4WRZE25W6-220-72/6EG24K31/F1V |
| 4WRZE25W6-220-72/6EG24N9EK31/A1D3M |
| 4WRZE25W6-220-72/6EG24N9EK31/A1D3V |
| 4WRZE25W6-220-72/6EG24N9EK31/A1M |
| 4WRZE25W6-220-72/6EG24N9EK31/F1D3M |
| 4WRZE25W6-220-72/6EG24N9ETK31/A1D3M |
| 4WRZE25W6-220-72/6EG24N9ETK31/F1D3M |
| 4WRZE25W6-220-72/6EG24N9K31/A1M |
| 4WRZE25W6-220-72/6EG24N9K31/F1D3M |
| 4WRZE25W6-220-72/6EG24N9K31/F1D3V |
| 4WRZE25W6-220-72/6EG24N9K31/F1V |
| 4WRZE25W6-325-72/6EG24EK31/F1D3M |
| 4WRZE25W6-325-72/6EG24ETK31/A1D3M |
| 4WRZE25W6-325-72/6EG24ETK31/F1D3V |
| 4WRZE25W6-325-72/6EG24ETK31/F1M |
| 4WRZE25W6-325-72/6EG24K31/A1D3M |
| 4WRZE25W6-325-72/6EG24K31/A1M |
| 4WRZE25W6-325-72/6EG24K31/F1D3M |
FAQ:
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Q: What is the main difference between this valve and the 4WRZE series?
A: This valve (4WRZ) uses External Electronics (EE), meaning you must provide a separate amplifier card (e.g., VT-5000 series). The 4WRZE series has built-in onboard electronics (OBE).
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Q: What does the /D3M suffix mean?
A: The /D3 suffix indicates an integrated pressure reducing valve (ZDR 6) for regulating pilot pressure. The /M suffix specifies standard NBR seals.
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Q: How does the pilot oil configuration work?
A: This valve (/6EG24N9ETK4) uses internal pilot oil supply (from main P port) and internal pilot oil return (to main T port). This "ET" configuration is the most convenient as it requires no external pilot lines, but you must ensure the main tank line (T-port) backpressure is controlled.
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Q: Why choose this specific configuration?
A: This model is ideal for high-flow applications (325 L/min) requiring simplified plumbing and cost-effective external amplifier control. The internal pilot drain (ET) reduces the number of hydraulic connections, while the integrated /D3 pressure reducer protects the pilot stage from system pressure fluctuations.
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Q: What is the critical installation note?
A: Since the pilot stage drains internally to T, you must ensure the main T-port backpressure is below 30 bar. High backpressure on T can prevent the pilot valve from draining properly, causing erratic main stage operation. Maintain high oil cleanliness (recommended NAS 1638 Class 8 or better for the main stage).
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