SUN Hydraulics NCEB-LCN CVCV-XAN CSAD-XXN | Cartridge Check & Sequence Valves | Interchangeable Hydraulic Solutions

Chengyuan Hydraulic provides high-precision cartridge valves engineered as professional-grade replacements for SUN Hydraulics standards. This collection features flagship models including NCEB-LCN (Direct-acting sequence), CVCV/CVEV/CVGV/CVIV (Check valves), and CSAD-XXN (Shuttle valves). The hallmark of SUN-style valves is the “Floating Construction,” a design Chengyuan strictly replicates to ensure operational reliability even under varying installation torques. Each valve offers 100% Drop-in Interchangeability for standard SUN cavities (e.g., T-11A, T-13A, T-5A). Backed by our rigorous 100% Simulation Load Testing, these valves demonstrate exceptional sealing integrity and functional consistency under rated pressures, making them the preferred choice for high-end hydraulic integrated circuits (HIC).

Technical Specifications 

• Model Series: NCEB-LCN, CVCV, CVEV, CVGV, CVIV, CSAD

• Max Operating Pressure: 350 bar (5000 psi)

• Rated Flow (NCEB): 10 L/min (2.5 gpm)

• Rated Flow (CVCV/CVIV): 15 L/min to 160 L/min (Depending on cavity size)

• Cracking Pressure: 0.3 bar, 1 bar, 2 bar (Optional)

• Cavity Standards: T-11A (NCEB), T-13A (CVCV), T-5A (CSAD)

• Internal Leakage: Max 5 drops/min (At 350 bar)

• Seal Material: Buna-N (Standard) or Viton (High temp/Special fluids)

Key Technical Advantages:

• Floating Construction Technology: The internal working components are designed with radial clearance to self-align. This prevents spool binding caused by manifold machining tolerances or excessive installation stress.

• Hardened Impact-Resistant Seats: Manufactured from premium alloy steel with deep quenching, the seats are highly resistant to cavitation and wear during high-frequency cycles, significantly extending service life.

• Ultra-Low Internal Leakage: Precision grinding ensures micron-level fit between the poppet and seat, minimizing pressure drop in holding circuits and enhancing overall energy efficiency.

• Full-Flow Optimized Geometry: The internal flow paths are CFD-optimized to allow high flow rates with minimal pressure drop, effectively preventing excessive oil temperature rise.

Application Areas:

• Hydraulic Integrated Circuits (HIC): Ideal as screw-in components for customized manifold blocks.

• Sequential Logic Control: The NCEB series manages the operational sequence of multiple actuators.

• Load Holding: CVCV series check valves ensure reliable locking of cylinder positions.

• Pilot Signal Selection: CSAD shuttle valves are used for pilot signal logic or brake release circuits.

Expert Maintenance Tips:

• Torque Specification: Despite the floating design, always adhere to the recommended installation torque (e.g., 40-50 Nm for T-11A) to protect the threads and block.

• Cavity Cleanliness: Before installation, ensure the manifold cavity is free from machining debris or coating flakes to avoid scratching the precision sealing surfaces.

• Pressure Adjustment: For NCEB sequence valves, adjust the pressure setting gradually from low to high while monitoring actuator transitions to ensure smooth system operation.