VCM Series Variable Displacement Vane Pump | VCM-SF-30A/B/C/D VCM-SF-40A/B/C/D-20 | VCM-DF-20C-20C-10 High Pressure Pump

Chengyuan Hydraulic presents the VCM Series Variable Displacement Vane Pumps, precision-engineered to meet the high-efficiency and energy-saving requirements of modern industrial hydraulic systems. This series includes the single-stage VCM-SF-30/40 models (available in A/B/C/D pressure ranks) and the VCM-DF double pump series. The core value of the VCM series lies in its sophisticated pressure-compensation mechanism, which automatically reduces displacement when the system reaches the preset pressure, significantly lowering heat generation and power consumption. Chengyuan guarantees 100% Drop-in Interchangeability with major global brands regarding mounting dimensions and hydraulic characteristics. Each unit is subjected to 100% simulation load testing to ensure peak volumetric efficiency across the entire speed range.

Technical Specifications 

• Product Series: VCM Variable Displacement Vane Pump

• Specific Models: VCM-SF-30A/B/C/D, VCM-SF-40A/B/C/D, VCM-DF-20C-20C-10

• Displacement: 30: 30ml/r; 40: 40ml/r; 20C-20C: Double 20+20ml/r

• Pressure Adjustment Range:

  • Rank A: 8 – 20 Bar

  • Rank B: 15 – 35 Bar

  • Rank C: 30 – 55 Bar

  • Rank D: 50 – 70 Bar

• Rated Speed: 1800 r/min

• Speed Range: 800 – 1800 r/min

• Rotation: Right-hand (Clockwise)

• Control Type: Pressure Compensated

• Housing Material: High-strength precision cast iron with superior damping properties

Key Technical Advantages:

• Efficient Pressure Compensation Logic: The VCM series utilizes a precision-tuned internal spring to adjust the cam ring position. As system pressure approaches the setpoint, the pump instantaneously reduces output to a minimum flow required for pressure holding. This effectively mitigates the overheating issues found in fixed displacement systems, reducing temperature rise by over 40%.

• Ultra-Low Noise Operation: Featuring a specialized acoustic-treated pump housing and an optimized stator curve design. Even under full load at high pressure, the noise level is maintained between 60-65 dB(A), making it ideal for indoor hydraulic units with strict noise regulations.

• High-Precision Distribution Structure: The valve plates are treated with anti-wear coatings and paired with precision-ground vanes. This design not only minimizes internal leakage and boosts volumetric efficiency but also enhances seizure resistance when using low-viscosity hydraulic fluids.

• Modular Double Pump Design (VCM-DF): The double pump configuration allows two pump heads to be driven by a single motor, enabling flexible combinations of high-pressure/low-flow and low-pressure/high-flow outputs. This minimizes installation footprint and simplifies piping layout.

Application Areas:

• Precision Machine Tools: Provides stable pressure for hydraulic chucks, tool turrets, and cooling systems.

• Shoe-making & Light Industry Machinery: Widely used in cutting machines and embossing presses requiring frequent pressure transitions.

• Auxiliary Injection Equipment: Controls the smooth movement of auxiliary actuators.

• Automated Clamping Systems: Perfect for applications requiring long durations of pressure holding with minimal energy consumption.

Expert Maintenance Tips:

• Inlet Pressure Monitoring: Vane pumps are extremely sensitive to air ingestion. Ensure the inlet filter is clean; suction vacuum must not exceed -0.3 bar to prevent cavitation damage to the stator.

• Initial Startup Venting: Before starting the pump for the first time, air must be bled through the outlet port or air bleed valve. It is recommended to jog the motor 3-5 times under no-load conditions until fluid flow stabilizes.

• Pressure Adjustment Protocol: Adjust the pressure by gradually turning the adjustment bolt. Clockwise increases pressure, while counter-clockwise decreases it. Never force adjustment beyond the specific rank’s maximum limit (A/B/C/D) while the system is at high pressure.