Patent ID: 6134893
Filing Date: 2000-10-24
Classification: F16L,F17C,Y02E,Y10S

Abstract:
A swivel bayonet joint for transferring cryogenic fluids, comprising:a. a male bayonet joint including an insertion stem having an insertion jacket surrounding and co-axial with a male inner line and secured to the male inner line at an insertion end of the stem, and a first swivel clamp means secured to the insertion jacket adjacent a clamp end of the stem; andb. a female bayonet joint including an outer jacket surrounding and co-axial with a receiving sleeve, a line end of the receiving sleeve being secured to a female inner line surrounded by and co-axial with the outer jacket, and a second swivel clamp means secured adjacent a clamp end of the receiving sleeve for clamping to the first swivel clamp means to secure the male and female bayonet joints together in a swivel relationship, so that the joints may swivel in relation to each other about an axis parallel to flow of the cryogenic fluid through the male and female inner lines, wherein the insertion stem is dimensioned to establish a high tolerance fit within the receiving sleeve along a first axial length from the clamp end to the insertion end of the stem, the first axial length being a length sufficient for formation of a vapor trap of cryogenic fluid along the first axial length between its insertion end and the clamp end of the receiving sleeve, so that the cryogenic fluid cannot move beyond the vapor trap to cool mechanical components of the first and second clamp means.