工程规格说明书范文
Sample Engineering Specification

　　所有热塑性塑料针形阀结构材料应该采用PVC，ASTM D 1784分类12454，CPVC，ASTM D 1784分类23447，或聚丙烯ASTM D 4101。所有阀门应该是截止阀结构或角形阀结构阀体，配置DN8，DN10或DN15内螺纹NPT连接端口。所有阀门应该配置可拆卸阀盖帽，带可更换PTFE密封。不应该采用弹性材料密封。所有阀门应该内置面板安装螺母和高强度抗冲击聚丙烯手柄。在水温23^oC条件下，所有PVC和CPVC材质阀门压力等级应该是235 psi，而所有聚丙烯阀门的压力等级应该是150 psi，并由美国斯毕尔制造公司制造。
　　All thermoplastic Needle Valves shall be constructed from PVC, ASTM D 1784 Cell Classification 12454, CPVC, ASTM D 1784 Cell Classification 23447, or Polypropylene, ASTM D 4101. All valves shall be globe pattern or angle pattern body configuration with ¹/₄", ³/₈" or ¹/₂" female NPT end connections. All valves shall have removable bonnet cap with replaceable PTFE seal. No elastomer seals shall be used. All valves shall have built-in panel mounting nut and high impact polypropylene handles. All PVC and CPVC valves shall be pressure rated to 235 psi and all Polypropylene valves to 150 psi for water @ 73^oF, as manufactured by Spears® Manufacturing Company.

特点 - PVC，CPVC和PP
Feature - PVC, CPVC & PP

　　针形阀具有与针形流道成正比的开启度，适用于精确计量和其他精细调节流量控制的应用领域。特殊结构的PTFE密封消除了弹性材料类型密封或O形环可能产生的化学兼容性问题。PVC，CPVC和聚丙烯材质阀门可提供DN8、DN10和DN15通径的美国锥管螺纹NPT内螺纹连接端口的截止阀结构或特殊角阀结构的针形阀，避免在各种系统装置内采用额外的弯管。
　　Needle Valves provide proportional opening to needle travel for more accurate metering applications and other fine adjustment flow control applications. Special design PTFE seal eliminates elastomer type seals or O-rings that can contribute to chemical compatibility problems. PVC, CPVC and Polypropylene valves are available with ¹/₄", ³/₈" and ¹/₂" NPT femal threaded ends in either standard Globe Pattern or special Angle Pattern configuration that eliminates need for additional elbow in various system setups.

• 抗化学品和耐腐蚀的PVC，CPVC或PP材料结构
  Chemical & Corrosion Resistant PVC, CPVC or PP Construction
• 精确的计量内腔
  Precision Metering Chamber
• 截止阀结构和角阀结构
  Globe & Angle Body Configurations
• 可拆卸阀盖，易于进行拆卸和施加润滑剂
  Removable Bonnet For Easy Disassembly & Lubricants Used
• 内置面板或支架安装螺母
  Built-in Panel or Bracket Mounting Nut
• 易于抓握的聚丙烯手柄
  Easy-Grip Polypropylene Handle
• PVC和CPVC材质阀门的压力等级是235 psi @ 23^oC
  聚丙烯材质阀门压力等级是150 psi @ 23^oC
  PVC & CPVC Pressure Rated to 235 psi @ 73^oF
  Polypropylene Pressure Rated to 150 psi @ 73^oF

流量系数值
Cv Valvues

1. 对于CPVC材质阀门，将字母“C”加在阀门型号上，例如：5591-002C
   For CPVC Valve, add the letter "C" to the part number (e.g., 5591-002C)
2. 对于螺纹聚丙烯阀门，将字母“P”加在型号上，例如：5591-002P，5591-005PSR
   For threaded Polypropylene Valve, add the letter "P" to the part number (e.g., 5591-002P, 5591-005PSR)