Hydraulic Variable Vane Pump
1. Product Overview
The hydraulic variable vane pump is a positive-displacement hydraulic power component widely used in open-circuit industrial hydraulic systems. Different from fixed displacement pumps, it can automatically adjust displacement and output flow by changing the eccentricity between rotor and stator ring.
Equipped with built-in pressure compensator, the pump realizes low-pressure large flow and high-pressure small flow operation, effectively reducing overflow loss, lowering power consumption and oil temperature.
Common series include VP, VVP, VCM, SVPF, PV7 etc. Single pump, double tandem pump types are available. High-quality interchange aftermarket pumps can replace original pumps for machinery maintenance and supporting assembly.
2. Main Technical Parameters
Item Specification
Product Name Hydraulic Variable Displacement Vane Pump
Structure Type Single pump / Tandem double pump
Common Max Working Pressure 7 MPa ~ 16 MPa (low & medium pressure)
Rotation Direction Clockwise / Counter-clockwise (shaft end view)
Applicable Hydraulic Oil ISO VG32 / VG46 anti-wear hydraulic oil
Operating Temperature -10℃ ~ +75℃
Standard Seal Material NBR; FKM high-temperature seal optional
Control Mode Pressure compensator automatic variable
3. Working Principle
Driven by the motor, the rotor rotates, vanes stretch out under centrifugal force to closely contact the inner surface of stator ring.
1. Oil suction: The sealed volume between vanes gradually expands, absorbing hydraulic oil from suction port.
2. Oil discharge: The sealed volume shrinks continuously, squeezing pressurized oil out from outlet port.
3. Variable adjustment: When system pressure reaches set value, built-in compensator pushes the movable stator ring to reduce eccentricity between rotor and stator. Pump displacement decreases automatically to cut unnecessary flow output, maintaining system constant pressure.
4. Core Advantages
1. Automatic flow adjustment according to load demand, obvious energy-saving effect, less heat generation compared with fixed vane pump.
2. Low operation noise, small flow pulsation, stable hydraulic system running.
3. Compact structure, small installation dimension, easy direct connection with hydraulic motor.
4. Simple internal structure, convenient maintenance and low failure rate.
5. Multiple specifications and tandem combination options to meet different circuit requirements.
6. Interchangeable installation dimensions for mainstream series, plug-and-play replacement.
5. Application Range
Widely used in medium & low pressure industrial machinery:
Injection molding auxiliary equipment, shoe-making machinery, machine tools, rubber machinery, packaging machinery, hydraulic press, logistics lifting equipment, automation production lines.
6. Common Faults & Replacement Suggestion
Typical failures: System pressure cannot rise, unstable pressure, abnormal noise, excessive oil temperature, shaft seal leakage.
Keep hydraulic oil clean to avoid impurities scratching vanes and stator inner surface. Adjust pressure according to equipment requirements, do not exceed rated working pressure. Replace complete pump assembly if internal stator, vanes suffer serious wear.
