Typical Application Scenarios

The D91FC series is designed for heavy-duty industrial applications where high flow volumes must be managed with high accuracy:

• Die Casting & Injection Molding: Controls high-flow clamping and injection cylinders where rapid movement and precise end-positioning are required.

• Large Hydraulic Presses: Manages the main ram movement in forging or stamping presses for synchronized and smooth motion.

• Steel & Primary Metal Processing: Used in rolling mills or heavy handling equipment that requires rugged, high-capacity flow control.

• Marine & Offshore: Ideal for large winch systems or steering gear requiring robust proportional control in harsh environments.

Important Precautions (Usage Notes)

• Filtration Standards: Due to the high-definition position feedback and pilot-operated design, this valve is sensitive to contamination. Maintain oil cleanliness at ISO 4406 18/16/13 (NAS 1638: 7) or better.

• External Drain (Port Y): This configuration (Code 1) uses an external pilot drain. Ensure the Y-port is connected directly to the tank with minimal backpressure (ideally < 2 bar). Excessive backpressure in the drain line will cause inaccuracies in spool positioning.

• Pilot Pressure Requirements: Since the valve is pilot-operated, ensure a minimum pilot pressure of 20 bar is always available to shift the main spool, even if the P-port pressure drops.

• Electrical Grounding: Use shielded cables for the 0-10V command signal and ground the shield only at the control cabinet side. This is vital to protect the digital electronics from electromagnetic interference (EMI) typical in industrial plants.

• Mounting Surface: Given the weight of 21 kg and the high-precision spool, ensure the mounting manifold is perfectly flat and the mounting bolts are tightened to the specified torque to prevent body distortion.