I. Core Specifications (Essential for Foreign Trade/Quotation)
1. Hydraulic Parameters
| Parameters |
Indicators |
Description |
| Model |
D661-4651 |
Complete Model: D661-4651/G35J0AA6VSX2HA |
| Type |
Two-stage servo valve (jet pilot + spool power stage) |
With spool position feedback (LVDT) |
| Maximum working pressure |
350 bar (35 MPa) |
P/A/B port; T port ≤350 bar |
| Rated flow rate |
40 L/min |
@70 bar valve pressure drop (typical) |
| Maximum flow rate |
Approx. 200 L/min (depending on spool specification) |
|
| Step response |
≤14 ms |
100% signal, at 210 bar |
| Frequency response |
30–50 Hz |
±100% input signal |
| Control accuracy |
Hysteresis < 0.8%, Linearity < 1% Minimum controllable flow deviation ≤0.5% |
|
| Working medium |
Petroleum-based hydraulic oil (DIN 51524), water glycol, phosphate ester |
|
| Oil viscosity |
Recommended 15–45 mm²/s; Permissible 5–400 mm²/s |
|
| Cleanliness |
ISO 4406 <15/12 (standard); <14/11 (long life) |
|
2. Electrical parameters
| Parameters |
Specifications |
Description |
| Supply voltage |
24 VDC (18–32 VDC) |
|
| Control signal |
±10 V, ±10 mA, 4–20 mA (optional) |
|
| Coil resistance |
20 Ω (single coil) / 40 Ω (series) |
|
| Protection rating |
IP65 (with matching plug) |
|
| Ambient temperature |
-20°C ~ +60°C; Oil: -20°C ~ +80°C |
|
| Vibration |
30g, Triaxial |
|
3. Mechanical and Installation
| Parameters |
Indicators |
Description |
| Installation Standard |
ISO 4401 Dimension 05 (CETOP 05) |
|
| Installation Method |
35mm DIN rail or flange mounting |
Any installation position |
| Valve Body Material |
Aluminum alloy / Precipitation hardened stainless steel |
|
| Sealing |
Nitrile rubber (NBR), Fluororubber (FKM) optional |
|
4. Supply and Warranty
- Delivery Time: Regularly 8–12 weeks, some in stock
- Warranty: 12 months from the manufacturer
- Origin: USA / Europe
II. Core Advantages
- ServoJet® Jet Tube Pilot: Highly resistant to contamination, no pilot oil source required, simple maintenance.
- Integrated Electronics + LVDT Feedback: In-valve closed-loop control, high precision, good stability, and strong anti-interference.
- Fast Response + High Pressure and High Flow: Suitable for high-speed, heavy-duty closed-loop systems (such as rolling mills, injection molding machines, and testing benches).
- Wide Media Compatibility: Adaptable to various hydraulic oils to meet different operating conditions.
- High Reliability: Low hysteresis and high repeatability, suitable for continuous production environments.
III. Typical Applications
- Metallurgical Equipment: Roll gap control, tension control in rolling mills
- Plastics Machinery: Servo control for injection molding machines and extruders
- Testing Equipment: Material testing machines, hydraulic servo testing benches
- Industrial Automation: Pressure/Position/Force closed-loop control systems
- Construction Machinery: Precision control of heavy-duty hydraulic actuators