SUN Hydraulics Cartridge Valve | DSEO DSEH Proportional | CSAZ CDAB Relief | NFBC NFEC

The SUN Hydraulics Series cartridge valves from Chengyuan Hydraulic are high-end control components specifically engineered for mobile machinery and hydraulic integrated manifolds. This comprehensive range includes electro-proportional throttle valves (DSEO-XCV, DSEH-XGN), counterbalance valves (CSAZ-XXN), pilot-operated relief valves (QPAB-LBN, CDAB-XBV), and flow control valves (NFBC-LCN, NFEC-LEN). SUN’s unique “Floating Design” allows the internal parts to self-align within the cavity, eliminating the risk of spool binding caused by manifold machining errors. Every cartridge valve from Chengyuan undergoes 100% dynamic performance testing under simulated conditions, ensuring exceptional linearity and frequency response under high pressure, providing 100% original-place interchangeability.

Technical Specifications :

• Proportional Throttle Models: DSEO-XCV (Flow $15\text{ L/min}$), DSEH-XGN (Flow $30\text{ L/min}$)

• Pilot Relief Models: QPAB-LBN (Rapid response), CDAB-XBV (Remote control capable)

• Counterbalance Model: CSAZ-XXN (Load holding & motion control)

• Flow Control Models: NFBC-LCN (Fully adjustable), NFEC-LEN (High-flow throttle)

• Max Operating Pressure: $350\text{ bar (35 MPa / 5075 psi)}$

• Cavity Standards: T-8A, T-10A, T-13A, T-5A (Model dependent)

• Control Voltage: $12\text{V/24V DC}$ for proportional solenoids

• Adjustment Types: L (Standard Screw), X (Factory Preset / Non-adjustable)

• Fluid Compatibility: Mineral-based oils; Phosphate esters (with Viton seals)

Key Technical Advantages:

• Proprietary Floating Construction: The core advantage of the SUN series. The valve internals float within the sleeve, tolerating minor manifold deformation or misalignment. This ensures smooth spool movement even at maximum installation torque.

• Superior Proportional Linearity: For DSEO and DSEH valves, we have minimized hysteresis in the solenoids. Driven by precise amplifiers, they offer micro-amp level adjustment, perfect for high-precision actuator speed control.

• Two-Stage Pilot Relief Technology: Models like QPAB and CDAB feature two-stage pilot structures with minimal pressure overshoot and rapid response, effectively protecting pumps and cylinders from transient high-pressure spikes.

• Fully Hardened Spools & Seats: All throttling and relief components are made from high-strength alloy steel and deep-hardened to HRC 60+. This ensures long-term erosion resistance even when operating with contaminated hydraulic fluids.

Application Areas:

• Construction Machinery Boom Control: Utilizing CSAZ counterbalance valves for stable load holding and vibration-free descent.

• Hydraulic Proportional Systems: Using DSEO/DSEH for velocity control in cranes, drill rigs, and automated loaders.

• Compact Power Units: Pressure and flow regulation in injection molding auxiliary circuits and small hydraulic power stations.

Expert Maintenance Tips:

• Torque Specification: Strictly follow the torque values (e.g., $40\text{–}50\text{ Nm}$ for T-10A cavities). Under-torquing leads to external leaks; over-torquing might crush the seals, though the floating design prevents spool binding.

• Proportional Valve Bleeding: For DSEO/DSEH models, run the system at low pressure after installation to bleed air from the solenoid chamber, avoiding control lag or “hunting.”

• Cleanliness Level: Proportional and pilot-operated valves are sensitive to particles. System filtration must be maintained at $10\mu\text{m}$ (ISO 4406 18/16/13) or better to guarantee precision.