Plumbing · L-G5Y6S

Mainline Isolation Valve and Drain Valve Details

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Two distinct irrigation utility assemblies comprise a mainline drain valve and an isolation valve housed in ten-inch round valve boxes set below finish grade. The drain valve assembly incorporates a water supply line connected to a Schedule 80 PVC fitting with a threaded outlet, a three-quarter-inch galvanized street elbow, a notched two-inch Schedule 40 PVC pipe extending up through the valve box, and filter fabric surrounding a twelve-by-twelve-by-twelve-inch gravel sump filled with three-quarter-inch washed gravel. Precast concrete pavers of standard brick size rest on the gravel base within and beneath the valve box to stabilize the installation. The isolation valve assembly features an inline steel or brass non-rising stem gate valve with threaded end connections, flanked by Schedule 80 PVC female adapters, threaded nipples, and unions sized to match the mainline for easy maintenance access. Schedule 80 PVC fittings and pipe match the mainline size throughout, and green or tan lids are specified for lawn areas versus planting beds respectively.

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