The VHS-400 diffusion pump has a pumping speed of up to 4500 L/s. All VHS series pumps have sight glass/fill and drain assemblies for continuous monitoring and easy maintenance of pump fluid. The patented Bulge Contour increases gas capture and maintains lower pressure. Finned boilers increase surface area, prolonging pumping fluid life.

This Vapor Jet Pump is great for high vacuum applications. This pump is a perfect fit for industrial applications such as vacuum furnace, heat treatment, metallizing, and coating processes for architectural glass and the automotive industry.

Patented Bulge Contour increases gas capture
Fluid-level sight glass provides quick indication of pump fluid status at all times
Fill and drain assembly for easy maintenance of pump fluid
Four-stage fractionating jet purifies pumping fluid
High tolerable forepressure
Full thermal protection safeguards against all thermal overloads
Finned boiler increases surface area, prolonging pumping fluid life
Quick cool coil is standard
Foreline baffle prevents fluid loss into backing system
Stainless steel body

Part Number Variant

K4816307 VHS-400 diffusion pump, ASA, with standard cold cap, 208 V, 4400 W
K4816308 VHS-400 diffusion pump, ASA, with standard cold cap, 240 V, 4400 W
K4816309 VHS-400 diffusion pump, ASA, with standard cold cap, 480 V, 4400 W
K4816326 VHS-400 diffusion pump, ASA, with standard cold cap, 380 V, 4400 W
L9767307 VHS-400 diffusion pump, ISO 400K, with standard cold cap, 208 V, 4400 W
L9767308 VHS-400 diffusion pump, ISO 400K, with standard cold cap, 240 V, 4400 W
L9767309 VHS-400 diffusion pump, ISO 400K, with standard cold cap, 480 V, 4400 W
L9767326 VHS-400 diffusion pump, ISO 400K, with standard cold cap, 380 V, 4400 W
MSPD11030 VHS-400 diffusion pump, ISO 400K, with standard cold cap, 400 V, 4400 W

New, factory warranted pumps available.

Price: POA, please contact us for latest prices

Manual

View Manual

Backstreaming Rate

1 x 10-³ mg/cm²/min

Cooldown Time

25 min

Electrical Requirements

3 ph

50/60 Hz

208/240/380/480 V

Fluid Charge

1000 CC

Fluid Type

Oil

Input Voltage

208, 240, 380, 480 V

Maximum Forepressure - Full Load

0.55 Torr

0.72 mbar

Maximum Forepressure - No Load

0.65 Torr

0.85 mbar

Maximum Throughput

6.3 T-L/s (8.4 mbar-L/s)

Operating Range

1.4 x 10-³ to <5 x 10-⁹ Torr

1.9 x 10-³ to <6.5 x 10-⁹ mbar

Pump Power

4400 W

Pump Weight

180 lbs

81 kg

Pumping Speed - Air

4500 L/s

Pumping Speed - Air, via AVS 4.1 (1963)

8000 L/s

Pumping Speed - He/H2

5625 L/s

Recommended Backing Pump

≥ 30 cfm (51 m³/hr)

Warmup Time

15 min

Water Connections

1/8 inch FPT

Water Cooling - Temperature Requirement

60-80 °F

15-26 °C

Water Cooling Flow Requirement

0.4 gpm

80 L/hr

Service Information

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VHS-400 Diffusion Pump

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VHS-400 Diffusion Pump