| 摘要 |
An inversion valve for use in a vehicle air brake system includes a valve member which maintains communication between a source of pressure and an air brake as long as pressure is maintained in both primary and secondary air systems. If the primary air system should suffer a reduction in pressure, the valve member closes communication between the tank and the air brake and opens an exhaust port to exhaust the air pressure in the brake, thereby causing the brake to operate.
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