1. Product Overview
TheHVME270-050000 Port Relief Valveis a hydraulic safety device designed to control pressure at specific ports, preventing system damage caused by overpressure. It automatically releases excess hydraulic fluid to the tank or return line when the pressure exceeds a preset threshold, protecting hydraulic components (e.g., pumps, motors, cylinders) from high-pressure shocks.
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2. Core Functions
• Pressure Protection: Opens to relieve excess pressure when the port pressure exceeds the set value, maintaining system stability.
• Leakage and Burst Prevention: Avoids seal damage or pipe rupture due to overpressure.
• Directional Pressure Relief: Controls pressure only at the designated port (e.g., HVME270-050000 interface) without affecting other circuits.
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3. Technical Specifications (Example)
【表格】
Parameter Description
Model HVME270-050000
Rated Pressure 35 MPa (customizable; common range: 20–50 MPa)
Flow Range 50–200 L/min (design-dependent)
Pressure Deviation ±5% (high-precision models: ±2%)
Response Time ≤10 ms (fast-response type)
Port Type Threaded (e.g., G1/2, M18×1.5) or flange (design-dependent)
Temperature Range -20°C to +120°C (high-temp models: up to +150°C)
Materials Valve body: Carbon steel/stainless steel; Seals: NBR/FKM
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4. Applications
• Construction Machinery: Pressure control for hydraulic arms in excavators, loaders, and cranes.
• Industrial Equipment: Mold protection circuits in injection molding and die-casting machines.
• Agricultural Machinery: Hydraulic suspension systems in tractors and combine harvesters.
• Energy Sector: Yaw system pressure limits and hydraulic braking in wind turbines.
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5. Structure and Working Principle
• Components:
• Valve Body: Main pressure channel with inlet (Port) and outlet ports.
• Adjusting Spring: Sets the opening pressure (adjusted via screw).
• Valve Spool: Moves to open the outlet when pressure reaches the set value.
• Seals: Prevents high-pressure oil leakage.
• Working Principle:
1. System pressure enters the valve body through the port.
2. Below the set pressure, the spool remains closed, allowing normal oil flow.
3. Above the set pressure, the spool overcomes spring force, opening the outlet to return excess oil to the tank.
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6. Selection Guide
• Pressure Matching: Choose a valve with a rated pressure 10–20% higher than the system’s maximum working pressure.
• Flow Compatibility: Ensure the valve’s flow range covers system demands to avoid spool sticking.
• Media Compatibility: Select seal materials based on hydraulic fluid type (mineral oil, synthetic oil, water-based fluid).
• Installation Space: Verify valve dimensions (length, diameter) fit equipment layout.
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7. Installation and Commissioning
• Installation Steps:
1. Clean the port and valve interface to prevent contaminants.
2. Tighten threaded connections using a torque wrench (e.g., 50–70 N·m).
3. Ensure unobstructed outlet flow to avoid backpressure.
• Commissioning Tips:
1. Gradually increase pressure to the set value after system startup, observing timely valve opening.
2. Verify opening pressure with a gauge; adjust the spring if necessary.
3. Test pressure stability after relief (fluctuation should be ≤±3%).
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8. Maintenance and Troubleshooting
• Regular Inspections:
• Check seals every 500 hours for aging or leaks.
• Replace hydraulic oil and clean the valve every 2000 hours.
• Common Faults and Solutions:【表格】
Symptom Possible Cause Solution
Valve fails to open Stuck spring, contaminated spool Clean spool, replace spring
Severe leakage Damaged seals, loose connection Replace seals, retighten port
Pressure fluctuation Fatigued spring, contaminated oil Replace spring, filter/replace oil
