Landscape · L-W73BE

Mainline Isolation Valve and Drain Valve Details

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An irrigation mainline isolation valve assembly features a steel non-rising stem gate valve with threaded end connections, connected to Schedule 80 PVC piping using threaded nipples, female adaptors, and unions sized to match the mainline. The valve is housed within a ten-inch round valve box extending up to finish grade, with precast concrete pavers and three-quarter-inch washed gravel placed within the box and under the blocks. A separate mainline drain valve assembly consists of a water supply line connected via a galvanized street ell to a Schedule 80 PVC fitting with a threaded outlet, placed over a gravel sump measuring twelve by twelve by twelve inches and wrapped in filter fabric, with a notched Schedule 40 PVC pipe extending up to a ten-inch round valve box. Green valve boxes and lids are installed in lawn areas, while tan boxes and lids are used in planting beds. A two-inch Class 200 PVC sleeve is installed over brass isolation valves located at a depth of eighteen inches or deeper.

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