Abstract: A back flow prevention device and/or vacuum breaker device for mounting on a plumbing fixture. The device comprises a body having fluid entry means, fluid exit means and backflow prevention means. The backflow prevention means is located between the fluid entry means and the fluid exit means and the backflow prevention means comprises, a chamber having an entry port contiguous with the fluid entry means, an exit port contiguous with the fluid exit means and a back flow prevention port which is open to atmospheric pressure and a valve movably mounted between a first position sealing the entry port and a second position sealing the backflow prevention port. Fluid flowing into the chamber moves the valve out of the first position into the second position thereby allowing fluid to freely flow through the chamber, out the exit port and along the fluid exit means.

Abstract: A valve assembly comprising three main body parts removably secured together to permit ready assembly and disassembly; one part (11) incorporating a diverter valve in the form of a ceramic cartridge made of a plurality of discs (20, 21, 22); a further part having a vacuum breaker or back-flow preventer (42) comprising a freely movable check valve (45) located in an inlet flow path, for travel between upper and lower valve seats in response to changes in atmospheric pressure and flow direction; and when desired a pop-up drain or waste control rod (15) having no integral guide means associated therewith and operating smoothly and reliably while being inexpensive and simple to manufacture. The assembly may be adapted to receive a decorative escutcheon which permits its use in a wide variety of applications.

Abstract: A transfer-diverter valve assembly is provided including vacuum breaker and back-flow prevention structure. The valve is formed as a single unit for mounting on the deck or flange of a tub, bath or similar fixture and is designed for ready installation as well as ready access to the unit for maintenance or replacement. The valve assembly includes a manually actuated diverter valve for transferring liquid flow from an inlet to one or another of multiple outlets, with a back-flow preventer/vacuum breaker valve located in an inlet flow path and actuatable by changes in fluid flow pressure and direction or atmospheric pressure. In addition, a back-flow preventer valve is located in a first outlet flow path and normally biased to close the inlet flow path, but opens in response to flow from the inlet.