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Ventilating duct control flap - consists of two circular plates with wire ring behind sealing strip in gap between them
Ventilating duct control flap - consists of two circular plates with wire ring behind sealing strip in gap between them
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机译:通风管道控制风门-由两个圆形板组成,在密封条后方的间隙中有钢丝圈
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摘要
The circular ventilating flap which is rotated about an axis inside a pipeline, is made of two sheets which are joined together at a central zone by e.g. screws or welds. Both sheets are circular, and one sheet has its peripheral edge offset, connected by a flange at right angles, to form a gap against the other sheet. Into this gap is fitted a sealing ring made of a soft material such as felt, and partly projecting from it. Housed in the remaining space under this sealing ring is a loop of wire enclosed by a plastics tube.
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