VP-20 Vane Pump | VP-20-FA2 VP-20-FA1 VP-20-FA3 | Variable Displacement Pump

The VP-20 Series variable displacement vane pumps from Chengyuan Hydraulic are high-efficiency power components designed for low-to-medium pressure systems, fully compatible with Yuken specifications. This series integrates a pressure compensator mechanism that automatically reduces flow when the preset pressure is reached, significantly lowering energy consumption and oil temperature rise. For core models like VP-20-FA2 and VP-20-FA3, we utilize high-strength alloy steel rotors. Every pump undergoes 100% simulated full-load condition testing before delivery to ensure precise response at the pressure cut-off point, guaranteeing 100% original-place interchangeability.

Technical Specifications :

• Series Model: VP-20 Series (Variable Displacement)

• Nominal Displacement: 20 cm³/rev

• Pressure Adjustment Range (FA1): 0.8 – 1.4 MPa (8 – 14 bar)

• Pressure Adjustment Range (FA2): 1.5 – 3.5 MPa (15 – 35 bar)

• Pressure Adjustment Range (FA3): 3.6 – 7.0 MPa (36 – 70 bar)

• Max Rated Speed: 1800 rpm

• Min Rated Speed: 800 rpm

• Mounting Type: Flange Mount (F)

• Shaft Options: Standard Straight Keyed Shaft

• Inlet/Outlet Ports: RC 1/2 or RC 3/4 (standard options)

Key Technical Advantages:

• Precision Pressure Compensation: The VP-20 features a built-in spring compensator. When system pressure hits the preset limit, the cam ring automatically shifts to a near-zero eccentricity position. This “flow on demand” characteristic reduces power consumption by over 60% during pressure holding compared to fixed pumps.

• Superior Low-Noise Performance: By optimizing the vane slot angles and cam ring suction profiles, the VP-20 operates smoothly across its pressure range. Reduced flow pulsations result in noise levels significantly lower than traditional gear pumps, making it ideal for indoor automated lines.

• High-Performance Alloy Components: The internal cam ring surface undergoes high-hardness nitriding, and vanes are made from specialized tungsten-bearing high-speed steel. This prevents scoring during high-frequency sliding, maintaining volumetric efficiency above 90% over the long term.

• Compact Integrated Design: The pump body is cast from specialized iron and precision-machined to ensure tight clearances between the rotor and side plates. This compact design saves installation space while offering excellent shock resistance and thermal dissipation.

Application Areas:

• Machine Tool Industry: Clamping mechanisms for CNC lathes and reciprocating drives for grinders.

• Light Industrial Machinery: Shoe-making machines, cutting machines, and auxiliary circuits for small injection molders.

• Automation Units: Low-energy power sources for various small-scale Hydraulic Power Units (HPU).

Expert Maintenance Tips:

• Pressure Adjustment Protocol: To adjust pressure, loosen the lock nut and slowly turn the adjustment bolt clockwise. Do not exceed the maximum rated pressure for your specific model (e.g., FA2), as this may cause vane failure due to centrifugal imbalance.

• Fluid Cleanliness Standards: Vane pumps are highly sensitive to particle contaminants. The system must include return filtration better than 20μm, maintaining fluid cleanliness to ISO 4406 19/16.

• Drain Line Installation: Variable vane pumps must have a dedicated drain line connected directly back to the tank below the oil level. Do not merge this with the main return line to prevent excessive case pressure from damaging the shaft seal.