蝶形止回阀主要适用于城市、工业及高层建筑给水、排水管网上。由于其结构长度比一般止回阀短，对有安装空间限制的场所最为适用。
Technical Data
| Size | DN40-DN800 |
| Working Pressure | PN10/PN16 |
| Face to Face | DIN3202-K3 |
| Flange Drilling | ANSI B16.1 Class 125,EN1092-PN10/PN16 * |
| Inspection and Test | API598 |
All available Flange drilling kindly refer to the attached Flange Drilling Dimensions.
Product Features
Wafer body style fits between FF or RF flanges.
Upper and lower PTFE thrust washers
Resilient Buna-N or EPDM seat.
Dual Plate Valves give maximum strength with minimum opening time.
Torsion springs assist valve closure, preventing flow reversal .
Thrust washers reduce friction and wear of valve plate hinges.
Material of Construction
| Parts | Description | Material | Specification |
| 1 | Body | Cast Iron | A126巳 |
| 2 | Disc | Stainless Steel | A351 CF8M |
| 3 | Stem | Stainless Steel | A351 CF8M |
| 4 | Seat | EPDM | |
| 5 | Spring | Stainless Steel | AISI 316 |
| 6 | Washer | PTFE | |
| 7 | Hex Nut | Cast Steel | A194 2H |
* Other material request kindly refer to Bill of MainMaterials of Hank.
Dimensions
| SIZE | L | D | D1 | D2 | ||
| DN | NPS | PN10 | PN16 | |||
| 40 | 1.5" | 43 | 78 | 78 | 57 | 38 |
| 50 | 2" | 43 | 107 | 107 | 65 | 46 |
| 65 | 2.5" | 46 | 127 | 127 | 80 | 60 |
| 80 | 3" | 64 | 142 | 142 | 94 | 70 |
| 100 | 4" | 64 | 162 | 162 | 117 | 88 |
| 125 | 5" | 70 | 192 | 192 | 145 | 115 |
| 150 | 6" | 76 | 218 | 218 | 170 | 134 |
| 200 | 8" | 89 | 273 | 273 | 224 | 184 |
| 250 | 10" | 114 | 328 | 328 | 265 | 220 |
| 300 | 12" | 114 | 378 | 378 | 310 | 260 |
| 350 | 14" | 127 | 438 | 444 | 360 | 298 |
| 400 | 16" | 140 | 489 | 489 | 410 | 350 |
| 450 | 18" | 152 | 539 | 555 | 450 | 385 |
| 500 | 20" | 152 | 594 | 617 | 505 | 438 |
| 600 | 24" | 178 | 695 | 734 | 624 | 538 |
| 700 | 28" | 229 | 810 | 804 | 720 | 640 |
| 800 | 32" | 241 | 917 | 911 | 825 | 734 |
