scope:

General 

Application. This Standard covers face-to-face and end-to-end dimensions of straightway valves, and center-to-face and center-to-end dimensions of angle valves. Its purpose is to ensure installation interchangeability for valves of a given material, type, size, rating class, and end connection. Face-to-face and center-toface dimensions apply to flanged end valves with facings defined in para. 2.3.1 and to other valves intended for assembly between flat face or raised face flanges. Endto- end dimensions apply to grooved end, buttwelding end, and flanged end valves with facings defined in para. 2.3.3. Center-to-end dimensions apply to buttwelding end and to flanged end valves with facings defined in para. 2.3.3. 

Data Source Reference. Throughout this Standard, data references are cited, e.g., "extracted from" and "compatible with." These data are relevant to the reference standard in place at the date shown in the Foreword for American National Standards Institute approval of this Standard. 

Standard Units

This Standard states values in both SI (Metric) and U.S. Customary units. These systems of units are to be regarded separately as standard. Within the text, the U.S. Customary units are shown in parentheses or in separate tables that appear in Mandatory Appendix I. The values stated in each system are not exact equivalents; therefore, it is required that each system of units be used independently of the other. Combining values from the two systems constitutes nonconformance with the Standard. 

Cast Iron Valves

Only flanged end valves (and others intended for assembly between flanges) are covered by this Standard. Mating dimensions and facings of flanged ends conform to those in ASME B16.1. Dimensional tables for various types and sizes of valves are specified in paras. 1.3.1 through 1.3.4. 

Gate, Plug, and Check Valves

(a) Class 125 - Tables 1 and I-1

(b) Class 250 - Tables 2 and I-2 1 

Globe and Angle Valves

(a) Class 125 - Tables 1 and I-1

(b) Class 250 - Tables 2 and I-2 

Wafer Swing Check Valves

(a) Class 125 - Tables 7 and I-7

(b) Class 250 - Tables 7 and I-7 

Butterfly Valves

(a) Class 25 - Tables 8 and I-8

(b) Class 125 - Tables 8 and I-8

Ductile Iron Valves

Only flanged end valves (and others intended for assembly between flanges) are covered. Mating dimensions and facings of flanged ends conform to those in ASME B16.42. Valves are rated Class 150 and Class 300. The following cast iron and steel dimensional tables are also used for ductile valves:

(a) Class 150 - Tables 1 and I-1

(b) Class 300 - Tables 2 and I-2 

Steel and Alloy Valves

This category includes carbon, alloy, and stainless steels, and the nonferrous materials listed in ASME B16.34. It includes flanged, buttwelding, and grooved ends, as well as the types of valves intended for assembly between flanges. Mating dimensions and facings of flanged ends conform to those in ASME B16.5, ASME B16.47, Series A, or MSS SP-44. [For flanged end butterfly valves, refer to Note (2) of Table 8 (Table I-8) for flange information.] For flangeless or wafer valves intended for assembly between flanges, refer to Tables 7 and 8 (Tables I-7 and I-8) for flange information. Only buttwelding end valves in rating Classes 150 through 2500 are included in this Standard. Dimensional tables for various types and sizes of valves are specified in paras. 1.5.1 through 1.5.5. 

Gate, Globe, Angle, Check, Plug, and Ball Valves

(a) Class 150 - Tables 1 and I-1

(b) Class 300 - Tables 2 and I-2

(c) Class 600 - Tables 3 and I-3

(d) Class 900 - Tables 4 and I-4

(e) Class 1500 - Tables 5 and I-5

(f) Class 2500 - Tables 6 and I-6

Y-Pattern Globe and Y-Pattern Swing Check Valves

Class 150 - Tables 1 and I-1 

Wafer Knife Gate Valves

(a) Class 150 - Tables 7 and I-7

(b) Class 300 - Tables 7 and I-7

Wafer Swing Check Valves

Class 150 to 2500- Tables 7 and I-7 

Butterfly Valves

(a) Class 150 - Tables 8 and I-8

(b) Class 300 - Tables 8 and I-8

(c) Class 600 - Tables 8 and I-8 

Convention For determining conformance with this Standard, the convention for fixing significant digits where limits (maximum and minimum values) are specified shall be as defined in ASTM E29. This requires that an observed or calculated value be rounded off to the nearest unit in the last right-hand digit used for expressing the limit. Decimal values and tolerances do not imply a particular method of measurement.