OCY-G01-W-Y-20 Nachi One-way Throttle Valve 25MPa

Product Overview

Models such as OCY-G01-W-Y-20, OCY-G03-A-X-J51, OCY-G03-W-Y-51 and OCY-G01-W-X-20 belong to the Nachi OCY series of modular one-way throttle valves (flow regulator with check valve). Featuring a sandwich-plate design, they comply with ISO 4401 mounting standards. Every unit undergoes rigorous 100% simulated operating-condition testing and offers excellent drop-in interchangeability for stacking directly between directional valves and subplates. Precise flow restriction in one direction and free reverse flow enable reliable actuator speed control.

Technical Specifications

• Model examples: OCY-G01-W-Y-20, OCY-G03-W-Y-J51
• Valve type: Modular one-way throttle valve (flow regulator with check)
• Nominal size: G01 = NG6; G03 = NG10
• Mounting interface: ISO 4401
• Maximum operating pressure: 25 MPa
• Maximum flow: approx. 50 L/min (G01); approx. 100 L/min (G03)
• Control ports: W = A&B ports; A / B / P single port options
• Throttling type: X = Meter-in; Y = Meter-out
• Check valve cracking pressure: approx. 0.08–0.1 MPa
• Weight: approx. 1.2–1.3 kg (G01); approx. 3.0–3.1 kg (G03)

Key Technical Advantages

1. Modular sandwich design: Installs directly between directional valve and subplate/manifold, saving space and reducing piping leakage points.
2. Integrated throttle and check function: Precise flow restriction in one direction with free reverse flow via integral check valve for reliable actuator speed control.
3. Excellent drop-in interchangeability: Strict compliance with ISO 4401 mounting face allows direct replacement of equivalent modular throttle check valves, minimizing modification costs and downtime.
4. Multiple control options: Supports A/B dual-port, single-port, and meter-in/meter-out configurations for flexible circuit adaptation.
5. Reliable adjustment and long service life: Stable precision adjustment mechanism; hardened internal components provide strong contamination resistance.

Application Areas

Injection moulding machines, die-casting machines, machine-tool hydraulics, packaging machinery, automated production lines, mobile equipment and other medium-to-high-pressure hydraulic circuits requiring precise actuator speed control.

Expert Maintenance Tips

1. Ensure mounting surfaces are clean and flat before installation; fit seals correctly and tighten specified bolts evenly to the recommended torque.
2. Maintain recommended fluid cleanliness; use hydraulic fluids compatible with the installed seal material.
3. To adjust flow, loosen the locking device and turn the adjusting screw slowly; re-lock after setting.
4. Periodically inspect the valve body and adjustment mechanism for leakage or sticking; clean and protect sealing surfaces during long-term storage.
5. Do not disassemble internal throttle and check valve components. Seal replacement or repairs should be performed only by experienced technicians.