| 摘要 |
<p>An automatic fire damper device comprising a pipe section in which a flap valve is held adjacent the pipe wall in the inactive position by a spot of melting metal at its lower end and by a tensioned flat spring at its upper end. Hot fire gases in the pipe melt the metal allowing the spring to swing the valve flap upwards in the pipe so that its bottom edge engages the opposite pipe wall, blocking the pipe flow area. For a circular pipe, the flap is curved and oval-shaped in projection.</p> |
