Multiple recirculating toilet

Claim 1

A fluid recirculating sanitary system for selectively supplying flushing fluid to a plurality of toilets wherein fluid is present in said system under pressure, each of said toilets having a waste outlet, comprising in combination: a single flushing manifold operatively connected to all of said toilets; a single waste holding tank operatively connected to the waste outlets of all of said toilets; a plurality of controllable volume pumping means mounted internally of said tank adapted to respond to the fluid pressure in the system to maintain a predetermined fluid pressure in said system, each of said pumping means having an outlet connected in parallel through said flushing manifold to supply flushing fluid selectively to the toilets, each of said pumping means having an inlet in fluid communication with waste in said tank; pressure sensing means connected to said flushing manifold for providing a first signal when sensed fluid pressure in said manifold is less than a predetermined magnitude; control means, connected to said pumping means and said pressure sensing means, and operable in response to applied first signals for energizing one of said pumping means for supplying flushing fluid to the flushing manifold; by-pass means, located internally of each of said pumping means and in fluid communication with the waste in said tank, each of said by-pass means being independently operable from each other and operable in response to sensed fluid pressure in said flushing manifold for diverting sufficient fluid from each of said pumping means outlet back into said tank to maintain the fluid pressure at the toilets at a desired pressure; and volume and pressure monitoring means operatively connected to both said flushing manifold and said control means for monitoring the volume and pressure of flushing fluid admitted into said toilets.