司軔閥隔離旋塞

司軔閥隔離旋塞是多數鐵路動力車輛 上配有的一個閥門，用於將其中之貫通司軔閥 隔絕於列車的氣軔系統之外。它通常位於車輛駕駛室 內的司軔閥下方。

The brake cutout valves are there to ensure that, in a train with many motorized vehicles, only one train brake control device is enabled. If there were multiple, conflicts would occur, potentially resulting in dysfunctional brakes and a disaster.

When the train brake is cut out on a vehicle, its control device is no longer functional. However, the vehicle is still able to brake, as controlled by another vehicle's train brake.

司軔閥隔離旋塞僅限制貫通制軔方式作用，因此單獨制軔 等制軔方式仍有作用。