Sun Hydraulics PBFB-LAN DCEC-XCN Solenoid Cartridge Valve | Direct Acting Relief & Flow Control

Chengyuan Hydraulic offers a premium range of threaded cartridge valves engineered as direct, high-quality replacements for Sun Hydraulics standards. This series includes the PBFB-LAN pilot-operated pressure reducing valve, the DCEC-XCN proportional flow control valve, and various directional controls like DCFD, DCFC, and DCED. Known for the iconic “Floating Style” design, Sun-style cartridges prevent internal binding caused by excessive installation torque. Chengyuan ensures 100% Drop-in Interchangeability regarding cavity dimensions, thread specs, and hydraulic performance. Supported by our 100% Simulation Load Testing, each valve is validated for high-pressure leakage and dynamic response, ensuring reliable operation in mobile and industrial manifolds.

Technical Specifications 

• Compatible Brand: Sun Hydraulics

• Model Reference: PBFB-LAN (Reducing) / DCEC-XCN (Proportional Flow)

• Cavity Standard: T-11A (PBFB) / T-5A (DCEC)

• Rated Flow: 40 L/min (PBFB) / 60 L/min (DCEC)

• Max Operating Pressure: 350 Bar (35 MPa)

• Adjustment Range (L): 7 – 210 Bar

• Control Type: Solenoid-Pilot / Manual / Proportional

• Seal Material: Buna-N (Standard) / Viton (Optional)

• Coil Voltage: DC 12V / 24V (Sold separately)

Key Technical Advantages:

• Two-Stage Floating Construction: Following Sun’s engineering philosophy, the internal parts do not contact the outer sleeve directly. This maximizes tolerance to installation torque and ensures consistent spool movement even in complex integrated manifolds.

• Ultra-Precision Lapped Spools: Spool and seat components are crafted from high-hardness alloy steel (HRC 60+) and precision-lapped. This guarantees extremely low internal leakage (typically <5 drops/min @ 210 Bar), ideal for load-holding circuits.

• High Dynamic Response: Optimized pilot circuits and electromagnetic force matching provide valves like the DCEC series with excellent linearity and minimal hysteresis, crucial for fine-tuning actuator movements.

• Corrosion-Resistant Finish: Exposed parts are trivalent zinc-plated or black-oxidized, offering superior salt spray resistance (>96h), making them suitable for marine and harsh outdoor environments.

Application Areas:

• Mobile Equipment: Pilot oil control in excavators and load-sensing systems in loaders.

• Lifting Machinery: Crane outrigger locking and smooth control for aerial work platforms.

• Industrial Presses: Combined pressure and flow regulation for precision presses.

• Agriculture: Tractor hitch systems and harvester manifold blocks.

Expert Maintenance Tips:

• Torque Management: Always use a torque wrench for installation. While the floating design is robust, excessive torque can damage O-rings, while insufficient torque leads to external leaks.

• Contamination Control: Cartridge valves feature micron-sized pilot orifices. Fluid cleanliness must be maintained at ISO 4406 18/16/13 or better to prevent clogging and extend service life.

• Coil Protection: For solenoid-controlled models (DCEC/DCFD), ensure the connector is properly sealed to prevent moisture ingress, which can lead to coil insulation failure.