January 01, 1970
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Outer ring grooving machine design for making groove of outer ring of spiral wound gasket, controlled by air pump. No longer expensive lathes need; one worker can see after more then 10 machines in same time.
Steel-lined plastic composite pipe is a kind of high-performance anti-corrosion pipeline developed in recent years, and its structure is divided into internal and external layers.
Bolts with temperatures above 150 ° C require advanced disc spring pretensioning technology. It is recommended to use this series as much as possible at operating temperatures below 300 or around and corrosive media
