APPARATUS AND METHODS TO DISPENSE FLUID FROM A BANK OF CONTAINERS AND TO REFILL SAME

摘要

A dual check valve device has a housing, a first check valve in the housing
and a second check valve
located in the housing adjacent the first check valve. The dual check valve is
suitable for use in a cascade
system includes a manifold having a fluid outlet port to dispense fluid and a
fluid valve engaged to the
manifold. First and second fluid storage containers are coupled to the
manifold. The fluid valve is
configured to control a first fluid flow path between the second fluid storage
container and the fluid outlet
port.