On Sun, 2010-01-03 at 01:20 +0000, Steve Blackmore wrote: > On Sat, 2 Jan 2010 11:04:29 -0800, you wrote: ... snip > >Chinese valves freeze and crack. This is because of voids and porosity of > >the castings. > > Dezincification failures are a big problem with cheap fittings > especially if they have been in use for some time in acidic water, and > it's not just a Chinese thing. I've seen it on European and USA made > fittings. The "American" fittings are probably DZR Brass, the Chinese > are probably any old recycled Brass, likely the shavings Matt was > talking about :) > > Good quality brass fittings are made from CZ132 Brass, which needs heat > treating to 500C or so after forging to resist dezincification. > > You can buy good Chinese fittings, just as you can buy bad American > ones. If you do suffer from dezincification buying from a good plumbers > supply shop or marine chandlers is a safer bet, you'll pay more, but > they should be able to supply decent fitting that will last a lifetime. > > Steve Blackmore
Thanks for the information Steve. Google also linked: http://www.hghouston.com/coppers/brass75.htm http://en.wikipedia.org/wiki/Brass http://en.wikipedia.org/wiki/DZR among other good links. I'm going to need a bigger head to fit some of this in. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ This SF.Net email is sponsored by the Verizon Developer Community Take advantage of Verizon's best-in-class app development support A streamlined, 14 day to market process makes app distribution fast and easy Join now and get one step closer to millions of Verizon customers http://p.sf.net/sfu/verizon-dev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
