Main Features:
1. Bidirectional Seal: Capable of sealing both forward and reverse media pressures, suitable for complex operating conditions.
2. Corrosion Resistance: The core component material combination withstands long-term erosion from corrosive media like seawater.
3. Long Life: Optimized butterfly disc design and wear-resistant coating extend valve life.
4. Offshore Engineering: Suitable for highly corrosive environments such as nuclear power plant seawater cooling and offshore platforms.
5. Chemical Industry: Suitable for handling acidic and alkaline media, oil product transportation, and other applications.
6. Supports multiple drive modes, including worm gear, electric, pneumatic, and hydraulic, facilitating remote control and automation integration.
Technical Parameters:

Seawater Butterfly Valve Dimensions | ||||||||
DN | L | H1 | E | H | ||||
Worm gear | Pneumatic | Electric | Worm gear | Pneumatic | Electric | |||
100 | 127 | 150 | 200 | 355 | 255 | 420 | 675 | 600 |
125 | 140 | 170 | 200 | 355 | 255 | 460 | 715 | 640 |
150 | 140 | 210 | 280 | 355 | 315 | 550 | 800 | 705 |
200 | 152 | 245 | 425 | 250 | 315 | 760 | 850 | 775 |
250 | 165 | 276 | 425 | 250 | 315 | 830 | 925 | 945 |
300 | 178 | 280 | 560 | 450 | 315 | 895 | 1035 | 1070 |
350 | 190 | 325 | 560 | 450 | 315 | 950 | 1070 | 1140 |
400 | 216 | 345 | 580 | 450 | 315 | 1190 | 1190 | 1210 |
450 | 222 | 390 | 580 | 650 | 714 | 1255 | 1250 | 1335 |
500 | 229 | 442 | 580 | 650 | 714 | 1305 | 1290 | 1415 |
600 | 267 | 505 | 660 | 850 | 810 | 1340 | 1455 | 1605 |
700 | 292 | 550 | 550 | 850 | 810 | 1520 | 1585 | 1844 |
800 | 318 | 605 | 550 | 1250 | 810 | 1710 | 1700 | 2040 |
900 | 330 | 665 | 550 | 1250 | 863 | 1810 | 1965 | 2255 |
1000 | 410 | 710 | 750 | 1250 | 863 | 1960 | 2015 | 2380 |
1200 | 470 | 835 | 925 | 12S0 | 863 | 2250 | 250 | 2640 |
1400 | 530 | 935 | 925 | 1250 | 1055 | 2434 | 2550 | 2866 |
1600 | 600 | 1060 | 925 | 1250 | 1055 | 2780 | 2750 | 3156 |
1800 | 670 | 1175 | 980 | 1250 | 1183 | 3020 | 2950 | 3421 |
2000 | 760 | 1265 | 980 | 1500 | 1286 | 3270 | 3350 | 3685 |

Seawater Butterfly Valve Dimensions | ||||||
Dimensions | L | H1 | H | |||
DN | NPS | PN6/PN10/PN16/PN25/PN40 CLass 150/CLass 300 | Worm gear | Pneumatic | Electric | |
100 | 4 | 190 | 120 | 376 | 630 | 555 |
125 | 5 | 200 | 130 | 386 | 640 | 565 |
150 | 6 | 210 | 140 | 452 | 696 | 602 |
200 | 8 | 230 | 180 | 530 | 740 | 650 |
250 | 10 | 250 | 230 | 620 | 790 | 740 |
300 | 12 | 270 | 240 | 698 | 838 | 850 |
350 | 14 | 290 | 270 | 778 | 900 | 970 |
400 | 16 | 310 | 300 | 846 | 930 | 1010 |
450 | 18 | 330 | 340 | 1005 | 998 | 1082 |
500 | 20 | 350 | 360 | 1058 | 1045 | 1175 |
600 | 24 | 390 | 410 | 1195 | 1235 | 1410 |
700 | 28 | 430 | 510 | 1308 | 1390 | 1650 |
800 | 32 | 470 | 560 | 1505 | 1500 | 1830 |
900 | 36 | 510 | 620 | 1650 | 1810 | 2240 |
1000 | 40 | 550 | 670 | 1718 | 1860 | 2320 |
1200 | 48 | 630 | 780 | 2015 | - | 2406 |
1400 | 56 | 710 | 880 | 2265 | - | 2660 |
1600 | 64 | 790 | 1020 | 2547 | - | 2895 |

DQ342H-2.5/6/10/16 Flanged Telescopic Seawater Butterfly Valve Dimensions | ||||||||||||||||
DN | L | Expansion △L | HI | H2 | H3 | A1 | A2 | Φ | 0.25MPa | 0.6MPa | 1.0MPa | 1.6MPa | ||||
D1 | n-d | D1 | n-d | D1 | n-d | D1 | n-d | |||||||||
50 | 150 | ±10 | 82.5 | 150 | 66 | 135 | 42 | 150 | 110 | 4-Φ14 | 110 | 4-Φ14 | 125 | 4-Φ19 | 125 | 4-Φ19 |
65 | 170 | ±10 | 92.5 | 165 | 66 | 135 | 42 | 150 | 130 | 4-Φ14 | 130 | 4-Φ14 | 145 | 4-Φ19 | 145 | 4-Φ19 |
80 | 180 | ±10 | 100 | 170 | 66 | 135 | 42 | 150 | 150 | 4-Φ19 | 150 | 4-Φ19 | 160 | 8-Φ19 | 160 | 8-Φ19 |
100 | 190 | ±10 | 125 | 195 | 11 | 135 | 42 | 180 | 170 | 4-Φ19 | 170 | 4-Φ19 | 180 | 8-Φ19 | 180 | 8-Φ19 |
125 | 200 | ±10 | 142 | 220 | 77 | 135 | 42 | 180 | 200 | 8-Φ19 | 200 | 8-Φ19 | 210 | 8-Φ19 | 210 | 8-Φ19 |
150 | 210 | ±10 | 160 | 250 | 77 | 135 | 42 | 320 | 225 | 8-Φ19 | 225 | 8-Φ19 | 240 | 8-Φ23 | 240 | 8-Φ23 |
200 | 230 | ±12 | 190 | 275 | 107 | 202 | 60 | 320 | 280 | 8-Φ19 | 280 | 8-Φ19 | 295 | 8-Φ23 | 295 | 12-Φ23 |
250 | 250 | ±12 | 220 | 305 | 107 | 202 | 60 | 320 | 335 | 12-Φ19 | 335 | 12-Φ19 | 350 | 12-Φ23 | 355 | 12-Φ28 |
300 | 270 | ±15 | 245 | 350 | 126 | 220 | 93 | 320 | 395 | 12-Φ23 | 395 | 12-Φ23 | 400 | 12-Φ23 | 410 | 12-Φ28 |
350 | 290 | ±15 | 278 | 385 | 126 | 220 | 93 | 320 | 445 | 12-Φ23 | 445 | 12-Φ23 | 460 | 16-Φ23 | 470 | 16-Φ28 |
400 | 310 | ±15 | 305 | 435 | 157 | 287 | 123 | 400 | 495 | 16-Φ23 | 495 | 16-Φ23 | 515 | 16-Φ28 | 525 | 16-Φ31 |
450 | 330 | ±15 | 346 | 490 | 157 | 287 | 123 | 400 | 550 | 16-Φ23 | 550 | 15-Φ23 | 565 | 20-Φ28 | 585 | 20-Φ31 |
500 | 350 | ±20 | 375 | 505 | 165 | 360 | 184 | 390 | 600 | 20-Φ23 | 600 | 20-Φ23 | 620 | 20-Φ28 | 650 | 20-Φ34 |
600 | 390 | ±20 | 425 | 605 | 165 | 360 | 184 | 390 | 705 | 20-Φ26 | 705 | 20-Φ26 | 725 | 20-Φ31 | 770 | 20-Φ37 |
700 | 430 | ±20 | 495 | 675 | 195 | 410 | 204 | 500 | 810 | 24-Φ26 | 810 | 2-Φ26 | 840 | 24-Φ31 | 840 | 24-Φ37 |
800 | 470 | ±30 | 560 | 740 | 195 | 410 | 204 | 500 | 920 | 24-Φ31 | 920 | 24-Φ31 | 950 | 24-Φ34 | 950 | 24-Φ40 |
900 | 510 | ±30 | 625 | 805 | 235 | 521 | 217 | 500 | 1020 | 24-Φ31 | 1020 | 24-Φ31 | 1050 | 28-Φ34 | 1050 | 28-Φ40 |
1000 | 550 | ±30 | 680 | 865 | 235 | 521 | 217 | 500 | 1120 | 28-Φ31 | 1120 | 28-Φ31 | 1160 | 28-Φ37 | 1170 | 28-Φ43 |
1200 | 630 | ±35 | 800 | 1065 | 251 | 501 | 290 | 630 | 1320 | 32-Φ31 | 1340 | 32-Φ34 | 1380 | 32-Φ40 | 1390 | 32-Φ49 |
1400 | 710 | ±35 | 920 | 1207 | 343 | 656 | 312 | 800 | 1520 | 36-Φ31 | 1560 | 36-Φ37 | 1590 | 36-Φ43 | 1590 | 36-Φ49 |
1600 | 790 | ±40 | 1030 | 1317 | 370 | 750 | 414 | 800 | 1730 | 40-Φ31 | 1760 | 40-Φ37 | 1820 | 40-Φ49 | 1820 | 40-Φ56 |
1800 | 870 | ±40 | 1245 | 1457 | 470 | 800 | 440 | 900 | 1930 | 44-Φ31 | 1970 | 44-Φ40 | 2020 | 44-Φ48 | 2020 | 44-Φ56 |
2000 | 950 | ±50 | 1290 | 1625 | 470 | 800 | 440 | 900 | 2130 | 48-Φ30 | 2180 | 48-Φ43 | 2230 | 48-Φ48 | 2230 | 48-Φ62 |
2200 | 1000 | ±50 | 1450 | 1740 | 470 | 800 | 440 | 900 | 2340 | 52-Φ33 | 2390 | 52-Φ43 | 2440 | 52-Φ56 | 2440 | 52-Φ62 |
2400 | 1100 | ±50 | 1675 | 1875 | 480 | 990 | 595 | 1000 | 2540 | 56-Φ33 | 2600 | 56-Φ43 | 2650 | 56-Φ56 | 2650 | 56-Φ62 |
2600 | 1200 | ±50 | 1745 | 2010 | 480 | 990 | 595 | 1000 | 2740 | 60-Φ33 | 2810 | 60-Φ48 | 2850 | 60-Φ55 | 2850 | 60-d62 |
2800 | 1300 | ±50 | 1818 | 2100 | 480 | 990 | 595 | 1000 | 2950 | 64-Φ36 | 3020 | 64-Φ48 | 3070 | 64-Φ56 | 3070 | 64-Φ70 |
3000 | 1400 | ±50 | 1910 | 2200 | 480 | 990 | 595 | 1000 | 3160 | 68-Φ36 | 3220 | 68-Φ48 | 3290 | 68-Φ62 | 3300 | 68-Φ70 |