F - Mech Eng,Light,Heat,Weapons – 16 – L
Patent
F - Mech Eng,Light,Heat,Weapons
16
L
285/53
F16L 19/08 (2006.01) F16L 19/02 (2006.01)
Patent
CA 1202341
ABSTRACT OF THE DISCLOSURE A union joint for jointing pipes comprises a union head having a male screw thread formed on the outer peripheral surface of axiall inner and portion thereof and provided at its end with a seat member made of a non-ferrous material, a union tail piece having a collar on the outer peripheral surface of the inner axial end thereof and provided at its end with a sealing surface constituted by a part of a sphere having an arcuate axial cross-section, and a union nut provided at its front inner portion with a female screw thread and at its rear portion with an inwardly projecting jaw. The union nut is adapted to be screwed to the union head through screwing engagement between the female screw in the union nut and the male screw on the union head while keeping the jaw of the union nut in engagement with the collar of the union tail piece thereby to bring the seat member on the union head and the sealing surface on the union tail piece into close contact with each other to form a seal for preventing leak of a fluid in the joint. An annular groove is formed in the axially inner end portion of the union head adjacent to the inner periphery of the union head, the annular groove having a substantial axial depth and receiving a substantially ring-shaped seat member, the inner wall of the union head defining the annular groove being knurled and flared at at least end portion portion thereof over the entire circumference thereof and caulked onto the seat member. The seat surface of the seat member for contact with the sealing surface on the union tail piece being tapered to diverge towards the axially inner end at a taper angle of between 95° and 110°.
429997
Wanda Nobuo
Watanabe Nobuyuki
Gowling Lafleur Henderson Llp
Hitachi Metals Ltd.
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