Flange coupling for connecting pipes for carrying refrigerant during refrigerating cycle

A pipe connection device for an end to end connection of pipes made of aluminum comprising:

• a pair of first and second flanges for holding respective pipes thereby, said flange defining connection surfaces in contact with each other and extending substantially at a right angle to longitudinal axes of the pipe, said flanges defining bores through which the respective pipes extend up to the respective connection surface, the respective pipes having annular projections engaging edges of the respective bores to prevent said pipes from being withdrawn from the facing connection surface;
• and
• means for tightening the first and second flanges so that the facing connection surfaces are engaged with each other;
• said first and second flanges being made of a non-conducting plastic material,
• each of said first and second flanges comprising a pair of separate flange sections having end surfaces which are parallel with respect to the longitudinal axes of the pipes and a recess for receiving the pipe, the flange sections being arranged so as to contact with each other at said faced end surfaces while said pipe is fitted to the recess, and at least one screw member which extends substantially transverse to the longitudinal axis of the pipe, said screw member connecting the flange sections to each other in such a manner that the respective pipe is fixed securely between the two flange sections.