A larger off-load valve boosts performance on 750 Series pumps from Wallenstein Vacuum Pumps - Elmira Machine Industries. They have 422 cfm airflow at 1,200 rpm and vacuum up to 28 inches Hg. Cooling options include air cooling (fan), liquid cooling (jacketed housing) or dual cooling, where air injection is combined with liquid cooling. Lubrication options include a shaft-driven oil pump or an automatic air pressure system that force lubricates with no moving parts. They have extra thick and wide vanes for longer service life and lower maintenance cost. A standard flush port allows routine internal cleaning. A quick-access endplate allows easy internal inspection with no bearings to pull. 800/801-6663; www.wallenstein.com.
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