Welch ChemStar® Vacuum Pumps / Corrosive Gases Overview
Apply deep vacuum to your system in the toughest conditions.
CHEMSTAR® pumps are built to withstand corrosive chemical vapor
environments - durable performance over the long haul.
CHEMSTAR® is designed to minimize the effects of harmful
Rugged Rotary Vane Design
Built to the renowned performance standards of Welch DUOSEAL®
pumps, CHEMSTAR® utilizes vapor contact components that are
tough and chemical resistant. The belt-drive mechanism gears the
pump down, enabling slow pump operation to reduce friction and
keep operating temperatures low.
The oil capacity is large for excellent dilution of contaminants. Oil
is fed to the pump from the top of the reservoir, allowing sludge
to settle without compromising lubrication. The recommended
lubricant ("Gold Oil") is a synthetic oil designed to reduce chemically
active sites. Use the nitrogen purge to drive elimination of
Welch also provides the system add-ons that further protect your
pump and your environment. Select the equipment that augments
your vacuum system needs - traps, oil mist eliminators, and system
The Five Defining Features Needed For Pumping Corrosive Gases
1. High Contamination Tolerance
- Contaminants diluted
- Fewer moving parts
- Top oil feed for cleaner oil
2. Vital Parts Corrosion Resistant
- Fluoroelastomer seals and gaskets
- Stainless Steel
- Nickel Plated or Anodized
- Chemical Resistant Grade of Cast Iron
3. Reduced Frictional Wear
- Less than 580 RPM vs. typical 1750 RPM direct drive
4. Nitrogen Purge Standard
5. Easy Attachment of Accessories
- Complete accessory package for corrosive gases
For Pumping Corrosive Gases
- SF6, CF4 Fragments and other gases
|Free Air Displacement
cfm (l/min.) @ 60 Hz
m3/hr. (l/min.) @ 50 Hz
|Ult. Vac. Pressure, torr (mbar)1
||1 x 10-4 (0.00013)
|Motor Horsepower (watts)
|Oil Capacity, qt.(liters)
|Tubing Needed, I.D. in.
|ISO Exhaust & Intake Flange2
|Overall Dimensions LxWxH in.(cm)
||19.3 x 14.1 x 15.4|
(49 x 35.3 x 39.1)
|Ship Weight, lbs.(kg)
|Shipping Carton Dimensions LxWxH in.(cm)
||22.5 x 15.5 x 19.5
(57.2 x 39.4 x 49.5)
1CHEMSTAR pump should not be operated continuously at pressures above 10 torr. Ultimate pressure measured with a trapped McCleod gauge.
2Standard filter option possible if the exhaust flange is removed, but not chemically resistant.
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