The structural characteristics of concentric flange butterfly valves are that the stem axis, butterfly plate center and valve body center are in the same position. In general, in principle, can use the concentric butterfly valve will try to use the concentric butterfly valve. Because the concentric butterfly valve is not high requirements for sealing either structurally or operationally, it is a conventional product. In order to overcome the extrusion, scraping, to ensure sealing performance, concentric butterfly valve seat basically using rubber or PTFE and other elastic materials, is a soft seal butterfly valve. This makes the concentric butterfly valve in the use of temperature restrictions.
Concentric Flanged Butterfly Valve Specification
| Material | Ductile iron |
| Design | API609-2004 |
| Body | ASTM A536 65-45-12 |
| Disc | ASTM A536 65-45-12 |
| Stem | SS420/316 |
| Seat | EPDM,NBR,FRM, PTFE |
| Pin | SS304/ 316 |
| Nuts | Stainless steel |
| Class | PN16/PN10 |
| Screw | SS304 |
| Retainer | Nylon for DN50-DN300,SS304 for DN350-DN1200 |
| Bearing | PTFE with Graphite |
| Temperature | -20℃ to +140℃ |
| Pressure Rating | PN16 |
| Size | DN40 - DN1200 |
| Drive versions | Hand lever, gear box, pneumatic actuator, electric actuator |
Concentric Flanged Butterfly Valve
Concentric Flanged Butterfly Valve material list
| Part | Material | EN Spec. |
| Body | Ductile Iron | EN-JS 1050 |
| Disc | Ductile Iron | EN-JS 1050 |
| Bronze | EN1982 CC491K | |
| Stainless Steel | BS970 304 C15 | |
| Stainless Steel | BS970 316 C16 | |
| Shaft | Stainless Steel | BS970 410 S21 |
| Stainless Steel | BS970 431 S29 | |
| Seat Ring | EPDM /NBR /Viton /PTFE | |
| O-Ring | EPDM/NBR | |
| Bushing | Bronze | EN1982 CC491K |
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