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It consists of a sliding blade which covers and uncovers the duct opening and seals into its frame in the duct. Various modes of sliding/actuation such as manual, rope & pulley, power screw, pneumatic, hydraulic and integral electric actuator are possible in this configuration.
Parallel blades: Adjacent blades rotate in same direction. This type of arrangement is more suitable for flow control in high flow region
Apposed blades: Adjacent blades rotate in opposite direction. This arrangement has a better flow control characteristics (as function of blade position) hence recommended for flow control applications with least disturbances.
Mechwell offers wide range of Butterfly dampers which provides simple and cost effective method of control and isolation in circular ductwork. Various material grades are available depending on temperature and nature of applications and sizes. In addition, appropriate sealing arrangements can be provided to satisfy the sealing efficiency requirements. This sealing efficiency can be further enhanced to 100% with the addition of twin seals and a sealing air fan. Butterfly dampers can be actuated pneumatically, electrically, by reduction gearbox or by using manual lever.