VP Series Variable Vane Pump | VP-SF-30 VP-SF-40 VP-30F | Hydraulic Pump

The VP Series variable vane pumps from Chengyuan Hydraulic are high-efficiency power sources fully compatible with Yuken and other major industrial standards. These pumps feature an integrated pressure compensation mechanism, which automatically adjusts the displacement according to load pressure, significantly reducing energy consumption and system heat generation. For core models such as VP-SF-30-B-20 and VP-SF-40-C-20, we utilize high-hardness alloy stators and precision-ground vanes. Every unit undergoes 100% simulated condition testing before shipment to ensure accurate response at flow cutoff points, guaranteeing 100% original-place interchangeability.

Technical Specifications :

• Series Model: VP-SF Series (Single Pump) / VP-F Series

• Displacement Size: 30 (26.7 ml/r) / 40 (33.3 ml/r)

• Pressure Adjustment (A): 8 – 20 bar (0.8 – 2.0 MPa)

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

• Pressure Adjustment (C): 30 – 55 bar (3.0 – 5.5 MPa)

• Pressure Adjustment (D): 50 – 70 bar (5.0 – 7.0 MPa)

• Max Speed: 1800 rpm

• Min Speed: 800 rpm

• Direction of Rotation: Clockwise (from shaft end)

• Weight: Approx. 11.5 kg (VP-30) / 13.5 kg (VP-40)

Key Technical Advantages:

• Excellent Energy Saving: When the system pressure reaches the preset value, the eccentric stator automatically shifts towards the center, reducing displacement to a minimum (compensation state). This consumes very little power to maintain pressure, saving over 30% energy compared to fixed pump systems.

• Ultra-Low Noise Operation: The stator curve uses high-order continuous derivative design combined with specialized damping slider structures to suppress impact vibrations. Under full pressure, noise levels remain between 60-68 dB, ideal for indoor automated workshops.

• Rapid Pressure Compensation Response: Equipped with high-sensitivity springs and eccentricity adjustment mechanisms, the switch from full flow to zero flow occurs in milliseconds, ensuring system pressure remains stable during actuator cycling.

• High-Hardness Wear Components: The stator surface is heat-treated to HRC 60+, and vanes are made of high-speed steel, providing superior wear and galling resistance, ensuring long service life even with slight oil viscosity fluctuations.

Application Areas:

• CNC Machine Tools: Powering chuck clamping and turret auxiliary systems in lathes and grinders.

• Automated Production Lines: Handling cycles requiring high flow at low pressure and low flow at high pressure.

• Specialized Machinery: Providing stable hydraulic power for shoe-making machines and woodworking presses.

Expert Maintenance Tips:

• Air Bleeding: During initial start-up, loosen the pressure adjustment bolt completely (to minimum pressure) and run unloaded for 5 minutes to exhaust air, preventing abnormal vane impact.

• Suction Height: Maintain a suction height within 500mm. Sharp high-pitched whistling usually indicates cavitation; check the inlet pipe seals immediately if this occurs.

• Temperature Control: Maintain oil temperature between 15°C and 60°C. Excessive heat reduces viscosity, which can impair the sensitivity of the variable displacement regulation.