Figure 4A shows the position of parts on pressure-operated cylinders ready to operate.Figure 4B shows the parts during operation.The pressure causes the piston to depress thereforeventing the upper cavity in the valve. Once vented, themain seat opens automatically.Figure 4A shows a typical multiple cylinder assemblyshowing the manner in which the two control cylindersare manifolded to the other cylinders in the system.Note that Halon 1301 flows from the discharge flexibleloop to the pressure-operated control head.Structural steel framing or racks are supplied with eachsystem for supporting the cylinders and manifold.DIRECTIONAL VALVE SYSTEMIn some instances it may be necessary to protect morethan one hazard with the same bank of cylinders. Inthese cases, pressure-operated stop valves are used toroute the Halon 1301 to whichever space in which a fireoccurs. These valves are available to complement thecylinders' releasing equipment in order to permitflexibility of installation.When a fire occurs in one of the compartments with adirectional valve system, the detecting equipment via acontrol panel performs the following functions:1.Opens the proper directional valve2.Releases the Halon 1301 cylinders6
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