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  1. jabsab

    Valve Stem Friction

    I can be reached at brown_ja@nns.com
  2. jabsab

    Valve Stem Friction

    The valve is just a 10" 300lb. manually operated rising stem gate valve. I agree the largest contributor to stem friction is packing, but I'm looking for a way to reduce the operating nut friction without changing too much existing design (maybe PTFE thrust washers).
  3. jabsab

    Valve Stem Friction

    I'm trying to calculate opening/shutting torque values for a rising stem gate valve. The problem is that I can't find coefficients of friction for a monel operating nut on a bronze wear surface. Anyone have ideas for values or references?
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