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  1. #1
    Join Date
    Aug 2013
    Location
    SW Leicestershire
    Posts
    1,112

    Default Testing ball valve seacocks

    I have mostly Blakes seacocks which are easy to check. I also have 2 ball valves, one fitted last year to the engine cooling water inlet by someone who I know would only use correct material, and another fitted 5 years ago by someone who may not have been as scrupulous - how do i inspect a ball valve?

  2. #2
    Join Date
    May 2001
    Location
    North Wales, sailing Aegean Sea or Menai Strait
    Posts
    21,896

    Default Re: Testing ball valve seacocks

    Brass valves are plated and appear silver. DZR are unplated and marked as such or with the CR logo. Bronze ones will not be plated. They can all be disassembled if you wish but there is not a lot that can be done. Worth looking in bronze ones as the ball may be brass, in which case it can become pitted. There is a lot on this subject on my website.
    Answers to some technical queries at new website http://coxeng.co.uk

  3. #3
    Join Date
    Feb 2010
    Posts
    1,505

    Default Re: Testing ball valve seacocks

    Changwe it if it is suspect. It isn't that hard a job for the DIYer and the peace of mind is worth the expense. Checkout vyvs website.

  4. #4
    Join Date
    Aug 2013
    Location
    SW Leicestershire
    Posts
    1,112

    Default Re: Testing ball valve seacocks

    Thanks

  5. #5
    Join Date
    Jul 2011
    Posts
    438

    Default Re: Testing ball valve seacocks

    All the valves, all ball, I open and close a few times as part of my monthly routine. They get stiff and seize with lack of use

  6. #6
    Join Date
    Oct 2006
    Location
    Bradwell and Leigh-on-Sea
    Posts
    14,478

    Default Re: Testing ball valve seacocks

    The seacock on my loo outlet was changed by me about 6-7 years ago. A good ISIS DN40. The handle felt firm, a confident open/close motion. I had my suspicions that the outlet was pasrtly blocked and on Friday, with the boat on the hard, I took the hose off. Hose in great shape after 9 years. Seacock jammed about a quarter open. Handles feels good but nothing moves. So you can wiggle the handle all you like and sleep well. Physical inspection is everything, perhaps with a torch from outside when not in the water.
    Not all who wander are lost

  7. #7
    Join Date
    May 2001
    Location
    North Wales, sailing Aegean Sea or Menai Strait
    Posts
    21,896

    Default Re: Testing ball valve seacocks

    Quote Originally Posted by MoodySabre View Post
    The seacock on my loo outlet was changed by me about 6-7 years ago. A good ISIS DN40. The handle felt firm, a confident open/close motion. I had my suspicions that the outlet was pasrtly blocked and on Friday, with the boat on the hard, I took the hose off. Hose in great shape after 9 years. Seacock jammed about a quarter open. Handles feels good but nothing moves. So you can wiggle the handle all you like and sleep well. Physical inspection is everything, perhaps with a torch from outside when not in the water.
    Same happened to me with my fridge seawater supply. The stem had dezincified and broken handle turned and felt OK. Fortunately enough water passing for it to work.
    Answers to some technical queries at new website http://coxeng.co.uk

  8. #8
    Join Date
    Apr 2005
    Location
    Shropshire
    Posts
    8,867

    Default Re: Testing ball valve seacocks

    I had the same - one of my 1.25" dia cockpit drains had much slower flow than the other so I pulled the hose off (when dried out) and found that the slow one's spindle had disintegrated so whatever position the handle was in, the ball remainded partially open. I replaced both with grade 316 stainless (I hadn't heard of crevice corrosion at the time).

  9. #9
    Join Date
    Oct 2002
    Location
    Chichester
    Posts
    808

    Default Re: Testing ball valve seacocks

    I have stainless ones too. Two of them are 15 years old and still in good condition.

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