Worm Gear Hard-sealed Flange Butterfly Valve
manufacturer: Shanghai MeiYan Yi Pump & Valve Co., Ltd.
Eml: sales@1bengfa.com
Tel: +86 (21) 5640 2009
Mob: +86 138 1691 3072（WeChat Same Account）
product drawing
Worm gear hard-sealed flange butterfly valves
Technical performance
D343H worm gear hard-sealed flange butterfly valve uses three-eccentric sealing structure, seat and disc almost are no wear and tear, with the more closed more tight sealing function. The sealing ring made of stainless steel with dual advantages of metal hard-sealed and flexible sealing. In terms of low temperature and high temperature conditions, the D343H worm gear hard-sealed flange butterfly valve manufactured by Shanghai Fengqi Industry Development Co.,ltd has excellent sealing performance and long service life. The disc sealing face of D343H worm gear hard-sealed flange butterfly valve manufactured by Shanghai Fengqi Industry Development Co.,ltd, uses cobalt-based alloy welding. The sealing face is wear resistance and has a long service life.Oversized disc adopts lattice structure, has high strength, over-current area, small flow resistance. The valve also has bi-directional sealing capabilities, it can be installed in any direction without restricted by media flow and affected by position and space.
Dimensions & constructral diagram
Worm gear hard-sealed flange butterfly valve constructral diagram(pic1)
Worm gear hard-sealed flange butterfly valve constructral diagram(pic2)
The main technical parameters
| nominal diameter DN（mm) | 50～2000 | |||
| nominal pressure PN（MPa) | 0.6 | 1.0 | 1.6 | 2.5 |
| sealing test (MPa) | 0.66 | 1.1 | 1.76 | 2.75 |
| intensity test(MPa) | 0.9 | 1.5 | 2.4 | 3.75 |
| suitable temperature | Carbon steel：-29℃～425℃ stainless steel：-40℃～650℃ | |||
| applicable medium | water,air,natural gas,oil, and weak corrosive fluid | |||
| leakage rate | According with GB/T13927-92 standard | |||
| drive mode | worm gear drive,electric,pneumatic,hydraulic | |||
The materials of main parts
| part name | materials |
| body | WCB, alloy steel, stainless steel, QT4500 |
| disc | WCB, alloy steel, stainless steel, QT4500 |
| shaft | 2Cr13 stainless steel, alloy steel |
| sealing ring | stainless steel ring |
| packing | flexible graphite |
Standard
| manufacture standard | JB/T 8527-97 |
| flange standard | GB9113-2000 |
| face to face dimension standard | GB12221-89 |
| inspection standard | GB/T 13927-92 |
The main external and connection dimensions of D343H-10/16/25
| nominal diameter （DN）(mm) | main dimensions | flange dimensions and bolt dimensions | ||||||||||
| 1.0 MPa | 1.6 MPa | 2.5 Mpa | ||||||||||
| L | H1 | H | D | D1 | n-Фd | D | D1 | n-Фd | D | D1 | n-Фd | |
| 50 | 108 | 350 | 112 | 165 | 125 | 4-18 | 165 | 125 | 4-18 | 165 | 125 | 4-18 |
| 65 | 112 | 370 | 115 | 185 | 145 | 4-18 | 185 | 145 | 4-18 | 185 | 145 | 8-18 |
| 80 | 114 | 380 | 120 | 200 | 160 | 4-18 | 200 | 160 | 8-18 | 200 | 160 | 8-18 |
| 100 | 127 | 420 | 138 | 220 | 1801 | 8-18 | 220 | 180 | 8-18 | 235 | 190 | 8-22 |
| 125 | 140 | 460 | 164 | 250 | 210 | 8-18 | 250 | 210 | 8-18 | 270 | 220 | 8-26 |
| 150 | 140 | 555 | 175 | 285 | 240 | 8-22 | 285 | 240 | 8-22 | 300 | 250 | 8-26 |
| 200 | 152 | 760 | 200 | 340 | 295 | 8-22 | 340 | 295 | 12-22 | 360 | 310 | 12-26 |
| 250 | 165 | 830 | 243 | 395 | 350 | 12-22 | 405 | 355 | 12-26 | 425 | 370 | 12-30 |
| 300 | 178 | 895 | 250 | 445 | 400 | 12-22 | 460 | 410 | 12-26 | 485 | 430 | 16-30 |
| 350 | 190 | 950 | 280 | 505 | 460 | 16-22 | 520 | 470 | 16-26 | 555 | 490 | 16-33 |
| 400 | 216 | 1190 | 305 | 565 | 515 | 16-26 | 580 | 525 | 16-30 | 620 | 550 | 16-36 |
| 450 | 222 | 1255 | 350 | 615 | 565 | 20-26 | 640 | 585 | 20-30 | 670 | 600 | 20-36 |
| 500 | 229 | 1305 | 380 | 670 | 620 | 20-26 | 715 | 650 | 20-33 | 730 | 660 | 20-36 |
| 600 | 267 | 1340 | 445 | 780 | 725 | 20-30 | 840 | 770 | 20-36 | 845 | 770 | 20-39 |
| 700 | 292 | 1520 | 480 | 895 | 840 | 24-30 | 910 | 840 | 24-36 | 960 | 875 | 24-42 |
| 800 | 318 | 1710 | 530 | 1015 | 950 | 24-33 | 1025 | 950 | 24-39 | 1085 | 990 | 24-48 |
| 900 | 330 | 1810 | 580 | 1115 | 1050 | 28-33 | 1125 | 1050 | 28-39 | 1185 | 1090 | 28-48 |
| 1000 | 410 | 1960 | 650 | 1230 | 1160 | 28-36 | 1255 | 1170 | 28-42 | 1320 | 1210 | 28-56 |
| 1200 | 470 | 2250 | 760 | 1455 | 1380 | 32-39 | 1485 | 1390 | 32-48 | 1530 | 1420 | 32-56 |
| 1400 | 530 | 2435 | 850 | 1675 | 1590 | 36-42 | 1685 | 1590 | 36-48 | 1755 | 1640 | 36-62 |
| 1600 | 600 | 2780 | 1030 | 1915 | 1820 | 40-48 | 1930 | 1820 | 40-56 | 1975 | 1860 | 40-62 |
| 1800 | 670 | 3020 | 1230 | 2115 | 2020 | 44-48 | 2130 | 2020 | 44-56 | 2195 | 2070 | 44-70 |
| 2000 | 760 | 3270 | 1350 | 2325 | 2230 | 48-48 | 2345 | 2230 | 48-62 | 2425 | 2300 | 48-70 |
