Application Scenarios: The G771K226A is engineered for precision motion control in industrial environments where high dynamic response is required. It is commonly utilized in material testing machines, industrial robotics, plastic injection molding machines, and automated flight simulators. Its robust design makes it ideal for managing the position, velocity, and force of hydraulic actuators in closed-loop systems that operate under variable load conditions and high-frequency cycling.

Precautions for Use:

1. Fluid Cleanliness: The nozzle-flapper pilot stage is highly susceptible to contamination. It is mandatory to maintain a hydraulic fluid cleanliness level of ISO 4406 Code 14/11 or better to prevent “stuck” spools or erratic null shifts.

2. Filtration: Always install a high-pressure, non-bypass filter (rated at β10​≥75) immediately upstream. Never use the servo valve to flush a new system; use a dedicated flushing plate instead.

3. Mounting Flatness: The mounting manifold must be flat within 0.05 mm (0.002 in). An uneven surface can distort the internal bushing when the bolts are torqued, causing internal friction or spool binding.

4. Seal Compatibility: Ensure the hydraulic fluid is chemically compatible with Viton (FKM) seals to prevent seal swelling, which can lead to internal leakage and loss of precision.

5. No Dry Operation: Do not apply electrical signals to the valve without hydraulic pressure, as the internal components rely on the fluid for damping and cooling.