标准阀门
Standard Valve

• 全PVC材料结构，配置EPDM阀瓣密封
  All PVC Construction with EPDM Flapper Seal
• 螺纹顶部塞，便于维修
  Threaded Top Plug for Convenient Service
• 简易的卡扣式内部阀瓣总成，易于更换
  Simple Snap-In Internal Flapper Assembly for Easy Replacement
• 备选的工厂组装“维修-进入加长组件” - 带有内部加长件的外部保护壳，便于拆卸，检查或更换
  Optional Factory Assembled Service-Access Extension Kits - External Housing with Internal Extension for Convenient Removal, Inspection or Replacement
• 备选的加长部件组件，用于与用户自备管道的组装
  Optional Extention Components Kits for Assembly with User-Supplied Pipe
• 可提供通径DN50, DN80, DN100和DN150承插连接端口的阀门
  Available in Sizes 2", 3", 4" and 6" with Socket Ends
• 直接连接到美国材料实验协会ASTM D 2665 PVC DWV排水、排渣与方气管道或其他国际管道标准IPS通径的管道。可提供美国斯毕尔公司IPS x 下水道适配器，用于连接到ASTM 3034下水道
  Direct Connection to ASTM D 2665 PVC DWV or other IPS size pipe. Spears® IPS x Sewer Adapters Available for Connection to ASTM 3034 Sewer
• 符合美国机械工程师协会和美国国家标准协会ASME/ANSI A112.14.1关于回水阀的有关要求
  Conforms to ASME/ANSI A112.14.1 for Backwater Valves
• 压力等级为43 psi （100压头英尺）@ 23^oC
  Pressure Rated to 43 psi (100 feet of head) @ 73^oF

工程规格说明书范文
Sample Engineering Specification

　　所有热塑性塑料阀门应该是回水阀结构，其结构材料应该采用PVC类型I, ASTM D 1784分类12454。所有阀门阀座材质应该是EPDM。所有阀门应该有外部流向箭头标志。在水温23^oC条件下，所有阀门压力等级应该是43 psi（100压头英尺），并由美国斯毕尔制造公司制造。
　　All thermoplastic valves shall be Backwater type constructed from PVC Type I, ASTM D 1784 Cell Classification 12454. All Valve Seats shall be EPDM. All valves shall have external Arrow Flow Indicator. All valves shall be pressure rated to 43 psi (100 feet of Head) for water @ 73^oF as manufactured by Spears® Manufacturing Company.

标准配置回水阀快速选型表
Quick-View Backwater Valve
Selection Chart Standard Valve

特点 - PVC白
Features - PVC White

　　在许多要求能够容易地接近进行维护和清洗的应用场合，回水阀设计用来防止逆流。特别适用于在卫生设备或雨水排放系统中由于排放出现异常时防止污水倒流，也适用于多级水池，水产业，储油罐系统，以及许多其他应用场合。美国斯毕尔公司回水阀在功能上有所改善，更容易维修，特别是在与备选件“维修-进入加长组件”一起使用的掩埋应用场合。
　　Backwater Valves are designed to prevent backflow in numerous applications where easy service access for maintenance and cleaning is needed. Excellent for use in sanitary or storm sewer drainage systems to prevent waste back up due to inadequate drainage, for balancing multi-level ponds, aquaculture features or storage tank systems, and many other applications. Spears® Backwater Valve has been engineered for improved function and easier service, especially in buried service with use of optional Service-Access Extension Kit.

与加长组件一起使用的阀门
Valve with Extension Kit

PVC“维修-进入加长组件”备选件：
PVC Service-Access Extension Kit Options:

　　可作为一个完整装置提供，带或不带阀门，工厂组装包括内部阀瓣总成，加长管，以及带顶部进入适配件的外壳，长度增量有12英寸，16英寸，20英寸，24英寸，36英寸和48英寸（长度计算从阀门顶部到加长件顶部）。所有加长组件可以现场切短以适应实际应用场合。也可作为加长部件组件提供，带或不带阀门，用于与用户自备的压力等级Class 125管道或壁厚Schedule 40管道一起组装。不带阀门的组件要求利用现存的阀门顶部进入塞，所有组件组装到阀门上时都要求采用液状粘固剂。请咨询美国斯毕尔公司了解定制切割长度的价格。
　　Available as a complete unit, with or without valve, factory assembled to internal flap assembly, extension pipe, and external extension housing with top access adapter in convenient increments of 12", 16", 20", 24", 36", and 48" (measured from top of valve to top of extension). All extension kits can be cut shorter in the field for custom fits. Also available as Extension Components Kits, with or without valve for assembly with user-supplied Class 125 or Schedule 40 pipe. Kits without valve require use of existing valve top Access Plug, all kits require solvent cement assembly to valve. Contact Spears® for pricing on custom cut lengths.

加长部件组件快速选型表
Quick View Extension Components Kit Options

　　加长适配件和阀瓣总成带或不带阀门。必须与用户自备的压力等级Class 125管道或壁厚Schedule 40管道一起组装。
　　Extension Adapters and Flap Assembly with or without valve. Must be assembled with user-supplied Class 125 or Schedule 40 Pipe.