SUN Hydraulics Cartridge Valves | CACG-LGN CABG-LHN CBEH-LIN CKCD-LCN CBCG-LJV

The SUN Hydraulics Cross-Reference Series of screw-in hydraulic cartridge valves manufactured by Chengyuan Hydraulic (including high-demand mechanical symbols CACG-LGN, CABG-LHN, CBEH-LIN, CBEH-LKN, CKCD-LCN, CKCD-XCN, CBCG-LJV, and MWIM-XKN) are premium fluid power displacement elements engineered to fully Cross-Reference the rigorous operational limits of SUN Hydraulics. Functioning across critical roles such as pilot-assisted counterbalance load holding, heavy-duty pilot-to-open check isolation, and multi-stage pressure safety monitoring, this series adopts SUN’s celebrated “Floating Style Architecture” to counter localized manifold thread distortions. Covering distinct model series, Chengyuan utilizes intense cryo-matrix quenching and sub-micron poppet-seat lap-finishing to secure 100% original-place interchangeable plug-and-play compatibility within standard SUN cavities (including T-11A and T-2A industrial geometries). Prior to distribution, every single cartridge unit undergoes 100% simulated continuous full-load loop testing, static volumetric closure tracking, and precise cracking-point profiling to secure circuit sealing defense up to 420 bar structural limitations.

Technical Specifications :

• Brand Compatibility Matrix: SUN Hydraulics Standard Cartridge Specification Equivalent

• Target Part Number Nomenclature Covered: CACG-LGN, CABG-LHN, CBEH-LIN, CBEH-LKN, CKCD-LCN, CKCD-XCN, CBCG-LJV, MWIM-XKN

• Core Model Engineering Mapping:

  • CACG-LGN Profile: Pilot-assisted counterbalance / Fits T-11A Cavity / Rated flow 60 L/min (15 GPM) / Control pilot ratio 3:1 / Range 70-280 bar / Code G adjustments / Nitrile NBR seals

  • CABG-LHN Profile: Pilot-assisted counterbalance / Fits T-11A Cavity / Rated flow 60 L/min (15 GPM) / Control pilot ratio 4.5:1 / Range 70-280 bar / Code H adjustments / Nitrile NBR seals

  • CBEH-LIN Profile: Heavy-duty counterbalance / Fits T-2A Cavity / Rated flow 120 L/min (30 GPM) / Control pilot ratio 4.5:1 / Range 140-420 bar / Code I adjustments / Nitrile NBR seals

  • CKCD-LCN Profile: Pilot-to-open check valve / Fits T-11A Cavity / Rated flow 60 L/min (15 GPM) / Pilot ratio 3:1 / Cracking pressure 2 bar / Code C adjustments / Nitrile NBR seals

  • CBCG-LJV Profile: Pilot-assisted counterbalance / Fits T-2A Cavity / Rated flow 120 L/min (30 GPM) / Control pilot ratio 4.5:1 / Range 70-280 bar / Code J adjustments / Viton FKM seals

  • MWIM-XKN Profile: High-capacity primary system/multifunctional relief control cartridge / Non-adjustable option layout / Nitrile NBR seals

• Maximum Rated Continuous Working Pressure: 350 bar to 420 bar (Model variant contingent)

• Peak System Over-Pressure Structural Surge Bound: Up to 480 bar (48 MPa)

• Standard Pilot Ratio Configurations: 3:1 and 4.5:1 calibrated parameters to avoid line hammering

Key Technical Advantages:

• Patented SUN-Style Floating Architecture Mechanical Defense: The entire collection of CACG, CBEH, and CKCD modules features the signature split floating sleeve configuration. By separating the mechanical thread engagement zone from the interior moving spool sleeve, any intense installation torque applied to the manifold block is decoupled. This layout keeps the internal tolerances clean, eliminating spool binding and pressure drift caused by out-of-round cavity defects.

• Optimized Pilot Ratios & Anti-Chitter Throttling Profiles: Counterbalance models (such as CABG and CBEH) utilize asymmetrical v-notch throttling grooves milled into the main sliding spool, coupled with exact 4.5:1 or 3:1 pilot ratios. When a heavy cylinder experiences overrunning gravitational loads, the valve manages fluid return smoothly, suppressing structural oscillation, cylinder nodding, and fluid-line shudder.

• Micro-Lapped Alloy Poppet Assemblies for Zero-Leakage Static Locking: The primary internal sealing elements for the pilot-to-open check valves (CKCD-LCN) and counterbalance cartridges are ground from premium high-grade alloy tool steel. The mating seat geometry features a sub-micron surface finish. Under high holding pressures, reverse internal migration is near zero, locking the mechanical cylinders tightly and safeguarding crane booms or vertical lift forks from drifting.

• Heavy-Duty High-Stiffness Main Control Springs & Fluid-Optimized Casing: The internal return springs are wound from premium imported spring steel alloy wire, optimized to endure millions of high-cycle pressure strokes without undergoing permanent set or relaxation. The outer steel housings are finished with a protective phosphated layer, and the internal galleries are contoured to reduce oil flow restriction and turbulence-induced heat generation.

Application Areas:

• Mobile Crane & Aerial Work Platform Safety Networks: Essential luffing, telescopic, and outrigger load-holding blocks for mobile crane grids and aerial boom lifts (CACG and CBEH series).

• Excavator Attachments & Rotary Drilling Inversions: Hydraulic grapple attachments, auxiliary thumb lockouts, and kelly-bar lift cylinder safety hold blocks for large drilling rigs.

• Industrial Automated Manifold Networks: Custom multi-station integrated block lines requiring precise directional check blocking or anti-drift safety configurations (CKCD and CBCG series).

Expert Maintenance Tips:

• Mandatorily Enforce Calibrated Torque Settings During Cavity Thread-In: Even though the floating sleeve architecture provides structural tolerance against over-tightening, maintaining specified installation torques is critical to prevent pinching the elastomeric O-rings and backup rings. Always tighten cartridges using a certified torque tool: apply 40-50 Nm for T-11A cavities (CACG, CABG, CKCD) and 60-70 Nm for larger T-2A cavities (CBEH, CBCG).

• Calibrate the Counterbalance Setting to a Minimum of 1.3 Times the Load-Induced Pressure: When commissioning or setting the cracking threshold of an adjustable counterbalance unit (e.g., CBEH-LIN), ensure the relief setting is calibrated to at least 1.3 times the maximum load-induced pressure calculated for that specific circuit branch. Setting the value too low will allow the valve to crack prematurely during normal handling, leading to unmanaged drifting or cylinder sag.

• Cross-Audit Fluid Chemical Compatibility When Deploying Viton Configurations: Suffixes such as -JV signify that the cartridge incorporates high-temperature Viton (FKM) sealing matrices. If your hydraulic system utilizes specialized phosphate ester synthetic fire-resistant fluids or runs at continuous temperatures near 100°C, these seals are required. However, when used in low-temperature mineral oil circuits, ensure fluid warm-up cycles are observed to maintain seal elasticity and ensure precise low-pressure pilot response.