1、ANSI/AWWA C508a-11Addenda to ANSI/AW WA C508-09 Standard ForSwing-Check Valves for Waterworks Service, 2-In. Through 24-In. (50-mm Through 600-mm) NPS(April 2012)Approved by AWWA Board of Directors Jan. 22, 2012.Approved by American National Standards Institute Feb. 23, 2012.Copyright 2012 American
2、Water Works Association. All Rights Reserved.21. Page 2, Figure 1, revise second caption to read:CoverHinge ArmDiscBodyDiscRingSeatRingFull WaterwayMetal-to-Metal SeatMetal Hinge ArmClear WaterwayResilient-to-Metal Seat(or Metal-to-Metal Seat)Metal Hinge ArmCoverBodyHinge PinHinge ArmDiscSeatRingDis
3、cRingCoverHinge PinHinge ArmResilientFacedDiscBodyFull WaterwayResilent-to-Coated SeatResilient Hinge ArmNOTE: Drawings are illustrative only and not intended to be restrictive as to exact details. 2. Page 1-2, Sec 1.1.3, revise to read:1.1.3 Waterway types. Swing-check valves may be of the clear wa
4、terway design (where the disc in the full open position swings clear of the waterway) or the full waterway design (where the disc in the full open position is not clear of the waterway, but the body is enlarged to provide full waterway area around the disc). Some producers provide flanged clear wate
5、rway valves to either clear or full water-way end-to-end dimension requirements and full waterway valves to either clear or full waterway end-to-end dimension requirements (Sec 4.4.2).Copyright 2012 American Water Works Association. All Rights Reserved.33. Page 9, Sec 4.4.2, revise to read: 4.4.2 En
6、d-to-end dimension. End-to-end dimensions for flanged-end valves are as specified in Table 2. Clear waterway valves shall be made to either clear or full waterway end-to-end dimension requirements and full waterway valves shall be made to either clear or full waterway end-to-end dimension requiremen
7、ts. There are no standard laying lengths for mechanical-joint end valves. The Table 2 dimensions will become effective three years from the effective date of this standard4. Page 10. Table 2, revise to read:Table 2 End-to-end dimensions for flanged-end valves End-to-End Dimensions*Valve SizeNPS Clea
8、r Waterway Full Waterwayin. (mm) in. (mm) in. (mm)2 (50) 8 (203) 8 (203)21/2 (65) 10 (254) 81/2 (216)3 (75) 11 (279) 91/2 (241)4 (100) 13 (330) 111/2 (292)6 (150) 16 (406) 14 (356)8 (200) 191/2 (495) 191/2 (495)10 (250) 22 (559) 241/2 (622)12 (300) 26 (660) 271/2 (699)14 (350) 30 (762) 31 (787)16 (4
9、00) 301/2 (775) 36 (914)18 (450) 331/2 (851) 40 (1,016)20 (500) 40 (1,020) 40 (1,016)24 (600) 46 (1,170) 48 (1,210)*End-to-End tolerances: 2-in. (50-mm) NPS to 10-in. (250-mm) NPS 1/16 in. (1.58 mm) 12-in. (300-mm) NPS to 24-in. (600-mm) NPS 1/8 in. (3.17 mm)Clear waterway valves shall be made to ei
10、ther clear or full waterway end-to-end dimension requirements and full waterway valves shall be made to either clear or full waterway end-to-end dimension requirements (Sec 4.4.2).Sizes 2 in. (50 mm) through 16 in. (400 mm) comply with ASME/ANSI B16.10, “Face-to-Face and End-to-End Dimensions of Ferrous Valves.”Copyright 2012 American Water Works Association. All Rights Reserved.
