GB1406359A - Fire extinghuishing apparatus - Google Patents

Abstract

1406359 Fire-fighting system CHUBB FIRE SECURITY LTD 29 Jan 1974 [7 Feb 1973] 6060/73 Heading A5A A combined fire detection and extinguishing system comprises a container 1 of extinguishing fluid e.g. B.C.F. under vapour or gas pressure, a heat destructable detector tube 3, preferably of nylon, with one closed end and the other end connected through a bleed passage 22, 23 to the container 1 to enable it to be subjected to a pressure at least as great as that in the. container, a discharge tube 4 with extinguishing fluid outlets 5 connected to the container via a pressure control valve 2, a control member of which is subjected to the pressure in the detector tube 3 and arranged so that while the pressure in tube 3 is maintained the valve is closed 'but on loss of that pressure due to rupture of tube 3 by heat the valve opens and allows fluid to enter the discharge tube. In use the apparatus is activated by connecting a source of inert gas to valve 33 and pressurising till the pressure in chamber 31 equals that in container 1. Plunger 25 is then raised by unscrewing and removing screw 28 where nylon disc 24 sits on the top of boss 17 arranged on diaphragm 16. On pressure loss in detector tube 3 attached to union 32, gas bleeds through passages 22, 23, lifts disc 24 and blocks passage 23, and causes unequal pressure between chamber 31 and container 1 which results in an upward movement of diaphragm 16 so unseating valve seat 20. Fluid now passes from container 1 through union 12 to line 4. In a second embodiment (Fig 3, not shown) the diaphragm is replaced by a shiny-bonded piston 43 whose base carries a valve closure member 42, the bleed passages being 61 and 58, the former containing a closure member 63.