A double offset butterfly valve, also known as DEX valve, is a best working butterfly valve structured to resolves many of the common complaints about standard / concentric butterfly valves. It’s called “double eccentric” because the valve body seat is offset to the front side of the body, and the disc is offset to the front side of the shaft. They are one of the most available eccentric-type butterfly valves in the
market aside from triple-offset ones.
Design and function
Design
● Body of double eccentric butterfly
● Seat
● Seat retainer
● Disc
● Shaft
● Shaft packing
● Operator and
● Bearings
Function
Double eccentric butterfly valves are mainly used in water supply applications below ground as an alternative to gate valves. When installing butterfly valves below ground a lower bury depth is required and typically, they are more cost-effective, especially in the large dimensions, compared to gate valves. They can of course also be used above ground.
Advantages
● Minimal friction: because of its double eccentric design, friction between the valve flap and the valve seat is significantly decreased, therefore extending the service life of the valve.
● Good sealing performance: The double eccentric design ensures that the valve flap has good contact with the valve seat in the closed position, resulting in an efficient seal.
● Compact structure: double eccentric butterfly valves are usually more compact and effortlessly installed than traditional butterfly valves.
Description:-
● Body: Ductile Iron, Cast Iron, Carbon Steel, Stainless Steel
● Disc: Ductile Iron, Cast Iron, Carbon Steel, Stainless Steel
● Nominal Size: DN100 to DN1200
● Nominal Pressure: Class150 to Class600
● End Connections: Flanged
● Operation: Gear Operated, Worm Gear Operated, Electric Actuated,
Pneumatic Actuated
● Class: 150/PN16, PN10, PN25
● Size: 10″, 12″, 14″, 16″, 18″, 20″, 24″, 28″, 32″, 36″, 40″, 48″, 8″
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