| 摘要 |
A port control member is depressed by either a mechanical force applied on it by the pilot, for moving it to meter pressure and flow from a supply pressure to the wheel brakes, or a hydraulic pressure force applied following take-off, to actuate the brakes for stopping the wheels from spinning. The valve housing defines an annular pressure chamber surrounding a portion of the port control member. The port control member includes a feedback passageway between the pressure chamber and a feedback chamber formed between the inner end of the port control member and the valve housing. The port control member is also surrounded by a sleeve which has an inner surface extending radially outwardly from the inner end of the port control member. The feedback passageway, which can include a damping orifice, produces a feedback force to the pilot which is increased when the sleeve is jammed with respect to the port control member.
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