Patent ID: 7195287
Filing Date: 2007-03-27
Classification: F16L

Abstract:
1. A pipe fitting for liquid or steam, which includes a pipe fitting member having a head and an internal thread on an inner surface of said head, said pipe fitting further comprising: an elastic sealing ring, which contacts an inner end face of said head; a locating sleeve, which is placed around said sealing ring; an internally teethed lock ring which is located on an outer end face of said locating sleeve; an inner ring located outside said internally teethed lock ring, which has an inner surface matching with an outer surface of a pipe to be coupled, and an outer surface on which external threads are formed, and which is formed with a tapered surface toward said internally teethed lock ring; an outer ring, which has an internal cylindrical surface on which threads are formed for matching the external threads on said inner ring, and an external cylindrical surface on at least a portion of which an external thread is formed for matching said internal thread of said head; wherein a pipe is connected to the pipe fitting by, inserting the pipe into the pipe fitting until a “click” is heard; and the pipe is released, by turning said inner ring at 180° with a special wrench.