Vickers DGMC Series Stack Relief Valve | DGMC2-3-AT DGMC-7-AT Modular Pressure Valve

The DGMC Series stack-mounted relief valves by Chengyuan Hydraulic are high-performance modular pressure control components fully compatible with Vickers (Eaton) industrial standards. Featuring a “sandwich” design, these valves are mounted directly between a directional control valve and a subplate, enabling integrated pressure regulation without the need for additional piping. For critical configurations such as the DGMC2-3-AT-GW-BT-GW-41 (independent A&B port adjustment) and the high-flow DGMC-7-AT-FH-20, we utilize high-tensile cast iron bodies and precision-ground spool assemblies. Every unit undergoes 100% simulated load testing to ensure responsive cracking characteristics and minimal pressure drift under $315 \text{ bar}$ environments, delivering guaranteed 100% original-place interchangeability.

Technical Specifications :

• Series Specification: DGMC2-3 (ISO 4401-03 / NG6); DGMC-7 (ISO 4401-07 / NG16)

• Model Codes: DGMC2-3-AT-GW-BT-GW-41 / DGMC2-3-AT-CW-BT-BW-41 / DGMC-7-AT-FH-20

• Maximum Operating Pressure: $315 \text{ bar} (4500 \text{ psi})$

• Max Flow Capacity (Size 03): $60 \text{ L/min} (16 \text{ USgpm})$

• Max Flow Capacity (Size 07): $300 \text{ L/min} (80 \text{ USgpm})$

• Pressure Adjustment Ranges: A (3-30 bar); B (3.5-70 bar); C (3.5-140 bar); G (3.5-250 bar)

• Control Configurations: Single port (A, B, or P) or Dual independent ports (A & B)

• Adjustment Options: Knob (G) / Internal Screw with Locknut (W) / Lever (H)

• Sealing Options: Nitrile (Buna-N) standard / Viton for phosphate ester fluids

Key Technical Advantages:

• Precision Modular Stack Design: The DGMC series eliminates the complexity of traditional line-mounted plumbing, significantly reducing the footprint of hydraulic manifolds. Its standard ISO interface allows for rapid functional expansion on any D03 or D07 compliant valve stack.

• Dual-Port Independent Control: In the “AT-BT” dual-relief configuration, pressures for ports A and B can be set independently. This is ideal for protecting actuators (motors or cylinders) where different safety pressures are required for extension and retraction or clockwise and counter-clockwise rotation.

• Superior Stability & Repeatability: The spool is crafted from vacuum-heat-treated alloy steel (HRC 60+). Combined with advanced micro-metering notches, it effectively suppresses pressure override and high-frequency oscillation during high-flow relief, ensuring smooth actuator movement.

• Zero-Leakage Construction: Precision-lapped mounting surfaces and premium seal kits ensure zero external leakage under continuous high-pressure pulses. The micron-level spool-to-bore fit extends the fatigue life of the valve in harsh, high-cycle environments.

Application Areas:

• Industrial Machine Tools: Precise pressure maintenance for hydraulic clamping circuits.

• Injection Molding Machinery: Secondary safety relief for mold open/close circuits.

• Mobile Equipment: Overload protection for steering circuits or auxiliary hydraulic systems on compact cranes.

• Hydraulic Power Units (HPU): Primary pressure setting and safety redundancy in space-constrained systems.

Expert Maintenance Tips:

• Stacking Order Integrity: Ensure the relief valve is correctly positioned beneath the directional valve. If using other modular valves (like pilot-operated checks), verify the stack sequence does not conflict with the intended circuit logic.

• Pressure Setting Margin: It is recommended to set the relief valve cracking pressure to $110\% \sim 115\%$ of the maximum system working pressure. Setting it too close to the working pressure will lead to frequent valve cracking and excessive heat generation.

• Fluid Cleanliness Management: Due to the fine internal passages, maintain a system filtration rating of at least $\beta_{10} \ge 75$ (ISO 4406 18/16/13) to prevent spool sticking caused by particulate matter.