Ductile iron material knife gate valve is a kind of gate valve. It is a straight-stroke cut-off valve. The head of the knife gate valve has an oblique blade, which has a certain cutting effect on the medium. It is suitable for the treatment of media containing fibres and solid particles and sewage In the system, manual, pneumatic, and electric actuators can be worn, which are widely used in process automation systems such as papermaking, mining, chemical industry, and sewage treatment.
Feature of ductile iron knife type gate valve
1. Compact structure, reasonable design, good valve rigidity, smooth passage and small flow resistance coefficient
2. The sealing surface is made of stainless steel and hard alloy, with long service life
3. Using soft graphite packing, reliable sealing, light and flexible operation
Product parameter of DI knife gate valve
Size range: DN50-DN800
Pressure: 1.0 MPa
Operating temperature: max 80℃
Main material: GGG40/ QT400
Operation: Manual
Shell test: 1.5MPa
Seal test: 1.1 MPa
Design and manufacture: JB/T 8691-98
Design and manufacture: JB/T 8691-98
Structure length: GB/T 15188.2-94
Flange connection size: GB/T 9113-2000
Inspection and testing of valves: GB/T 13927-92
Material list of knife gate valve in ductile iron:
| Item No | Part Name | Material |
| 1 | Body | QT400/GGG40 |
| 2 | Seal ring | rubber |
| 3 | Disc | SS |
| 4 | Seal | PTFE |
| 5 | Nut | ZHMn58-2-2 |
| 6 | Handwheel | QT400 |
Size table of DI knife construction gate valve
| MPa | DN | L | D | D1 | D2 | H | N-M | D0 |
| 1 1.0 | 50 | 43 | 160 | 125 | 100 | 4-M16 | 180 | |
| 65 | 46 | 180 | 145 | 120 | 4-M16 | 180 | ||
| 80 | 46 | 195 | 160 | 135 | 4-M16 | 220 | ||
| 100 | 52 | 215 | 180 | 155 | 8-M16 | 220 | ||
| 125 | 56 | 245 | 210 | 185 | 8-M16 | 230 | ||
| 150 | 56 | 280 | 240 | 210 | 8-M20 | 280 | ||
| 200 | 60 | 335 | 295 | 265 | 8-M20 | 360 | ||
| 250 | 68 | 390 | 350 | 320 | 12-M20 | 360 | ||
| 300 | 78 | 440 | 400 | 368 | 12-M20 | 400 | ||
| 350 | 78 | 500 | 460 | 428 | 16-M20 | 400 | ||
| 400 | 102 | 565 | 515 | 482 | 16-M22 | 400 | ||
| 450 | 114 | 615 | 565 | 532 | 20-M22 | 530 | ||
| 500 | 127 | 670 | 620 | 585 | 20-M22 | 530 | ||
| 600 | 154 | 780 | 725 | 685 | 20-M27 | 600 | ||
| 700 | 165 | 895 | 840 | 800 | 24-M27 | 600 | ||
| 800 | 190 | 1010 | 950 | 898 | 24-M30 | 680 |
Widely apply to various kinds of fields
Product Process
