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. Vapour boosters from Edwards have been proven in the field for over 30 years. With a constant program of updates and modernisation, 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.

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