Sany 365/485 Distributor Valve KMX32NA
3 week ago
Product details
1. Product Overview
TheSany 365/485 Distributor Valve (Model: KMX32NA)is a hydraulic main control valve designed by Sany Heavy Industry for365-ton/485-ton excavators(or similar heavy-duty equipment). It belongs to the category of multi-way directional control valves and serves as the core component fordistributing hydraulic oil flow, controlling the sequence, speed, and direction of actuators (e.g., boom, arm, swing motor).
Model Interpretation:
• KMX32NA:
• KMX: Sany valve series code (possibly indicating "Key Multi-Way" or a specific design).
• 32: Valve port size (DN32, corresponding to a nominal flow rate of ~160-200 L/min).
• NA: Version or configuration identifier (e.g., electrical interface type, seal material).
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2. Core Functions & Technical Specifications
(1) Primary Functions
• Directional Control: Switches hydraulic oil flow via spool valves to start/stop and reverse actuators.
• Flow Regulation: Adjusts spool opening to control actuator speed (requires proportional valves or load-sensing systems).
• Pressure Protection: Integrates relief valves to prevent system overpressure (typical setting: 35-40 MPa).
• Logical Control: Supports sequential operations (e.g., swing before boom lowering) to avoid hydraulic shock.
(2) Key Parameters
【表格】
Parameter Value Range Description
Nominal Port Size DN32 (1.25 inches) Suitable for high-flow systems
Rated Pressure 35 MPa (350 bar) Continuous working pressure
Peak Pressure 40 MPa (400 bar) Short-term allowable pressure
Flow Range 160-250 L/min Depends on pump displacement and spool opening
Spool Type Spool Valve Excellent sealing and fast response
Control Method Manual/Hydraulic Pilot/Electro-Hydraulic Proportional Adapts to automation needs
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3. Structure & Components
(1) Valve Body Composition
• Main Valve Body: High-strength cast iron (e.g., HT250) or aluminum alloy (lightweight design), integrating multi-passage oil channels.
• Directional Spools: Steel-plated chrome spools paired with wear-resistant seals (e.g., PTFE).
• Pilot Control Valve: For remote operation (hydraulic pilot or solenoid-driven).
• Relief Valve Group: Prevents overload and protects the hydraulic system.
• Port Interfaces: Compliant with SAE or DIN standards (e.g., SAE J518 flange connections).
(2) Typical Configuration (KMX32NA Example)
• Number of Spools: 6-8 (corresponding to boom, arm, swing, travel, etc.).
• Neutral Position: O-type (closed center, oil path blocked when neutral) or H-type (open center, unloading).
• Electrical Interface: Optional CAN bus or analog signals (0-10V/4-20mA) for intelligent control.
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4. Application Scenarios
(1) Primary Equipment Compatibility
• Sany 365/485 Series Excavators:
• 365-ton class: Suitable for large-scale mining and earthmoving.
• 485-ton class: Ultra-large mining operations (e.g., iron ore, coal mines).
• Other Heavy-Duty Equipment:
• Rotary drilling rigs, cranes, concrete pumps requiring coordinated multi-actuator hydraulic systems.
(2) Typical Operating Conditions
• Compound Movements: Simultaneous operation of boom lift + swing + arm digging, requiring precise flow distribution.
• High-Load Operations: Withstands high-pressure shocks in hard strata or heavy-duty conditions.
• Automated Control: Electro-hydraulic proportional valves enable fine-tuning (e.g., precision excavation).
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5. Maintenance & Troubleshooting
(1) Routine Inspections
• Oil Cleanliness: Regularly test (NAS 1638 ≤ Class 8) to prevent spool sticking.
• Seal Condition: Check O-rings and composite seals for aging or leakage.
• Pressure Testing: Verify relief valve settings with a pressure gauge.
(2) Common Faults
【表格】
Symptom Possible Causes Solutions
Slow Operation Worn spools, contaminated oil, low pump flow Clean valve, replace seals, inspect pump
Leakage Damaged seals, valve body cracks, loose connections Replace seals, weld valve body, tighten bolts
Low Pressure Stuck relief valve, low pump pressure, small spool opening Adjust relief valve, inspect pump, modify spool
Excessive Noise Air ingestion, spool vibration, abnormal oil viscosity Bleed air, replace spools, adjust oil temperature
(3) Maintenance Precautions
• Disassembly Sequence: Record spool positions to avoid reverse assembly.
• Cleaning Requirements: Use hydraulic oil for cleaning; avoid cotton swabs (lint residue).
• Replacement Cycle: Replace seals every 5,000 hours; conduct full overhaul every 10,000 hours.
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