Expansion Chambers

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by newmex999, Mar 25, 2010.

  1. newmex999

    newmex999 New Member

    Dec 22, 2009
    I am installing a new shower valve. Should I install expansion chambers on the hot and cold 1/2 copper water lines near the valve?
  2. jadnashua

    jadnashua Retired Defense Industry Engineer xxx

    Sep 2, 2004
    Retired Systems engineer for defense industry.
    New England
    A shower usually doesn't need it, and if it does, expansion chambers are old school, and never worked very well for long - they quickly become waterlogged and are often impossible to recharge. If you need hammer arresters, put in the real thing. Sioux Chief and others make them. these are either a bladder or a sealed piston chamber that will stay dry and working for many years. Think finger over the end of a straw...once full of water, the end stays capped, they rarely drain and thus are useless.
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  4. hj

    hj Moderator & Master Plumber Staff Member

    Aug 31, 2004
    Cave Creek, Arizona
    Piston type can also fail or respond slowly when the "O" ring seals start to stick. A bellows is the one which will last the longest, but the bellows can also fail if the "folds" develop metal fatigue. Therefore, any mechanical one should have provision for accessing it for replacement purposes.
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