Plumbing stop valve and method of use

Abstract

A method for installing plumbing fixtures in a multi-story building having a waste stack includes a stop valve between the waste output of each fixture and the waste stack, the valve allowing the waste water to flow from the fixture toward the waste stack, but preventing flow from the waste stack back into the plumbing fixture. The valve has a cylindrical body, a lower assembly and an upper assembly, which together form a water-tight structure, with threaded outlets in each assembly. Within the body there is suspended a stop ball having a diameter larger than that of the ball seat in the upper outlet. When water attempts to back up from the waste stack in the direction of the stop valve, the ball is forced against the upper seat and blocks the water flow.

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