Pressure differential lockout system and calibration method

Abstract

A pressure differential lockout system for a door separating first and second regions comprises a piston assembly, a follower linkage, and a fluid conduit. The follower linkage is mechanically coupled with a latch release handle of the door. The piston assembly includes a piston and a piston housing collectively defining an interior chamber. The fluid conduit provides fluid communication between the first region and the interior chamber. The piston is translatable along a translation axis relative to the piston housing responsive to a pressure differential between the interior chamber and the second region. The piston defines a channel that is parallel to the translation axis and that accommodates a follower component of the follower linkage. The channel inhibits rotation of the follower linkage within a first translation range of the piston and enables rotation of the follower linkage within a second translation range of the piston.