Pulsar L4-1809cc 1.8L DOHC (CA18DE) (1988)
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.