Roots DVJ WHISPAIR Dry Exhausters have an exclusive WHISPAIR discharge jet plenum design which allows cool, atmospheric air to flow into the cylinder. This unique design permits continuous operation at vacuum levels to blank-off with a single stage unit, without water injection.
Product Line Information
Standard dry exhausters are limited to approx. 16” Hg vacuum because operation at higher vacuum levels can cause extreme discharge temperatures resulting in casing and impeller distortion and possible seizure. The DVJ’s cooling design eliminates the problems caused by high discharge temperatures at vacuum levels beyond 16” Hg.
DVJ WHISPAIR exhausters are heavy-duty units withforged steel stub shafts bolted to ductile iron impellers. The casing, headplates, gear cover and drive end covers are grey iron.
Carburized and ground alloy steel spur timing gears are mounted on the shafts of 1000 frame size units by a splash taper fit, while large sizes use a double taper ring locking assembly. Double-row spherical roller bearings are lubricated at both the gear end and drive end. Piston ring shaft seals and lip-type seals are used to restrict oil leakage into the air stream. The DVJ can be equipped with mechanical seals for gas applications.
Roots DVJ WHISPAIR exhausters can be arranged to operate in two and three stage systems to achieve vacuum levels down to 1 torr.
Warranty: Twelve months of operation or eighteen months from date of original purchase.
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