Double Offset Wafer Butterfly Valve Triple Eccentric Metal Seated
The triple eccentric butterfly valve, which makes use of a metal
seat, is, therefore, able to withstand a greater amount of
pressure, compared to a resilient seated butterfly valve. The seal
of the eccentric disc could be either metal/Graphite multi-layer
design or fully metal-to-metal design. The multi-layer design could
achieve zero leakage and simple maintenance, while the
metal-to-metal design is more reliable in higher temperature and
pressure. Basically speaking, the triple eccentric butterfly valve
is both applied in shutoff or throttling service.
Wafer type is the common style of a butterfly valve and is less
expensive than the lug type. The wafer butterfly valve is installed
between two flanges. The valve is kept in place by using bolts or
studs and nuts from flange to flange. This type of installation, of
course, makes it impossible to disconnect just one side of the
piping system from the valve.
Features of Wafer Triple Eccentric Butterfly Valves:
Eccentric Disc Design
Multi-layer Disc Seal Standard
Fully Meal-to metal Seal Optional
Uni-directional Flow
Wafer Body Type, Lug Type or Flanged Type
Applicable Standards of Wafer Triple Eccentric Butterfly Valve:
a) Design & Manufacture: API 609, EN 593, MSS SP-68
b) Face to Face Dimension: API 609, EN 558
c) End Connection: ASME B16.5, EN 1092, JIS B2220
d) Test and Inspection: API 598, EN 12266
