Item Details:
This standard describes iron-body, resilient-seated gate valves with nonrising
stems (NRS) and outside screw-and-yoke (OS&Y) rising stems, including tapping
gate valves, for water supply service having a temperature range of 33º-125ºF
(0.6º- 52ºC). These valves are intended for...
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AWWA C509-09 Resilient-Seated Gate Valves for Water Supply Service
This standard describes iron-body, resilient-seated gate valves with nonrising
stems (NRS) and outside screw-and-yoke (OS&Y) rising stems, including tapping
gate valves, for water supply service having a temperature range of 33º-125ºF
(0.6º- 52ºC). These valves are intended for applications where fluid velocity does
not exceed 16 ft/sec when the valve is in full open position. Major revisions made to the standard in this edition
include the following:
editorial changes to conform to current AWWA form and content;
addition of reduced-thickness ductile-iron flanges;
addition of stainless-steel alloys for use as a stem material;
permitting the use of nonintegral thrust collars for stems in NRS valves;
addition of aluminum-bronze and silicon-bronze copper alloys;
addition of 14-, 18-, and 36-in. valve sizes;
addition of socket head and metric fasteners;
requirement to use an antiseize compound with stainless-steel bolts and
nuts; and,
removal of maximum phosphorus content.