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Thread: Tolerance for Valve seat

  1. #1
    Associate Engineer
    Join Date
    Oct 2014
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    1

    Tolerance for Valve seat

    Hi,
    Im new to GD&T and getting to grips with the usage and understanding. So I was going through this link

    QUALITY CRITERIA Brochure ENGLISH.pdf.


    Here (page 14) it says valve seat is controlled using circularity and concentricity. Why not use total runout ?

    Thanks and Regards,
    Blue_V
    Last edited by Kelly Bramble; 10-08-2014 at 05:55 AM. Reason: Attach file directly

  2. #2
    Administrator Kelly Bramble's Avatar
    Join Date
    Feb 2011
    Location
    Bold Springs, GA
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    2,237
    Quote Originally Posted by Blue_V View Post
    Here (page 14) it says valve seat is controlled using circularity and concentricity. Why not use total runout ?
    Good question! I think the geometric definition required would depend on whether or not the valve stem restrains the relative position of the valve. Should the valve stem not restrain the relative position on the valves against the valve seat then the only requirement would be the cylindricity and circularity match that of the valve sealing seat.

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