Dual-metal molecularly bonded plug assembly for...

Details Dual-metal molecularly bonded plug assembly for... Dual-metal molecularly bonded plug assembly for...

B - Operations, Transporting

22

D

B22D 19/00 (2006.01) B22D 19/06 (2006.01) F16K 5/04 (2006.01) F16K 27/06 (2006.01)

Patent

CA 2385773

A plug assembly for plug valves is made of two distinct metals, one for the plug and another for the stem or trunnion. In a preferred embodiment, the plug is made of ductile iron and the stem or trunnion is made of high grade stainless steel. The two metals are molecularly bonded at their respective surfaces when molten iron is cast into a plug mold containing the steel stem. A mechanical bond is also provided in the form of a iron pin through an aperture in the stainless steel stem.

L'invention concerne un ensemble de tournant destiné à des robinets à tournant composés de deux matériaux distincts, l'un étant utilisé pour le tournant et l'autre pour la tige ou le pivot. Selon un mode de réalisation préféré, le tournant est composé de fer ductile et la tige ou le pivot est composé d'acier inoxydable à teneur élevée. Les deux métaux sont liés moléculairement au niveau de leurs surfaces respectives au moment où le fer fondu est coulé dans un moule à tournant contenant la tige d'acier. Une liaison mécanique est également fournie sous forme d'une tige de fer traversant une ouverture de la tige d'acier inoxydable.

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