Yuken MG-02P Series Modular Pressure Reducing Valve | MG-02P-1-50 MG-02P-2-55 | Hydraulic Valve

The Yuken MG-02P Series premium modular pressure reducing valves manufactured by Chengyuan Hydraulic are high-efficiency fluid power regulation components engineered to thoroughly match the rigorous design specifications of Yuken Hydraulics. This highly demanded modular stack alternative lineup directly covers critical factory control designations including MG-02P-1-50 (low-pressure calibration segment), MG-02P-2-55, MG-02P-3-55 (high-pressure heavy-duty segment), MG-02P-03-50, MG-02P-2-50, and MG-02P-3-50.

Operating as the primary secondary-pressure gate within the sub-loops of CNC lathe chucks, automated clamping fixtures, and heavy industrial multi-station manifolds, a modular valve’s setting stability governs the working precision of secondary actuators. Chengyuan guarantees 100% original-place drop-in interchangeability across all units regarding standardize interface footprints (fully complying with standard ISO 4401-AB-03-4-A, CETOP 3, or size NG6 specifications), mounting tie-rod hole centers, and internal sliding spool metering land alignments. Every single assembly undergoes 100% full-load regulation qualification and cracking performance testing on automated digital benches before distribution, maintaining tight hysteresis variables under continuous 25 MPa industrial loading.

Technical Specifications 

• Compatible Brand: Yuken (Industrial Modular Stack Valve Technology)

• Target Replacement Model Codes: MG-02P-1-50, MG-02P-2-55, MG-02P-3-55, MG-02P-03-50, MG-02P-2-50, MG-02P-3-50

• Interface Standard Footprint: ISO 4401-AB-03-4-A / CETOP 3 / NG6 nominal size

• Regulated Flow Line: Port P line restriction (Sustains dedicated pressure reduction on main inlet line only)

• Maximum Allowable Flow Volume: 35 L/min

• Maximum System Operating Pressure: 25.0 MPa (250 bar / 3625 psi)

• Pressure Adjustment Range Designations:

  • Code 1 (e.g., MG-02P-1-50): 0.7 – 7.0 MPa (Low-pressure fine tuning)

  • Code 2 (e.g., MG-02P-2-55): 3.5 – 14.0 MPa (Medium-pressure versatile duty)

  • Code 3 (e.g., MG-02P-3-55): 7.0 – 21.0 MPa (High-pressure heavy loading)

• Total Modular Assembly Weight: Approx. 1.3 kgs (2.86 lbs)

Key Technical Advantages:

• Super-Finished Mirror-Polished Sliding Spool Assembly: The primary internal reducing spool is machined from premium high-density chromium alloy steel. Treated via multi-stage vacuum oil-quenching matched with micro-precision mirror finishing, the single-side radial clearance between the spool and bore is held to tight tolerances. This configuration provides resistance against fluid varnish sticking, keeping pressure response times under 25ms.

• Fatigue-Resistant High-Tensile Silicon-Chromium Springs: The core pressure-regulating spring situated inside the rear adjustment enclosure has been qualified through continuous stress cycling tests to ensure high resistance against spring relaxation. Even when held under a continuous peak load of 21.0 MPa, the spring rate remains uniform, eliminating the common problem of secondary pressure downward drift during extended machine runtime.

• CFD Hydrodynamic Sculpted Casting for Low Temperature Rise: The main body housing block is poured using high-strength HT300 cast iron formed through resin-bonded sand processes, with interior galleries mapped using Computational Fluid Dynamics (CFD). This layout minimizes localized fluid turbulence and drop resistance under maximum flow velocities, reducing heat generation within multi-valve sandwich stacks.

• Tamper-Resistant Hex Screw Manual Adjuster with Locknut: The pressure setting regulator utilizes fine-pitch threads for seamless micro-adjustments across the targeted spring range. Equipped with a heavy-duty hexagonal locking nut, operators can lock in the designated sub-circuit clamping force or pressure threshold, preventing setting drift caused by continuous vibrations from high-tonnage shears or stamping presses.

Application Areas:

• High-Precision CNC Machine Tool Fixtures: Powering hydraulic latches, indexing tables, chuck clamps, and automated work-holding setups requiring stable low-pressure sub-circuits.

• Metal Sheet Stretching & Cold Roll Forming Lines: Supplying dedicated, non-fluctuating secondary fluid power lower than the primary system setting to ejector cylinders and side-blank holders.

• Multi-Station Automated Special Purpose Machinery: Managing sequential pressure steps or low-pressure delay circuits between multiple working cylinder groups within a centralized manifold loop.

Expert Maintenance Tips:

• Rigid Control of Tie-Rod Bolt Torque on Sandwich Stacks: As the MG-02P is a modular sandwich-style valve, it must be clamped down to the subplate via long tie-rods that pass through multiple housings. These structural bolts must be systematically torqued down in balanced diagonal stages using a calibrated wrench, strictly holding the final setting for NG6 (Size 02) threads at 5-7 Nm. Over-torquing can cause minor housing distortion that jams the precision spool, while under-torquing leads to external fluid leaks at the inter-valve O-ring joints.

• Case Drain Port Backpressure Verification: During operation, the pilot control fluid within the spring adjustment chamber vents back to the reservoir via the internal drain paths leading to the T (Return) line. Consequently, the baseline backpressure inside the downstream return line must be kept below 0.2 MPa. If the line is restricted, the pilot chamber cannot depressurize properly, causing the secondary pressure to match the high primary pressure regardless of adjuster settings.

• Fluid Contamination Prevention Against Orifice Plugging: The sliding spool features microfluidic balance notches and damping orifices measuring under 1 mm in diameter. Total system fluid cleanliness must be held at or above ISO 4406 20/18/15. Allowing microscopic metal particulates or sludge to settle in the fluid will clog these paths, causing sudden pressure spikes, loss of regulation, or high-frequency chattering acoustics.