| 摘要 |
A safety system for hydraulic brakes in a train brake system wherein a spring biased spool valve controls delivery from a hydraulic fluid source to at least two sets of spring applied hydraulic brake actuators and wherein said spool valve is also biased by the fluid pressure delivered to said two sets of brake actuators and upon a rupture in a brake line delivering fluid to one brake actuator, which causes a lowering of a fluid pressure force on the spool valve, causes the spool valve to shut off the delivery of fluid to the ruptured line to allow the spring applied hydraulic brake actuator to engage the applied brake.
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