System Impulse Response Identification Using a Multiresolution Neural Network

A pressure-vacuum cap for a chamber having a filler neck, the cap comprising a housing proportioned and designed to engage and close the filler neck. The housing provides a passageway extending axially therethrough in communication with the filler neck and, intermediate the ends of the passageway, a concentric annular outwardly facing seat and a concentric annular inwardly facing seat. A gasket closes the passageway, the gasket having an outer peripheral portion in sealing engagement with one of said seats and an inner peripheral portion in sealing engagement with the other of said seats. Springs yieldably urge the gasket into sealing engagement with the seats. The springs are calibrated such that the gasket serves as a two-way valve for normalizing the pressure in such a chamber, venting the chamber to atmosphere when the pressure in the chamber exceeds a predetermined superatmospheric level and when the pressure in the chamber drops below a predetermined subatmospheric level.

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