A system for storing a fire extinguishing agent, the system comprising: a fire extinguishing tank configured to store fire extinguishing agent , the fire extinguishing tank having an orifice ; and a valve located in the orifice configured to regulate pressure of the fire extinguishing agent exiting the fire extinguishing tank when the valve is opened; wherein the fire extinguishing agent comprises halocarbon, and wherein the valve further comprises: a valve housing ; a valve inlet fluidly connecting the valve housing to the fire extinguishing tank; a valve outlet in the housing; and a piston within the valve housing, the piston dividing the valve housing into a first chamber and a second chamber , the second chamber fluidly connecting the valve inlet to the valve outlet when the valve is opened; wherein the piston is configured to move within the valve housing and adjust the flow of the fire extinguishing agent through the second chamber; wherein the valve outlet is fluidly connected to the first chamber, and characterized in that the piston is configured to move when pressure at the valve outlet exceeds a selected outlet pressure; the piston further includes a first side proximate the first chamber and a second side proximate the second chamber; and the first side includes a first surface area and the second side includes a second surface area, the first surface area being greater than the second surface area. a fire extinguishing tank configured to store fire extinguishing agent , the fire extinguishing tank having an orifice ; and a valve located in the orifice configured to regulate pressure of the fire extinguishing agent exiting the fire extinguishing tank when the valve is opened; wherein the fire extinguishing agent comprises halocarbon, and wherein the valve further comprises: a valve housing ; a valve inlet fluidly connecting the valve housing to the fire extinguishing tank; a valve outlet in the housing; and a piston within the valve housing, the piston dividing the valve housing into a first chamber and a second chamber , the second chamber fluidly connecting the valve inlet to the valve outlet when the valve is opened; wherein the piston is configured to move within the valve housing and adjust the flow of the fire extinguishing agent through the second chamber; wherein the valve outlet is fluidly connected to the first chamber, and characterized in that the piston is configured to move when pressure at the valve outlet exceeds a selected outlet pressure; the piston further includes a first side proximate the first chamber and a second side proximate the second chamber; and the first side includes a first surface area and the second side includes a second surface area, the first surface area being greater than the second surface area. a valve housing ; a valve inlet fluidly connecting the valve housing to the fire extinguishing tank; a valve outlet in the housing; and a piston within the valve housing, the piston dividing the valve housing into a first chamber and a second chamber , the second chamber fluidly connecting the valve inlet to the valve outlet when the valve is opened; wherein the piston is configured to move within the valve housing and adjust the flow of the fire extinguishing agent through the second chamber; wherein the valve outlet is fluidly connected to the first chamber, and characterized in that the piston is configured to move when pressure at the valve outlet exceeds a selected outlet pressure; the piston further includes a first side proximate the first chamber and a second side proximate the second chamber; and the first side includes a first surface area and the second side includes a second surface area, the first surface area being greater than the second surface area. <EOS>