Yuken MG-02P Series Modular Pressure Reducing Valve | MG-02P-1/2/3-55

The MG-02P Series modular pressure reducing valves manufactured by Chengyuan Hydraulic are high-performance control components engineered to match the technical benchmarks of Yuken. This series covers universal configurations including MG-02P-1-55, MG-02P-2-55, and MG-02P-3-55, as well as the 50-design sequence.

As a modular stack-type valve, the MG-02P is installed between a directional solenoid valve and a subplate to reduce the local pressure of the P-line within an integrated hydraulic circuit. This compact design eliminates the need for extra piping, significantly reducing the system’s footprint. Chengyuan ensures 100% original-place interchangeability regarding mounting patterns (ISO 4401-03) and pressure-flow regulation curves. Each valve undergoes 100% simulated high-pressure load testing to guarantee ultra-stable secondary pressure output even amidst primary flow fluctuations.

Technical Specifications :

• Brand Compatibility: Yuken MG-02P Series Replacement

• Model Codes: MG-02P-1-55, MG-02P-2-55, MG-02P-3-55

• Pressure Adjustment Ranges:

  • Code 1: 0.7 – 7 bar (0.7 – 7 MPa)

  • Code 2: 3.5 – 70 bar (3.5 – 70 MPa)

  • Code 3: 3.5 – 140 bar (3.5 – 140 MPa)

• Max Inlet Pressure (Primary): 250 bar (25 MPa)

• Maximum Flow Rate: 40 L/min

• Nominal Size: NG6 (CETOP 3 / 02 Size)

• Regulation Method: Manual knob with lock-nut

• Control Line: Pressure reduction on P-line

• Sealing Material: High-performance NBR (Buna-N) or Viton (FKM)

Key Technical Advantages:

• High-Response Pilot-Operated Architecture: The MG-02P utilizes a precision pilot piston design. When primary pressure fluctuates, the pilot valve reacts instantaneously to adjust the main spool position, maintaining secondary pressure stability within $\pm 0.2$ MPa for consistent actuator performance.

• Stackable Piping-Free Design: Utilizing the standard NG6 interface, this “building block” installation style eliminates complex piping and reduces potential leak points at fittings, greatly simplifying hydraulic power unit maintenance.

• Wear-Resistant Alloy Spool Technology: The spool and body are precision-ground with tight clearances. Spools undergo specialized hardening heat treatments to resist wear and particle contamination, ensuring minimal internal leakage even at 250 bar.

• High-Linearity Adjustment Knob: Features a precision-calibrated internal spring for a linear and smooth adjustment feel. The reinforced lock-nut ensures the pressure setting remains stable even under severe mechanical vibration.

Application Areas:

• Industrial Fixture Systems: Providing stable low-pressure power for specific clamping cylinders in multi-actuator circuits.

• CNC Machine Tools: Handling pressure stage control for spindle balance circuits or tool magazine indexing.

• Plastic Machinery: Auxiliary constant pressure protection for injection mechanisms or safety door control loops.

Expert Maintenance Tips:

• Monitor Drain Line Back-Pressure: As a reducing valve, the drain is typically connected internally to the T-line. Ensure T-line back-pressure is kept as low and stable as possible; high back-pressure will cause the secondary pressure to rise uncontrollably.

• Strict Fluid Cleanliness: Because pilot orifices are extremely small, system filtration must be maintained at 10 $\mu m$ or better. Microscopic debris can clog the pilot port, leading to pressure regulation failure.

• Initial Setting Protocol: During initial commissioning, turn the knob counter-clockwise to the lowest setting before starting the pump. Gradually turn clockwise to reach the target pressure once the system is air-free.