| Rotation of the pump rotor,
which is mounted eccentrically in the pump cylinder, traps
entering vapor between rotor vane segments. As rotation continues,
vapor is compressed and discharged into the exhaust box. Vapors
then pass through several stages of internal oil and mist
eliminators to remove 99.9% of lubricating oil from the exhaust.
Oil is then returned to the oil reservoir. Additional features
include an automotive type spin-on oil filter, and a built-in
inlet anti-suckback valve that prevents the pump from rotating
backwards. A built-in gas ballast is available on the RA version,
which permits pumping with high water vapor loads.
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