Edwards Stokes 412-H replacement oil mist filter pleated for Stokes Model 412H-11 rotary piston vacuum pump.

Filter Dimensions
Lenght: 18"
Height: 11"
Width: 11"

The Stokes Model 412H-11 is a large 300 CFM oil-sealed rotary piston vacuum pump that is the standard for industrial roughing vacuum applications. The Stokes Pennwalt 412H-11 can rough from atmosphere to it’s 2.5x10-2 Torr ultimate pressure and have a 10 horse power motor. The Stokes Microvac pumps are self-contained, oil-sealed rotary piston type units. The piston is driven eccentrically around the pump shaft and guides through two floating hinge bars that are free to oscillate in the pump housing. The exhaust valves are of the corrosion-resistant, heavy duty, poppet type. When the pump is in operation, lubrication of the internal parts is completely automatic. Oil is forced by atmospheric pressure from the reservoir through the oil lines to the shaft bearings. The oil is then fed into the pump to provide the necessary piston-to-cylinder oil seal. Finally, the oil is forced out through the exhaust valve with the air and returns to the reservoir. A solenoid valve automatically prevents oil from flooding the pump in the event of a power failure, or when the pump is shutdown without vacuum being broken. These Stokes 412H-11 oil-sealed rotary piston vacuum pumps require 12 gallons of Edward's Stokes V-Lube grade F vacuum pump oil, have a 4 inch ASA inlet flange, a combination 3 inch ASA / ANSI and 3 inch female NPT exhaust discharge port, are water cooled with 1/2 inch female NPT water cooling connections, and operate on 3-Phase 208-230 VAC or 440-480 VAC at 60 Hz. The pump intake is 4 inch ASA ANSI without o-ring groove, therefore, the intake adapter fitting need to include an o-ring groove.