| 摘要 |
<p>A flame arrester 2 comprises a tubular housing 4 for connection in a vacuum line and a flame arrester element 8 which is movable between a first, flame arrest position within the tubular housing 4 and a second position retracted from the tubular housing 4. Means 12 is provided for moving the flame arrester element 8 from the first to the second retracted position when the pressure/vacuum in the tubular housing 4 falls below a predetermined value. <IMAGE></p> |
