DCG Series Mechanical Operated Directional Control Valves

Overview

The DCG Series is a cam/roller-operated mechanical directional control valve designed for automated hydraulic sequencing in industrial machinery. Available in NG6 (6mm/CETOP 3) and NG10 (10mm/CETOP 5) port sizes, this valve provides reliable, position-triggered hydraulic control without electrical actuation, making it ideal for cyclic automation, machine tool sequencing, and mechanical interlock applications.

Key Features

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Primary Functions

1. Automated Sequence Control — Triggered by mechanical cams or machine components to initiate hydraulic functions at precise positions

2. Cycle Automation — Eliminates electrical switches in repetitive cyclic machinery for enhanced reliability

3. Safety Interlocking — Provides positive mechanical confirmation of machine position before allowing hydraulic operations

4. Position-Sensitive Control — Activates hydraulic circuits only when machine elements reach predetermined positions

Detailed Application Scenarios

1. Machine Tool Automation

• Function: Controls hydraulic clamping, indexing, and feed mechanisms in:

  • Automatic lathes and screw machines

  • Rotary transfer machines

  • Grinding machines (surface, cylindrical, centerless)

  • Broaching and honing machines

• Operation: Cam profiles on machine spindles or slides actuate DCG valves to sequence:

  • Workpiece clamping before cutting

  • Coolant flow activation

  • Tool advance and retract cycles

  • Part ejection at cycle completion

• Advantage: Eliminates electrical limit switches in coolant environments; mechanical reliability ensures consistent cycle timing

2. Plastic Processing Machinery

• Applications:

  • Blow Molding Machines: Parison programming and mold sequence control

  • Extrusion Lines: Die head adjustment and calibration control

  • Thermoforming: Sheet clamping and plug assist sequencing

• Benefit: Cam-operated valves provide repeatable timing independent of PLC scan cycles; immune to electromagnetic interference from heaters and drives

3. Metal Forming & Fabrication Equipment

• Function: Sequence control in:

  • Press Brakes: Bend angle programming via cam-actuated back gauge positioning

  • Tube Benders: Mandrel advance, clamp, and pressure die sequencing

  • Roll Forming: Cutoff and punching operations synchronized with material feed

  • Stamping Presses: Feed progression and part transfer timing

• Precision: Mechanical cam profile ensures microsecond-repeatable timing for high-speed operations (up to 600 strokes/minute)

4. Material Handling & Packaging Systems

• Applications:

  • Conveyor Systems: Diverter gate and sorting mechanism control

  • Palletizers: Layer forming and load transfer sequencing

  • Case Packers: Product grouping and case handling

  • Indexing Tables: Rotary positioning and workstation activation

• Integration: DCG valves mounted on moving machine elements receive direct mechanical input from stationary cams or other machine components

5. Textile & Printing Machinery

• Function: Synchronized control in:

  • Printing Presses: Ink roller engagement and paper feed timing

  • Textile Looms: Shuttle control and pattern selection

  • Dyeing Machines: Fabric handling and chemical injection sequencing

• Reliability: Mechanical operation unaffected by fiber dust, humidity, or chemical vapors that degrade electrical components

6. Agricultural & Forestry Equipment

• Applications:

  • Harvesters: Header height control and reel timing

  • Balers: Twine wrapping and ejection sequencing

  • Forestry Machines: Log grapple and saw sequencing

• Durability: Robust roller mechanism withstands shock loads from field debris and rough terrain

7. Special Purpose Machinery

• Function: Custom automation in:

  • Assembly Machines: Part feeding and fastening sequence control

  • Test Equipment: Automated test fixture clamping and actuation

  • Food Processing: Sanitary hydraulic control without electrical components in washdown areas

  • Explosive Environments: Intrinsically safe operation in ATEX zones where electrical sparks are prohibited

Technical Advantages

• Positive Mechanical Actuation: Roller positively engages cam profile—no signal drift, contact bounce, or electrical noise issues

• Adjustable Roller Position: Lever angle and roller position can be adjusted to fine-tune actuation point relative to machine cycle

• High Overtravel Capacity: Roller mechanism tolerates significant cam overtravel without damage—ideal for high-speed applications

• Spring Return Reliability: Heavy-duty return spring ensures positive valve return even with rapid cam disengagement

• Compact Integration: Valve body mounts directly on machine frame or hydraulic manifold; roller extends to engage machine-mounted cams

Installation & Maintenance Notes

• Cam Design: Cam profile should provide smooth roller engagement (minimum 30° approach angle) to prevent impact damage; maximum cam speed typically 2 m/s roller surface speed

• Roller Alignment: Critical to maintain parallel alignment between roller axis and cam surface to prevent uneven wear and premature failure

• Lubrication: Roller bearing requires periodic greasing in high-cycle applications (>100 cycles/hour)

• Environmental Protection: Install protective covers in chip-generating or washdown environments to prevent debris interference with roller mechanism

• Force Requirements: Standard roller actuation force 15-30N; heavy-duty springs available for high-pressure valve configurations

Conclusion

The DCG Series mechanical directional control valve represents the optimal solution for position-triggered hydraulic control in automated industrial machinery. By eliminating electrical components from the actuation chain, the DCG series delivers unmatched reliability in harsh environments while providing precise, repeatable sequencing synchronized directly to machine mechanical motion. Whether controlling high-speed packaging lines, precision machine tools, or rugged mobile equipment, the DCG-02 and DCG-03 offer the mechanical simplicity and robust performance that automation engineers demand for critical cyclic applications.