The so-called double-handle taps valve is cold and hot water are controlled with a single spool, single handle valve relatively large volume of water in terms of it, especially the spiral valve. Therefore, a large number of European countries in the use of such spool.
Tap valve is the “heart”, so when consumers buy tap parts are often very concerned about this. I worked in a well-known enterprises tap some time, and in a large-scale foreign trade company engaged in the sanitary quality of products, purchasing director job two years or so, had the honor of many well-known study of sanitary production technology, equipment, and product quality system and their parts suppliers, each from their manufacturing facilities and other sanitary products purchased there are 600-800 million U.S. dollars export to Europe and America. I always tell the customer contact tracking, foreign information fed back to the spool parts that do not have much quality.
Maybe you will not believe that these well-known sanitary ware manufacturer of domestic procurement of these small-scale spool mostly from businesses, manufacturers can imagine the quality of these parts management. However, due to the simple valve core components, process maturity, quality and generally not be a big problem. And because of the internal valve installed in the faucet, so when the reader in the procurement of such a tap, just check whether there is catching handle rotation, loose, double-handle taps,cold and hot valve handle to open the rotation angle are the same will be enough. But the faucet warranty certificate is necessary.
If stem leakage, but also beyond the warranty period, these small issues you can begin to resolve what, for some O-ring that is relatively easy to do. However, the export spool leakage, if it is ceramic valve core, it had to be replaced. If the spiral valve, the replacement of rubber seals look, if it is sliding screw teeth, no option but to replace the entire spool. The spool is not expensive, at present, only 4-5 per one ex-factory price.