工程规格说明书范文
Sample Engineering Specification

　　所有热塑性塑料隔膜止回阀应该是隔膜设计结构，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。阀门连接端口应该是承插或螺纹。所有隔膜应该采用Santoprene™ TPE材质。在水温23^oC条件下，压力等级为150 psi全流量（开启），100 psi回压（关闭），并由美国斯毕尔制造公司制造。
　　All thermoplastic Diaphragm Check Valves shall be Diapgragm 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 socket or threaded ends. All diaphragms shall be Santoprene™ TPE material. Valves shall be pressure rated at 150 psi full-flow (open), 100 psi back pressure (closed) for water @ 73^oF, as manufactured by Spears® Manufacturing Company.

特点 - PVC, CPVC
Features - PVC, CPVC

　　美国斯毕尔公司隔膜止回阀不依赖于重力，弹簧，甚至不依赖于流向阀座的回流。有弹力的热塑性弹性材料（TPE）隔膜是这种阀门内唯一的可移动部件，它能够在流动停止时阀座自动关闭。不会沾粘，没有噪音。这种专业弹性材料具有高弯曲度和抗撕裂性，因此更加经久耐用。可提供PVC和CPVC材质的这种阀门，其通径是DN20，连结端口为承插和螺纹。
　　Spears® Diaphragm Check Valves do not depend on gravity, springs, or even reverse flow to seat. Resilient thermoplastic elastomer (TPE) diaphragm is the only moving component, which automatically seats when flow stops. No sticking, no chatter. This specialty elastomer exhibits high flex and tear resistance to provide excellent durability and long life. Valves are available in PVC and CPVC material size of ³/₄" with socket and threaded end connections.

• 特别适用于低阀座压力的应用场合，在低压下也能够实现“正常关闭”功能
  "Nomally Closed" operation is excellent for applications with low seating pressure
• 低开启压力，1至1.5 psi
  Low cracking pressure, 1 to 1¹/₂ psi
• 无泄漏，无噪音运行
  Leak-free, silent operation
• 就象活接头一样安- 在任何位置
  Installs just like a Union - in ANY position
• 在水温23^oC条件下，压力等级为150 psi全流量（开启），100 psi回压（关闭）。
  Pressure rated to 150 psi full-flow (open), 100 psi back pressure (closed) for water @ 73^oF
• 经久耐用的Santoprene™ TPE材质隔膜阀座 - 完全可维修和可更换
  Santoprene™ TPE diaphragm seat provides extended life and durability - fully serviceable and replaceable
• 所有材料都获得美国国家卫生基金会认证可用于饮用水
  All materials are NSF Certified for use with potable water

1. 对于CPVC材质隔膜止回阀，将字母"C"加在型号上，例如：6562-007C
   For CPVC Diaphragm Check Valve, add the letter "C" to the part number (e.g. 6562-007C)

备件
Replacement Parts

　　注：安装止回阀时必须使阀门流向箭头指向流体流动方向。流速不能超过5英尺/秒。不要采用活接头螺母来将系统部件拉在一起。使用带式扳手，在手力紧固后再紧固不超过¹/₁₆圈。不要使用常规管道扳手。
　　NOTE: Check valves MUST be installed with the valve's FLOW arrow pointing in the direction of the flow. Flow velocity should not exceed 5 ft./sec. Do not use Union Nut to draw together system components. Using a strap wrench, tighten hand-tight plus no more than ¹/₁₆ turn. Do not use conventional pipe wrenches.

Santoprene™是EXXON Mobile有限公司的注册商标
Santoprene™ is a trademark of Exxon Mobile Corporation