高度低、结构紧凑的真活接2000球阀功能最丰富，对空间要求最小。完全可维护的阀门腔还能够与美国斯毕尔公司活接头2000壁厚Schedule 80管道活接头相配合。无论是阀门还是活接头都采用锯齿螺纹活接头螺母，强度更佳。所有球阀都配置美国斯毕尔公司自我调节浮动阀座结构，使用寿命更长；还配置带双重O形环阀杆密封的美国斯毕尔公司Safe-T-Shear®阀杆，确保阀杆不会受到流体的污染，以防阀门被损坏。还可提供抗化学品和耐腐蚀PVC或CPVC材质材质，连接端口为承插、法兰或美国斯毕尔公司专利特别加固（SR）螺纹。
　　The Low profile, compact design of True Union 2000 Ball Valves provides maximum versatility with minimum space requirements. Fully serviceable valve cartridge also mates with Spears® Union 2000 Schedule 80 pipe unions. Both valves and unions utilize Buttress Thread union nuts for superior strength. All ball valves feature Spears® self adjusting Floating Seat design for extended service, and Spears® Safe-T-Shear® Stem with double O-ring stem seals for assurance of fluid containment in case of inadvertent valve damage. Available in chemical and corrosion resistant PVC or CPVC with socket, flanged or Spears® Patented Special Reinforced (SR) threaded.
　　执行机构组件包包括用于阀门/执行器对齐和支撑在任何位置的聚丙烯阀门安装支架。高级气动执行器是气-到-气（双作用；备选件为弹簧复位）执行器，配置一对活塞齿条和齿轮，可调节止动位置，并永久性润滑。强制手动操作装置是标准配置。外壳是硬阳极化铝，环氧树脂涂敷铝盒盖。
　　Actuated package includes polypropylene valve mounting bracket for accurate valve/actuator alignment and support in any position. Premium pneumatic actuator is an Air-to-Air (Double Acting; optional Spring Return) featuring twin piston rack and pinion operation with adjustable stops, and permanent lubrication. Manual override is standard. Housing is hard anodized aluminum with epoxy coated aluminum end caps.

工程规格说明书范文
Sample Emgineering Specification

　　所有球阀应该是气动驱动真活接2000类型球阀，其结构材料采用PVC类型I分类12454或CPVC类型IV分类23447。所有O形环材质应该是EPDM或Viton®。所有阀门应该配置Safe-T-Shear®阀杆和双重O形环阀杆密封。所有阀门活接头螺母应该采用锯齿螺纹。所有密封托架应该采用Safe-T-Blocked®商标的托架。所有阀门部件应该是可更换的。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23^oC条件下，所有DN15至DN50阀门压力额定值应该是235 psi，所有DN65至DN150阀门和所有法兰阀门压力额定值应该是150 psi。气动执行器应该在工厂安装，双活塞，齿条和齿轮结构并带可调节止动装置。工作方式应该是气-到-气（双作用），气源压力为80 psi。所有安装紧固件材质应该是不锈钢。执行器还应该配置[从所列备选件清单中选择]，并由美国斯毕尔制造公司制造。
　　All ball valves shall be pneumatic actuated True Union 2000 type constructed from PVC Type I Cell Classification 12454 or CPVC Type IV Cell Classification 23447. All O-rings shall be EPDM or Viton®. All valves shall have Safe-T-Shear® stem and double O-ring stem seals. All valve union nuts shall have Buttress threads. All seal carriers shall be Safe-T-Blocked®. All valve components shall be replaceable. All valves shall be Certified by NSF International for use in potable water service. All ¹/₂" through 2" valves shall be pressure rated at 235 psi and all 2¹/₂" through 6" and all flanged valves shall be pressure rated at 150 psi for water at 73^oF. Pneumatic Actuators shall be factory installed, dual piston, rack & pinion design with adjustable stops. Operation shall be Air-to-Air (double acting) for 80 psi supply pressure. All mounting fasteners shall be stainless steel. Actuator shall be equipped with [selected options list] as manufactured by Spears® Manufacturing Company.