| 摘要 |
Safety device for pneumatic braking cylinders (10) for railway and tramway vehicles, particularly for underground trains, having a service-brake section (10a) connected to the pneumatic line and a parking-brake section (10b) connected to a pressurised air supply (12) and operable to ensure the vehicle remains stationary. The device includes a cut-off valve (20) interposed between the pressurised air supply (12) and the parking-break section (10b) of the cylinder (10) and arranged to break their communication, exhaust the said section, and then enable its operation, in such a manner as to avoid any untimely operation tending to cause undue braking of the vehicle in service. |
