High-pressure relief valve for A4VG hydraulic pump
2 week ago
Product details
1. Core Functions
• Pressure Protection: When the output pressure of the A4VG hydraulic pump exceeds the set value, the high-pressure relief valve automatically opens, diverting excess hydraulic fluid back to the tank to prevent system overpressure damage (e.g., pipeline rupture, seal failure, or actuator overload).
• System Stability: Maintains hydraulic system pressure within a safe range, ensuring stable operation of components such as pumps, motors, and valves at rated pressure.
• Pressure Regulation: Some models allow precise pressure adjustment (e.g., 10–35 MPa adjustable) via spring preload adjustment or proportional solenoid control.
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2. Structural Components
• Valve Body: Typically made of high-strength steel or cast iron to withstand high-pressure impacts.
• Valve Spool: Conical or spherical design, paired with a valve seat for sealing, enabling rapid response under high pressure.
• Spring: Provides preload force, determining the valve’s cracking pressure.
• Adjustment Mechanism: Manual knob or proportional solenoid valve for pressure setting.
• Seals: High-pressure-resistant rubber or polytetrafluoroethylene (PTFE) materials to prevent leakage.
• Additional Features: Some models integrate pressure sensors or remote control interfaces for intelligent monitoring.
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3. Technical Specifications (Example)
【表格】
Parameter Typical Value
Rated Pressure 25 MPa (adjustable range: 10–35 MPa)
Flow Range 50–200 L/min (matches pump displacement)
Response Time ≤10 ms (rapid opening under pressure surge)
Operating Temperature -20°C to +80°C (high/low-temp options available)
Port Size G1/2" or M22×1.5 (adapted to pump model)
Material Valve body: 45# steel; Valve spool: hard alloy
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4. Application Scenarios
• Construction Machinery: Hydraulic systems in excavators, loaders, and road rollers to protect main pumps and actuators (e.g., hydraulic cylinders, motors).
• Industrial Equipment: Hydraulic circuits in injection molding machines, die-casting machines, and forging presses to prevent mold damage or equipment failure.
• Agricultural Machinery: Hydraulic lift systems in combine harvesters and tractors to avoid overload-induced mechanical damage.
• Marine & Offshore Engineering: Hydraulic systems for steering gears, windlasses, and deck machinery, adapting to harsh marine conditions.
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5. Selection & Installation Guidelines
• Pump Model Matching: Select a relief valve based on the A4VG pump’s displacement (e.g., A4VG28, A4VG56, A4VG125).
• Pressure Setting: Set the valve pressure 10%–20% higher than the system’s rated working pressure.
• Installation Position: Mount on the pump outlet or high-pressure side of the main circuit, close to the pump to minimize pressure loss.
• Maintenance Interval: Regularly inspect seals for wear, spring fatigue, and spool sticking. Replace O-rings or composite seals every 500 operating hours or annually.
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6. Common Faults & Troubleshooting
• Leakage: Check for aged or damaged seals; replace O-rings or composite seals.
• Pressure Instability: Clean the valve spool and seat to remove contaminants; adjust spring preload.
• Failure to Open: Inspect for broken springs or stuck adjustment mechanisms; replace the valve body if necessary.
• Excessive Noise: Check hydraulic fluid viscosity or air entrapment; replace fluid and bleed the system.
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7. Industry Standards & Certifications
• International Standards: Compliant with ISO 4408 (hydraulic valve performance testing) and ISO 10770-1 (electro-hydraulic proportional valve standards).
• Safety Certifications: CE, UL, or CCS (China Classification Society) approval for export or special applications.
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