工程规格说明书范文
Sample Engineering Specification

　　所有热塑性塑料球阀应该是铜管口径（CTS）密封装置类型，结构材料为CPVC类型IV，ASTM D 1784分类23447。所有O形环材质应该是EPDM。所有阀门应该获得美国国家卫生基金会NSF国际部认证可用于饮用水。在水温82^oC条件下，所有阀门压力等级应该是100 psi，并由美国斯毕尔制造公司制造。
　　All thermoplastic ball valves shall be Copper Tube Size (CTS) sealed unit type constructed from CPVC Type IV, ASTM D1784 Cell Classification 23447. All O-rings shall be EPDM. All valves shall have double stop Polypropylene handle. All valves shall be certified by NSF International for use in potable water service. All valves shall be pressure rated at 100 psi for water at 180^oF, as manufactured by Spears® Manufacturing Company.

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

特点 - PVC白，PVC灰和CPVC
Feartures - PVC White, PVC Gray & CPVC

　　高质量，90度旋转关闭阀结构，用于铜管口径（CTS）标准的CPVC热水和冷水分流系统管道关闭用途，符合美国材料实验协会ASTM D 2846标准。获得美国国家、州和大多数城市建筑标准认证，可用于住宅和商业建筑，以及休闲娱乐车辆、模块房屋和移动房屋等应用领域。咨询当地建筑标准，了解此阀门的可接受性和限制性。可提供CTS通径DN15~DN50承插连接端口阀门。
　　A high quality, quarter-turn shutoff valve designed for line-stop use in Copper Tube Size (CTS) CPVC hot and cold water distribution systems as specified in ASTM D 2846. Approved by national, state and most municipal building codes for use in residential and commercial structures, as well as recreational vehicles, modular homes and mobile home applications. Check local codes for acceptability and restrictions. Available in CTS sizes ¹/₂" - 2" with socket end connectors.

• 耐化学品和耐腐蚀CPVC材料结构
  Chemical & Corrosion Resistant CPVC Construction
• 无维护保养密封装置
  Maintenance-Free Sealed Unit
• 高强度、抗冲击聚丙烯手柄
  High Impact Polypropylene Handle
• 美国斯毕尔公司单O形环Safe-T-Shear®商标阀杆结构
  Spears® Single O-ring Safe-T-Shear® Stem Design
• EPDM材质O形环
  EPDM O-rings
• Teflon® HDPE浮动阀座结构
  Teflon® HDPE Floating Seat Design
• 适用于商业热水系统
  Suitable for Commercial Hot Water Systems
• 通径DN15~DN50阀门压力等级为100 psi @ 82^oC
  Sizes ¹/₂" - 2" Pressure Rated to 100 psi @ 180^oF
• 美国国家卫生基金会NSF认证可用于饮用水
  NSF Certified for Potable Water use
• 采用无硅树脂、水溶性润滑剂组装而成
  Assembled with Silicone-Free, Water Soluble Lubricant
• 制造符合美国材料实验协会ASTM F 1970标准
  Manufactured to ASTM F 1970

1. 阀门放置长度
   Valve Lay Length
2. 指的是在压降1psi下每分钟流过的美制加仑值。这些参数是以哈森-威廉姆斯方程的导数与C=150表面粗糙度系数为基础，并根据阀门放置长度计算出来的。
   Gallons per minute at 1 psi pressure drop. Valves calculated from laying length, based on derivative of Hazen-Williams equation with surface roughness factor of C=150.