Pressure Compensator Cartridge Valve PC200-7 PC200-6

Pressure Compensator Cartridge Valve PC200-7 PC200-6

4 month ago

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

 4 year year

Product details

1. Definition & Function

TheSwing Cartridge Valveis a core hydraulic component in the excavator's swing system, classified as a2-way cartridge valve. Its primary functions include:

• Controlling swing start/stop: Switching hydraulic flow via solenoid valves to activate, halt, or brake the swing motor.

• Adjusting swing speed: Regulating flow or pressure compensation for smooth rotation.

• System protection: Integrating overload relief and makeup oil functions to prevent motor damage from pressure shocks or oil starvation.

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2. Structural Components

The PC200-6 swing cartridge valve typically consists of:

【表格】

Component Function

Cartridge Body Houses main oil passages; installed in the main valve block to withstand system pressure.

Control Cover Contains solenoid ports and pilot control channels for valve spool actuation.

Spool Axially moves to control port connections, enabling motor rotation/braking.

Spring Assembly Provides spool return force, ensuring neutral position (closed/drain) when unpowered.

Seals Prevent hydraulic leaks (common materials: NBR or FKM rubber).

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3. Operating Principle

• Swing Activation:

When the joystick signals rotation, the solenoid energizes, pilot pressure shifts the spool to connect the main oil path to the swing motor inlet, driving rotation.

• Swing Braking:

Joystick neutral position de-energizes the solenoid; spring resets the spool, cutting main flow and activating braking oil paths for smooth stopping.

• Makeup Oil Function:

During braking, the valve supplies oil to the motor’s low-pressure side via check valves, preventing cavitation.

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4. Common Failures & Diagnostics

【表格】

Symptom Potential Causes Solutions

Weak/slow swing Stuck spool, broken spring, clogged pilot line. Clean spool, replace spring, inspect pilot circuit.

Swing judder/impact Worn spool orifice, failed makeup check valve. Replace spool/check valve, adjust pressure settings.

Braking failure Leaking brake line, spool reset issue. Inspect seals, repair valve block passages.

Hydraulic oil leak Aged O-rings, damaged control cover seal. Replace seals, reinstall and tighten.

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5. Maintenance Recommendations

• Routine Inspection: Check valve sealing every 500 hours; clean control cover filters.

• Oil Cleanliness: Maintain ISO 4406 cleanliness level ≤19/16 (NAS 9 equivalent) to prevent spool sticking.

• Pressure Calibration: Verify pilot control pressure (3.5–4.5 MPa) every 2000 hours using a pressure gauge.

• Component Replacement: Replace spools, springs, and seals every 4000 hours.

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6. Typical Applications

• Komatsu PC200-6 Excavators: Integrated into the main control valve block, collaborating with swing motors and brakes.

• Repair/Retrofit: Direct cartridge replacement (matching bore size and pressure rating) for damaged valve blocks.

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7. Technical Specifications (Reference)

• Rated Pressure: 35 MPa (system maximum)

• Flow Range: 100–200 L/min (model-dependent)

• Pilot Pressure: 3.5–4.5 MPa

• Media Compatibility: Mineral-based hydraulic oil (viscosity grade 46#)

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For advanced troubleshooting or valve block drawings, provide:

1. Operational conditions during failure (e.g., load, temperature).

2. Hydraulic oil analysis report (water content, particle count).

3. Valve block part number or batch code (for spare part matching).

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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4 year

Address: Ningbo, China

Main Product: hydraulic motor, gear box, hydraulic pump , hydraulic valve , hydraulic winch, hydraulic system

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