GS2 Series Proportional Valve GS2-2-G24 GS2-3-G24

The industrial-grade GS2, GZ3, G3, G4, GZ4, and GR2 Series Screw-in Proportional Electro-Hydraulic Cartridge Valves (featuring standard high-frequency global B2B procurement codes GS2-2-G24, GS2-3-G24, GS2-1-G24, and GR2-2-G24), engineered by Chengyuan Hydraulic, are high-precision, space-saving fluid control components designed for modern Hydraulic Integrated Circuits (HIC), mobile equipment, injection molding pilot systems, and digital micro-fluid automation blocks. Combining a heavy-duty proportional wet-pin solenoid with a micro-machined metering spool, this range seamlessly converts variable electrical current inputs into highly accurate, continuous, and linear fluid velocity (flow) or pressure regulation.

Engineered to match the precise cavity configurations (standard cartridge valve cavities), thread pitches (UNF or Metric), flow gain curves, and coil terminations found in premium global brands (such as HydraForce, Sun Hydraulics, and Bosch Rexroth), Chengyuan’s proportional cartridge line offers 100% direct drop-in interchangeability. Maintenance engineers and hydraulic manifold builders can swap old or worn units directly into existing valve blocks without re-machining custom manifolds or modifying electrical control outputs, minimizing service labor and procurement costs.

Because cartridge proportional valves are closely clustered within dense manifolds, they regularly endure severe high-pressure pulsations and continuous flow shearing. Any internal spool friction or thermal breakdown in the coil can cause erratic motion or drift in the actuators. To ensure reliable performance under these conditions, 100% of Chengyuan’s produced GS2/GZ3 valves undergo 100% rigorous dynamic simulation test bench validation. Each cartridge is analyzed under full-load operational profiles to verify strict adherence to hysteresis thresholds, linearity standards, response times, and coil thermal resilience under a sustained 24V DC input.

Technical Specifications

• Product Series Grouping: GS2, GZ3, G3, G4, GZ4, GR2 Screw-in Proportional Cartridge Valves

• Maximum Permissible Continuous Pressure: Rated from 21.0 MPa to 25.0 MPa (210 – 250 bar / 3625 – 3625 psi)

• Nominal Regulated Flow Rates:

  • Size 1 Configurations (e.g., GS2-1-G24): Nominal capacity within 10 – 15 L/min

  • Size 2 Configurations (e.g., GS2-2-G24 / GR2-2-G24): Nominal capacity within 20 – 25 L/min

  • Size 3 Configurations (e.g., GS2-3-G24): Nominal capacity within 30 – 45 L/min

• Standard Electrical Voltage Drive: G24 Designation (Standard 24V DC; 12V DC G12 configurations available upon request)

• Proportional Solenoid Rated Current Range: Optimized for 750 – 800 mA maximum input current matching standard digital controllers.

• Hysteresis Index: $\le 3.5\%$ (When paired with recommended high-frequency Dither signal generation)

• Linearity Precision Index: $\le 2.0\%$

• Detailed Part Code Structure Analysis:

  • Part Reference: GS2-2-G24

    • GS2: Core product series code for proportional flow control / throttling.

    • 2: Size code indicating a Size 2 industry-standard cavity configuration.

    • G24: Designates the heavy-duty 24V DC proportional electromagnetic coil package.

  • Part Reference: GR2-2-G24

    • GR2: Designates proportional pressure reducing or relieving cartridge valve functionality.

    • 2: Size 2 cartridge hardware footprint matching industrial pilot control manifolds.

    • G24: 24V DC coil configuration optimized for precise electronic pressure adjustment.

Key Technical Advantages

• Micro-Matched Spools with Precision V-Notch Metering: The internal spool and cage elements are machined from premium alloy steel and hardened to $\ge HRC 60$ via deep-freeze vacuum quenching. The metering edges feature precise linear V-notches that ensure smooth fluid modulation with minimal deadband, enabling exceptional low-flow feathering capability.

• High-Insulation Wet-Pin Armature Proportional Solenoid: Utilizing a wet-pin armature design, the core is immersed in system oil for automatic lubrication and dampening. The inductive coils feature Class H high-temperature wire encapsulation to prevent thermal impedance drift at a sustained 800 mA draw, maintaining uniform output characteristics across long operational periods.

• Anti-Cavitation Flow-Cage Geometry: To combat high fluid velocities under steep pressure drops, the internal cage windows are optimized with radiused transitions and CFD-modeled fluid paths. This design significantly suppresses localized cavitation and erosion, protecting structural geometry and maintaining seal integrity over long duty cycles.

• Premium Fluorocarbon (FKM/Viton) O-Ring Matrix: External and internal sealing sections are equipped with high-durometer imported Viton O-rings paired with stiff anti-extrusion backup rings. This sealing matrix withstands continuous high-pressure shearing and thermal aging, preventing cross-port leakage or external weeping within dense manifold blocks.

Application Areas

Thanks to their compact size, high installation density, and rapid electronic response, the GS2 and GZ3 series are widely used in modern electro-hydraulic control architectures:

• Mobile Machinery & Aerial Work Platforms: Proportional steering, smooth platform elevation, and direction-throttling blocks on scissor lifts, telehandlers, compact excavators, and agricultural loaders.

• Custom Hydraulic Integrated Circuits (HIC): Serving as high-response pilot modulation stages for heavy-duty industrial logic valves to achieve remote programmable flow/pressure control.

• Plastics & Die-Casting Automation: Compact pilot blocks on injection molders and automated metal-stamping equipment requiring fine-tuned clamping or pressure-holding adjustment.

Expert Maintenance Tips

• Always Drive the Valve Using a Controller Equipped with Dither Tuning: Proportional solenoids should not be powered with unmodulated, flat DC current. Without a proper dither frequency (recommended between 100 Hz and 150 Hz), static friction (stiction) will cause the spool to stick or jerk, increasing hysteresis and degrading fine-tuning capabilities.

• Adhere Strictly to Manual Torque Limits During Installation: The internal walls of screw-in cartridge sleeves are relatively thin. Exceeding the specified installation torque (Nm) can cause micro-radial deformation of the sleeve. Because internal clearances are measured in microns, even minor overtightening can bind the spool or cause sluggish response.

• Enforce Rigid Fluid Filtration and Use Fine Pre-Cartridge Filtering Elements: Cartridge proportional valves have tiny metering notches that can easily be jammed or scored by micro-particles or varnish. Maintain system oil cleanliness to ISO 4406 19/15/11 or better (absolute filtration rating under 10 microns), and replace elements at scheduled intervals.