Butterfly valves

Series 56/57 Resilient Seated for Higher Pressures Wafer, Lug

Series 56/57 resilient seated for higher pressures wafer, lug

Wafer, Lug

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

Technical data

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

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