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Auxiliary release devices can build up pressure independently of the service release circuit.
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Manual hand pump
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Small-power range hydraulic power unit installed.

Auxiliary release devices

When Nothing Moves

Spring-applied actuators brake the vehicle after an energy failure thus providing an indispensable safety instrument. After braking, however, there is a slight technical problem: the vehicle cannot be moved unless there is hydraulic pressure in the service release circuit. HANNING & KAHL has designed auxiliary release devices for this particular application. These devices can build up pressure in the actuator's second hydraulic circuit independently of the service release circuit. The brake can be released with this pressure allowing the ve hicle to be moved again. An auxiliary re - lease de vi ce can be deployed to release all the brakes on a tram or just the brakes of a particular bogie dep end ing on the vehicle design.

Technical Data

type HP HZY NL HZY NL/HP
equipment stationary hand pump electrically propelled small hydraulic power unit electrically propelled hydraulic power unit in connection with hand pump
mech. design frame type compact compact
mounting location car body (driver’s cab) bogie car body
application manual release per car or per bogie electrical release per bogie manual or electronic release per car
functions manual op. release, manual op. braking, electronic. op. braking electric. op. release, electric. op. braking manual op. release, electric. op. release, manual op. braking, electric. op. braking