초록 ▼

A pop-up rotor type irrigation sprinkler has a pivotable butterfly valve body located in its riser just below the nozzle. The valve body is selectively pivotable between fully open and fully closed positions by manually turning a drive member mounted in the upper end of the riser with a hand tool. T

A pop-up rotor type irrigation sprinkler has a pivotable butterfly valve body located in its riser just below the nozzle. The valve body is selectively pivotable between fully open and fully closed positions by manually turning a drive member mounted in the upper end of the riser with a hand tool. The drive member is connected to the valve body with a linkage that extends within the riser outside of the water flow path to avoid adversely affecting the water stream ejected from the nozzle. The valve body has an elliptical shape and is curved in section and downwardly concave when in its closed position. Due to its curved shape, the valve body can pivot to its vertical open position in which it rests parallel with the curved cylindrical interior wall of an internal flow tube to minimize flow resistance. Due to its elliptical shape, the valve body can pivot to its substantially horizontal position in which its peripheral edges are snug up against the cylindrical interior wall of an internal flow tube in order to achieve a substantial seal. Tolerance problems that would otherwise be associated with a circular butterfly valve are avoided. The downwardly concave shape of the valve body when in its closed position and its over-the-center pivotal mounting result in the water pressure acting to hold the valve body in its filly closed position until manually pivoted to its open position.

대표청구항 ▼

[ What is claimed is:] [1.]1. A method of shutting off the flow of water through an irrigation sprinkler having a vertically reciprocable inner housing with a water flow path extending therethrough and a nozzle mounted in an upper end of the inner housing providing an extension of the water flow pat

[ What is claimed is:] [1.]1. A method of shutting off the flow of water through an irrigation sprinkler having a vertically reciprocable inner housing with a water flow path extending therethrough and a nozzle mounted in an upper end of the inner housing providing an extension of the water flow path for distributing a stream of water outward from the inner housing, the inner housing being vertically reciprocable within an outer body, comprising the steps of:inserting a tool into an exterior of an upper end of the inner housing to engage a drive member mounted in the inner housing; andmanually moving the tool a sufficient amount so that movement of the drive member that is conveyed to a valve body positioned in the water flow path will pivot the valve body from a first position in which the water flow path is substantially unobstructed to a second position in which the valve body substantially closes off the water flow path.