Rexroth DR10 DR20 DR30 Series Pressure Reducing Valve | DR10-4-50B DR20-5-5X

The DR Series (including DR10, DR20, and DR30 platforms) premium pilot-operated high-pressure hydraulic pressure reducing valves manufactured by Chengyuan Hydraulic are heavy-duty, high-precision fluid regulation modules fully engineered to match global Rexroth industrial and mobile machinery benchmarks. Tasked with reducing a fluctuating primary system input pressure down to a lower, strictly stabilized secondary circuit threshold, this series delivers exceptional pressure consistency. The portfolio comprehensively covers central catalog configuration code strings—including the standard subplate-mounting DR10-4-50B/ series, the high-delivery variant DR20-4-5X/100YM, and the heavy-duty graded unit DR20-5-5X/200YM—spanning critical adjustment options across 50 bar, 100 bar, 200 bar, and 315 bar spring groups. Built with high-tensile ductile iron housings containing case-hardened alloy spools, the layout accounts for subplate connection mounting (4-5X/5-5X series), hex-head adjustment screw setup with protective metal caps (Y), and internally/externally routed pilot drain structures (M). Every single DR valve undergoes 100% simulated circuit load testing for secondary pressure drift mitigation, reverse fluid shock isolation, micro-pilot drain flow limitation, and minimum low-flow stability hold tests prior to shipment to match official performance curves, delivering proven 100% original-place interchangeable compatibility.

Technical Specifications:

• Core Product Framework: Rexroth DR10 / DR20 / DR30 Template Pilot-Operated Subplate Pressure Reducing Valves

• Model Configurations Supported: DR10-4-50B / DR20-4-5X/100YM / DR20-5-5X/200YM / DR30

• Nominal Orifice Fluid Channels (Size):

  • Size DR10 Interface: 10 mm nominal fluid passage conforming to ISO 5781 mounting standards

  • Size DR20 Interface: 20 mm nominal fluid passage conforming to ISO 5781 mounting standards

  • Size DR30 Interface: 30 mm nominal fluid passage conforming to ISO 5781 mounting standards

• Maximum Allowable Primary Inlet Pressure (Port P / Main Loop): Rated up to 315 bar (31.5 MPa / 4568 psi)

• Secondary Reduced Pressure Calibration Classes (e.g., Code 50 / 100 / 200 / 315):

  • Class 50 Grid: Adjustable pressure setting from 10 bar up to 50 bar

  • Class 100 Grid: Adjustable pressure setting from 10 bar up to 100 bar

  • Class 200 Grid: Adjustable pressure setting from 10 bar up to 200 bar

  • Class 315 Grid: Adjustable pressure setting from 10 bar up to 315 bar

• Maximum Volumetric Fluid Flow Capacities:

  • DR10 Platform Metrics: Rated volumetric delivery up to 150 L/min (39.6 gpm)

  • DR20 Platform Metrics: Rated volumetric delivery up to 300 L/min (79.2 gpm)

  • DR30 Platform Metrics: Rated volumetric delivery up to 400 L/min (105.6 gpm)

• Structural Interface Options (Code YM):

  • Code Y Element: Fitted with a hex socket-head adjustment screw shielded by a robust protective cover.

  • Code M Element: Integrated fluid gallery mapping allowing internal or external pilot oil drainage back to the tank.

• Elastomer Compounds & Media Matrix: Fitted with high-resilience NBR (Nitrile) seals as standard (FKM/Viton alternative available), compatible with mineral-based hydraulic oils across thermal ranges from -30°C to +80°C.

Key Technical Advantages:

• High-Response Main Spool with Optimized Geometric Damping Orifices: The central throttling spool of the DR10/DR20 is forged from high-grade alloy steel, case-hardened, and sub-micron lapped to secure a slip-fit clearance tolerance within 8 to 12 microns. Integrated micro-damping channels within the spool dynamically buffer fast upstream fluid pulsations from primary port P, holding secondary output stability at Port A within a tight tolerance of $\pm 1.5\%$ of the setpoint under extreme system volume swings.

• Low-Shear Hydrostatic Pilot Poppet and Fatigue-Resistant Springs: The primary pilot stage incorporates a high-hardness metal-to-metal line-contact seating poppet. Backed by imported Cr-V alloy spring steel subjected to rigorous cyclical endurance runs, the valve maintains its exact pressure crack point without micro-thermal drift or high-frequency chattering (squealing noise), even at maximum settings up to 315 bar.

• High-Tensile Ductile Iron Housing Castings (QT500-7 Framework): The outer manifold structures are poured from heavy-walled QT500-7 grade ductile iron, minimizing structural vibration under maximum flow constraints up to 300 L/min. This high-mass casting design neutralizes micro-acoustic resonance waves within the fluid pathways, ensuring quiet performance in industrial plants.

• Modular Integration Options for Anti-Reverse Check Valves: Our precision-machined interface footprints adapt easily to integrated internal bypass check valve configurations. When the hydraulic system executes a cycle reversal (Port A backflow to Port P), the checking valve opens instantly to permit unrestricted reverse flow, simplifying plumbing and ensuring smooth actuator decompression or fast return strokes.

Application Areas:

• Industrial Centralized Multi-Pressure HPU Sub-Circuits: Main pressure regulation for auxiliary low-pressure clamping cylinders in metal stamping presses and CNC machine-tool hydraulic chuck networks.

• Heavy Mobile Infrastructure Machinery Platforms: Stabilized low-pressure fluid supply manifolds for pilot control joysticks in heavy wheel loaders, underground mining machines, and road headers.

• Primary Metallurgical & Steel Rolling Mills: High-pressure branch pressure controllers handling blast furnace roof drives and heavy hydraulic self-adaptive guide cylinders in steel rolling mills.

Expert Maintenance Tips:

• Isolate Pilot Drain Connections (Port Y) and Prevent Backpressure Triggers: For all DR..YM catalog items, the pilot control stage external drain line (Port Y on the subplate or control block cap) must route directly back to the reservoir via a dedicated independent pipeline—never connect it to the main return lines or lines with backpressure. Any pressure building in the drain line adds directly to the pilot spring load, causing unexpected pressure spikes at the secondary outlet (Port A), risking component damage.

• Enforce the “Low-to-High” Calibration Sequence with Locknut Securing: When setting pressure values on-site for a DR10 or DR20 valve, never pre-tighten the adjustment bolt (Y-type element) to its mechanical limit prior to startup. Always back out the adjustment screw fully before priming the pump. Once the system is running at idle, slowly dial the bolt inward while monitoring the secondary pressure gauge until the target level is reached. Always tighten the outer locknut securely and replace the protective cap to prevent setting drift caused by structural machine vibration.

• Enforce Clean Fluid Mandates to Protect the Micro-Damping Orifices: Pilot-operated pressure control blocks are highly vulnerable to suspended rigid particulates like machining chips or chemical sealant shreds. Particulate ingestion can jam the main spool or block the micro-damping orifices, causing sudden pressure regulation failure (outlet pressure locking equal to inlet pressure) or complete blockage. Maintain loop cleanliness matching or exceeding ISO 4406 19/16/13, and ensure a full flushing cycle is run prior to first-time machine commissioning.