DelVal Series 56/57
High Pressure Resilient Seated Butterfly Valves
| Body Style | Series 56 – Wafer
Series 57 – Lug |
| Body | CI, DI, CS, SS |
| Disc | Nylon coated Ductile Iron, Aroxy Ductile Iron, CF8M, NAB |
| Stem | 410 SS, 17-4 PH, 316 SS |
| Seat | EPDM, Buna-N, FKM |
| Size Range | 2″ to 48“ (DN 50 to 1200) |
| Pressure Rating | 2″ to 24″ – 285 PSIG (PN 20)
26″ to 48″ – 230 PSIG (PN 16) |
| Design Standard | API 609, BS EN 593 |
| Testing Standard | API 598, BS EN 12266-1 |
FEATURES
- ISO 5211 top plate for direct mounting of a wide range of actuators, handles, and gears
- High strength disc with polished edge and hubs
- Upper and lower stem with Square or double-D drive eliminates the need for disc screws or taper pins
- Double molded O-rings provide upper and lower secondary seals
- Heavy duty bushing absorbs forces acting on disc-stem assembly due to line pressure
- “Bear-G” bearings on drive and non-drive end stem reduce friction and isolate stem from valve body
- Bi-directional U-cup stem seal
