Patent ID: 6374431
Filing Date: 2002-04-23
Classification: E03F,Y10T

Abstract:
A vacuum toilet system comprising:at least one vacuum toilet; a combination sewage holding and vacuum tank operatively connected to said vacuum toilet, said tank having a top and a bottom; a pump capable of pumping air and sewage; an air conduit connected to said tank adjacent said top thereof at a first end, and having a second end; a sewage conduit having a bottom end positioned adjacent said tank bottom, and a top end connected to said pump; said air conduit second end operatively connected to said sewage conduit between said top and bottom ends thereof; a valve connected to said air conduit between said air conduit first end and said sewage conduit, said valve having: a first position in which atmospheric air can pass through said valve into said tank through said air conduit first end, but not directly to said pump; and a second position in which air from said tank passes through said air conduit first end directly to said pump and atmospheric air is substantially precluded from entering said air conduit; a vacuum switch for sensing vacuum level in said tank and controlling said pump in response thereto when said valve is in said second position; and a second switch for operating said pump when said valve is in said first position for pumping sewage out of said tank.