Telescoping cover for a threaded rod

A plate heat exchanger comprising

• a head;
• a housing having a driving mechanism;
• a frame disposed between the head and housing;
• a pack of heat exchange plates;
• a follower configured to slide along the frame and compress the pack between the follower and the head, the follower having a nut, the nut having internal threads;
• a first tie bar disposed between the head and the housing, the first tie bar having external threads configured to mate with the internal threads of the nut, the driving mechanism being configured to rotate the first tie bar, wherein the follower is configured to translate along the first tie bar in response to rotation of the first tie bar;
• a first telescoping cover disposed between the head and the follower, the first telescoping cover being configured to cover the first tie bar and control the ingress and egress of fluid coming into contact with the first tie bar disposed within the first telescoping cover;
• and
• a ferrule assembly disposed between each pair of adjacent segments of the plurality of segments and the ferrule assembly being configured to provide a sliding seal to facilitate one segment of the pair of segments sliding into the other segment of the pair of segments, the first telescoping cover comprising a first end, a second end, and a plurality of segments, each segment including a body,
• the ferrule assembly further comprising an inner ferrule, an outer ferrule, and an O-ring seat disposed in one or both of the inner ferrule and outer ferrule and a corresponding O-ring disposed in the O-ring seat, the inner ferrule being affixed to an end of a respective segment of the plurality of segments and configured to slide within an inner surface of the body of an adjacent segment of the plurality of segments, the outer ferrule being affixed to an end of a respective segment of the plurality of segments and configured to slide along an outer surface of the body of an adjacent segment of the plurality of segments.