DG-01-22 Yuken Remote Control Relief Valve 25MPa DT-02-C-22

Product Overview

The DG-01-22 / DT-01-22 and DT-02-C-22 / DG-02 series are Yuken remote control relief valves and direct-type relief valves. The DG-01/DT-01 models serve as remote pilot control valves for pilot-operated pressure control valves, enabling multi-level pressure setting and system overload protection. The DT-02/DG-02 models are direct-acting relief valves designed for pressure limiting and safety in low-flow circuits. Featuring a cast-iron body and precision spring adjustment, these valves conform to JIS standards and offer true interchangeability as direct drop-in replacements for original Yuken units without piping or manifold modifications. Each valve undergoes precision machining and 100% simulated duty-cycle testing to ensure stable pressure regulation, reliable response, and long service life.

Technical Specifications 

• Model: DG-01-22 / DT-01-22 (Remote Control Relief Valve); DT-02-C-22 / DG-02 (Direct Type Relief Valve)
• Type: Remote control relief valve (DG/DT-01); Direct-acting relief valve (DG/DT-02)
• Maximum Operating Pressure: 25 MPa (DG-01/DT-01); 21 MPa (DT-02/DG-02)
• Maximum Flow: Approx. 16 L/min (DT-02/DG-02)
• Pressure Adjustment Range (example): B (approx. 3.5–7 MPa), C (approx. 7–14 MPa), H (approx. 14–21 MPa) – depending on spring code
• Mounting: DG type – sub-plate mounting; DT type – threaded connection (Rc 1/4)
• Weight: Approx. 1.4 kg (DG-01); 1.6 kg (DT-01); 1.5 kg (DT-02/DG-02)
• Port Threads: Pressure and tank ports Rc 1/4 (size 01/02)
• Fluid: Mineral-oil based hydraulic fluid
• Operating Temperature: Approx. –15°C to +70°C
• Design Number: 22 (standard seals)

Key Technical Advantages

1. Precise remote pressure control – DG/DT-01 connects to the pilot port of main relief valves, enabling remote stepless pressure adjustment and multi-level pressure switching with compact design and easy operation.
2. Reliable direct-acting pressure limiting – DT-02/DG-02 uses a direct-acting design for fast response, ideal for overload protection and pressure setting in low-flow circuits with high regulation accuracy.
3. True interchangeability and standard interfaces – Fully compatible with original Yuken mounting dimensions and ports for direct replacement, minimizing downtime and modification costs.
4. Robust construction and stable performance – Cast-iron body with precision-matched spring and spool, validated by 100% duty-cycle testing, ensures long-term stable regulation and low leakage.

Application Areas

Suitable for machine-tool hydraulic systems, compact power units, injection molding machines, die-casting auxiliary circuits, hydraulic clamping fixtures, test stands, and any industrial hydraulic equipment requiring remote pressure control or low-flow overload protection.

Expert Maintenance Tips

Loosen the lock nut before adjustment and turn the handle slowly (clockwise to increase pressure, counterclockwise to decrease); always retighten the lock nut after setting; connect the tank line directly to the reservoir and do not share it with other valves; ensure clean and flat sealing surfaces on the sub-plate or threads during installation; periodically inspect the spring and seals, and maintain recommended fluid cleanliness; fully depressurize the system before extended storage.