SUN Cartridge Valve RVID-LAN RVCD-8WN Relief Valve | CXHA-XAN MBGM-XIN Series

The SUN Series cartridge valves from Chengyuan Hydraulic are high-precision control components fully compatible with SUN Hydraulics standards. This range includes relief valves (RVID, RVCD, RVED, RVGS), check valves (CXHA, CXCD), and load control valves (MBGM, MBEM, MWGM, SDFT). We utilize the signature “Floating Construction” design, which allows internal components to self-align within the cavity. This eliminates the risk of spool sticking caused by over-torquing during installation or manifold machining errors. Every valve undergoes 100% simulated opening pressure and internal leakage testing to guarantee superior linearity and reliability at 350 Bar, ensuring 100% original-place interchangeability.

Technical Specifications :

• Relief Valve Models: RVID-LAN, RVCD-8WN, RVED-8WN, RVGS-LAN

• Check Valve Models: CXHA-XAN, CXCD-XAN

• Load Control & Specialty: MBGM-XIN, MBEM-XIN, MWGM-XIN, SDFT-LCN

• Max Operating Pressure: 350 bar (35 MPa)

• Flow Rate Capacity: Ranges from 1 L/min to 200 L/min depending on Frame Size (Series 0, 1, 2)

• Adjustment Options: L (Standard Screw), C (Cap), K (Knob)

• Pressure Range Codes: A (100 – 3000 psi / 7 – 210 bar), B (50 – 1500 psi)

• Material Finish: Hardened bearing steel internals with electroless nickel plating for corrosion resistance

Key Technical Advantages:

• Floating Construction: The hallmark of SUN style valves. This design allows the valve to function perfectly even if the cavity is not perfectly concentric or if thermal expansion occurs. It prevents mechanical stress from seizing the spool, drastically increasing system uptime.

• Extended Adjustment Stroke: For relief models like RVID-LAN, the optimized spring rates provide a wide adjustment range with excellent linearity. This allows for ultra-fine pressure tuning with a smooth, responsive feel.

• Contamination Resistance: The internal flow paths and seat geometries are designed to be self-cleaning. This minimizes the accumulation of fine particles, extending the maintenance intervals in harsh industrial or mobile environments.

• Two-Stage Precision: Pilot-operated models like the RVGS series offer high-sensitivity response with a very low pressure-rise rate. This provides superior protection for downstream pumps and sensitive sensors against sudden spikes.

Application Areas:

• Custom Manifolds: System relief, sequence control, and logic functions in HPU blocks.

• Mobile Machinery: Outrigger locking, pilot control circuits, and steering priority.

• Industrial Presses: Accurate pressure regulation and consistent pressure holding.

• Agricultural Equipment: Loader bucket balancing and auxiliary circuit protection.

Expert Maintenance Tips:

• Torque Compliance: While the floating design is forgiving, always use a torque wrench to meet OEM specifications to ensure the optimal lifespan of O-rings and backup rings.

• Adjustment Screw Protection: For L-type adjustment screws in outdoor settings, keep the adjustment area clean and consider protective caps to prevent rust from seizing the threads.

• Seal Suffix Verification: Ensure the seal suffix—”N” for Buna-N or “V” for Viton—matches your system’s operating temperature and fluid compatibility before installation.