Atos PPGEE-6 & DPGEE-10 Proportional Valve

The industrial-grade PPGEE-6 and DPGEE-10 Series High-Performance Digital Proportional Pressure Reducing Valves (focusing on high-tier global B2B reference models PPGEE-6-180-D24-A1, PPGEE-6-180-D24-A1-15C, and the pilot-operated DPGEE-10-2B2B-75-D24-A1-15C paired with advanced DPGEE 10 2B2B 75 D24 A1+DF3 smart electronics), manufactured by Chengyuan Hydraulic, are electro-hydraulic control components engineered for continuous, high-precision, and dynamically responsive pressure regulation in closed-loop systems. Designed with standard modular subplate patterns, the PPGEE-6 series adheres to the ISO 4401-03 (Size 6 / Cetop 3) standard, while the DPGEE-10 series aligns perfectly with the ISO 4401-05 (Size 10 / Cetop 5) interface footprint.

Chengyuan’s digital proportional valves deliver 100% direct drop-in interchangeability with global industry benchmarks (such as Italian Atos engineering standards). From external geometry, mounting bolt locations, proportional solenoid static-to-dynamic metrics, to the 7-pin or 12-pin electrical connector pinout protocols (A1/DF3), these elements integrate directly into existing automation configurations. Re-builders and machinery OEMs can execute on-site retrofits without modifying physical manifolds or altering PLC control software analog/digital command profiles.

As the central control nodes in sophisticated electro-hydraulic networks, proportional pressure reducing valves dictate the system’s tracking precision and pressure stability. Internal spool friction, excessive magnetic hysteresis, or thermal electronic drifting can cause pressure fluctuations, response lag, or unstable execution. To ensure field reliability, 100% of Chengyuan’s PPGEE and DPGEE valves undergo 100% strict electro-hydraulic integration and dynamic test bench validation. Evaluated on full-digital proportional test stands, each valve is verified not only for static $P-I$ (Pressure-Current) curves and hysteresis but also under continuous multi-load cycles to ensure high linearity and dynamic stability in demanding applications.

Technical Specifications

• Product Classification: Digital Electro-Hydraulic Proportional Pressure Reducing Valve (Direct-Acting 3-Way / Pilot-Operated)

• Nominal Interface Sizing (Size):

  • PPGEE-6 Variants: Size 06 (ISO 4401-03 / Cetop 3 Standard Subplate Pattern)

  • DPGEE-10 Variants: Size 10 (ISO 4401-05 / Cetop 5 Standard Subplate Pattern)

• On-Board Driver / Electronic Configuration:

  • Code A1: Integrated basic digital driver with analog input interface (Voltage/Current command).

  • Code DF3: Advanced integrated digital driver supporting real-time parameter tuning via software interface (Custom electronic ramps, PID gain mapping).

• Maximum Main Port Operating Limit: Up to 35.0 MPa (350 bar / 5075 psi)

• Regulated Pressure Boundaries (Max. Reduced Pressure):

  • 180 Calibration: Adjustable pressure threshold up to 18.0 MPa (180 bar)

  • 75 Calibration: Adjustable pressure threshold up to 7.5 MPa (75 bar)

• Maximum Permissible Flow Capacity:

  • PPGEE-6 Direct-Acting: Up to 45 L/min (11.8 gpm)

  • DPGEE-10 Pilot-Operated: Up to 160 L/min (42.2 gpm)

• Input Power Requirement: Standard 24 VDC Stabilized Direct Current Supply (Code D24)

• Core Electronic Functional Standards: Hysteresis $\le 1.5\%$; Linearity error $\le 1.0\%$; Repeatability tolerance $\le 1.0\%$

• Technical Model Code Deconstruction:

  • Model Reference: PPGEE-6-180-D24-A1

    • PPGEE-6: Direct-acting 3-way proportional pressure reducing configuration, Size 6.

    • 180: Maximum regulated scale threshold set to 180 bar.

    • D24-A1: Powered via 24 VDC with on-board basic analog-digital driver electronics.

  • Model Reference: DPGEE-10-2B2B-75-D24-A1-15C

    • DPGEE-10: Two-stage pilot-operated proportional pressure reducing design, Size 10.

    • 2B2B: Specifies specialized main spool overlay matching and internal pilot/drain fluid paths.

    • 75: Regulated pressure scale maximized at 75 bar.

    • 15C: Integrates customized factory preset electronic control slopes or specific ramp metrics.

Key Technical Advantages

• Micro-Honed Spool and Sleeve Matrix ($2\sim 3\mu\text{m}$ Clearence): The main regulating spool and sleeve assemblies are machined from high-alloy steel, undergoing vacuum induction hardening and cryogenic thermal tempering. Using high-precision cross-honing machinery, the mating clearance is held to a $2\sim 3\mu\text{m}$ boundary. This minimizes internal null-point cross-port leakage at 350 bar and completely eliminates stick-slip behavior during micro-signal adjustments.

• Low-Hysteresis Wet-Pin Proportional Solenoid: The proportional armature operates fully enclosed within a high-pressure fluid-filled cavity, providing excellent heat dissipation and natural hydraulic dampening. The magnetic conductors undergo vacuum annealing to restrict magnetic hysteresis errors to under 1.5%, ensuring an exceptionally linear relationship between input current and output electromagnetic force.

• Ruggedized Integrated On-Board Electronics (OBE Circuits): Circuit modules are mounted directly to the valve chassis and sealed with high-grade, vibration-proof epoxy resins (IP67 protection rating). Powered by high-speed microprocessors, the electronics feature automatic thermal drift compensation, coil over-current safeguards, and digital deadband compensation, resulting in an step-response time of $\le 45 \text{ ms}$.

• Anti-Cavitation CFD Streamlined Valve Cast Body: Cast from high-grade ductile iron, the internal flow passages are optimized using Computational Fluid Dynamics (CFD). Even under severe pressure drops (e.g., from 350 bar down to 75 bar), the geometry suppresses turbulent cavitation and fluid shearing noise, lowering total system operating noise by over 12 dB.

Application Areas

PPGEE-6 and DPGEE-10 series digital proportional valves are key components in hydraulic circuits requiring precise pressure profiling, closed-loop tension regulation, or multi-stage pressure ramping:

• High-End Plastic Injection Molding & Die-Casting Machines: Governing the critical packing/holding pressure stage and clamping force regulation.

• Metallurgical Strip Mills & Steel Processing Lines: Real-time tension management on unwind/rewind mandrels and continuous roll-nip pressure tracking.

• Heavy Industrial Press Braking Systems: Functioning as the high-response pilot pressure stage for large-scale cartridge logic blocks, ensuring smooth electronic ramp control during heavy stamping operations.

Expert Maintenance Tips

• Verify 24 VDC Power Regulation Accuracy and Ensure Control Cabling Shields are Grounded at One End: The on-board digital electronics (A1/DF3) are sensitive microelectronic assemblies. Severe electromagnetic interference or voltage surges can corrupt digital logic arrays or damage internal components. Control lines must utilize shielded twisted-pair wiring, and hot-swapping the 7-pin or 12-pin primary electrical plug while powered is strictly prohibited to prevent driver board failure.

• Thoroughly Bleed Entrapped Air Via the Bleeding Screws Before Running the Pilot-Operated DPGEE-10 Valve: Trapped air inside a proportional control loop will cause compressibility anomalies, which can trigger high-frequency pressure oscillations, audible screaming, or erratic control during fast step adjustments. Bleed the circuit at low pressure under low-frequency signal cycles until the oil escaping from the bleed port is free of air bubbles, then secure the screw.

• Maintain Hydraulic Fluid Cleanliness at ISO 4406 18/15/12 (NAS Class 7) or Better with 10-Micron Absolute Filtration: The precision land edges, control orifices, and pilot stages of proportional valves are sensitive to particulate contamination. Fine debris or varnish buildup can cause spool binding or electrical erosion on precision surfaces, leading to degraded pressure linearity and control distortion.