| 摘要 |
Time delay valve means are provided in a conduit through which an actuating vacuum signal is supplied to a valve for controlling the recirculation of exhaust gases in an internal combustion engine. The time delay valve means include a pressure responsive vacuum relay valve for opening and closing the conduit in response to an increase in engine intake manifold vacuum to a predetermined level and an orifice for increasing the time required after engine starting for the predetermined level of intake manifold vacuum to be applied to the vacuum relay valve.
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