MRP-01-B-30 MRP-03-H-30 MRP-04-C-10 Yuken Pressure Reducing Valve 350 bar

Product Overview

The MRP series modular pressure reducing valves are pilot-operated pressure reducing valves engineered by Yuken for industrial hydraulic systems, designed to precisely reduce high primary circuit pressure to a lower secondary pressure required by sub-circuits. Through modular stacking installation, these valves can be directly combined with directional valves, flow control valves, and other modules to build compact, leak-free hydraulic circuits without complex piping.

The MRP series covers multiple sizes including NG6 (01 size), NG10 (03 size), and NG16 (04 size) . Valve bodies are manufactured from high-strength cast iron with optimized internal flow paths, offering high pressure regulation accuracy, fast response, and excellent reliability.

The MRP series offers multiple pressure adjustment ranges (A/B/C/H options), covering a complete range from 0.8 MPa to 31.5 MPa. Conforming to ISO 4401 standard mounting interfaces, these valves can be seamlessly combined with Yuken DSG series solenoid directional valves and other modular valves.

Our complete range of Yuken MRP reducing valves strictly adheres to OEM technical standards, achieving 100% direct interchangeability with original components. Every unit undergoes 100% simulated operating condition bench testing prior to shipment, ensuring performance parameters are fully consistent with genuine Yuken products. Direct replacement significantly reduces equipment downtime and maintenance costs.

⚠️ Brand and Model Attribution Note:

• MRP-01-B-30, MRP-03-H-30, and MRP-04-C-10 all belong to the Yuken MRP series modular pressure reducing valves

• MRP = Reducing Valve for P-Line

• MRA = Reducing Valve for A-Line

• MRB = Reducing Valve for B-Line

• Additional sizes including MRP-06 (NG25) and MRP-10 (NG32) are also available

⚠️ Model Code Decoding:

• MRP = Modular Pressure Reducing Valve for P-Line

• 01 / 03 / 04 = Valve size (01=NG6/CETOP 3; 03=NG10/CETOP 5; 04=NG16)

• B / C / H = Pressure adjustment range code (A: 0.8–3.5 MPa; B: 0.8–7 MPa; C: 3.5–14 MPa; H: 7–31.5 MPa)

• 30 / 10 = Design series number

Technical Specifications 

MRP-01 Series (NG6) General Specifications

• Product Series: Yuken MRP series modular pressure reducing valve

• Valve Size: 01 (NG6 / CETOP 3)

• Brand: Yuken

• Product Type: Pilot-operated modular pressure reducing valve

• Maximum Operating Pressure: 35 MPa (350 bar)

• Maximum Flow Rate: 60 L/min

• Mounting Interface Standard: ISO 4401-AB-03-4-A (D03)

• Mounting Type: Stacked installation

• Compatible Fluids: Mineral-based hydraulic oil (ISO VG32/VG46) or synthetic hydraulic oil

• Operating Temperature Range: -15°C to +60°C (seal material dependent)

MRP-01-B-30 (NG6, B Pressure Range)

• Product Series: Yuken MRP series modular pressure reducing valve

• Model Code: MRP-01-B-30

• Valve Size: 01 (NG6 / CETOP 3)

• Pressure Adjustment Range (B range) : 0.8 – 7 MPa (116 – 1020 PSI)

• Maximum Flow Rate: 40 – 60 L/min

• Maximum Operating Pressure: 25 – 35 MPa (250 – 350 bar)

• Mounting Interface Standard: ISO 4401-AB-03-4-A

• Adjustment Type: Screw with lock nut

• Weight: Approx. 1.1 – 1.4 kg

• Height: Approx. 40 mm

MRP-03-H-30 (NG10, H Pressure Range)

• Product Series: Yuken MRP series modular pressure reducing valve

• Model Code: MRP-03-H-30

• Valve Size: 03 (NG10 / CETOP 5)

• Pressure Adjustment Range (H range) : 3.5 – 24.5 MPa (35 – 245 bar)

• Maximum Flow Rate: 70 L/min (18.5 gpm)

• Maximum Operating Pressure: 25 MPa (250 bar)

• Mounting Interface Standard: ISO 4401 (NG10 / CETOP 5)

• Pressure Circuit: P-Line

MRP-04-C-10 (NG16, C Pressure Range)

• Product Series: Yuken MRP series modular pressure reducing valve

• Model Code: MRP-04-C-10

• Valve Size: 04 (NG16)

• Pressure Adjustment Range (C range) : 3.5 – 14 MPa

• Maximum Flow Rate: 250 L/min

• Maximum Operating Pressure: 25 MPa (250 bar)

• Design Series: 10 series

⚠️ Pressure Adjustment Range Code Description (applicable to MRP-01/03/04 series):

• A range: 0.8 – 3.5 MPa

• B range: 0.8 – 7 MPa

• C range: 3.5 – 14 MPa

• H range: 7 – 31.5 MPa

Key Technical Advantages

1. Pilot-Operated Design for High-Precision Pressure Control

The MRP series features a pilot-operated pressure reducing design, using a pilot valve to precisely control the main spool for accurate and stable outlet pressure. Compared to direct-acting reducing valves, the pilot-operated design delivers superior regulation accuracy and stability under high-flow conditions, with minimal pressure fluctuation and fast response.

2. Modular Stacking Design for Pipe-Free Compact Installation

The MRP series features a modular (sandwich) design that mounts directly on ISO 4401 standard interfaces, enabling vertical stacking with directional valves (DSG series), flow control valves, and other modules. Complex hydraulic circuits can be built without extensive piping, significantly reducing leak points, vibration, and noise while saving installation space and improving overall system reliability.

3. Multiple Sizes and Ranges for Flexible System Adaptation

The MRP series offers multiple size options including 01 (NG6), 03 (NG10), 04 (NG16), 06 (NG25), and 10 (NG32) . Pressure adjustment ranges cover A/B/C/H four options from 0.8 MPa to 31.5 MPa. Whether for low-pressure pneumatic auxiliary circuits or high-pressure main hydraulic systems, a matching MRP reducing valve is available.

4. High Pressure Rating and Large Flow Capacity

The MRP-01 series supports up to 350 bar operating pressure and 60 L/min flow. The MRP-03 series supports 250 bar and 70 L/min. The MRP-04 series supports 250 bar and 250 L/min. From compact machine tool hydraulic systems to large metallurgical equipment, the MRP series offers a suitable model.

5. High Integration with Standardized Interfaces

The MRP series conforms to ISO 4401-AB-03-4-A (D03) standard mounting interfaces. Modular valves of the same size across different brands are physically and interface-wise identical, enabling 100% direct interchangeability. Yuken 01 series modular valves allow free combination of various functional modules for rapid construction of complex hydraulic circuits.

6. 100% Direct Interchangeability and Simulated Condition Testing

All models strictly adhere to Yuken original mounting dimensions and interface standards (ISO 4401), enabling direct drop-in replacement of original reducing valves without manifold modification or system adjustment. Every unit undergoes 100% simulated operating condition bench testing prior to shipment, ensuring consistent, stable performance at rated pressure and flow.

Application Areas

• Machine Tool Equipment: Sub-circuit pressure control for large CNC machine tools and machining centers

• Injection Molding Machinery: Multi-stage pressure control for injection molding and die-casting machines

• Construction Machinery: Auxiliary circuit pressure regulation for excavators and wheel loaders

• Metallurgical Equipment: Multi-pressure level control for rolling mills and continuous casting equipment

• Marine & Offshore: Pressure control for steering gear and deck machinery hydraulic systems

• Wind Power: Pressure regulation and control for wind turbine hydraulic pitch systems

• Single Pump Multi-Pressure Systems: Supplying multiple circuits with different pressure requirements from a single hydraulic pump

Expert Maintenance Tips

1. Verify Model and System Compatibility Prior to Installation

The MRP series offers multiple sizes (01/03/04/06/10), pressure adjustment ranges (A/B/C/H), and design series (30/10). Confirm prior to installation:

• Valve size meets system flow requirements (01=60 L/min, 03=70 L/min, 04=250 L/min)

• Pressure adjustment range covers the required secondary pressure

• Mounting interface standard matches the manifold (ISO 4401)

2. Stacked Installation Precautions

The MRP series features stacked (sandwich) installation—the typical assembly sequence is: base plate → reducing valve → directional valve → cover plate. Use a torque wrench to tighten mounting bolts diagonally to the torque value specified in Yuken technical manuals (01 series recommended 5–6 Nm) to prevent valve body distortion or leakage from uneven tightening.

3. Pressure Setting and Commissioning

The MRP series reducing valves are adjusted via screw with lock nut. Correct procedure: loosen lock nut → slowly rotate adjustment screw (clockwise to increase pressure, counterclockwise to decrease) → observe outlet pressure gauge until target value is reached → tighten lock nut. During commissioning, start from low pressure and gradually increase to the set value.

4. Drain Port Back Pressure Control

Back pressure at the drain port of MRP series reducing valves affects set pressure accuracy. The drain line should be routed directly back to the tank—do not connect in parallel with the return line—to ensure drain back pressure is as low and stable as possible.

5. System Cleanliness Management

The MRP series features precision pilot-operated construction and demands adequate oil cleanliness. Recommended system cleanliness: ISO 4406 Class 19/17/14 or higher. Thoroughly flush system piping prior to installation to prevent debris from blocking pilot valve orifices.

6. Periodic Functional Checks

Perform functional checks every 2,000 operating hours or annually: verify outlet pressure stability, adjustment function, and external leakage. If abnormal pressure fluctuation, sluggish response, or set pressure drift is observed, arrange for servicing or replacement.