阀门结构种类、材质、认证
阀门结构种类 Valve Design Choices
1. 多回转阀门 1. Multi-Turn a) 闸阀 a) Gate b) 截止阀/角-截止阀 b) Globe/Angle-Globe 2. 90o回转阀门 2. Quarter-Turn a) 球阀 a) Ball b) 蝶阀-弹性阀座 b) Butterfly-resilient seated 3. 止回阀(阻止倒流) 3. Check (backflow prevention) a) 旋启式 a) Swing b) 升降式 b) Lift c) 弹簧驱动式 c) Spring-actuated 4. 连接端口 4. End connections
材质 Materials
1. 青铜(压力150 psi下温度可达287oC;温度65oC下压力可达600 psi),通径范围:DN8至DN80 1. Bronze (up to 550°F at 150 psi/up to 600 psi at 150°F) 1/4"-3" 2. 铸铁(压力250 psi下温度可达232oC;温度37oC下压力可达500 psi),通径范围:DN50至DN600 2. Cast Iron (up to 450°F at 250 psi/up to 500 psi at 100°F) 2"-24" 3. 球墨铸铁(压力125 psi下温度可达343oC;温度37oC下压力可达600 psi),通径范围:DN50至DN300 3. Ductile Iron (up to 650°F at 125 psi/up to 600 psi at 100°F) 2"-12" 4. 不锈钢(压力125 psi下温度可达343oC;温度37oC下压力可高达2000 psi),通径范围:DN8至DN300 4. Stainless Steel (up to 650°F at 125 psi/up to 2000 psi at 100°F) 1/4"-12"
认证 Approvals
1. 美国阀门和管件制造商标准化协会(MSS) 1. Manufacturers Standardization Society (MSS) 2. 消防**认证(UL®和FM) 2. Fire protection (UL® and FM) 3. 州立标准和地方标准 3. State and local codes.