套管 Spigot	对夹 Wafer
卡箍 Grooved	螺纹 Threaded
法兰 Flanged

工程规格说明书范文
Sample Engineering Specification

　　所有热塑性塑料止回阀应该是蝶式结构，其结构材料应该采用PVC类型I, ASTM D 1784分类12454或CPVC类型IV, ASTM D 1784分类23447。阀门连接方式应该是法兰，套管，外螺纹，卡箍或对夹。所有阀门密封材质应该是强化EPDM或Viton®，并且是可更换的内部部件。在水温23^oC条件下，所有通径DN50 ~ DN200阀门压力等级应该是150 psi；所有通径DN250 ~ DN400阀门压力等级应该是100 psi；所有通径DN450 ~ DN600阀门压力等级应该是50 psi，并由美国斯毕尔制造公司制造。
　　All thermoplastic Check Valves shall be Butterfly design constructed from PVC Type I, ASTM D 1784 Cell Classification 12454 or CPVC Type IV, ASTM D 1784 Cell classification 23447. Valves shall be Flanged, Spigot, Male Threaded, Grooved end or Wafer style. All valve seals shall be reinforced EPDM or Viton® and replaceable internal components. All 2" - 8" valves shall be pressure rated at 150 psi, all 10" - 16" valves at 100 psi for water at 73^oF, all 18" - 24" valves at 50 psi for water at 73^oF, as manufactured by Spears® Manufacturing Company.

特点 - PVC, CPVC
Features - PVC, CPVC

　　这种多用途止回阀高度极低，对回流反应很快，并且不会发生拍击现象。由于大多数部件都位于阀体内，美国斯毕尔公司蝶式止回阀所需要的空间并不比管道或管件大。特殊的结构整合了经久耐用的柔韧加固弹性材料密封和适用于安装在任何位置的更广的通用性。国际管道标准通径范围在DN50 ~ DN300之间的蝶式止回阀，可提供的连接方式有法兰、套管、外螺纹、卡箍管类型和对夹；国际管道标准通径范围在DN350 ~ DN600之间的蝶式止回阀，可提供的连接方式有法兰、套管、卡箍和对夹。可以根据实际应用的任何标准管道口径进行定制生产。
　　This multi-purpose check valve provides an extremely low profile and very quick response to back flow without slamming. Since most all components are internal, Spears® Butterfly Check Valves require no more space than a piece of pipe and fitting. Special design incorporates flexible reinforced elastomer seal for long life and is suitable for mounting in any position for greater versatility. Available in IPS sizes 2" - 12" with Flanged, Spigot, male Threaded, Grooved Pipe style & Wafer end connections, and 14" - 24" Flanged, Spigot, Grooved & Wafer end connections. Can be custom produced to virtually any standard pipe diameter.

• 耐化学品的PVC和CPVC材料结构
  Chemical Resistant PVC & CPVC Construction
• 无金属部件
  No Metal Components
• 在任何位置均可快速反应关闭
  Quick Response Shut-off In Any Position
• 可更换的内部部件 - 可选择强化EPDM材质或Viton®材质
  Replaceable Internal Components - Choice of Reinforced EPDM or Viton®
• 适用于水平或垂直安装
  Suitable for Horizontal or Vertical Installation
• 在水温23^oC条件下，通径DN50 ~ DN200阀门压力等级为150 psi
  Sizes 2" - 8" Pressure Rated to 150 psi for water at 73^oF,
  在水温23^oC条件下，通径DN250 ~ DN400阀门压力等级为100 psi
  Sizes 10" - 16" Pressure rated to 100 psi for water at 73^oF
  在水温23^oC条件下，通径DN450 ~ DN600阀门压力等级为50 psi
  Sizes 18" - 24" Pressure rated to 50 psi for water at 73^oF
• 采用无硅树脂、水溶性润滑剂组装
  Assembled with Silicone-Free, Water Soluble Lubricants