Emergency disconnecter for fluid loading and unloading lines

摘要

An emergency line disconnecter for an LNG loading/unloading line or the like which is capable of accommodating bi-directional fluid flow comprises a pair of couplings 1,2 having sliders 16,17 within the fluid passageways in the couplings arranged such that a substantially uniform cross-sectional flow path is provided for the fluid and sealing devices 22,23,34, 35 are mounted on the sliders 16,17 to cut off fluid flow through the device, and such devices 34,35 are designed so as to be resiliently operable at the extremely low temperatures of LNG. To dissipate the fluid shock due to rapid closure of the device, a fluid shock absorber employing restrictive passageways may be used to slow the advance of the sliders to their cut-off positions.