Pipe fitting having a non-metallic sealing member

摘要

A pipe fitting comprising interconnected threaded male and female members. A fitting element in the form of a non-metallic ring is defined by a tubular body, a radial flange and a sealing portion extending from the radial flange. The tubular body of the ring is adapted to be inserted into the male member such that the radial flange overlies the end wall of the male member. The outer periphery of the sealing portion of the ring has a diameter greater than the minor diameter of the threads of the female member. As a result, a part of the sealing portion is caused to be captured between opposed thread flanks of the male and female members upon make-up of the fitting thus providing for enhanced sealing at the threads of the fitting. In addition, the ring serves to isolate the end wall of the male member from contact with fluid thus making the fitting advantageous in the embodiment in which a non-metallic lining is provided in the male member.