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法兰旋启式止回阀，其结构材料应该是PVC类型I, ASTM D 1784分类12454或CPVC类型IV, ASTM D 1784分类23447，或聚丙烯, ASTM D 4101。所有O形环材质应该是EPDM或Viton®。所有阀门部件应该是可更换的。所有阀门应该配置顶部进入的进口，并带O形环密封排放塞，适用于在线维修。所有阀门应该有备选的外置箭头位置指示器或备选外置平衡锤。在水温23^oC条件下，所有通径DN20 ~ DN100阀门压力等级应该是150 psi，所有通径DN150阀门压力等级应该是100 psi，而所有通径DN200阀门压力等级为70 psi，并由美国斯毕尔制造公司制造。
　　All thermoplastic check valves shall be flanged Swing Check type constructed from PVC Type I, ASTM D 1784 Cell Classification 12454 or CPVC Type IV, ASTM D 1784 Cell Classification 23447, or Polypropylene, ASTM D 4101. All O-rings shall be EPDM or Viton®. All valves components shall be replaceable. All valves shall have top-entry access with O-ring sealed drain plug for in-line servicing. All valves shall have optional external Arrow Position Indicator or optional external Counter Balance. All ³/₄" - 4" valves shall be pressure rated to 150 psi, all 6" valves to 100 psi, and all 8" valves to 70 psi for water at 73^oF, as manufactured by Spears® Manufacturing Company.

快速阀门选型表
Quick-View Valve Selection Chart

特点 - PVC, CPVC和聚丙烯
Features - PVC, CPVC & PP

　　设计以最大限度减少流体紊乱前提下实现优化流量、快速反应和积极有效的关闭，这种止回阀适用于需要进行大流量传输的工业和化工处理应用领域。可用于水平或流向垂直朝上的管道上。可提供的材质包括PVC, CPVC和玻璃纤维填充聚丙烯，国际管道标准IPS通径DN20 ~ DN200，法兰连接端口。
　　Designed for optimum flow, quick response and positive shutoff with minimum turbulence, this industrial and chemical processing applications where high volume fluid trandfer is required. Suitable for horizontal or up-flow vertical applications. Available in PVC, CPVC and Glass Filled Polypropylene, IPS ³/₄" - 8" with Flanged Body.

　　设计用于快速反应，全流道流体传输
　　Engineering for Quick Response, Full-Flow Fluid Transfer

• 重型阀体全塑料内部结构
  Heavy Bodied All-Plastic Interior Construction
• 顶部进入和O形环密封排放塞，适用于在线维修
  Top Access & O-ring Sealed Drain Plug for In-Line Servicing
• 标准O形环阀座和密封，材质为EPDM或Viton®
  Standard O-ring type Seat & Seals in EPDM or Viton®
• 通径DN20 ~ DN100止回阀压力等级为150 psi @ 23^oC, 通径DN150止回阀压力等级为100 psi而DN200止回阀压力等级为70 psi @ 23^oC
  Sizes ³/₄" - 4" Pressure Rated to 150 psi @ 73^oF, 6" Pressure Rated to 100 psi and 8" to 70 psi @ 73^oF
• 不锈钢外部五金件
  Stainless Steel External Hardware
• 完全可维修、可更换部件
  Fully Serviceable, Replaceable Components
• 适用于真空应用场合
  Suitable for Vacuum Service
• 采用无硅树脂、水溶性润滑剂
  Assembled with Silicone-Free, Water Soluble Lubricants

备选件与附件
Options & Accessories

• 外置箭头位置指示器¹
  External Arrow Position Indicator¹
• 外置平衡锤¹
  External Counter Balance¹
• 天然聚丙烯阀体
  Natural Polypropylene Body

1. 可提供作为组装阀门或组件，适用于已安装的阀门
   Available as assembled valve or kit for installed valve

一般安装信息：
General Installation Information:

　　工业旋启式止回阀设计用于水平安装，但是也可以安装在流向朝上的垂直管道上。止回阀安装时必须使其阀体上的流向箭头指向流体流向。不要朝下安装阀门。阀门法兰顶部螺栓孔的法兰螺栓组装通常要求穿过配对法兰的插入螺栓要用螺母紧固在旋启式止回阀法兰一侧上。某些系统配置，包括旋启式止回阀直接连接到其他法兰设备的场合可能要求考虑这种螺栓所需要的间隔。
　　Industrial Swing check valves are designed for horizontal installations, but may be installed in up-flow only vertical position. Check valves MUST be installed with the valves FLOW arrow pointing in the direction of flow. Do not install valve upside down. Normal flange-bolt assembly in top holes of the valve flange requires bolt insertion through the companion flange with nuts secured on Swing Check flange side. Certain system configurations involving direct connection of a Swing Check Valve to other flanged equipment may require consideration of this bolt clearance.