AWWA C515-09 pdf download.Reduced-Wall, Resilient-Seated Gate Valves for Water Supply Service
4.4.1.3 resistant surface. Te surface may be either metallic or nonmetallic, applied in a manner to withstand the action of the line fuids and the operation of the sealing gate during long-term service. A metallic surface shall have a corrosion resistance equivalent to or better than bronze. A nonmetallic surface shall be in compliance with ANSI/AWWA C550. Valve ends. Except as agreed on by the purchaser and supplier,
4.4.1.4 end connections shall conform to one of the following requirements. The thickness of the end fanges may be less than specifed in 4.4.1.4.1 ASME B16.1 or ANSI/AWWA C110/A21.10 but not less than shown in Table 4. Other dimensions and drilling of end fanges shall conform to ASME B16.1 class 125 or ANSI/AWWA C110/A21.10 except as modifed by the purchase doc- uments. Unless spot-facing is required by the purchase documents, the bolt holes of the end fanges shall not be spot-faced except when the thickness at any point within the spot-face area, as defned in MSS SP-9, exceeds the required minimum fange thickness of ASME B16.1 by more than indicated in Table 3 or if the fange is not suffciently fat. If the foregoing limit is exceeded, either spot-facing or back- facing may be used to meet the requirements. When required, spot-facing shall be done in accordance with MSS SP-9. Bolt holes shall straddle the vertical centerline of the valve, unless otherwise specifed by the purchaser. The laying lengths of fanged valves 12 in. (300 mm) and smaller shall conform to the requirements for double disc gate valves listed in Table 1 of ASME B16.10.
The connecting fange of the tapping valve mating with the tapping machine must be parallel and concentric with the opposite fange and concentric with the waterway to provide proper alignment for the tapping operation. Te end fange of a tapping valve that forms a joint with the tapping machine shall conform to the dimensions of MSS SP-113.AWWA C515-09 pdf download.