Axial Flow Check Valve Face-to-face Dimensions
API 6D Axial Flow Check Valves, Full-opening and Reduced Types—Face-to-face (A) and End-to-end (B and C) Dimensions in inches and millimeters.
Axial flow check valve face to face dimensions (RF ends)
Axial flow check valve face to face dimensions (BW ends)
Axial flow check valve face to face dimensions (RTJ ends)
Axial Flow Check Valves, Full-opening and Reduced Types—Face-to-face (A) and End-to-end (B and C) Dimensions1
Class 150
Dimensions in inches (millimeters)
| NPS | DN | Long Pattern Raised Face / Weld End A/B |
Long Pattern Ring Joint C |
Short Pattern Raised Face and Ring Joint A/C |
Compact Pattern Raised Face and Ring Joint A/C |
| Class 150 | |||||
| 1/2 | 15 | 4.25 (108) | - | 1.96 (50) | |
| 3/4 | 20 | 4.60 (117) | - | 2.36 (60) | |
| 1 | 25 | 5.00 (127) | 5.50 (140) | 4.00 (100) | |
| 1-1/4 | 32 | 5.50 (140) | 6.00 (153) | 4.00 (100) | |
| 1-1/2 | 40 | 6.50 (165) | 7.00 (178) | 4.72 (120) | |
| 2 | 50 | 8.00 (203) | 8.50 (216) | 4.72 (120) | |
| 2-1/2 | 65 | 8.50 (216) | 9.00 (229) | 4.75 (120) | |
| 3 | 80 | 9.50 (241) | 10.00 (254) | 4.75 (120) | |
| 4 | 100 | 11.50 (292) | 12.00 (305) | 5.50 (140) | |
| 6 | 150 | 14.00 (356) | 14.50 (368) | 8.27 (210) | |
| 8 | 200 | 19.50 (495) | 20.00 (508) | 11.02 (280) | |
| 10 | 250 | 24.50 (622) | 25.00(635) | 13.78 (350) | |
| 12 | 300 | 27.50 (699) | 28.00 (711) | 13.78 (350) | 7.25 (181) |
| 14 | 350 | 31.00 (787) | 31.50 (800) | 15.94 (405) | 8.75 (222) |
| 16 | 400 | 34.00 (864) | 34.50 (876) | 17.91 (455) | 9.75 (245) |
| 18 | 450 | 38.50 (978) | 39.00 (991) | 20.47 (520) | 10.50 (264) |
| 20 | 500 | 38.50 (978) | 39.00 (991) | 22.44 (570) | 12.00 (305) |
| 22 | 550 | 42.00 (1067) | 42.50 (1080) | 22.44 (570) | 13.78 (350) |
| 24 | 600 | 51.00 (1295) | 51.50 (1308) | 26.97 (685) | 14.50 (370) |
| 26 | 650 | 51.00 (1295) | — | 29.33 (745) | 14.50 (370) |
| 28 | 700 | 57.00 (1448) | — | 31.50 (800) | 17.00 (430) |
| 30 | 750 | 60.00 (1524) | — | 33.66 (855) | 18.00 (460) |
| 32 | 800 | — | — | 35.83 (910) | 19.75 (500) |
| 34 | 850 | — | — | 38.19 (970) | 20.87 (530) |
| 36 | 900 | 77.00 (1956) | — | 40.55 (1030) | 24.00 (600) |
| 38 | 950 | — | — | 44.69 (1135) | 23.23 (590) |
| 40 | 1000 | — | — | 44.69 (1135) | 25.50 (650) |
| 42 | 1050 | — | — | 47.05 (1195) | 26.25 (670) |
| 48 | 1200 | — | — | 53.74 (1365) | 29.25 (740) |
| 54 | 1350 | — | — | 60.24 (1530) | 32.68 (830) |
| 56 | 1400 | — | — | 62.99 (1600) | 33.46 (850) |
| 60 | 1500 | — | — | 67.32 (1710) | 38.19 (970) |
FOOTNOTE 1 See Figure B.6, Figure B.7, Figure B.10 and Figure B.11 for reference to dimension A, dimension B and
Axial Flow Check Valves, Full-opening and Reduced Types—Face-to-face (A) and End-to-end (B and C) Dimensions1
Class 300
Dimensions in inches (millimeters)
| NPS | DN | Long Pattern Raised Face / Weld End A/B |
Long Pattern Ring Joint C |
Short Pattern Raised Face and Ring Joint A/C |
Compact Pattern Raised Face and Ring Joint A/C |
| Class 300 | |||||
| 1/2 | 15 | — | — | 1.96 (50) | |
| 3/4 | 20 | — | — | 2.36 (60) | |
| 1 | 25 | 8.50 (216) | 9.00 (229) | 4.00 (100) | |
| 1-1/4 | 32 | 9.00 (229) | 9.50 (242) | 4.00 (100) | |
| 1-1/2 | 40 | 9.50 (241) | 10.00 (254) | 4.72 (120) | |
| 2 | 50 | 10.50 (267) | 11.13 (283) | 4.72 (120) | |
| 2-1/2 | 65 | 11.50 (292) | 12.13 (308) | 5.91 (150) | |
| 3 | 80 | 12.50 (318) | 13.13 (333) | 5.91 (150) | |
| 4 | 100 | 14.00 (356) | 14.63 (371) | 6.69 (170) | |
| 6 | 150 | 17.50 (445) | 18.13 (460) | 8.27 (210) | |
| 8 | 200 | 21.00 (533) | 21.63 (549) | 11.02 (280) | |
| 10 | 250 | 24.50 (622) | 25.13 (638) | 13.78 (350) | |
| 12 | 300 | 28.00 (711) | 28.63 (727) | 13.78 (350) | 7.25 (181) |
| 14 | 350 | 33.00 (838) | 33.63 (854) | 15.94 (405) | 8.75 (222) |
| 16 | 400 | 34.00 (864) | 34.63 (879) | 17.91 (455) | 9.75 (245) |
| 18 | 450 | 38.50 (978) | 39.13 (994) | 20.47 (520) | 10.50 (264) |
| 20 | 500 | 40.00 (1016) | 40.75 (1035) | 22.44 (570) | 12.00 (305) |
| 22 | 550 | 44.00 (1118) | 44.88 (1140) | 22.44 (570) | — |
| 24 | 600 | 53.00 (1346) | 53.88 (1368) | 26.97 (685) | 14.50 (370) |
| 26 | 650 | 53.00 (1346) | 54.00 (1372) | 29.33 (745) | — |
| 28 | 700 | 59.00 (1499) | 60.00 (1524) | 31.50 (800) | 17.00 (430) |
| 30 | 750 | 62.75 (1594) | 63.75 (1619) | 33.66 (855) | 18.00 (460) |
| 32 | 800 | — | — | 35.83 (910) | 19.75 (500) |
| 34 | 850 | — | — | 38.19 (970) | — |
| 36 | 900 | 82.00 (2083) | 83.10 (2111) | 40.55 (1030) | 24.00 (600) |
| 38 | 950 | — | — | 44.69 (1135) | — |
| 40 | 1000 | — | — | 44.69 (1135) | 25.50 (650) |
| 42 | 1050 | — | — | 47.05 (1195) | 28.25 (720) |
| 48 | 1200 | — | — | 53.74 (1365) | 33.00 (840) |
| 54 | 1350 | — | — | 60.24 (1530) | — |
| 56 | 1400 | — | — | 62.99 (1600) | 33.46 (850) |
| 60 | 1500 | — | — | 67.32 (1710) | — |
FOOTNOTE 1 See Figure B.6, Figure B.7, Figure B.10 and Figure B.11 for reference to dimension A, dimension B and dimension C Class 600.
Axial Flow Check Valves, Full-opening and Reduced Types—Face-to-face (A) and End-to-end (B and C) Dimensions1
Class 600
Dimensions in inches (millimeters)
| NPS | DN | Long Pattern Raised Face / Weld End A/B |
Long Pattern Ring Joint C |
Short Pattern Raised Face and Ring Joint A/C |
Compact Pattern Raised Face and Ring Joint A/C |
| Class 600 | |||||
| 1/2 | 15 | 6.50 (165) | 6.50 (165) | 1.96 (50) | |
| 3/4 | 20 | 7.50 (190) | 7.50 (190) | 2.36 (60) | |
| 1 | 25 | 8.50 (216) | 8.50 (216) | 4.00 (100) | |
| 1-1/4 | 32 | 9.00 (229) | 9.00 (229) | 4.00 (100) | |
| 1-1/2 | 40 | 9.50 (241) | 9.50 (241) | 4.72 (120) | |
| 2 | 50 | 11.50 (292) | 11.63 (295) | 4.72 (120) | |
| 2-1/2 | 65 | 13.00 (330) | 13.13 (333) | 5.91 (150) | |
| 3 | 80 | 14.00 (356) | 14.13 (359) | 5.91 (150) | |
| 4 | 100 | 17.00 (432) | 17.13 (435) | 6.69 (170) | |
| 6 | 150 | 22.00 (559) | 22.13 (562) | 8.27 (210) | |
| 8 | 200 | 26.00 (660) | 26.13 (664) | 11.02 (280) | |
| 10 | 250 | 31.00 (787) | 31.13 (791) | 13.78 (350) | |
| 12 | 300 | 33.00 (838) | 33.13 (841) | 14.76 (375) | 9.00 (229) |
| 14 | 350 | 35.00 (889) | 35.13 (892) | 17.32 (440) | 10.75 (273) |
| 16 | 400 | 39.00 (991) | 39.13 (994) | 19.69 (500) | 12.00 (305) |
| 18 | 450 | 43.00 (1092) | 43.13 (1095) | 22.24 (565) | 14.25 (362) |
| 20 | 500 | 47.00 (1194) | 47.25 (1200) | 24.61 (625) | 14.50 (368) |
| 22 | 550 | 51.00 (1295) | 51.38 (1305) | 26.97 (685) | — |
| 24 | 600 | 55.00 (1397) | 55.38 (1407) | 29.33 (745) | 17.25 (438) |
| 26 | 650 | 57.00 (1448) | 57.50 (1461) | 31.89 (810) | 18.11 (460) |
| 28 | 700 | 63.00 (1600) | 63.50 (1613) | 34.25 (870) | 19.00 (480) |
| 30 | 750 | 65.00 (1651) | 65.50 (1664) | 36.61 (930) | 20.00 (505) |
| 32 | 800 | — | — | 38.98 (990) | 23.00 (584) |
| 34 | 850 | — | — | 41.54 (1055) | — |
| 36 | 900 | 82.00 (2083) | 82.64 (2099) | 44.09 (1120) | 25.00 (635) |
| 38 | 950 | — | — | 45.26 (1175) | — |
| 40 | 1000 | — | — | 48.82 (1240) | 32.25 (820) |
| 42 | 1050 | — | — | 51.18 (1300) | 34.25 (870) |
| 48 | 1200 | — | — | 58.46 (1485) | 38.25 (970) |
| 54 | 1350 | — | — | 65.75 (1670) | — |
| 56 | 1400 | — | — | 68.11 (1730) | 38.25 (970) |
| 60 | 1500 | — | — | 73.03 (1855) | — |
FOOTNOTE 1 See Figure B.6, Figure B.7, Figure B.10 and Figure B.11 for reference to dimension A, dimension B and dimension C.
Axial Flow Check Valves, Full-opening and Reduced Types—Face-to-face (A) and End-to-end (B and C) Dimensions1
Class 900
Dimensions in inches (millimeters)
| NPS | DN | Long Pattern Raised Face / Weld End A/B |
Long Pattern Ring Joint C |
Short Pattern Raised Face and Ring Joint A/C |
Compact Pattern Raised Face and Ring Joint A/C |
| Class 900 | |||||
| 1/2 | 15 | — | — | 2.17 (55) | |
| 3/4 | 20 | 9.00 (229) | 9.00 (229) | 2.36 (60) | |
| 1 | 25 | 10.00 (254) | 10.00 (254) | 6.00 (150) | |
| 1-1/4 | 32 | 11.00 (279) | 11.00 (279) | 6.00 (150) | |
| 1-1/2 | 40 | 12.00 (305) | 12.00 (305) | 6.70 (170) | |
| 2 | 50 | 14.50 (368) | 14.63 (371) | 6.70 (170) | |
| 2-1/2 | 65 | 16.50 (419) | 16.63 (422) | 7.48 (190) | |
| 3 | 80 | 15.00 (381) | 15.13 (384) | 7.48 (190) | |
| 4 | 100 | 18.00 (457) | 18.13 (460) | 8.27 (210) | |
| 6 | 150 | 24.00 (610) | 24.13 (613) | 9.06 (230) | |
| 8 | 200 | 29.00 (737) | 29.13 (740) | 11.02 (280) | |
| 10 | 250 | 33.00 (838) | 33.13 (841) | 13.78 (350) | |
| 12 | 300 | 38.00 (965) | 38.13 (968) | 16.93 (430) | 12.25 (310) |
| 14 | 350 | 40.50 (1029) | 40.88 (1038) | 15.75 (400) | 14.00 (356) |
| 16 | 400 | 44.50 (1130) | 44.88 (1140) | 18.50 (470) | 15.00 (384) |
| 18 | 450 | 48.00 (1219) | 48.50 (1232) | 20.87 (530) | 16.50 (420) |
| 20 | 500 | 52.00 (1321) | 52.50 (1334) | 23.43 (595) | 17.00 (430) |
| 22 | 550 | — | — | 24.80 (630) | — |
| 24 | 600 | 61.00 (1549) | 61.75 (1568) | 26.18 (665) | 19.50 (495) |
| 26 | 650 | — | — | 31.30 (795) | — |
| 28 | 700 | — | — | 33.86 (860) | 21.25 (540) |
| 30 | 750 | — | — | 36.42 (925) | 22.00 (560) |
| 32 | 800 | — | — | 36.42 (925) | 24.75 (580) |
| 34 | 850 | — | — | 38.98 (990) | — |
| 36 | 900 | — | — | 41.34 (1050) | 27.00 (690) |
| 38 | 950 | — | — | 44.29 (1125) | — |
| 40 | 1000 | — | — | 46.65 (1185) | 38.25 (970) |
| 42 | 1050 | — | — | 49.21 (1250) | 43.25 (1100) |
| 48 | 1200 | — | — | 57.09 (1450) | 49.25 (1250) |
FOOTNOTE 1 See Figure B.6, Figure B.7, Figure B.10 and Figure B.11 for reference to dimension A, dimension B and dimension C.
Axial Flow Check Valves, Full-opening and Reduced Types—Face-to-face (A) and End-to-end (B and C) Dimensions1
Class 1500-2500
Dimensions in inches (millimeters)
| NPS | DN | Long Pattern Raised Face / Weld End A/B |
Long Pattern Ring Joint C |
Short Pattern Raised Face and Ring Joint A/C |
Compact Pattern Raised Face and Ring Joint A/C |
| Class 1500 | |||||
| 1/2 | 15 | 8.50 (216) | 8.50 (216) | 2.17 (55) | |
| 3/4 | 20 | 9.00 (229) | 9.00 (229) | 2.36 (60) | |
| 1 | 25 | 10.00 (254) | 10.00 (254) | 6.00 (150) | |
| 1-1/4 | 32 | 11.00 (279) | 11.00 (279) | 6.00 (150) | |
| 1-1/2 | 40 | 12.00 (305) | 12.00 (305) | 6.70 (170) | |
| 2 | 50 | 14.50 (368) | 14.63 (371) | 6.70 (170) | |
| 2-1/2 | 65 | 16.50 (419) | 16.63 (422) | 7.48 (190) | |
| 3 | 80 | 18.50 (470) | 18.63 (473) | 8.66 (220) | |
| 4 | 100 | 21.50 (546) | 21.63 (549) | 9.45 (240) | |
| 6 | 150 | 27.75 (705) | 28.00 (711) | 12.20 (310) | |
| 8 | 200 | 32.75 (832) | 33.13 (841) | 13.78 (350) | |
| 10 | 250 | 39.00 (991) | 39.38 (1000) | 15.75 (400) | |
| 12 | 300 | 44.50 (1130) | 45.13 (1146) | 17.72 (450) | — |
| 14 | 350 | 49.50 (1257) | 50.25 (1276) | 19.29 (490) | — |
| 16 | 400 | 54.50 (1384) | 55.38 (1407) | 20.87 (530) | — |
| 18 | 450 | 60.50 (1537) | 61.38 (1559) | 22.83 (580) | — |
| 20 | 500 | 65.50 (1664) | 66.38 (1686) | 25.79 (655) | — |
| 22 | 550 | — | — | — | — |
| 24 | 600 | 76.50 (1943) | 77.63 (1972) | 29.53 (750) | — |
| Class 2500 | |||||
| 1/2 | 15 | 10.40 (264) | 10.40 (264) | 2.36 (60) | |
| 3/4 | 20 | 10.75 (273) | 10.75 (273) | 2.56 (65) | |
| 1 | 25 | 12.13 (308) | 12.13 (308) | 6.30 (160) | |
| 1-1/4 | 32 | 13.75 (349) | 13.86 (352) | 7.00 (180) | |
| 1-1/2 | 40 | 15.12 (384) | 15.25 (387) | 8.27 (210) | |
| 2 | 50 | 17.75 (451) | 17.88 (454) | 8.27 (210) | |
| 2-1/2 | 65 | 20.00 (508) | 20.25 (514) | 9.45 (240) | |
| 3 | 80 | 22.75 (578) | 23.00 (584) | 10.63 (270) | |
| 4 | 100 | 26.50 (673) | 26.88 (683) | 12.20 (310) | |
| 6 | 150 | 36.00 (914) | 36.50 (927) | 139.93 (430) | |
| 8 | 200 | 40.25 (1022) | 40.88 (1038) | 18.11 (460) | |
| 10 | 250 | 50.00 (1270) | 50.88 (1292) | 22.83 (580) | |
| 12 | 300 | 56.00 (1422) | 56.88 (1445) | 22.83 (580) | — |
