适用于特殊应用或尖端技术应用，类型H无固定器Duo-Chek阀门采用一体式阀体结构，没有带销钉的固定器贯穿阀体。
　　For critical applications, Style H retainerless Duo-Chek valves feature a one-piece body with no pin retainer penetration through the body.
　　这种高性能阀门与其它Duo-Chek II阀门相同的内部结构，具有所有独特的特征和优点。
　　These high performance valves utilize the same internal design of other Duo-Chek II valves with all the unique features and advantages built into them.

这个视图旋转90o，显示阀门 实际的运行位置。用于水平 流向时，销钉必须垂直向上。 This view is rotated 90o to show the actual operating position of the valve. The pin must be vertical for horizontal flow.

　　由于无固定器Duo-Chek II阀门没有贯穿阀体的部件，因此也就消除了穿过阀体而可能导致泄露的通道。这使得无固定器Duo-Chek II阀门特别适用于下列特殊应用：
　　Because Retainerless Duo-Chek II valves have no body penetrations potential leak paths through the valve are eliminated. This makes the Retainerless Duo-Chek II ideally suited to meet the following critical service applications:

• 烃加工
  Hydrocarbon processing
• 化学处理与加工
  Chemical processing
• 任何与火灾危险或环境安全有关的行业
  Any industry concerned with fire hazards or environmental safety

　　Duo-Chek类型H对夹式止回阀的主要特征包括：
　　Key features of the Duo-Chek Style H wafer check valve include:

• 有多种多样的阀体和阀瓣材质选项
  A wide selection of body and plate materials
• 可选择金属对金属密封或弹性密封
  A choice of metal-to-metal or resilient sealing

• 全系列压力等级和通径
  A full range of pressure classes and sizes
• 多种连接端口
  A variety of end connections
• 设计结构符合ANSI, API, BS和DIN压力等级
  Designs available in ANSI, API, BS and DIN pressure ratings
• 内部构件容易拆卸，适用于常规检测和维护程序下进行现场更换。
  Internals easily removed for field replacement under normal inspections and maintenance procedures

　　Duo-Chek先进的设计结构为用户提供了许多实用的好处，它将结构更加紧凑，重量更轻结合在一起，使得Duo-Chek类型H成为常规旋启式止回阀杰出的替代产品。
　　The advanced design of the Duo-Chek provides many operational benefits to the user, which combined with its more compact size and lower weight, make the Duo-Chek Style H an excellent alternative to a standard swing check valve.

　　引人注意的优点包括：
　　Remarkable advantages include:

• 独立的弹簧作用(DN150及以上通径)和大通径阀门的阀瓣悬挂结构
  Independent spring action (on 6" and larger) and plate suspension on larger valves
• 平面阀座的自由释放
  Free release flat seats
• 对于流体倒流或减速，弹簧有助于快速反应
  Springs provide superior response to flow reversal or deceleration
• 将水锤现象降到最小程度
  Minimal water hammer
• 与常规旋启式止回阀比较，能够节约采购成本和安装成本
  Savings in purchase price and installation costs compared to a conventional swing check valve
• 单阀体结构，没有阀腔
  Single body design with no body cartridge