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Thread: Leak in KWC Shower Rough valve

  1. #1
    DIY Junior Member garym's Avatar
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    Default Leak in KWC Shower Rough valve

    Thoughts on possible sources of this problem are VERY welcome. Background: New install of "KWC, 1/2" Rough Valve for Thermostatic Trims - K.37.93.61.931.38" LINK:
    http://www.kwcamerica.com/-hansa/doc...ec%20Sheet.pdf

    new copper lines to valve. The Tub spout drips (sometimes slow drip, sometimes nothing, and sometimes a small stream of running water). Turning on the sink or kitchen faucet can make the leak worse (or start if not currently leaking). So a change in water pressure affects leak? Plumber thought the valve was bad. Replaced with new valve. Didn't leak at all overnight. Next morning, turned on bathroom sink, then new shower valve started leaking again. He thinks another bad valve. I find this hard to believe and I'm looking for some ideas on what else might be wrong with the install that causes the valve to leak. Thoughts appreciated.

  2. #2
    Master Plumber Redwood's Avatar
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    I have been known to put KWC and Hansa brass in scrap bins...

  3. #3
    Moderator & Master Plumber hj's Avatar
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    Default valve

    Valves do not leak when the pressure drops,and seldom when it increases. And if it shuts off properly it should not start leaking. Unless, the handle is a heavy lever one and when the pressure decreases it lets the mechanism rotate easier and then the valve could start leaking. Maybe you need a better brand of valve,or reposition the handle.

  4. #4
    Master Plumber Redwood's Avatar
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    But HJ they probably spent a G-Note or better on it!

  5. #5
    DIY Junior Member garym's Avatar
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    touche' What brands do you recommend for good reliability that have nicer than average fixtures (pressure and temp controls, with diverter). Thanks.

  6. #6
    Retired Defense Industry Engineer jadnashua's Avatar
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    Note, I'm not a pro, but have had good luck with Grohe. The pros here seem to like the Delta 1700 rough-in valve and your choice of trim.
    Jim DeBruycker
    Important note - I'm not a pro
    Retired Defense Industry Engineer; Schluter 2.5-day Workshop Completed 2013, 2014

  7. #7
    Master Plumber Redwood's Avatar
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    Grohe is good with lots less parts headaches...

    The majority of what I do is Moen or Delta though...
    I believe Moen has the best customer service out of any of them...

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