The valve does not require a separate valve stem packing seal structure. The diaphragm plays a role of sealing the valve stem while cutting off the medium. The second is that the flexible diaphragm can be closed reliably, and even the dirty liquid can be cut off well.
Main material
| NO. | Name | Material |
| 1 | Body | Cast iron, carbon steel, stainless steel |
| 2 | Bonnel | Cast iron, carbon steel, stainless steel |
| 3 | Lining | Lining with rubber or fluorine |
| 4 | Diaphragm | F46＋EPDM, Rubber |
| 5 | Disc | Cast iron, carbon stee |
| 6 | Cylinder | Aluminum alloy |
| 7 | Pislon | Aluminum alloy |
| 8 | Stem | Stainless steel304/45# |
| 9 | Way of connection | Flange |
Shape control table
| DN | L | D | D1 | n-φd | 1 | H | φA |
| 150 | 460/406 | 285 | 240 | 8—22 | 3 | 830 | 370 |
| 200 | 570/521 | 340 | 295 | 8—22 | 4 | 880 | 490 |
