| 摘要 |
A valve for a motor vehicle power steering gear including a tubular valve body having a plurality of internal lands, a valve spool rotatable inside of the valve body having a plurality of external lands, and a plurality of metering flats on the external lands which cooperate with linear edges of the internal lands in defining a pair of series connected metering orifices in a fluid flow path through the rotary valve from a pump to a reservoir. When the series connected metering orifices are fully closed, the effective circumferential overlap between the internal and external lands which prevents leakage from the pump to the reservoir is the sum of the circumferential overlaps at the individual metering orifices.
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