SUN Hydraulics DTDA DCFC CXDA CACA Series Cartridge Valve | DTDA-MCN DTDA-MHN | Solenoid & Check Valve

The SUN Hydraulics Compatible Cartridge Valve Series manufactured by Chengyuan Hydraulic consists of high-precision, heavy-duty fluid power control elements engineered to fully match the original design parameters of SUN Hydraulics integrated manifold architectures. This premier product line focuses on highly demanded, ready-to-ship replacement models, including the 2-way, 2-position normally closed solenoid directional valves DTDA-MCN-224 and DTDA-MHN-224 (with manual override option), the pressure-compensated flow control valve DCFC-XHN, the direct-acting check valve CXDA-XCN, and the definitive counter-balance valve CACA-LHN.

Functioning as the core neural executive unit within a multi-station custom hydraulic valve segment, a cartridge valve’s metering tolerances and seal life directly govern total circuit response and weight-holding safety. SUN cartridge valves are universally recognized for their defining Floating Construction engineering profile. Chengyuan guarantees 100% original-place drop-in interchangeability across all variants regarding standardized cavity sizing (perfectly matching SUN T-13A, T-5A, and T-2A configurations), exterior thread pitches, shoulder seating steps, and internal spring rate boundaries. Every single valve cartridge undergoes 100% load-rated actuation and cracking-pressure verification on automated digital test beds prior to packaging, ensuring smooth flow modulation and ultra-low leakage thresholds under heavy continuous duty.

Technical Specifications 

• Compatible Brand: SUN Hydraulics (USA Standard Cartridge Infrastructure)

• Target Replacement Model Codes: DTDA-MCN-224, DTDA-MHN-224, DCFC-XHN, CXDA-XCN, CACA-LHN

• Standard Cavity Designations:

  • T-13A Cavity (Optimized for DTDA series solenoid valves)

  • T-5A Cavity (Optimized for DCFC flow control valves)

  • T-2A Cavity (Optimized for CXDA check & CACA counterbalance valves)

• Nominal Flow Capacities:

  • DTDA Series: 45 L/min (12 GPM)

  • DCFC Series: 24 L/min (6 GPM)

  • CXDA Series: 40 L/min (10 GPM)

  • CACA Series: 60 L/min (15 GPM)

• Maximum Operating Pressure: 350 bar (35 MPa / 5,075 psi) continuous duty

• Solenoid Voltage Specification (for DTDA-224): Equipped with heavy-duty 24V DC waterproof coils (Code 224)

• Counterbalance Pilot Ratio (for CACA): 3:1 Standard restriction multiplier ratio

• Maximum Internal Leakage Allowance:

  • DTDA Solenoid Configurations: Max. 10 drops/minute at 350 bar threshold

  • CXDA / CACA Configurations: Absolute low leakage ($\le 5$ drops/minute) at nominal load check positions

Key Technical Advantages:

• True Dual-Stage Floating Anti-Binding Construction: Replicates and improves SUN’s signature floating cartridge architecture (concentric dual-surface isolation). Even if a manifold block’s cross-drilled cavity displays minor alignment concentricity error or experiences uneven torque loads up to 350 bar, the internal sliding spool or poppet remains isolated from exterior housing stresses, eliminating the sluggish indexing or solenoid burnouts typical of generic brands.

• High-Response Low-Wattage Solenoid Tube Assembly (DTDA Core): The wet-armature armature tube within the DTDA-MCN and MHN variants is super-finished and chemically treated against residual magnetic hysteresis, achieving rapid armature travel. Paired with high-insulation 24V DC coils, the open-to-close transition cycle speeds up to under 30ms. The MHN configuration incorporates a twist-style mechanical manual override button, allowing safe, forced actuation during sudden electrical power outages.

• Vacuum-Carbonitride Wear-Resistant Tribological Pairs: The hardened steel poppets in the CXDA check valve and the throttling spindles of the CACA counterbalance valve are machined from high-density alloy steel matrices through-hardened to HRC 60-63. This metallurgic framework delivers structural protection against high-velocity oil erosion and cavitation pitting, preventing drift in calibrated counterbalance pressure settings over millions of cycles.

• Premium Viton (FKM) Anti-Extrusion Sealing Matrix: Every cartridge valve is dressed with heavy-duty fluorocarbon (Viton) O-rings reinforced by anti-shearing Teflon backup support rings. This combination tolerates continuous operation in intense oil environments ranging from -20°C to +120°C, absorbing intense transient hydraulic pressure spikes and avoiding external oil seepage at the hex shoulder boundary.

Application Areas:

• Mobile Machinery Control Blocks: Electro-hydraulic pilot manifolds and auxiliary logic sub-blocks for industrial excavators, scissor lifts, and rough-terrain cranes.

• Load-Holding & Counterbalance Safety Loops: Winch motor control assemblies and crane boom lift cylinder lock circuits (utilizing CACA for steady load holding).

• Industrial Speed Regulation & Non-Return Networks: Speed throttle adjustments (DCFC) and flow back-check locking (CXDA) on CNC machining centers and recycling scrap balers.

Expert Maintenance Tips:

• Strict Tightening Torque Control via Calibrated Wrench: Although this entire product matrix features exceptional floating resistance against stress twisting, it is mandatory to secure the cartridges to specified torque limits during assembly. For example, T-13A cavity models (DTDA) require 45-50 Nm, while T-2A cavity models (CACA) demand 60-70 Nm. Over-tightening can deform the exterior housing threads and compromise the base interface seals.

• Solenoid Voltage Stability & Moisture Prevention: For DTDA electrical valves, ensure the machine’s supply electrical architecture delivers a stable current matching the 24V DC coil indicator. Exposure to chronic overvoltage or voltage drops can cause coil overheating and premature burnout. In outdoor or high-moisture operating sites, check the terminal block gasket seals periodically to prevent water intrusion from short-circuiting the coil.

• Rigorous Fluid Filtration Requirements: Because the internal pilot metering orifices and dampening paths inside the DCFC flow valves and DTDA directional valves measure in single-digit microns, hydraulic oil cleanliness must be held strictly at ISO 4406 19/16/13 or cleaner. Particulate metal flakes, varnish sludge, or oil oxidation byproducts will plug these pathways, leading to sudden solenoid shifting failure or counter-balance sticking.