Abstract: A vacuum toilet system for a vehicle (such as a boat) has numerous advantages. A single pump with valves on opposite sides of it may be used as both the vacuum source and for discharging sewage from a holding tank. Two sets of multiple heads may be selectively connected to two pumps for emergency purposes. The vacuum toilet includes a sealing element with an integral movable valve engaging element including polytetrylflouroethylene and synthetic rubber, and at the same durometer (55-65). The initial passageway provided by movement of the valve with respect to the seal is disposed directly above the center line of an orifice. An an anti-siphon valve assembly has a simple construction of a housing with parallel legs and anti-siphon air passage in alignment with one of the legs. A spray nozzle extends from the other legs of the anti-siphon valve assembly. The toilet funnel/orifice is universally connected to conduits.

Abstract: A vacuum toilet system for a vehicle (such as a boat) has numerous advantages. A single pump with valves on opposite sides of it may be used as both the vacuum source and for discharging sewage from a holding tank. Two sets of multiple heads may be selectively connected to two pumps for emergency purposes. The vacuum toilet includes a sealing element with an integral movable valve engaging element including polytetrylflouroethylene and synthetic rubber, and at the same durometer (55-65). The initial passageway provided by movement of the valve with respect to the seal is disposed directly above the center line of an orifice. An anti-siphon valve assembly has a simple construction of a housing with parallel legs and anti-siphon air passage in alignment with one of the legs. A spray nozzle extends from the other legs of the anti-siphon valve assembly. The toilet funnel/orifice is universally connected to conduits.

Abstract: A flush valve assembly (10) for a water closet having a reservoir tank (12) with a discharge opening (15). The flush valve assembly (10) incorporates a spud (13) having a tubular body portion (14) which presents an annular groove (55) that extends peripherally of the body portion (14) in close proximity to its axially upper rim (88). The tubular body portion (14) is received in the discharge opening (15) of the tank (12). The radial groove (55) supports a cantilevered diaphragm (51) which extends radially outwardly therefrom. The spud (13) also includes a guide (35) having a vent tube (40) slidably received thereon. The guide (35) extends axially upwardly from the body portion (14) of the spud (13) to be positioned interiorly of the tank (12). The lower portion of the vent tube (40) presents a skirt (45) which extends outwardly and downwardly to define a circular valve seat (49) for selective, sealing engagement with the diaphragm (51).