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Re: seat;---3 way grind? and other questions
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Posted by Janicholson on January 23, 2007 at 06:25:39 from (199.17.6.122):
In Reply to: seat;---3 way grind? and other questions posted by shoo_giesty on January 23, 2007 at 05:36:39:
Rusty is correct. The seat angle should be set to one degree more than the valve face angle. This results in the first line of contact being at the perimeter of the seat. This provide a ring contact resulting in an immediate seal at that point. The point of contact on the valve face should be near the outer 1/5th of the face, but not at the edge. the last grind should be the top cut on the seat. All valves should have a margin (edge thickness) of at least .050" this reduces the temperature and prevents early overheating. JimN
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