Envirovac, Inc.

William P Mulligan

George T Beatty

Theodore C Powers

Mark A Pondelick

Morris J Brunell

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.

Vaccum toilet system

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.

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Belvidere, IL, United States of America

William P Mulligan