K3VL80 Hengli Negative Control Regulators
Hengli HVSE E18 Boom Valve Plates
1. Product Overview
TheHengli HVSE18 Bucket Valve Plateis a highly integrated hydraulic control valve group designed by Hengli Hydraulics specifically for excavator bucket systems. It is primarily used to control the tilting, retracting, and holding actions of the bucket, ensuring precise hydraulic oil circuit distribution. This valve plate enhances the response speed and stability of bucket operations while incorporating overload protection and energy-saving features.
Model Breakdown:
• HVSE: Hengli Hydraulics’ variable pump/motor valve series code (Hengli Variable System Equipment).
• 18: Indicates valve port size or pump displacement rating (unit: cc/rev; refer to product manual for specifics).
2. Structure and Functions
(1) Core Components
• Main Valve Body: Made of high-strength cast iron or aluminum alloy, featuring integrated multi-channel hydraulic circuits with precision-ground inner walls to minimize leakage.
• Solenoid Directional Valve: Controls the extension/retraction of bucket cylinders, supporting proportional or on/off control modes.
• Relief Valve: Sets system maximum pressure to prevent overload damage (typical setting: 250–350 bar).
• Throttle Valve/Flow Control Valve: Adjusts bucket tilting speed for varying work conditions.
• Check Valve: Prevents hydraulic oil backflow, ensuring bucket position retention.
• Pressure Compensation Valve(optional): Maintains stable flow during multi-actuator composite operations.
(2) Key Functions
• Bucket Tilting/Retracting Control: Switches oil circuits via solenoid valves for upward tilting, downward retracting, and positioning.
• Load-Sensing Control(LS): Some models integrate LS functionality to automatically adjust pump output based on load.
• Regeneration Function: Optimizes oil circuits during bucket descent to reduce energy loss (e.g., regenerative valves recover gravitational potential energy).
• Safety Protection: Overpressure protection and anti-cavitation design extend hydraulic system lifespan.
3. Technical Specifications
【表格】
Parameter Typical Value
Operating Pressure 210–350 bar (system max)
Flow Range 30–120 L/min (pump-dependent)
Working Medium Mineral-based hydraulic oil (ISO VG46)
Operating Temperature -20°C to +80°C
Filtration Requirement ISO 4406 18/16 (NAS 6 grade)
Weight 6–12 kg (material/config-dependent)
4. Applications
• Excavator Bucket Systems: Controls digging and dumping actions, matching engine power to bucket force.
• Loader Work Devices: Optimizes bucket lifting and tilting smoothness.
• Compact Construction Equipment: E.g., skid steer loader bucket control.
5. Installation and Commissioning
(1) Installation Guide
• Port Alignment: Ensure valve plate port markings (P: inlet, A/B: bucket cylinder control, T: return) match hydraulic system piping.
• Seal Inspection: Replace O-rings or composite seals to prevent high-pressure leakage.
• Mounting: Secure with bolts; refer to manual for torque values (typically 50–80 N·m).
(2) Commissioning Steps
1. Pressure Setting:
• Adjust relief valve spring to set system maximum pressure (e.g., 320 bar).
• Test pressure switch signals to ensure overpressure alarm functionality.
2. Flow Calibration:
• Adjust throttle valves to match bucket tilting/retracting speed with operator handle signals.
• Verify actual flow vs. setpoint deviation using a flow meter (≤±5%).
3. Functional Testing:
• No-load test: Check for smooth bucket motion without crawling or shock.
• Load test: Validate overload protection and record pressure fluctuation ranges.
6. Common Faults and Solutions
【表格】
Symptom Possible Cause Solution
Bucket won’t tilt Solenoid coil断路 (open circuit)/valve spool jamming Replace coil or clean spool
Rapid bucket descent Excessive throttle opening/check valve leakage Adjust throttle or replace check valve
Insufficient pressure Low relief valve setting/pump failure Reset relief valve or inspect pump
Valve body overheating Severe internal leakage/high oil viscosity Replace seals or use proper viscosity oil
Abnormal noise Air ingestion/valve spool vibration Bleed air/optimize spool design
7. Maintenance and Upkeep
• Regular Inspections:
• Check valve body sealing every 500 hours; replace aged O-rings.
• Clean valve block internal passages every 2000 hours to prevent debris buildup.
• Oil Management:
• Use hydraulic oil meeting ISO 4406 18/16 cleanliness; monitor contamination levels.
• Avoid excessive oil temperatures (≤70°C recommended) to prevent seal degradation.
• Spare Parts Stocking:
• Keep common wear parts (e.g., solenoid valves, relief valve spools, seals) in stock.
