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.
|Equipment||manual hand pump||electrically propelled small hydraulic power unit||Hydrogerät mit manuellelectrically propelled small hydraulic power unit in connection with hand pumper Handpumpe|
|Assembly position||vertical or horizontal||vertical (preferred) or horizontal||vertical (preferred) or horizontal|
|Assembly location||car body (drivers cab)||bogies||car body|
|Application||manual release of s.a.c. per car or per bogie||electrical release of s.a.c. per bogie||manual or electrical release of s.a.c. per car|
|Function||manual op. release, manual op. braking, electric op. braking||electric op. release, manual op. braking||manual op. release, electrc op. release, manual op. braking, electric op. braking|