ASME B16.10:2017 pdf download.FACE-TO- FACE AND END-TO- END DIMENSIONS OF VALVES.
3.3 Ring Joint Facings
The X dimension given in Table 10 (Table 1-10), when added to the face-to-face dimension of a valve having raised face flanges in Tables I through 6 (Tables I-I through 1-6), establishes the end-to-end dimension for the valve having flanges with ring joint facings.
4 VARIATIONS OF LENGTh WITHIN A CLASS OF VALVES
4.1 Buttwelding End Valves
tables I through 6 (Tables I-I through 1-6) include end-to-end dimensions for valves having buttwelding ends. In many cases, the dimensions are different from those of face-to-face dimensions of flanged valves, as evidenced by the differences between dimensions A and B of the tables.
Also see para. 2.4.
4.1.1 Short Pattern. For pressure seal or flangeless bonnet valves having buttwelding ends in Class 6(X) and higher, the regular end-to-end dimensions shall be equal to the short pattern dimensions shown in Tables 3 through 6 (Tables 1-3 through 1-6). At the manufacturer’s option, the end-to-end dimensions of these valves may be the same as the face-to-face dimensions of raised face flanged valves.
4.1.2 Long Pattern. lor flanged bonnet valves having buttwekiing ends in Class 6(X) and higher, the regular end-to-end dimensions shall be equal to the face-to-face dimensions of raised face flanged valves shown in Tables 3 through 6 (Tables 1-3 through 1-6). At the manufacturer’s option, the end-to-end dimensions may be the same as the short pattern end-to-end dimensions.
4.2 Narrow, Wide, and Extra Wide Designations
Certain butterfly valves are designated narrow, wide, or extra wide for the purpose of consolidating a diversit of manufacturer’s lengths into two or three sets of dimensions for a given size. At the manufacturer’s option, any of the two or three dimensions listed for a size may be used.
5 TOLERANCES
5.1 Stralghtway Valves
A tolerance of ±1.5 mm (±0.06 in.) shall be allowed on face-to-face and end-to-end dimensions of valves of NPS 10 and smaller, and a tolerance of ±3.0 mm (±0.12 in.) shall be allowed for NPS 12 and larger. For exceptions as related to waler type and butterfly valves.ASME B16.10 pdf download.