How to distinguish between full copper triangle valve and zinc alloy triangle valve?
three hold, can see the quality of material used to hold methods, some businesses will use cast iron material posing copper the copper zinc alloy or metal, with hardware for two or three seconds after the release, the fog and the traces disappear quickly can be found in the copper, if the mist, lingering traces of material, probably non copper.
In general, the surface is bright and smooth, mirror effect is more obvious, the better coating process; two listen, listen to the sales staff introduction mainly for coating, triangle valve good not only experienced the pre grinding, polishing, dust, and up to six or seven layers of nickel and chrome plating coating process, the more, the better the quality;
Copper or zinc alloy triangular valve to distinguish the surface of chrome plated need to master some methods: a look, often used triangular valve like new, to look at the coating is good.
