Water Hammer Arrester - Must be Vertical?

Discussion in 'Plumbing Forum, Professional & DIY Advice, Tips & ' started by larrymcg, Sep 28, 2010.

  1. larrymcg

    larrymcg New Member

    Messages:
    25
    Location:
    Silicon Valley
    I'm guessing this is a silly question, but..... Does the tube of a water arrester have to be vertical?

    Since the arrester tube has a piston that separates the water from the contained gas, I thought there could be a chance that the tube could be horizontal.

    I want to put arresters on the hot and cold lines to the clothes washer but the current flexible lines connect to shut-off valves with outlets that go straight down. So connecting something like the Sioux Chief Min-Restor at the shut-off valves would have the tube in the horizontal direction.

    --Larry
  2. Terry

    Terry Administrator Staff Member

    Messages:
    14,911
    Location:
    Bothell, Washington
    They can be horizontal.
    However, you can also mount them on the washer and keep them vertical is you want.
  3. larrymcg

    larrymcg New Member

    Messages:
    25
    Location:
    Silicon Valley
    I wonder why I didn't think of mounting them on the washer? The connections on the washer are above each other so I could mount the top arrester vertically and the bottom one at a slight angle to miss the top one!

    Thanks,
    Larry
  4. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Messages:
    21,922
    Location:
    New England
    Ideally, the arrester is installed as close to the quick-acting valve as possible...and, with an engineered on, orientation is irrelelvant.
  5. hj

    hj Moderator & Master Plumber Staff Member

    Messages:
    26,515
    Location:
    Cave Creek, Arizona
    Point the top one up and the lower one down. They will work effectively in either direction.
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