Patent ID: 6415772
Filing Date: 2002-07-09
Classification: B60K,F02M

Abstract:
An evaporative emission control system, comprising:a differential pressure valve that controls fluid communication between a canister and a fuel tank, said differential pressure valve comprising a first chamber, a second chamber, a diaphragm separating said first chamber and second chamber from each other, and a valve seat that faces the diaphragm, said differential pressure valve being placed in a selected one of an open state in which the diaphragm is spaced apart from the valve seat, and a closed state in which the diaphragm rests on the valve seat, said diaphragm having a communicating hole defined therein; and a closure member positioned and configured to close the communicating hole of the diaphragm when the differential pressure valve is placed in the closed state, said-communicating hole communicating the first and second chambers with each other when the differential pressure valve is placed in the open state.