b06520440 - 18B4B, ANSI, 415-440V

18B4B, ANSI, 415-440V

B06520440

Overview

The Edwards 18B4B vapour booster pumps offer higher pumping speeds, of up to 6000 l s-1 at pressures intermediate between mechanical boosters and diffusion pumps. Vapor boosters from Edwards have been proven in the field for over 30 years. With a constant program of updates and modernization, with input from OEM’s and end users, combined with inherent reliability, ease of use and tolerance to various inlet and exhaust pressures they have been used extensively in metallurgy and coating industries as well as other specialist applications.

Technology

Vapour booster pumps operate in a similar way to vapour diffusion pumps but, in addition to having annular jets, they have an ejector stage which greatly boosts the throughput of the pump. The ultimate pressure of these pumps is around 10-4 to 10-5 mbar above which the pumps exhibit considerable pumping speed for permanent gases. High critical backing pressures allow the use of relatively small mechanical backing pumps. The pumps are used in the 10-1 to 10-4 mbar range where rotary pumps are at their limit and ordinary diffusion pumps exhibit instability.

These pumps are most useful in pumping contaminated systems and high loads of hydrogen, hence their use in metallurgical and chemical processes.

Applications

  • Vacuum metallurgy
  • Distillation, drying and degassing
  • Thin film coating and metallizing
  • Large-scale research

Features and Benefits

  • Very large pumping speed at high operating pressures
  • Very high throughput at operating pressures
  • Quick crossover for excellent pump down times
  • Industry proven for over 40 years
  • Excellent reliability
  • Can replace Stokes 16" ring jet booster
  • Boiler port for ease of cleaning

Technical Data

Pumping speed
air 4000 ls-1
hydrogen 6000 ls-1
Maximum throughput 100 mbar ls-1 /

75 Torr ls-1
Critical backing pressure 2-2.6 mbar /
(with AP201 fluid) 1.5-2 Torr
Recommended backing pump displacement 190 m3h-1 /

112 ft3min-1
Recommended backing pump GXS450, E2M275
Recommended fluid Apiezon® AP201
Fluid charge 10 litre / 9.5 qt
Inlet connection 8x11mm holes on 387.4 PCD (Edwards) /

ANSI 12 inch / ISO320
Backing connection 2 inch union (Edwards) /

ANSI 4 inch / ISO160
Water connection -
Heater power 6.0 kW / 8 hp
Warming up time for full performance at
maximum heater input 60 min
Minimum water flow inlet 375 @ 25 ⁰ C/1.6 US gal min-1 @25 ⁰ C
Water block threaded hole ½ inch BSP
Weight 165 kg / 365 lbs

Performance

Dimensions


B.  Position of base securing holes 3 x 7/16 inch (12.7mm) diameter on 21 5/8 inch (549mm) p.c.d.
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