PC35 OIL SUCTION VALVE
2 month ago
Product details
Pc60 SUB RELIEF VALVE (WITHOUT HOLE)
PC35 OIL SUCTION VALVE
1. Product Definition & Function
TheP120-5 Main Relief Valveis a corepressure protection devicein hydraulic systems, designed to limit the maximum working pressure of the system or sub-circuits, preventing damage from overpressure such as pipeline rupture, seal failure, or equipment damage.
Key Functions:
• Overpressure Protection: Automatically opens to relieve pressure when system pressure exceeds the set value, maintaining safe pressure levels.
• Pressure Stabilization: Dynamically adjusts pressure relief to minimize fluctuations.
• Multi-Stage Protection(Optional): Supports staged pressure relief for varying operational needs.
Typical Applications:
• Hydraulic pump outlets (main system circuit pressure control).
• Sub-circuits for critical actuators (e.g., hydraulic cylinders, motors).
• Testing benches, presses, and equipment requiring precise pressure control.
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2. Technical Specifications (P120-5 Example)
【表格】
Parameter P120-5 Main Relief Valve Specifications
Model P120-5
Nominal Diameter DN12 (12mm orifice, customizable)
Pressure Range 1–25 MPa (High-pressure type up to 40 MPa)
Max Flow Rate 120 L/min (High-flow type up to 200 L/min)
Response Time ≤10 ms (Rapid opening to prevent pressure shocks)
Pressure Deviation ±1% FS (Full-scale accuracy)
Temperature Range -20°C to +100°C (High-temp type up to 150°C)
Materials Body: Carbon steel/stainless steel; Seals: FKM
Connection Type Thread (G3/4", G1") or flange
Control Method Direct-acting (spring-loaded) or pilot-operated
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3. Structure & Working Principle
TheP120-5 Main Relief Valvetypically adoptsdirect-actingorpilot-operateddesigns, with core components including:
1. Valve Body: Integrates inlet (P), outlet (A), and tank port (T).
2. Pressure Spring: Sets the valve opening pressure; spring preload determines the pressure range.
3. Main Spool: Conical or slide-type design, controlled by pressure-spring force balance.
4. Pilot Valve(Pilot-operated only): Controls main spool action via small-flow remote adjustment.
5. Seals: High-pressure seals prevent leakage.
Working Process:
1. Normal Operation: System pressure ≤ set pressure → spool remains closed, no relief.
2. Overpressure: System pressure ≥ set pressure → spool overcomes spring force to open, diverting fluid from P to T.
3. Pressure Recovery: System pressure drops below set value → spring pushes spool closed, stopping relief.
Structural Advantages:
• Direct-acting: Simple, fast response, suitable for low-pressure/small-flow systems.
• Pilot-operated: High precision, remote adjustable, ideal for high-pressure/large-flow systems.
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4. Selection Guide
1. Pressure Matching:
• Valve rated pressure ≥ 1.25× system maximum working pressure.
• Pressure range must cover actual system pressure fluctuations.
2. Flow Matching:
• Valve max flow rate ≥ system max relief demand (e.g., pump flow × 1.5 safety factor).
• High-flow systems require pilot-operated valves to reduce pressure loss.
3. Installation:
• Vertical mounting (spool downward) to prevent debris accumulation.
• Ensure tank port (T) returns directly to the reservoir to avoid backpressure affecting accuracy.
4. Fluid Compatibility:
• Confirm hydraulic fluid type (mineral oil, water-based, etc.) matches seal materials.
• High-viscosity oils require larger orifices to reduce flow resistance.
5. Control Method Selection:
• Direct-acting: Low cost, simple systems, but narrow adjustment range.
• Pilot-operated: Remote adjustable, high precision, suitable for complex systems.
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5. Common Faults & Maintenance
Fault Phenomena & Causes:
【表格】
Fault Possible Causes Solutions
Inability to Adjust Broken spring, loose adjustment screw, or pilot valve blockage Replace spring, tighten screw, or clean pilot valve
Severe Leakage Aged seals, valve body cracks, or loose connections Replace seals, repair body, or tighten connections
Pressure Fluctuation Weak spring, contaminated fluid, or stuck spool Replace spring, filter fluid, or clean spool
Slow Response Excessive spring preload, high fluid viscosity Adjust preload or use lower-viscosity fluid
Maintenance Recommendations:
• Inspect spool flexibility every 500 hours; clean debris.
• Regularly replace hydraulic fluid and filters to prevent contamination.
• For long-term storage, set spring to minimum pressure and seal tank port.
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6. Comparison with Similar Products
【表格】
Feature P120-5 Main Relief Valve Traditional Direct-Acting Valve Solenoid Relief Valve
Control Method Spring/pilot-operated Pure mechanical Electric + spring
Pressure Accuracy ±1% FS ±5% FS ±0.5% FS (requires power)
Response Speed ≤10 ms 15–20 ms 5–8 ms (solenoid-dependent)
Cost Medium Low High
Applications General hydraulic systems Simple low-pressure systems Automated systems requiring remote adjustment
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7. Application Cases
• Injection Molding Pressure Control: Protects hydraulic systems from overpressure, extending mold lifespan.
• Construction Machinery Hydraulic Pumps: Acts as a main pump outlet relief valve to prevent pipeline bursts.
• Hydraulic Testing Benches: Enables precise pressure loading via pilot-operated adjustment for safe testing.
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