Valve Unit ADD
The valve unit ADD (automatic dropping device) is used for monitoring the sliding
strips to minimize damage of catenary and pantograph due to damaged sliding strips.
If a sliding strip is damaged, a control pipe is opened and compressed air is
releasing. The exhaust valve is opened due to the decrease in pressure, the air
bellow is ventilated and the pantograph lowers immediately.
Illustration 6: Valve unit ADD
All components of the Valve Unit ADD are listed in the Spare Parts – List
( Chapter #17.2.12).
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