1. Dị ka ọkọlọtọ nke n'ibu ụlọ ọrụ, flange ụdị bụ: efere ụdị flat-welded flange, butt-welded flange, integral flange, butt-welded mgbanaka-efere ụdị rụrụ aka uwe flange, flat-welded mgbanaka-efere ụdị rụrụ aka uwe flange. , flanged mgbanaka-efere ụdị rụrụ aka uwe flange, flange mkpuchi. 2...
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