Abstract: An amplifier uses non-dissipative elements to provide current and voltage feedback. The base amplifier has two input terminals, and the current and voltage feedback signals are applied to respective input terminals. The non-dissipative elements may be either transformers or coupled-line pairs. These elements allow broad band operation with low noise. The feedback configuration results in higher input impedence.

Abstract: A pressure stabilizer device designed to be placed on the vent line of underground gasoline storage tanks in a service station. The pressure stabilizer is designed to allow inbreathing in the event a vacuum develops in the underground storage system or outbreathing in the event the pressure becomes too great. The stabilizer has an open aperture of a predetermined size to allow a given amount of inbreathing or outbreathing. The stabilizer also includes a gravity operated valve arrangement which opens in response to a given high pressure within the underground storage system to increase the aperture size of the stabilizer and allow a pressure release.

Abstract: A safety arrangement for a gasoline dispensing station equipped with a vapor recovery system. Gasoline vapors displaced from a motor vehicle fuel tank during filling are collected through the dispensing nozzle, and are directed first through a flexible hose attached to the nozzle and then through a pipe to an underground storage system. A preferred embodiment of a break-away valve is placed in the pipe near where it enters the ground such that in the event of an accident, as by an automobile running over the gasoline dispensing console, the break-away valve will automatically close to shut off the vapor recovery system. This minimizes the danger of an explosion or fire possibly caused by an open vapor recovery system.

Abstract: A safety arrangement for a gasoline dispensing station equipped with a vapor recovery system. Gasoline vapors displaced from a motor vehicle fuel tank during filling are collected through the dispensing nozzle, and are directed first through a flexible hose attached to the nozzle and then through a pipe to an underground storage system. A break-away valve is placed in the pipe near where it enters the ground such that in the event of an accident, as by an automobile running over the gasoline dispensing console, the break-away valve will automatically close to shut off the vapor recovery system. This minimizes the danger of an explosion or fire possibly caused by an open vapor recovery system.

Abstract: A float valve for use in the vapor return lines of a vapor recovery system for liquid hydrocarbon storage facilities is disclosed. This valve is designed to prevent vapors from flowing against the float and to quickly close when the liquid level reaches the float.