A-A-52597
TABLE I. Minimum bore.
|
Nominal valve size |
Minimum bore (ID) |
|
inch (mm) |
inch (mm) |
|
2 (50.8 |
2 (50.8) |
|
3 (76.2) |
3 (76.2) |
|
4 (102) |
4 (102) |
|
6 (152) |
6 (152) |
|
8 (203) |
8 (203) |
|
10 (254) |
10 (254) |
|
12 (305) |
12 (305) |
|
14 (356) |
13.25 (337) |
|
16 (406) |
15.25 (387) |
|
18 (457) |
17.25 (438) |
|
20 (508) |
19.25 (489) |
|
24 (610) |
23.25 (591) |
3.2.1 Cast-iron valves. Cast-iron valves shall conform to MSS SP-71. Unless otherwise specified (see 7.2), the seating shall be bronze.
3.2.1.1 End flanges. End flanges shall be integral with the valve body. Flange facings and drilling shall conform to ANSI B16.1. The flanges shall be finished on the joint side in accordance with MSS SP-6.
3.2.1.2 Covers. Material for the cast-iron valve covers shall be in accordance with ASTM A126, grade B or C.
3.2.1.2.1 Cover bolts. Bolts for the covers shall conform to ASTM A307, grade B, and shall be of the stud, bolt-stud, bolt, or capscrew type. The bolts shall have heavy, unfinished, hexagonal heads. The bolts shall be wet assembled.
3.2.2 Steel valves. Steel valves shall be manufactured in conformance to API SPEC 6D, and shall be either cast or forged steel.
3.2.2.1 End connections. Valve ends shall be flanged, threaded, or beveled for welding (steel valves only), as specified (see 7.2). Threaded ends shall not be furnished on valves with end connections larger than 4 inch (102 mm).
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