Pilot valve
Encyclopedia : P : PI : PIL : Pilot valve
A Pilot valve is a dead man's switch which requires a human operator to hold it in the mid-position and take some action if the operator takes off pressure or applies full pressure. Often (especially in heavy rail applications) this type of fail-safe braking is provided with one foot and one hand control to reduce driver fatigue by giving them the option to switch between the two.
See also
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