MBR-02-P1-K-20 MBR-02-P3-K-20 Modular Reducing Valve | Yuken Type Relief Valve | 02/03 Size

The MBR Series (including MBR-02 and MBR-03) by Chengyuan Hydraulic is a high-performance modular reducing valve designed for precise localized pressure control. These valves are installed as stackable components between directional valves and sub-plates, allowing a sub-circuit to operate at a stable lower pressure regardless of main system spikes. At Chengyuan, we emphasize technical authenticity; every MBR valve undergoes 100% simulated condition testing to ensure zero-leakage and precise regulation. This series provides 100% original-place interchangeability with Yuken and other major industrial standards.

Technical Specifications (Bulleted List)

• Specific Models: MBR-02-P3-K-20, MBR-02-P1-K-20, MBR-02-A2-K-20, MBR-03-P1-K-20

• Nominal Size: $02\text{ (1/4″)}$ and $03\text{ (3/8″)}$ standards

• Maximum Operating Pressure: $25\text{ MPa (3625 psi)}$

• Pressure Adj. Range (P1): $0.7\text{ to }7\text{ MPa}$

• Pressure Adj. Range (P2): $3.5\text{ to }14\text{ MPa}$

• Pressure Adj. Range (P3): $7\text{ to }21\text{ MPa}$

• Maximum Flow Rate (02): $35\text{ L/min}$

• Maximum Flow Rate (03): $70\text{ L/min}$

• Adjustment Type: K (Hand knob for precise manual control)

• Seal Material: Nitrile (NBR) or Viton (FKM)

Key Technical Advantages

• High-Precision Pilot Operation: The optimized pilot-stage design maintains secondary pressure with high repeatability even during inlet pressure fluctuations, preventing actuator instability.

• Space-Saving Modular Design: The stackable configuration eliminates the need for external piping. It mounts directly under the directional valve, reducing the manifold footprint and potential leakage points.

• Heavy-Duty Ductile Iron Body: Cast from high-strength ductile iron and precision-machined, the housing resists fatigue and deformation under continuous $25\text{ MPa}$ pulse loads.

• Contamination-Resistant Spool: The spool is super-finished with anti-clogging grooves, enhancing resistance to fine oil particulates and significantly extending the Service Life.

Application Areas

• Machine Tools: Constant pressure control for CNC chucks, tailstocks, and clamping jigs.

• Automation Lines: Maintaining local pressure stability in hybrid pneumatic-hydraulic systems.

• Molding Machinery: Auxiliary circuit regulation for injection molding and die-casting machines.

Expert Maintenance Tips

• Adjustment Direction: Rotate the knob clockwise to increase pressure and counter-clockwise to decrease it. Always tighten the locknut after adjustment to prevent pressure drift caused by vibration.

• Filtration Standards: Reducing valves are sensitive to contaminants. Maintain system oil cleanliness at NAS Class 9 or better to prevent pilot orifice blockage.

• Drain Line Back-Pressure: Ensure the system drain line is unobstructed. High back-pressure in the drain line will directly add to the preset pressure value, causing inaccuracies in the reduced pressure.