Gate Valve Stem / Threads Lubrication

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by Provincial, Apr 24, 2021.

  1. Provincial

    Provincial New Member

    Joined:
    Mar 7, 2010
    Location:
    Ontario, Canada
    I have numerous gate valves in my home.
    For example, the water cut-offs for outdoors, and even the master water cut-off are all gate valves.

    Am I supposed to be doing something to properly maintain or lubricate those valves?
    Should I put WD40 on the stem, or perhaps spreading on some plumbing silicone?

    The question occurred to me because it's about time to again turn on the cut-off valves for the outside water, and I would prefer to keep those in good condition rather than seeing some failure one day.
     
  2. Sylvan

    Sylvan Still learning

    Joined:
    Sep 23, 2004
    Occupation:
    plumbing - fire suppression - boiler inspector
    Location:
    New York
    On OS & Y valves we use key grease on the spline (Stem) and close and open the valves and make sure we give the gate valves a 1/4 turn back from closed
     
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  4. DIYorBust

    DIYorBust Active Member

    Joined:
    Mar 5, 2019
    Location:
    Long Island, New York
    Had one break off on my last year. Man was that a pain, I didn't have a ball valve one hand the right size, and it was in a point I couldn't easily drain. Truly, is greasing the valve less work than replacing it? Probably yes, but not by a ton.
     
  5. Reach4

    Reach4 Well-Known Member

    Joined:
    Sep 25, 2013
    Location:
    IL
    Why do you think they are gate valves? Most multi-turn valves in houses are not gate valves.
     
  6. hj

    hj Master Plumber

    Joined:
    Aug 31, 2004
    Occupation:
    Plumber
    Location:
    Cave Creek, Arizona
    That would usually only be true if you also counted all the shut off valves at the fixtures. The ONLY way to lubricate a gate valve stem, NOT an OS&Y one, it to take it apart. Spraying lube on the exposed portion is useless.
     
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  7. Sylvan

    Sylvan Still learning

    Joined:
    Sep 23, 2004
    Occupation:
    plumbing - fire suppression - boiler inspector
    Location:
    New York
    Actually, most fixture valves are Globe pattern for throttling.

    For example, a Fluidmaster 400A can cause a hydraulic shock like a washing machine, dishwasher, or any other type of quick closing valve, solenoid valve for example

    Gate and ball valves are not for throttling


    Gate valves are considered a positive shut off
     
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