PIPE JOINT, REFRIGERATION DEVICE, HEAT PUMP HOT WATER SUPPLY DEVICE, CLOSING VALVE, WATER SUPPLY PIPING, METHOD OF CONNECTING PIPING, AND IN-THE-FIELD PIPING METHOD

摘要

A pipe joint, a device using the pipe joint such as a refrigerant device, a method for connecting piping are provided, in which loss of a sleeve is prevented, workability in the pipe joining operation is enhanced, and the sealing performance of a joint portion is ensured. The sleeve is integrated with a nut before the nut is screwed into the joint body. When the nut is screwed in the joint body, the sleeve is cut off and separated from the joint body. When the nut is further screwed, the sleeve bites into the pipe, and the pipe is joined to the joint body.