| 摘要 |
A safety device for a double-circuit type air brake, wherein compressed air is supplied from one compressor to a pair of air reservoirs, through a check valve in each respective route, featured in inserting a safety device in an upstream portion of the double-circuit brake system, i.e., nearer to the compressor than the check valves. The safety device comprises a differential piston disposed in a housing, which is actuated by the difference of pressure acted on a pair of opposite directionally positioned pressure receiving surfaces on it from each air reservoir, a neutral position retaining spring for constantly retaining the piston neutral, and a first and second cut-out valves which are alternatively closed by the shifting of the differential piston in either direction owing to occurrence of an imbalance of the pressure acted thereon to cut off the air route to one of the air reservoirs to suspend the air supply, when any one of the brake circuits is damaged, to the damaged side air reservoir, in order to maintain the other air reservoir in a normal function.
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