Importance

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Abstract

A backflow prevention apparatus of light weight, modular construction which provides quick and easy access to internal check valves. The backflow prevention apparatus generally comprises a tubular valve body having a lateral opening, at least one check valve positioned within the flow stream of the tubular valve body, a movable sleeve which fits over the valve body and is configured to cover the lateral opening in the valve body, and seals, associated with the sleeve valve body, for providing a fluid tight seal between the sleeve and valve body. The tubular valve body has openings at first and second ends, and the lateral opening is flangeless. Preferably, the backflow preventer includes a first, upstream check valve and a second, downstream check valve each having thereon a stop or ridge thereon. The upstream check valve fits within the lateral opening and is positioned adjacent an upstream edge thereof, with the stop on the upstream check valve fitting against or abutting the upstream edge of the lateral opening. The downstream check valve fits within the lateral opening and is positioned adjacent the downstream edge thereof, with the stop on the downstream check valve fitting against or abutting the downstream edge of the lateral opening. The sleeve is structured and configured to fit over the tubular valve body, and is slidably movable with respect to the valve body such that the sleeve can move between a first position in which the sleeve covers the lateral opening, and a second position in which the sleeve is moved away from the lateral opening and the lateral opening is exposed.

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First Claim