SUN Hydraulics Cartridge Valves | RVGD RVID RVCD RVED Relief Valve | PPDB PBBB CKCD

The SUN Series Cartridge Valves by Chengyuan Hydraulic are high-precision components designed for high-pressure integrated hydraulic systems. This range includes pressure relief, reducing/relieving, check, and counterbalance valves, all fully compatible with SUN Hydraulics technical standards—including models RVGD, RVED, PPDB, and CBCA. Our valves utilize high-strength alloy steel with vacuum heat treatment to ensure superior sealing under frequent high-pressure impacts. Featuring 100% original-place interchangeability and having passed 100% simulated condition testing, these valves offer exceptional pressure stability and flow regulation, making them the premier choice for hydraulic manifold assembly and maintenance.

Technical Specifications :

• Representative Models: RVGD-LAN, RVED-LAN, PPDB-LNN, CBCA-LHN, CKCD-LCN

• Max Operating Pressure: Up to $35\text{ MPa (350 bar / 5000 psi)}$

• Flow Capacity: From $15\text{ L/min}$ to $480\text{ L/min}$ depending on size (e.g., RVED approx. $45\text{ L/min}$)

• Adjustment Options: L (Standard Screw), K (Handknob), C (Tamper Resistant)

• Standard Cavities: T-8A, T-10A, T-11A, T-13A, T-19A (fully SUN compatible)

• Seal Material: NBR (Standard) or FKM (Viton)

• Pressure Ranges: Range A (100–3000 psi), Range B (50–1500 psi), etc.

• Response Time: $\le 10\text{ ms}$ (Relief Valve types)

Key Technical Advantages:

• Floating Construction: Following the SUN design philosophy, our valves allow internal components to self-align within the cavity. This prevents internal parts from binding due to excessive installation torque or minor machining errors in the manifold, ensuring reliable operation under all conditions.

• Vacuum Heat Treatment: Spools and seats are manufactured from premium tool steel and subjected to vacuum quenching, achieving a surface hardness of HRC 60-62. This process ensures extreme resistance to erosion and wear, even in systems with slight fluid contamination.

• High-Flow, Low-Pressure Drop Channels: Internal passages are optimized using CFD software to minimize flow resistance. Compared to generic cartridges, our valves reduce heat generation at equivalent flow rates, enhancing overall system efficiency.

• Precise Linear Regulation: Fine-thread adjustment screws provide a highly linear pressure gradient. This allows operators to set target pressures with pinpoint accuracy and minimal hysteresis during system commissioning.

Application Areas:

• Construction Machinery: Auxiliary pressure control for excavators and wheel loaders.

• Hydraulic Power Units: High-density manifolds for aluminum extrusion presses and injection molding machines.

• Mining Equipment: Overpressure protection and load holding for hydraulic roof supports.

Expert Maintenance Tips:

• Torque Control: Always use a torque wrench for installation. Strictly adhere to recommended values (e.g., 40-50 Nm for T-10A) to prevent seal extrusion or mechanical stress on the valve body.

• Adjustment Security: Once the desired pressure is set, tighten the locknut and replace the protective cap to prevent set-point drift caused by vibration.

• Air Bleeding: For reducing valves (like the PPDB series), ensure the system is fully bled before the initial run. Trapped air can lead to pressure instability or high-frequency “chatter” noise.