Neg
Improperly sealed flexible connections may pose pollution risks due to the intrusion of outside air
Leaking connectors draw in air from outside the pipeline, reducing material transport efficiency.
Negative pressure can also cause soft connections to be sucked in, affecting material flow

Design recommendation: Flexible connection length less than L ≤ flexible connection diameter D
Negative pressure support ring: Add a support ring in the middle of the flexible connection so that L ≤ D
Multilayer composite materials are used
