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The blade is totally withdrawn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