Sun Hydraulics PVJB CXHA CACL Cartridge Valve | Pressure Control & Counterbalance

The screw-in hydraulic cartridge valves engineered by Chengyuan Hydraulic are high-fidelity, high-performance replacement elements built to fully align with Sun Hydraulics specialized cavity standard matrices (such as T-11A, T-2A, and T-10A). This robust selection spans Sun’s core functional solutions: including the PVJB direct-acting relief series, CXHA free-flow check series, CACL 3:1 pilot-ratio counterbalance series, DMDA directional solenoid control valves, and NFCD needle throttling flow valves. We prioritize 100% original-place interchangeable compatibility. Every single cartridge is validated through our 100% simulated operational load testing to analyze setting boundaries, internal leakage, and structural sealing limits under intense system pressures scaling up to 420 bar.

Technical Specifications :

• Brand Compatibility: Sun Hydraulics Equivalent Matrix

• Target Models Covered: PVJB-LAN, PVJB-LBN, PVJB-LCN, CXHA-XDN, CACL-LGN, DMDA-MNN, NFCD-LFN

• Functional Architecture Breakdown:

  • PVJB-LAN/LBN/LCN: Direct-acting relief/sequence cartridge (T-11A Cavity), Max operational rating up to 420 bar, rated flow approx. 30 L/min. Suffixes A/B/C designate distinct spring adjustment profiles.

  • CXHA-XDN: Free-flow nose-to-side check valve (T-2A Cavity), Continuous rating 350 bar, massive flow capability up to 160 L/min with minimized cracking resistance.

  • CACL-LGN: 3:1 Pilot-ratio load-holding counterbalance valve (T-11A Cavity), Operating rating 280-350 bar, flow capability 60 L/min.

  • DMDA-MNN: Solenoid-operated 2-way, 3-way directional spool cartridge, 210 bar maximum continuous envelope with multi-voltage coils.

  • NFCD-LFN: Fully adjustable precision needle flow-restrictor cartridge, providing reliable dynamic speed adjustment.

• Sealing Matrix: Standard Buna-N (NBR), optional heavy-duty Fluorocarbon (FKM) for corrosive environments.

• Required Assembly Torque: 45-50 N·m for T-11A cavities; 60-70 N·m for T-2A cavities.

Key Technical Advantages:

• Precision Duplicated Floating Style Geometry: Sun Hydraulics’ industry-leading floating cartridge philosophy demands extreme mechanical tolerances. Chengyuan utilizes sub-micron centerless grinding and precision inner-bore honing to preserve an internal clearance of 2-3 microns, successfully inheriting the design’s natural resistance to high installation torque deformation while ensuring ultra-low leakage.

• Hardened Steel Internal Valve Cores: Critical moving parts, especially within the CACL counterbalance and PVJB pressure relief cartridges, are manufactured from premium alloy steel and subjected to induction hardening (> HRC 60). This treatment eliminates erosive wear from particulate contamination in high-velocity oil streams, ensuring long-term pressure setting stability.

• Low Hysteresis Dynamic Springs: The return mechanisms in NFCD and PVJB valves are wound from premium imported piano wire and fatigue-tested over millions of cycles. The carefully calibrated spring rates minimize hysteresis during opening and closing, resulting in smooth actuation without system judder or hesitation.

• Zinc-Nickel Plating for Aggressive Environments: All exposed cartridge hex heads and adjustments are finished with a high-spec Zinc-Nickel alloy plating that survives 720+ hours of neutral salt spray testing. This premium finish ensures corrosion resistance in demanding mobile, marine, or mining fields, facilitating effortless maintenance and removal.

Application Areas:

• Mobile & Lifting Equipment: Crane outrigger lock-up circuits (via CACL counterbalance logic) and primary safety relief for pumps or hydraulic motors (PVJB & CXHA).

• Aerial Work Platforms & Lift Trucks: Micro-speed adjustment and gravity lowering drop-protection for scissor lift manifolds.

• Custom Custom Integrated Hydraulic Power Units: Complex non-standard manifold control block assemblies where space optimization is critical.

Expert Maintenance Tips:

• Tighten Strictly via Prescribed Torque Profiles: Cartridge valves are vulnerable to over-torquing. Always use a calibrated torque wrench during installation. Tighten according to the exact parameters: 45-50 N·m for T-11A and 60-70 N·m for T-2A. Over-tightening deforms the outer sleeve cage and jams the internal spool; under-torquing compromises the outer O-ring seal, causing external leaks.

• Perform Initial Safe Pressure Back-Off: For adjustable models like PVJB-LAN (typically 25-210 bar), even though they are tested at the factory, we recommend backing off the adjustment mechanism before powering up a rebuilt or newly replaced system. Once oil flows smoothly, slowly tighten to the target design pressure to prevent high-pressure spikes from shocking downstream components.

• Maintain Strict Oil Filtration Protocols: Cartridges feature small pilot damping orifices (frequently less than 0.8 mm). Contaminants can quickly clog a CACL counterbalance or PVJB relief valve, causing system failures. Always safeguard the system with inline or return-line filtration of at least 10 microns with high-efficiency glass-fiber media.