Komatsu 800/1200 Relief Valve

4 week ago

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

3 year

Product details

1. Model Definition and Classification

1.1 Model Identification

• Possible Interpretations:

• Excavator Model Association: If "800/1200" refers to Komatsu excavator series (e.g., PC800, PC1200), the relief valve is a hydraulic component for these models.

• Pressure Rating Indication: If indicating pressure ranges (e.g., 800 bar/1200 psi), confirm with product specifications.

• Internal Code: Komatsu may use "800/1200" as a series code for relief valves (e.g., KMSV-800/KMSV-1200).

Recommendation:

• Prioritize official Komatsu part numbers (e.g.,705-12-31420for PC800 valves).

• If unavailable, use:"Komatsu Compatible Relief Valve for PC800/PC1200".

1.2 Valve Types

Based on hydraulic system functions, possible types include:

• Main Relief Valve: Limits maximum system pressure to protect hydraulic pumps from overloading.

• Pilot-Operated Relief Valve: Uses a pilot oil circuit for faster response and precise control.

• Proportional Relief Valve: Supports electronic pressure adjustment for advanced applications.

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2. Core Functions and Technical Specifications

2.1 Functional Description

• Pressure Protection: Opens when system pressure exceeds the preset value, diverting excess hydraulic oil back to the tank to prevent pipeline or component failure.

• Pressure Stabilization: Maintains stable pressure during load variations, ensuring normal operation of actuators (e.g., hydraulic cylinders, motors).

• Remote Pressure Adjustment(select models): Enables pressure regulation via external pilot circuits.

2.2 Key Specifications (Example)

【表格】

Parameter Description

Model Komatsu 705-12-31420 (Example)

Applicable Models PC800-8, PC1200-8 Excavators

Rated Pressure 35 MPa (350 bar) / 5,000 psi

Flow Range 100–300 L/min (Adjustable per model)

Adjustment Method Manual knob (Range: 20–35 MPa) or electronic proportional control

Port Connections Inlet: M30×2 thread; Outlet: G1/2 thread

Material Valve body: Cast steel; Seals: Nitrile butadiene rubber (NBR)

Operating Temp. -20°C to +80°C

Certifications ISO 9001, CE

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3. Applications and Troubleshooting

3.1 Typical Applications

• Excavator Hydraulic Systems: Installed at the main pump outlet for circuit protection.

• Hydraulic Breaker Circuits: Limits impact pressure to prevent hammer damage.

• Crane Luffing Systems: Controls luffing cylinder pressure to avoid overloading.

3.2 Common Failures and Solutions

【表格】

Symptom Probable Cause Solution

Insufficient Pressure Low relief valve setting or stuck spool Readjust pressure; clean spool and replace seals

Pressure Fluctuation Fatigued spring or contaminated pilot line Replace spring; clean pilot valve and filter

Frequent Valve Opening Overload or worn spool Check load limits; replace spool assembly

Oil Leakage Aged O-rings or cracked valve body Replace seals; repair or replace valve body

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Ningbo Hengnuo Hydraulic Drive Co.,Ltd

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