Sun Hydraulics 1CE300 & 1DR30 Series Cartridge Valve | Pressure Reducing & Counterbalance

The 1CE300 and 1DR30 series screw-in cartridge valves by Chengyuan Hydraulic are high-performance engineering alternatives designed to fully align with Sun Hydraulics industrial standards.

• The 1CE300 series functions as a load-reactive counterbalance valve, crucial for controlling overrunning loads and ensuring fail-safe protection for hydraulic cylinders.

• The 1DR30 series is a direct-acting pressure reducing/relieving valve, maintaining consistent secondary circuit pressure regardless of primary fluctuations. We emphasize 100% physical and functional interchangeability. Every cartridge undergoes 100% simulated load testing prior to shipment to verify cracking pressure, internal leakage, and dynamic response, ensuring reliable operation at high-pressure ratings up to 420 bar.

Technical Specifications :

• Product Series: 1CE300 (Counterbalance) / 1DR30 (Reducing/Relieving)

• Model Designations: 1CE300F35S8, 1DR30-P-10S, 1DR30-P-20S, 1DR30-P-40S-SP130BAR

• Max. Operating Pressure: 420 bar (6000 psi)

• Pilot Ratio (1CE300): 3:1 (Optimized for stability and smooth descent)

• Rated Flow (1CE300): ~60 L/min (15.8 gpm)

• Rated Flow (1DR30): ~30-40 L/min (8-10 gpm)

• Pressure Adjustment Range (1DR30): From 10 bar, 20 bar, 40 bar up to specialized 130 bar settings

• Installation Torque: 45-50 N·m (For Sun T-11A cavity compatibility)

• Internal Leakage: < 5 drops/min (At 85% of nominal pressure setting)

• Materials: High-tensile steel body; heat-treated/ground internal components; Zinc-Nickel external plating

Key Technical Advantages:

• Precision Lapped Seating for Zero-Drift: Our internal poppets and seats are matched using sub-micron lapping processes. This ensures ultra-low leakage under heavy load, effectively preventing unintended drift in hydraulic actuators like crane booms.

• Nitrided High-Resilience Spools: For the 1DR30 reducing series, spools are nitrided after quenching to provide extreme erosion resistance. This maintains setting accuracy over long cycles of high-frequency relief, eliminating pressure hysteresis.

• Vibration Damping Architecture: The 1CE300 counterbalance valves feature optimized damping orifices to absorb hydraulic shocks from mechanical inertia. The 3:1 pilot ratio provides responsive opening while eliminating “hunting” or oscillation during descent.

• Aggressive Environment Protection: Standard Chengyuan cartridges feature Zinc-Nickel plating, passing 720-hour salt spray tests. This provides superior corrosion resistance in maritime or mining environments compared to standard zinc plating.

Application Areas:

• Mobile Cranes & Aerial Platforms: Critical for load holding and controlled lowering.

• Agricultural Machinery Auxiliaries: Precision pressure reduction for sensitive attachments.

• Compact Manifold Blocks: Space-efficient pressure distribution in industrial HPU systems.

Expert Maintenance Tips:

• Strict Adherence to Torque Specs: Cartridge valves are sensitive to over-tightening. Always use a torque wrench during installation. Excessive torque can deform the T-11A cavity, leading to spool binding. Recommended torque for these series is 45-50 N·m.

• Account for System Backpressure: For models with the SP130BAR suffix, always calibrate the setting in-situ. Since backpressure at the return port increases the setting at a 1:1 ratio, secondary adjustments may be necessary for peak accuracy.

• Maintain Fluid Integrity: Cartridge orifices are extremely fine. Ensure the system maintains ISO 4406 19/17/14 cleanliness or better to prevent the 1DR30 spool from sticking or the 1CE300 damping orifice from clogging.