Face to Face dimensions of flanged valves ASME B16.10 Class 300

NPS	Ball Long Pattern	Ball Short Pattern	Gate Solid Wedge Double Disc	Gate Solid Wedge Double Disc Conduit	Plug Short Venturi Pattern
1/2	140	140		140 (1)
3/4	152	152		152 (1)
1	165	165		165 (1)	159 (2)
1¼	178	178		178 (1)
1½	190	190		190	190 (2)
2	216	216	216	216	216
2½	241	241	241	241	241
3	282	282	282	282	282
4	305	305	305	305	305
5			381	381
6	403	403	403	403	403
8	502	419	419	419	419
10	568	457	457	457	457
12	648	502	502	502	502
14	762	572	572	762	762 (3)
16	838	610	610	838	838 (3)
18	914	660	660	914	914 (3)
20	991	711	711	991	991 (3)
22	1092			1092	1092 (3)
24	1143	813	787	1143	1143 (3)
26	1245			1245	1245 (3)
28	1346			1346	1346 (3)
30	1397			1397	1397 (3)
32	1524			1524	1524 (3)
34	1626			1626	1626 (3)
36	1727			1727	1727 (3)

Other Pressure Classes

NPS	Plug Regular Pattern	Plug Round Port Full Bore	Globe Lift Check	Swing Check
1/2			152
3/4			178
1		190	203	216
1¼			216	229
1½		241	229	241
2		282	267	267
2½		330	292	292
3		387	318	318
4		457	356	356
5			400	400
6	403	559	444	444
8	502	686	559	533
10	568	826	622	622
12	711	965	711	711
14	762			838
16	838			864
18	914			978
20	991			1016
22	1092			1118
24	1143			1346
26	1245			1346
28	1346			1499
30	1397			1594
32	1524
34	1626
36	1727			2083

Notes:

(1) Solid wedge only
(2) Short Pattern only
(3) Venturi Pattern only

General notes:

• Dimensions are in millimeters unless otherwise indicated.
• The face-to-face dimension for flanged Valves is the distance between the extreme ends which are the gasket contact surfaces.
• End-to-End dimensions apply to flanged Valves where the gasket contact surfaces are not located at the extreme ends of the Valve. The distance between the extreme ends is described as the end-to-end dimension and applies to flanged Valves like: Ring Joint, large or small female and large or small groove.
via:http://www.wermac.org/valves/dim_valves_ff_300.html