H791 & H792 Two-Stage Servo Valve
3 week ago
Product details
H791 & H792 Two-Stage Electro-Hydraulic Servo Valve
Product Overview
H791 and H792 series two-stage electro-hydraulic servo valves adopt classic nozzle-flapper pilot stage structure with mechanical feedback design. They are four-way two-stage servo valves with stable static & dynamic performance. H791 is medium-flow specification, while H792 supports larger rated flow. The series features compact structure, low hysteresis, excellent linearity and reliable anti-vibration performance. The pilot oil supply supports internal and external optional configuration. Standard installation dimensions can be used as direct replacement for mainstream imported two-stage servo valves, widely used in medium and high-precision closed-loop electro-hydraulic control systems.
H791 & H792 Two-Stage Servo Valve is a large-flow high-precision Hydraulic valve, serving as the core closed-loop control element of high-performance hydraulic system. This premium Hydraulic valve adopts mature two-stage pilot-operated architecture with spool position feedback. It converts electrical control signals into proportional hydraulic flow output, realizing precise adjustment of position, speed and force for heavy-duty industrial Machine. Installed in the hydraulic system, H791 & H792 Two-Stage Servo Valve greatly enhances control accuracy, response speed and running stability of automated heavy-load Machine.
Common Rated Flow Specifications
H791: 40L/min, 60L/min, 80L/min, 100L/min
H792: 120L/min, 160L/min, 200L/min, 250L/min
*Flow tested under ΔP=35 bar per metering edge
- Structure: Two-stage, nozzle-flapper type, mechanical feedback, 4-way servo valve
- Pilot control mode: Internal pilot supply / External pilot supply optional
- Feedback form: Mechanical spring feedback
- Mounting standard: ISO 4401 standard mounting interface
Main Technical Parameters
Parameter Specification
Valve Type Two-Stage Mechanical Feedback Electro-Hydraulic Servo Valve
Max Working Pressure (P/A/B Ports) 315 bar (31.5 MPa)
Max Return Pressure (T Port) ≤ 100 bar
Recommended Hydraulic Fluid ISO VG32, VG46 anti-wear mineral hydraulic oil
Required Oil Cleanliness NAS 7 or higher cleanliness grade
Operating Temperature -20°C ~ +80°C
Hysteresis ≤ 3%
Resolution ≤ 0.5%
Input Control Signal ±10V / ±10mA optional
Ambient Vibration Resistance Up to 30g three-axis vibration condition
Product Advantages
1. Mature dual nozzle-flapper mechanical feedback structure, stable control characteristic, long service life and low failure rate
2. Excellent linearity and repeatability, small zero drift, suitable for continuous long-hour industrial operation
3. Compact overall layout, strong anti-shock and anti-vibration capability, adaptable to complex on-site working environment
4. Flexible pilot oil supply selection (internal/external), convenient for different hydraulic system layout schemes
5. Standard ISO installation hole pattern, interchangeable with similar international mainstream two-stage servo valves
6. Simple zero adjustment operation, convenient field debugging and maintenance
7. Complete flow specifications, covering medium and medium-large flow demand for industrial closed-loop control
Application Range
Material fatigue testing machines, universal test benches, metallurgical rolling auxiliary equipment, precision forming machinery, vibration simulation test platforms, ship simulation equipment, pressure & position closed-loop control equipment, and general industrial precision hydraulic servo systems.
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