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DDI guillotine blades are flat
within one half of the blade thickness when hung vertically, providing low
residual stresses.
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Thermal expansion slots in the
blade prevent blade distortion.
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A seismic cap stabilizes the
outer edge of the blade plate in all positions.
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The blade is totally withdrawn
from the seal air chamber in the open position to minimize heat loss.
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DDI engineered chain drive
systems have been in service for over fifteen years.
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DDI's preferred nine tooth
sprocket limits sprocket induced blade velocity variations to plus or minus
3%.
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Standard DDI drives will start
at 80% of rated voltage.
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Drive can be started from any
position without by-passing the torque switch.
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Each drive has a failure
strength two times that required to stall the actuator.
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A suddenly applied stall load
will not cause catastrophic failure.
