manual worm gear blind valve
technical parameter
nominal diameter: dn300~2000mm
nominal pressure: pn0.05~0.25mpa
applicable temperature: -20℃~300℃
applicable temperature: 200°c (silicon rubber) 300°c (fluorine rubber)
drive mode: electric, hydraulic, pneumatic, electro-hydraulic
body material: carbon steel, rubber, chrome steel
design standard: api 600, api6d, asme b16.34, gb/t 12234
structure length: asme b16.10, api6d, gb/t 12221
connection standard: asme b16.5, asme b16.47, gb/t 9113, jb/t 79, hg/t 20592
pressure test: api 598, gb/t 13927, jb/t 9092
pressure-temperature class: asme b16.34, gb/t 12224
structural features
the manual worm gear blind valve is mainly composed of the left valve body, the right valve body, the screw pair, the flap, the sealing ring, the lever, the worm gear device and other parts, and a rigid structure is formed by the base and the support column. the rubber sealing ring is embedded on the flip plate, which has the characteristics of high temperature resistance, good sealing performance, convenient replacement and long service life.
main performance parameters
| nominal pressure mpa | 0.25 | 0.15 | 0.10 | 0.05 |
| sealing test pressure mpa | 0.275 | 0.165 | 0.11 | 0.055 |
| strength test pressure mpa | 0.40 | 0.225 | 0.15 | 0.075 |
| drive source | compressed air 0.4-0.6mpa; oil pressure 6.3mpa; 3-phase 380v 50hz | |||
| applicable temperature ℃ | nitrile rubber | silicone rubber | fluororubber | |
| -20-100 | -20-200 | -20-300 | ||
| applicable media | gas and other toxic, harmful and flammable gases | |||
| opening and closing time s | ≤60 | |||
| material of main parts | the valve body and gate are made of carbon steel; the screw rod is made of alloy steel; the nut is made of manganese-copper alloy and ductile iron; the expansion joint is made of stainless steel | |||
main connection size
| dn | l | d | d1 | h | h1 | a | b | n-d |
| 300 | 450 | 440 | 395 | 1200 | 380 | 480 | 22 | 12-22 |
| 350 | 450 | 490 | 445 | 1300 | 420 | 520 | 22 | 12-22 |
| 400 | 450 | 540 | 495 | 1400 | 560 | 580 | 22 | 16-22 |
| 450 | 500 | 595 | 550 | 1400 | 560 | 650 | 24 | 16-22 |
| 500 | 500 | 645 | 600 | 1480 | 600 | 800 | 24 | 16-22 |
| 600 | 600 | 755 | 705 | 1600 | 760 | 1000 | 24 | 20-26 |
| 700 | 600 | 860 | 810 | 1680 | 880 | 1050 | 26 | 24-26 |
| 800 | 800 | 975 | 920 | 1860 | 1125 | 1129 | 26 | 24-30 |
| 900 | 800 | 1075 | 1020 | 2055 | 1270 | 1242 | 28 | 24-30 |
| 1000 | 800 | 1175 | 1120 | 2240 | 1400 | 1375 | 30 | 28-30 |
| 1100 | 800 | 1275 | 1220 | 2425 | 1535 | 1510 | 30 | 28-30 |
| 1200 | 800 | 1375 | 1320 | 2620 | 1680 | 1625 | 30 | 32-30 |
| 1300 | 800 | 1475 | 1420 | 2760 | 1770 | 1749 | 30 | 32-30 |
| 1400 | 850 | 1575 | 1520 | 2960 | 1925 | 1856 | 32 | 36-30 |
| 1500 | 850 | 1690 | 1630 | 3105 | 2050 | 1976 | 32 | 36-30 |
| 1600 | 850 | 1790 | 1730 | 3300 | 2160 | 2093 | 32 | 40-30 |
| 1800 | 1100 | 1990 | 1930 | 3610 | 2370 | 2335 | 32 | 44-30 |
| 2000 | 1100 | 2190 | 2130 | 3960 | 2620 | 2570 | 32 | 46-30 |