Hydraulic Proportional Valve
3 month ago
Product details
Rexroth hydraulic valve
A hydraulic valve is an automation component operated by pressure oil. It is controlled by a pressure distribution valve and pressure oil. It is usually used in combination with an electromagnetic pressure distribution valve. It can be used to remotely control the on and off of the oil, gas, and water pipeline systems of hydropower stations. Commonly used for clamping, control,lubrication and other oil circuits.There are direct-acting type and pilot type, and the pilot type is mostly used.
FEATURES AT A GLANCE
Hydraulic valve design principle
The design of the hydraulic valve is mainly for the design of the hydraulic valve group, and the oil circuit must be considered before the design of the hydraulic valve group. It is necessary to determine in advance which parts of the oil circuit can be integrated. The design of the oil circuit must be simple and save Go unnecessary steps. After determining the oil circuit, the main thing is the oblique hole and the process hole. These things in the oil path should be reduced. As long as it is enough, it is not necessary too much. Pay attention to the hole diameter in the design of the oblique hole and the process hole.
Hydraulic Proportional Valve: Technical Overview
I. Core Definition
AHydraulic Proportional Valveis an electro-hydraulic control component that continuously regulates hydraulic system pressure, flow rate, or direction through electrical signals (voltage/current). Its output parameters (e.g., pressure, flow) maintain alinear proportional relationshipwith the input electrical signal, enabling high-precision dynamic control.
II. Working Principle
1. Electro-Mechanical Conversion
The proportional solenoid receives control signals (e.g., 0-10V DC or 4-20mA current) and generates proportional thrust.
2. Mechanical-Hydraulic Conversion
Thrust moves the spool, altering valve port opening to adjust hydraulic oil flow/pressure.
3. Closed-Loop Feedback (Optional)
Advanced models integrate displacement/pressure sensors for closed-loop control, enhancing accuracy and disturbance rejection.
Typical Control Curve:
Input Signal (%) → Spool Displacement (mm) → Flow/Pressure (L/min or MPa) exhibits linearity, with slope determined by valve ratings.
III. Main Types
【表格】
Type Function Typical Applications
Proportional Pressure Valve Continuous pressure regulation Die-casting machines, injection molding pressure holding
Proportional Flow Valve Continuous flow rate adjustment CNC machine tool hydraulic feeds
Proportional Directional Control Valve Simultaneous direction/flow control Excavator booms, crane luffing mechanisms
Proportional Reducing Valve Stable low-pressure output Clamping fixtures, servo actuators
IV. Key Performance Parameters
1. Nominal Flow Rate (Qn)
Maximum allowable flow under rated pressure (e.g., 25L/min, 100L/min).
2. Pressure Range (Pmax)
Maximum operable pressure (e.g., 35MPa, 70MPa).
3. Hysteresis
Maximum output deviation during signal increment/decrement (typically ≤3% FS).
4. Linearity
Deviation between actual and theoretical linear output (typically ≤±1% FS).
5. Response Frequency (f)
Spool stroke time from neutral to full open (typical: 10-100ms).
6. Temperature Drift
Output accuracy variation with oil temperature (compensation range specified).
V. Technical Advantages
1. Continuous Control
Stepless speed/pressure adjustment reduces mechanical shock vs. on-off valves.
2. Energy Efficiency
Flow-on-demand regulation cuts overflow losses (≥30% energy savings vs. throttle valves).
3. Integration
Direct PLC/CNC connectivity enables automated control.
4. Contamination Resistance
Pilot-operated design tolerates higher contamination levels than servo valves (NAS 6-8).
VI. Typical Applications
1. Construction Machinery
• Excavator boom speed control (proportional directional valves)
• Crane luffing smooth operation (proportional flow valves)
2. Plastics Machinery
• Injection molding shot speed/pressure staging (proportional pressure+flow valves)
3. Metal Processing
• Die-casting machine clamping force control (proportional pressure valves)
• Bending machine ram speed regulation (proportional flow valves)
4. Aerospace
• Aircraft landing gear deployment (proportional directional valves with redundancy)
5. Renewable Energy
• Wind turbine pitch hydraulic systems (proportional valves with shock resistance)
VII. Selection Criteria
1. Flow Matching
Valve nominal flow ≥1.2× system maximum demand.
2. Pressure Compatibility
System peak pressure ≤90% of valve rated pressure.
3. Signal Compatibility
Verify controller output (voltage/current) matches valve interface.
4. Environmental Adaptability
• Industrial: -20°C to +80°C operating range
• Military: -40°C to +125°C (special seals required)
5. Protection Rating
Outdoor use requires IP65+ (dust/water resistance).
VIII. Leading Brands & Models
【表格】
Brand Representative Series Key Features
Rexroth 4WRPEH, 4WRPEJ 200Hz high response, integrated electronics
Parker D1FP, D3FP Explosion-proof options, CAN bus support
Moog D633, D634 Nanometer precision, aerospace materials
Atos DHZO, DLHZO Low power consumption, IO-Link communication
IX. Maintenance & Troubleshooting
1. Common Faults
• Output fluctuation: Check power stability, signal interference
• Sluggish response: Clean spool, replace filter (NAS≤6)
• Leakage: Inspect seals, valve body cracks
2. Preventive Maintenance
• Filter replacement every 500 operating hours
• Annual performance testing (hysteresis, linearity)
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Ningbo Hengnuo Hydraulic Drive Co.,Ltd
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