Return bend pressure balance type expansion joint

The utility model belongs to the appurtenance field specifically is a return bend pressure balance type expansion joint. A bellows (3) and tee bend (5) that's a return bend pressure balance type expansion joint manages (1) including holding, is connected with the nozzle stub is proposed, one end that tee bend (5) were responsible for with bellows (3) connect, the person in charge's the other end is sealed by head (11), the cover has been put and has been strengthened neck area (1) on the branch pipe of tee bend (5), just enhancement neck area (12) and tee bend (5) branch pipe welded connection, the lower extreme of strengthening neck area (12) stretches out the cladding in the attachment weld outside of the tee bend person in charge with the branch pipe to both sides, and tee bend person in charge welded connection. The utility model discloses reduced the stress at three -way owner branch connection position, avoided high temperature hot wall working condition under the makeup weld the tee bend looks transversal welding seam fracture phenomenon that the system tee bend caused greatly in response to power.