Rexroth ZDR6 Series Modular Pressure Reducing Valve | ZDR6DP ZDR6DB ZDR6DA | Hydraulic Sandwich Valve

The ZDR Series modular pressure reducing valves from Chengyuan Hydraulic are high-performance pressure control components fully compatible with Rexroth ZDR6 Series industrial standards. Featuring a sandwich plate design, these valves are installed between the directional valve and subplate, enabling branch pressure reduction without extra piping. For core models including ZDR6DP (Direct-acting), ZDR6DB, and ZDR6DA, we utilize reinforced alloy steel spools. Every valve undergoes 100% simulated condition pressure accuracy and stability testing before shipment to ensure a stable secondary output pressure under complex system loads, guaranteeing 100% original-place interchangeability.

Technical Specifications:

• Series Model: ZDR6 Series (Modular Pressure Reducing Valve)

• Nominal Size: Size 6 (D03 Interface)

• Maximum Operating Pressure: 315 bar (Inlet Port P)

• Pressure Reduction Settings: 25 bar, 75 bar, 150 bar, 210 bar (Refer to codes /75, /210)

• Maximum Flow Rate: 30 L/min to 50 L/min

• Port Function: Port P (DP), Port A (DA), or Port B (DB)

• Adjustment Types: Hand knob, adjusting screw with hex, or with protective cap

• Seal Material: NBR (Standard) / Viton (Optional for high temp)

Key Technical Advantages:

• Precision Honed Spool Technology: The valve spool is crafted from high-strength bearing steel and ultra-precision ground. Micron-level fit between spool and bore minimizes pressure drift, ensuring precise secondary pressure even during long-term continuous operation.

• Integrated Bypass Check Valve: Models like ZDR6DA/DB feature an integrated large-flow check valve. This allows oil to bypass the reducing spool during reverse flow, minimizing pressure drop and improving cycle efficiency.

• Pipeless Modular Construction: The stackable design eliminates the need for fittings and hoses required by traditional branch lines, fundamentally preventing leak points and significantly reducing the overall footprint of the valve block.

• Optimized Damping Response: The internal control oil paths are optimized via fluid dynamics simulation to suppress chatter caused by load fluctuations. This provides smooth pressure transitions and protects sensitive downstream components.

Application Areas:

• Clamping Mechanisms: Used in CNC machines or automation lines to keep clamping cylinders at a constant low pressure, preventing workpiece deformation.

• Pilot Oil Supplies: Providing a stable pilot pressure source for large electro-hydraulic directional valves.

• Auxiliary Circuits: Diversifying a low-pressure branch (e.g., 50Bar) from a high-pressure main system (e.g., 315Bar) for braking or lubrication.

Expert Maintenance Tips:

• Adjustment Protocol: Always adjust pressure from a low setting to high. Avoid forcing adjustments during high system fluctuations to prevent internal spring fatigue.

• Drain Port (Port Y) Integrity: Ensure the drain line remains unobstructed. Excessive backpressure at Port Y will directly increase the reduced pressure setting, leading to actuator malfunction.

• Seal Replacement: Since these are stacked valves, always replace all interface O-rings during disassembly and tighten the tie-rods to the specified torque (approx. 11 Nm) to prevent interlayer leaks.