Abstract: A vacuum toilet system is protected against overflow of a toilet bowl by an overflow protection system that automatically generates an overflow condition signal when the toilet bowl is in a near-full condition and initiates a discharge valve operating cycle, in which the discharge valve of the toilet bowl is opened and closed independently of the flush member associated with the toilet bowl, in response to the overflow condition signal.

Abstract: A sewage collection and disposal system for a passenger transport vehicle comprises a sewage collection tank having a sewage inlet connected to a sewer pipe of the vehicle and a sewage discharge outlet for draining sewage from the sewage collection tank under control of a drain valve. A cleaning liquid supply pipe connects a source of cleaning liquid under pressure to a cleaning liquid supply connection for introducing cleaning liquid into the sewage collection tank. A precharge tank that is in fluid communication with the sewage collection tank is also connected to the cleaning liquid supply pipe, whereby cleaning liquid is supplied to the precharge tank when cleaning liquid is supplied to the cleaning liquid supply member. A blower establishes a partial vacuum in the sewage collection tank when the drain valve is closed, whereby pressure difference between the precharge tank and the sewage collection tank forces cleaning liquid present in the precharge tank into the sewage collection tank.

Abstract: A vacuum toilet system comprises a tank having a sewage inlet connection for entry of sewage into the tank, a level detector establishing a maximum filling level for the tank, and a spray nozzle assembly for distributing cleaning liquid inside the tank. The spray nozzle assembly comprises an axle member having a first end portion provided with a mechanism attaching the axle member to the tank and a second end portion defining a vertical axis of rotation. The axle member is hollow and defines a passage that extends from the first end portion of the axle member and debouches at an outlet at the second end portion thereof. The spray nozzle assembly comprises a spray head mounted on the second end portion of the axle member for rotation about the vertical axis of rotation.

Abstract: A solenoid actuated valve for controlling flow of fluid through a bore defined by a tube comprises an armature fitted slidably in the bore for displacement therein under solenoid control. The armature comprises a generally cylindrical magnetic body that is a clearance fit in the bore, and a glide pad carried by the magnetic body for guiding movement of the magnetic body relative to the tube and preventing direct sliding contact therebetween.