초록 ▼

A flush plug is provided for temporarily sealing an outlet at an upper end of an irrigation sprinkler riser extensible from an outer housing. A cap is configured to substantially cover the outlet of the riser. The cap has an output orifice dimensioned to reduce the flow of water from the riser a suf

A flush plug is provided for temporarily sealing an outlet at an upper end of an irrigation sprinkler riser extensible from an outer housing. A cap is configured to substantially cover the outlet of the riser. The cap has an output orifice dimensioned to reduce the flow of water from the riser a sufficient amount so that the riser will move to an elevated position under normal operating pressure. The cap is configured so that it can be temporarily connected to the upper end of the sprinkler riser. A shut-off flap is pivotally connected to the cap for covering and uncovering the output orifice. A lever is connected to the shut-off flap and is configured and located to engage an upper end of the sprinkler housing when the riser moves to a retracted lowered position. This positively moves the shut-off flap so that it covers the output orifice in the cap. When the riser moves to the elevated position the lever is no longer engaged with the upper end of the sprinkler housing. The shut-off flap is moved by water pressure so that it uncovers the output orifice in the cap to allow flushing of debris from the sprinkler.

대표청구항 ▼

[ I claim:] [1.]1. A flush plug for temporarily sealing an outlet at an upper end of a sprinkler riser extensible from an outer housing, comprising:a cap configured to substantially cover the outlet of the riser and having an output orifice dimensioned to reduce the flow of water from the riser a su

[ I claim:] [1.]1. A flush plug for temporarily sealing an outlet at an upper end of a sprinkler riser extensible from an outer housing, comprising:a cap configured to substantially cover the outlet of the riser and having an output orifice dimensioned to reduce the flow of water from the riser a sufficient amount so that the riser will move to an elevated position under normal operating pressure;means for temporarily connecting the cap to the upper end of the riser;a shut-off flap integrally molded with the cap and pivotally connected to the cap by a living hinge for covering and uncovering the output orifice; anda lever connected to the shut-off flap, the lever being configured and located to engage an upper end of the sprinkler housing when the riser moves to a retracted lowered position in order to positively move the shut-off flap to cover the output orifice in the cap,whereby the shut-off flap is moved by water pressure to uncover the output orifice in the cap to flush debris from the sprinkler when the riser moves to the elevated position and the lever is no longer engaged with the upper end of the sprinkler housing.