Method for drilling holes in a substrate, in particular an...

Details Method for drilling holes in a substrate, in particular an... Method for drilling holes in a substrate, in particular an...

2011-03-01

2011-03-01

Hoang, Tu B (Department: 3742)

Electric heating

Metal heating

By arc

C219S121690, C219S121790

Reexamination Certificate

active

07897893

ABSTRACT:
Disclosed is a valve having a housing with a valve seat for a two-piece flap which is rotatably mounted on a drive shaft. An annular piston seal and an adjacent cover disk are disposed between the first part and the second part of the two-piece flap so as to revolve therearound. The diameter of the cover disk is smaller than the diameter of the annular piston seal which is embodied as a metal ring that is provided with a gap. The invention also relates to the use of the valve as a gas recirculation valve.

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“Trepanning Moves in on mini holes”, Machinery and production engineering, Machinery publishing Co. Ltd., Burgess Hill, GB, Nov. 1983, Seiten 42,43,XP0019471, ISSN: 0024-919X, Seite 42, Abs. 7-Seite 43, Absatz 3.

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