Sentra Hatchback Coupe L4-1597cc 1.6L SOHC (E16i) (1987)
Vacuum Delay Valve: Description and Operation
Fig. 16 Vacuum delay valve (typical)
This valve, Fig. 16, prevents a rapid vacuum drop of the EGR control line. The valve is designed for one-way operation and consists of a one-way
umbrella valve and a sintered steel fluidic restricter.