Yuken MBP MBW Series Modular Relief Valve | MBW-01-C-H MBW-02-C-H MBP-06-H-H | Hydraulic Pressure Control Valve

The MBP/MBW Series modular relief valves from Chengyuan Hydraulic are high-precision pressure control components engineered to simplify hydraulic circuit design and enhance system reliability. Fully compatible with Yuken standards, these modular valves eliminate the need for complex piping by stacking directly beneath directional valves. For core models like MBW-02-C-H and MBP-06-H-H, we utilize reinforced alloy steel spools. Every valve undergoes 100% simulated overflow stability testing before delivery to ensure minimal pressure fluctuation under continuous high-pressure conditions, guaranteeing 100% original-place interchangeability.

Technical Specification:

• Series Model: MBP (P-port relief) / MBW (A&B-port relief)

• Nominal Sizes: 01 (1/8″), 02 (1/4″), 03 (3/8″), 06 (3/4″)

• Max Operating Pressure: 25 MPa (250 bar) / 31.5 MPa (315 bar, H-type)

• Pressure Adj. Range: C (0.2-14 MPa), H (0.8-31.5 MPa)

• Max Flow Rate: 35-500 L/min (depending on size)

• Fluid Compatibility: Petroleum-based oils / Phosphate esters

• Seals: Standard NBR / Optional Viton for high-temperature resistance

Key Technical Advantages:

• Precision-Ground Spool-to-Seat Matching: Spools are crafted from high-strength alloy steel, heat-treated, and finished via ultra-precision grinding. The buffered cone design suppresses mechanical vibration and high-frequency noise during overflow.

• Superior Pressure Override Characteristics: By optimizing the spring rate-to-opening area ratio, the deviation between set pressure and actual overflow pressure is minimized, even during sharp flow surges.

• Compact Modular Construction: The stackable design removes the need for inter-valve piping, significantly reducing potential leak points and decreasing the overall footprint of the hydraulic power unit.

• Linear Adjustment Precision: The adjustment handwheel provides uniform damping and a linear tuning curve. This allows operators to achieve precise pressure increments, essential for varying load applications.

Application Areas:

• Industrial Machinery: System pressure control for injection molding, die-casting, and CNC machines.

• Mobile Equipment: Multi-way valve regulation for forklifts and mini-excavators.

• Heavy Presses: Acts as a safety valve to protect hydraulic pumps from transient overload shocks.

Expert Maintenance Tips:

• Pressure Direction: Clockwise increases pressure; counter-clockwise decreases. Always start with the pressure at the lowest setting during the first startup.

• O-ring Integrity: During stack installation, verify that the O-rings at the valve base are correctly seated and undamaged to prevent interface leaks.

• Filtration Standards: To prevent spool jamming or unstable pressure, ensure the system uses a return filter with at least 25μm precision, maintaining cleanliness at NAS Class 9 or better.