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旋启止回球阀组合类型，其结构材料应该采用PVC类型I, ASTM D 1784分类12454。所有球阀装置应该配置Safe-T-Shear®阀杆，Safe-T-Blocked密封托架和双止动聚丙烯手柄。所有阀门部件应该是可更换的。所有旋启式止回阀装置应该配置无需维护密封装置结构，并采用EPDM材质阀座和加重阀瓣。所有阀门应该有外置流向箭头标志。在水温23^oC条件下，所有阀门在全流量（开启）位置的压力等级应该是150 psi，而在回压（关闭）位置的压力等级应该是75 psi，并由美国斯毕尔制造公司制造。
　　All thermoplastic check valves shall be Swing Check Ball Valve combination type constructed form PVC Type I, ASTM D 1784 Cell Classification 12454. All Ball Valve units shall have Safe-T-Shear® stem, Safe-T-Blocked® Seal Carrier and double stop Polypropylene handle. All valve components shall be replaceable. All Swing Check Units shall be maintenance free seal unit construction with EPDM seat and weighted disc. All valves shall have external flow arrow direction designation. All valves shall be pressure rated to 150 psi for water @ 73^oF in full flow (open) position and to 75 psi @ 73^oF back pressure (closed), as manufactured by Spears® Manufacturing Company.

尺寸
Dimensions

特点 - PVC白
Features - PVC White

　　美国斯毕尔公司旋启止回球阀是一种紧凑、高性能一件式组合阀门，用于要求串联球阀和止回阀的应用场合。这种节省空间、时间和人工的阀门设计用于通用用途，以及污水泵应用场合，如：喷射坑。具有快速关闭功能，便于泵或设备的工作运行。完全可维修的球阀，附带可更换、无需维护密封止回阀腔，配置经久耐用的EPDM弹性材料阀座和加重阀瓣，以实现全流量，最大限度减少流体阻力，实现积极有效的关闭。采用PVC白材料制造，配置承插端口连接件。可提供国际管道标准IPS通径DN40和DN50。
　　Spears® Swing Check Ball Valve offers a compact, high performance one-piece combination valve for applications requiring an in-line Ball Valve and Check Valve. This space, time and labor saving valve is designed for general purpose use and in wastewater pumping applications, such as ejector pits. Provides quick shut-off for easy pump or equipment servicing. Fully serviceable Ball Valve with replaceable, maintenance free sealed Check Valve Cartridge featuring long-life EPDM elastomer seats and weighted disc for full-flow with minimal restriction and positive shutoff. Produced in PVC White with socket end connectors. Available in IPS size 1¹/₂" and 2".

• 紧凑，节省空间的设计结构
  Compact, Space-Saving Design
• 组合结构便于维修和清洗
  Union Design Allows Easy Service and Cleaning
• 高等级EPDM材质阀座
  High Grade EPDM Seats
• 可更换的Teflon® HDPE球阀阀座
  Replaceable Teflon® HDPE Ball Valves Seats
• 球阀配置Safety-Blocked®密封托架，Safety-T-Shear®阀杆和高强度抗冲击聚丙烯手柄
  Safety-Blocked® Seal Carrier on Ball Valve with Safety-T-Shear® Stem and High Impact Polypropylene Handle
• 配置加重EPDM阀座的可更换密封止回阀阀腔
  Replaceable Sealed Check Valve Cartridge with Weighted EPDM Seat
• 压力等级为150 psi @ 23^oC全流量（开启），和75 psi @ 23^oC回压（关闭）
  Pressure Rated to 150 psi @ 73^oF Full-Flow (open) and 75 psi @ 73^oF Back Pressure (closed)
• 适用于水平或垂直朝上安装
  Suitable for Horizontal or Vertical Up-flow Installations

　　一般安装信息：旋启止回球阀设计用于水平安装，但是也可以安装在垂直朝上的位置。安装这种止回阀必须使阀门流向箭头指向流体流动方向，并在水平安装时使箭头标志一侧朝上。不要把止回阀朝下安装。球阀部分可以旋转并安装在任何位置。流体流速不能够超过5英尺/秒。最小开启压力不小于0.5 psi。
　　General Installation Information: Swing Check Ball Valves are designed for horizontal installations, but may be installed in up-flow only vertical position. The Check valves MUST be installed with the valve's FLOW arrow pointing in the direction of the flow and with the designated side up in horizontal installations. Do Not install Check Valve upside down. The Ball Valve portion may be rotated and installed in any position. Flow velocity should not exceed 5 ft./sec. Minimum opening pressure is less than 0.5 psi.

旋启止回球阀快速选型表
Quick-View Swing Check Ball Valve
Selection Chart

不适用于压缩空气或气体
NOT FOR USE WITH COMPRESSED
AIR OR GASES