 “加长阀体”结构的Duo-Chek
II阀门适用于非常迅速开启的应用场合。这种类型的应用通常与压缩气体或蒸汽有关，这种状况下封闭机械结构会产生容易导致损坏的爆发式开启。这种损坏可能会使阀门无法正常工作。有些反应缓慢的阀门，如旋启式止回阀和翻转式阀瓣止回阀，经常会因此而损坏。
The "Extended Body" version of the Duo-Chek
II was designed for extremely fast opening conditions. These types of
applications are generally associated with compressed gas or steam that
causes damage from the explosive opening effect on the closure mechanism.
This damage can render them inoperative. This is especially true with
slow response valves such as swing and titling disc check valves.
X类型阀体结构具有特殊的几何结构和阀瓣配置，使得每个阀瓣撞击在其撞击中心的止动销上。
The Style X body design has special geometry and
plate configuration to allow each plate to strike the stop pin in its
center of percussion. To absorb high impacts, the stop pin and hinge lugs
are oversized.
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典型应用包括可能会产生冲击现象的离心压缩机排放，空气分离装置，压缩机平行安装的管线，以及排气。类型X的Duo-Chek阀门通常不用于液体应用场合。
Typical applications include centrifugal compressor
discharge where compressors are subject to "surging," air separation
plants, pipelines where compressors are mounted in parallel, and steam
extraction. Style X Duo-Chek valves are generally not required for liquid
applications.
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