Patent ID: 7533909

Claim:
A tube connection device for connecting a tube to a fluid system wherein, a connection element ( 7 ) defines a bore ( 10 ) and includes a connection surface ( 6 ); a tube ( 1 ) has a front element ( 2 ) on at least one end, said front element including a frontal sealing surface ( 3 ); a fitting ( 5 ) surrounds said tube ( 1 ) and urges said sealing surface ( 3 ) into sealing contact with said connection surface ( 6 ) of said connector element; at least one separate pressure element ( 13 ), which at least partially surrounds said tube ( 1 ), is provided between said fining ( 5 ) and said front element; and said fitting ( 5 ) acts on the front element through the pressure element ( 13 ) and presses the sealing surface ( 3 ) against the connection surface ( 6 ) wherein the coefficient of friction μ1 of the contact between sealing surface ( 3 ) and connection surface ( 6 ) is greater than the coefficient of friction μ2 of the contact of pressure element ( 13 ) and front element and is greater than the coefficient of fiction μ3 of the contact of fitting ( 5 ) and pressure element ( 13 ) and wherein said fitting ( 5 ) is a screw fitting and said bore ( 10 ) is threaded to receive said fitting, said fitting includes an end in contact with said pressure element ( 13 ) and said pressure element has a surface in contact with said front element ( 2 ).