译文：
家庭常用阀门的选购妙招： 　　选购时目测阀门，表面应无砂眼；电镀表面应光泽均匀，须注重有无脱皮、龟裂、烧焦、露底、剥落、黑斑及明显的麻点等缺陷；喷涂表面组织应细密、光滑均匀，不得有流挂、露底等缺陷。 　　一、了解阀门知识： 　　民用阀门目前普通家庭常用的一般有闸阀、球阀、三角阀等形式，一般为铁制或铜制。由于铜合金的力学性能好，具有不易生锈、耐蚀性强的优点，因此铜制阀门已渐渐取代了铁制阀门。三角阀表面基本都采用电镀，它的作用不仅是控制管道介质的流量，也能起到装饰作用。三角阀一般连接管道和进水软管用于水嘴、坐便器供水用，也有连接管道和进水软管用于热水器供水的。闸阀基本用于管道和水表的连接；球阀用于管道和热水器的连接；由于球阀启闭比闸阀方便，目前管道和水表的连接也大部分采用球阀。 　　二、掌握民用阀门的选购方法：应根据使用者的不同要求选择不同类型的家用阀门： 　　1.选购时目测阀门，表面应无砂眼；电镀表面应光泽均匀，须注重有无脱皮、龟裂、烧焦、露底、剥落、黑斑及明显的麻点等缺陷；喷涂表面组织应细密、光滑均匀，不得有流挂、露底等缺陷。上述缺陷会直接影响阀门的使用寿命。 2.阀门的管螺纹是与管道连接的，在选购时目测螺纹表面有无凹痕、断牙等明显缺陷，非凡要注重的是管螺纹与连接件的旋合有效长度将影响密封的可靠性，选购时要注重管螺纹的有效长度。一般DN15的圆柱管螺纹有效长度在10mm左右。 　　3.闸阀、球阀一般在其阀体或手柄上标有公称压力，选购时可根据自己的需要选择。 4.更换现有的闸阀或球阀时，要弄清其结构长度，以免购买后不能安装。 5.三角阀的管螺纹有内螺纹和外螺纹两种，要根据需要选购；还要注重的是目前市场上有部分锌合金制造的三角阀，该阀门售价比一般产品要低，但易腐蚀而造成断裂。 6、应尽量在正规的建材商店、超市选购，这样产品质量较能保证。

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原文：
Home purchase common valve coup: Purchase visual valve, the surface should be no trachoma; plating surface should be shiny uniform, should pay attention to whether or not peeling, cracking, burning, exposed bottom, peeling, dark spots and obvious defects such as pitting; spraying the surface structure should be fine, smooth and uniform, not a stream linked to defects such as exposed bottom. First, understand the valve of knowledge: Civil valves commonly used in the average family now generally gate valve, ball valve, triangle valve, etc., usually iron or copper. As good mechanical properties of copper alloy, is not easily rust and corrosion resistance advantages, it has gradually replaced the valve copper valve iron. Triangle valve basically electroplated surface, its role is not only control the flow of media channels, can also play a decorative role. Triangle valve normally connecting pipes and water hoses for faucets, toilet water supply, but also to connect the inlet hose pipe and water supply for the water heater. Basic for the pipes and water meter valve connection; ball valve for connecting pipes and water heaters; as ball valve open and close easily than the current pipeline and meter connections are most used ball. Second, civilian control valve selection methods: should be selected according to different requirements of users of different types of domestic valve: 1. Purchase visual valve, the surface should be no trachoma; plating surface should be shiny uniform, should pay attention to whether or not peeling, cracking, burning, exposed bottom, peeling, dark spots and obvious defects such as pitting; spraying the surface of organizations fine, smooth and uniform, not a stream linked to defects such as exposed bottom. The defect will directly affect the life of the valve. 2. Valve pipe thread connection with the pipe, in choosing whether or not dent the surface when the visual thread, broken teeth and other obvious defects, extraordinary attention should be paid is to connect pieces of pipe thread and the effective length of the rotary joint will affect the seal reliability, attention should be paid when purchasing the effective length of the pipe threads. General DN15 effective length of cylindrical pipe thread about the 10mm. 3. Valve, ball valve or general in its nominal pressure is marked on the handle, the time of purchase options according to their needs. 4. The replacement of existing gate valve or ball valve, you should find out the length of its structure, so that can not be installed after purchase. 5. Triangle valve with internal thread pipe thread and external thread of two, to choose according to need; have to pay attention to is currently on the market, some triangular zinc alloy valves, the valve price is lower than the average product, but was easy to fracture caused by corrosion. 6, should be in the formal building materials stores, supermarkets, shopping, so more can guarantee product quality.