Abstract: A line or directional valve of the type that is adapted for use in fire extinguishing systems of the gas dissemination type is provided, employing a moveable piston adapted to be unseated from a valve seat, upon delivery of fluid for opening thereof, wherein the forces of the valve piston against the valve seat are reduced and controlled by utilizing inlet fluid pressure that is operative against the piston in such a way as to reduce the forces from inlet fluid pressure on the piston to a desired net or resultant force. A vent is also provided for facilitating keeping the piston open after its initial opening.

Abstract: A fire extinguishing system that is of the gas dispersion type is provided, whereby a given supply cylinder, controlled by a cylinder valve, is piped to a plurality of directional or line valves for delivery to various locations. Sensing devices are also provided for controlling the line valves and cylinder valves as are manual valve operators. A particularly novel cylinder valve is provided, whereby once the valve is opened, venting of one side of the piston prevents closing prior to discharge of fluid from the cylinder.

Abstract: A fire extinguishing system that is of the gas dispersion type is provided, whereby a given supply cylinder, controlled by a cylinder valve, is piped to a plurality of directional or line valves for delivery to various locations. Sensing devices are also provided for controlling the line valves and cylinder valves as are manual valve operators. A particularly novel cylinder valve is provided, whereby once the valve is opened, venting of one side of the piston prevents closing prior to discharge of fluid from the cylinder.