Yanhui Hydraulic Co., Ltd. is a professional global supplier of high-performance hydraulic components, specializing in servo valves, proportional valves, hydraulic pumps, motors, and control systems.
Why Choose Yanhui Hydraulic?
- Over 10 years of hydraulic industry experience
- Strong expertise in MOOG, Bosch Rexroth, Parker, Eaton, Vickers, and other global brands
- Professional pre-sales and after-sales technical support
- Stable supply chain and fast international logistics
- Strict quality inspection before shipment
Product Overview – Why Choose MOOG D634?
The MOOG D634 series is engineered to deliver exceptional accuracy, fast frequency response, and stable performance even under high pressure and continuous operation.
Key Features & Benefits
Ultra-High Precision Control
The D634 series offers excellent linearity and low hysteresis, ensuring stable and repeatable motion in closed-loop systems.
Fast Dynamic Response
High-frequency response makes it suitable for high-speed cycles, improving production efficiency and reducing scrap rates.
Robust Industrial Design
Designed to operate under high pressure and continuous duty, making it reliable for heavy-duty applications.
Flexible Configuration
Multiple flow ratings, signal options, and spool configurations allow easy integration into existing hydraulic systems.
Hydraulic Specifications
| Specification | Value |
|---|---|
| Valve Type | Two‑stage servo valve |
| Rated Flow (L/min) | 19, 38, 60, 100 |
| Max Operating Pressure | 315 bar (4500 psi) |
| Pressure Drop at Rated Flow | 70–100 bar (varies by model) |
| Internal Leakage (max) | ≤ 0.5 ml/min |
| Recommended Filtration | ≤ 10 µm absolute |
| Fluid Temperature | –20 °C ~ +80 °C |
| Viscosity Range | 15 ~ 75 cSt |
| Fluid Type | Mineral oil / anti‑wear hydraulic fluids |
Performance Characteristics
| Parameter | Typical Value |
|---|---|
| Frequency Response (–3 dB) | Up to 100 Hz |
| Hysteresis | ≤ 3 % |
| Linearity Error | ≤ 2 % |
| Repeatability | ≤ 0.5 % |
| Null Shift | ≤ 1 % FS |
| Resolution | Infinite (servo control) |
Electrical Specifications
| Parameter | Value |
|---|---|
| Command Signal | ±10 V DC (standard) |
| Alternative Input | 4–20 mA with internal/external converter |
| Supply Voltage | ±15 V DC (typical) |
| Coil Resistance | Approx. 200–300 Ω |
| Connector | MOOG 9‑pin industrial |
| Electrical Protection | IP65 (with proper connector) |
How to Select the Right MOOG D634 Valve
- Required Flow Rate: Select a rated flow that matches your system demand at the specified pressure drop.
- Control Signal Compatibility: Ensure the valve matches your controller output (±10V or 4–20mA).
- System Pressure & Oil Cleanliness: Confirm operating pressure and ensure proper filtration to extend valve lifespan.
- Mounting & Interface: Verify ISO/CETOP mounting compatibility to avoid installation issues.
If you are unsure, Yanhui Hydraulic Co., Ltd. provides free pre-sales technical consultation to help you select the correct model.
FAQ
Q1: Is the MOOG D634 suitable for continuous operation?
Yes. The D634 series is designed for continuous industrial duty, provided oil cleanliness and operating conditions meet MOOG standards.
Q2: Can you supply original MOOG D634 valves?
Yes. We supply original MOOG products as well as high-quality interchangeable alternatives, based on customer requirements and budget.
Q3: What is the typical delivery time?
- Stock models: 3–7 working days
- Non-stock or customized models: Pls kindly contact us
Q4: How can I extend the service life of the valve?
- Maintain oil cleanliness ≤10 μm
- Use recommended hydraulic oil
- Avoid pressure spikes
- Perform regular system maintenance
Q5: Can you help replace an old or discontinued D634 model?
Absolutely. Our engineers can cross-reference old MOOG part numbers and recommend compatible replacements.
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