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.
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
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