VHS-400 Oil Diffusion Pump

Importance of the Topic

Oil diffusion pumps are essential for achieving high vacuum levels in various industrial and research applications. The VHS-400 model provides robust performance, enabling processes such as vacuum metallurgy, thin-film coating, and advanced material fabrication. Its design addresses contamination control, maintenance needs, and process efficiency.

Objectives and Study Overview

This datasheet aims to present the performance characteristics, technical specifications, and operational guidelines for the VHS-400 oil diffusion pump. The overview covers pumping speed, capacity, operational limits, and recommended support equipment for optimal integration into vacuum systems.

Methodology

Performance metrics were obtained using DC704 diffusion pump fluid under controlled conditions. Key parameters measured include pumping speed across a range of inlet pressures, maximum throughput, backstreaming rates, and warmup/cooldown behavior.

Instrumentation

• Stainless steel body and flanges for durability and ease of cleaning
• Patented Bulge Contour to enhance gas capture and maintain low pressure
• Finned boilers to increase heat transfer area and extend fluid life
• Sight glass with fill and drain assembly for fluid monitoring and maintenance
• Compatible flanges: DN 400 ISO-K or ASA, foreline DN 63 ISO-K or 2 in ASA
• Electrical requirements: 3 phase, 50/60 Hz, 208/380/480 VAC, 4 400 W power consumption
• Recommended backing pump: ≥30 cfm rotary vane unit
• Cooling water supply: 0.50 gpm at 15–26 °C

Main Results and Discussion

• Pumping speed: 4 500 L/s for air; 5 625 L/s for helium and hydrogen
• Operating range: from 1.4×10⁻³ to below 5×10⁻⁹ Torr
• Maximum throughput: 6.3 Torr·L/s in normal range, rising to 7.5 Torr·L/s at 0.01 Torr
• Backstreaming rate: less than 1.0×10⁻³ mg/cm²/min with standard cold cap
• Warmup and cooldown times: 15 and 25 minutes, respectively

Performance curves indicate stable pumping speed across a wide pressure range, confirming reliability for high- and ultra-high-vacuum applications.

Benefits and Practical Applications

The VHS-400 pump offers high throughput and low contamination risks, making it suitable for:

• Vacuum heat treatment and furnace operations
• Metallizing and coating processes in the glass and automotive industries
• Research laboratories requiring stable high vacuum

Future Trends and Applications

• Integration with digital monitoring for real-time performance feedback
• Development of eco-friendly pump fluids to reduce environmental impact
• Miniaturized diffusion pumps for compact vacuum systems
• Advanced materials for improved thermal and corrosion resistance

Conclusion

The VHS-400 oil diffusion pump delivers high-speed, reliable vacuum performance with design features that simplify maintenance and extend service life. Its versatility and robust specifications make it a valuable component for both industrial and research vacuum systems.

References

Agilent Technologies. VHS-400 Oil Diffusion Pump Data Sheet. 2024.