VCM-SF VCM-DF CML Variable Displacement Vane Pump 70 Bar

Product Overview

The VCM-SF (single flange) / VCM-DF (double flange) series are pressure-compensated variable displacement vane pumps manufactured to original Taiwan CML (Camel Precision) specifications. Designed for medium and low pressure industrial hydraulic systems, they offer full on-site interchangeability with genuine CML pumps. Featuring a spring-loaded pressure compensation mechanism, the pump automatically adjusts stator eccentricity based on system load to deliver stepless flow control, reducing energy consumption during no-load conditions. The high-strength grey cast iron housing ensures smooth, quiet operation with high volumetric efficiency. Every unit undergoes 100% full working condition simulation testing before delivery, with performance fully compliant with original factory standards, making it a cost-effective alternative to genuine CML vane pumps.

Technical Specifications

• Brand: CML (Camel Precision, Taiwan, China)
• Product family: VCM-SF single flange variable vane pump, VCM-DF double flange variable vane pump
• Available models:
  • Single pumps: VCM-SF-12C-10, VCM-SF-30A-20, VCM-SF-30B-20, VCM-SF-30C-20, VCM-SF-30D-20, VCM-SF-40A-20, VCM-SF-40B-20, VCM-SF-40C-20, VCM-SF-40D-20
  • Double pump: VCM-DF-20C-20C-10
• Rated flow (at 1800 rpm, no load):
  • Frame 12: 12 L/min
  • Frame 20: 20 L/min
  • Frame 30: 30 L/min
  • Frame 40: 40 L/min
• Pressure adjustment ranges (corresponding to suffix A/B/C/D):
  • Grade A (AS/A): 5–10 bar / 10–20 bar
  • Grade B: 15–35 bar
  • Grade C: 30–55 bar
  • Grade D: 50–70 bar
• Maximum operating pressure: 70 bar (Grade D)
• Operating speed range: 800 – 1800 rpm
• Volumetric efficiency (rated condition): ≥ 90%
• Housing material: high-strength grey cast iron
• Seal material: NBR (compatible with mineral anti-wear hydraulic fluids)
• Mounting: standard flange mounting
• Drive shaft: standard keyed shaft / 9-tooth splined shaft optional
• Port thread: PT, BSPP, NPT optional
• Weight:
  • SF-12 series: approx. 5.0 kg
  • SF-20 series: approx. 5.5 kg
  • SF-30/40 series: approx. 9.5 kg
  • DF-20 double series: approx. 11 kg

Key Technical Advantages

1. Pressure-compensated stepless displacement control: The integrated spring-return pressure compensation valve automatically reduces stator eccentricity when system pressure reaches the set point, enabling continuous flow adjustment from 0 to full rated flow. This eliminates overflow losses, delivering over 25% energy savings and reducing fluid temperature rise to extend oil and seal service life.
2. Low-noise vibration-optimized design: The stator ring adopts a high-precision conjugate curve profile with rounded vane tips, paired with a floating valve plate structure to effectively reduce flow pulsation and hydraulic shock. Operating noise is below 62 dB(A) with minimal vibration, making it ideal for precision machine tools and automation equipment with strict noise requirements.
3. High-wear matched friction pairs: The rotor, vanes and valve plate are made of wear-resistant alloy cast iron, precision-lapped and group-run-in with micron-level fit clearances. The hydraulically balanced vane design ensures tight contact under high pressure, minimizing internal leakage and maintaining stable volumetric efficiency above 90% with excellent pressure-holding performance.
4. Standardized on-site interchangeability: Mounting flange dimensions and port positions fully comply with original CML standards, allowing direct replacement of genuine CML pumps without modifying equipment mounting bases or connecting pipelines. This enables quick replacement, significantly reducing equipment downtime and production loss.
5. 100% full-condition factory validation: Every pump undergoes full-performance bench testing under rated pressure, maximum pressure and rated speed, with core indicators including volumetric efficiency, internal leakage, noise level and temperature rise verified item by item. All test data is traceable to ensure performance fully matches original CML specifications.

Application Areas

• CNC lathes, machining centers, grinding machines and milling machine hydraulic stations
• Shoe-making machinery, vulcanizing machines and small injection molding machines
• Automated production lines, hydraulic fixtures and clamping systems
• Packaging machinery, printing machinery and woodworking machine hydraulic power units
• Small lifting equipment and conveyor hydraulic systems

Expert Maintenance Tips

1. Installation alignment control: Connect the pump shaft to the drive motor with a flexible coupling, and ensure coaxiality tolerance ≤ 0.1 mm. Direct belt or gear drive on the pump shaft is prohibited to avoid bearing and shaft damage from radial loads.
2. Air venting and oil filling before first startup: Before initial startup, fill the pump chamber with clean hydraulic oil through the top filling port, and bleed air from the suction line to prevent dry friction damage to vanes, stator and valve plate surfaces.
3. Fluid and cleanliness requirements: ISO VG32 or VG46 anti-wear hydraulic oil is recommended. Maintain operating temperature between 10°C and 70°C; oil cleanliness shall meet NAS 9 grade or higher. An 80–100 μm suction filter is recommended on the inlet side.
4. Pressure adjustment procedure: When adjusting the pressure compensation valve, turn the adjusting screw slowly to increase pressure gradually to the set value; sudden over-pressurization is prohibited. Factory preset pressure is the mid-value of the pressure grade, and field adjustment must not exceed the rated maximum pressure of the model.
5. Scheduled maintenance interval: Perform routine maintenance every 2000 operating hours to inspect seal aging, pump core wear and mounting bolt torque. Replace hydraulic oil every 6000 operating hours, and clean the oil tank and pipelines simultaneously to prevent contaminants from entering the pump and accelerating wear.