1. Product Definition
APressure Compensator Cartridge Valveis an integrated hydraulic valve that maintains stable system flow despite load variations through its built-in pressure compensation mechanism.
• Model Compatibility: PC200-7 and PC200-6 are hydraulic system components for Komatsu excavators and other construction machinery, typically used in main pumps or control valve blocks.
• Structural Features: Cartridge-type design allows direct insertion into valve blocks, saving space and reducing leakage points.
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2. Core Functions
(1) Pressure Compensation
• Dynamic Balancing: Automatically adjusts the valve orifice area when system load pressure changes, ensuring consistent flow through the valve.
Example: During excavator boom lifting, hydraulic cylinder speed remains stable even with varying load weights.
• Differential Pressure Control: Maintains a constant pressure drop (ΔP) across the valve to prevent flow abnormalities due to pressure fluctuations.
(2) Flow Control
• When paired with throttle or proportional valves, it enables precise flow regulation for actuators (e.g., hydraulic motors, cylinders) requiring speed control.
(3) System Protection
• Prevents component damage caused by sudden pressure changes (e.g., shock loads), extending hydraulic system lifespan.
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3. Application Scenarios (Typical Uses for PC200-7 / PC200-6)
(1) Construction Machinery
• Komatsu Excavators: Main pump outlets of PC200-7 and PC200-6 models often incorporate pressure compensator valves to optimize flow distribution during multi-action operations.
• Cranes/Loaders: Used in hydraulic circuits for luffing and slewing motions to ensure stable flow.
(2) Industrial Hydraulic Systems
• Injection Molding Machines: Regulates pressure-flow matching during mold clamping and injection.
• Die-Casting Machines: Controls switching between rapid mold closing and slow injection speeds.
(3) Agricultural Machinery
• Combine Harvesters: Adjusts hydraulic-driven header lifting speeds.
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4. Technical Specifications (Example)
【表格】
Parameter PC200-7 PC200-6
Rated Pressure 35 MPa (350 bar) 32 MPa (320 bar)
Flow Range 50–200 L/min 40–180 L/min
Compensation ΔP 1.5–3 MPa (adjustable) 1–2.5 MPa (fixed)
Response Time ≤20 ms ≤25 ms
Installation Type Slip-in Screw-in
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5. Working Principle
1. Pressure Sensing: The valve spool detects system pressure changes via springs and pressure chambers.
2. Dynamic Adjustment: When load pressure increases, the spool moves to reduce the orifice area, maintaining constant ΔP. When load pressure decreases, the spool enlarges the orifice.
3. Flow Stabilization: By keeping ΔP constant, flow remains independent of load (Q ∝ √ΔP).
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6. Industry Alternatives
• 2/2 Cartridge Valves: Simpler structure but require external pressure compensators.
• Proportional Valves: Enable electronic flow control but at higher costs.
7. Selection and Maintenance Recommendations
(1) Selection Criteria
• Pressure Matching: Ensure rated pressure exceeds system maximum working pressure.
• Flow Requirements: Select valve size based on actuator flow needs.
• Compensation Precision: Choose adjustable ΔP types for high-precision applications (e.g., CNC machines).
(2) Common Failures
• Flow Instability: Check for spool sticking or contamination in compensation springs.
• Leakage: Replace O-rings or spool seals.
• Excessive Noise: Clean valve filters and inspect oil cleanliness.
(3) Maintenance Schedule
• Regular Inspection: Check valve sealing every 500 operating hours.
• Oil Replacement: Follow equipment manuals for hydraulic oil and filter changes.
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8. Example Application Diagram
[System Pump] → [Pressure Compensator Valve] → [Actuator (Cylinder/Motor)] ↑ [Load Pressure Feedback]
