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Gland and Seal for Brake Hydraulics Question

  1. Dec 26, 2012 #1
    I'd like to solicit assistance relative to a brake hydraulic system. I am rebuilding a vintage system that contains a pressure differential unit. The unit contains a dynamic piston with seals in a fixed bore. The seals are intended to keep fluid outboard of them in the bore.
    I have several questions:
    1. The piston gland or seal groove has a tapered bottom (see image), i.e. it is not orthogonal to the groove walls. Is this typical? If so, why?

    The seals--now over 45 years old--appear to be 'square rings' (see image), but early line drawings seem to suggest that they originally had a conical cross-section with the larger diameter--the conical base--facing the fluid. I may be seeing compression set in the ring making them appear to be square rings.

    2. My questions are: Would O-rings be effective in this application? Would a backup ring be appropriate? Is there a source for standard sized conical section rings? Would a square ring be preferred to an O-ring? http://s1342.beta.photobucket.com/user/krausepa/media/oring_zpsdf3c2919.jpg.html?sort=3&o=0

    I'd appreciate any other comments or observations.

    Thanks in advance.

    Attached Files:

  2. jcsd
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