Sun Hydraulics Pressure Reducing & Check Valves | CXDA CSAB CKEB CNHC CNJC

The high-performance threaded cartridge valve series provided by Chengyuan Hydraulic is fully benchmarked against the industrial standards of Sun Hydraulics (USA). This range includes critical pressure and directional control components such as CXDA (pilot-to-open check), CSAB (direct-acting sequence), and CKEB/CNHC/CNJC pressure-reducing models.

The unique “Floating Construction” is the soul of Sun Hydraulics’ cartridge valves. Chengyuan strictly adheres to this engineering standard during manufacturing, ensuring that internal parts will not bind even if excessive installation torque is applied. Our products offer 100% original-place interchangeability. Every valve cartridge undergoes 100% simulated load testing to ensure precise pressure regulation and reliable shut-off functionality in high-pressure systems.

Technical Specifications 

• Cavity Compatibility: Sun Hydraulics T-11A / T-2A / T-10A standards

• Model Code Definitions:

  • CXDA-XAN: Pilot-to-open check valve

  • CSAB-XXN: Direct-acting sequence valve

  • CKEB-XCN: Pilot-operated pressure reducing valve

  • CNHC/CNJC: Pressure compensator / Flow control elements

• Max Operating Pressure: 350 bar (5000 psi)

• Control Pressure Range: 2 – 200 bar (depending on spring configuration)

• Maximum Flow Capacity: 30 L/min – 120 L/min (size dependent)

• Internal Leakage: 0.3 cc/min at 70 bar differential

• Valve Material: High-strength steel with surface hardening treatment

Key Technical Advantages:

• Floating Spool Design: Chengyuan strictly replicates the floating architecture, allowing self-centering compensation between the sleeve and moving parts. This prevents binding caused by manifold port distortion, ensuring ultra-sensitive response.

• Precision Spool Honing: The sliding spools for reducing valves (like CKEB) are honed to micron-level clearances. This precision ensures extremely stable output pressure for motor or cylinder sub-circuits, with minimal hysteresis and drift.

• Contamination & Shock Resistance: Featuring high-rigidity springs and hardened alloy steel seats, these valves are less sensitive to fine particles and exhibit superior fatigue life in mobile machinery subject to frequent hydraulic shocks.

• Compact Threaded Cartridge Installation: Fully compliant with standard Sun cavities, saving manifold space and reducing maintenance costs—simply unscrew the cartridge for quick replacement without disturbing the piping.

Application Areas:

• Mobile Equipment Attachments: Pressure reducing control for excavator grapples, shears, and other auxiliary tools.

• Industrial Presses: Used as sequence control elements (CSAB) in multi-cylinder synchronization or pressure-holding circuits.

• Heavy Hoisting Equipment: Critical check elements (CXDA) in load-holding or emergency shut-off systems.

Expert Maintenance Tips:

• Strict Torque Compliance: Despite the floating design, always use a torque wrench to install valves to the specified values (e.g., 40-50 Nm for T-11A) to prevent manifold thread damage.

• Pressure Adjustment Protocol: When setting pressure, loosen the locknut first and rotate the adjustment screw smoothly. Always tighten the locknut once set to prevent settings from shifting due to vibration.

• O-ring Inspection: Since the cartridge head is exposed, periodically check external NBR or FKM seals for aging or wear to prevent external leakage in harsh environments.