Patent ID: 7426935
Filing Date: 2008-09-23
Classification: F17C,Y02E,Y10T

Abstract:
1. A master/slave tank system comprising: a master tank for storing a gas; at least one slave tank for storing the gas; a first line coupled to the master tank for providing the gas stored within the master tank to a gas-using device; at least one pressure regulator positioned in the first line between the master tank and the gas-using device; a master tank shut-off valve positioned in the first line between the master tank and the at least one pressure regulator; a second line for providing the gas stored within the at least one slave tank to the master tank, wherein the at least one slave tank provides the gas to the master tank on the second line as the pressure difference between the slave tank and the master tank changes when the gas is output from the master tank on the first line; and an electrically driven solenoid slave tank shut-off valve positioned within the second line, wherein a differential pressure across the slave tank shut-off valve is relatively low, said slave tank shut-off valve automatically closing the at least one slave tank in response to an increased differential pressure across the slave tank shut-off valve that overcomes an electrical signal applied to the valve.