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DESIGN & OPERATING PRINCIPLE The Beach-Russ Type RP Pump design features simplicity and high performance efficiency. The pump has a minimum of moving parts : The Rotor and its slide valve, which are always completely oil-sealed in the pump cylinder. The rotor is set eccentrically in the cylinder with the elliptical cylinder bore made to such close tolerances that the end of the slide valve in the rotor maintains uniform minimum clearance from the cylinder wall through its rotation. Thus as the rotor turns, the slide valve acts as a piston, forcing all the air or gas is drawn out of the cylinder through the discharge valves. Simultaneously, a constant vacuum is created behind the slide valve piston as new air or gas is drawn in through the manifold heads and intake ports in the hollow slide valve. The air space on the discharge side of the pump is steadily reduced, forcing the air through the exhaust port into the double spring loaded disc valves. These valves, submerged in oil, make it possible for the pump to discharge against atmospheric pressure for a small part of a revolution and prevent back leakage of air into the pump. The air and oil mixture then passes into the baffled air-oil separator where the oil drops into the reservoir to be re-used, while the air is exhausted into atmosphere or piping. This unique combination of the mechanical inlet slide valve and automatic double exhaust valve, together with rotary pump design and rocker oil seals on the slide valve, account for the un-usually high vacuum and volumetric efficiency in this single stage pump.
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