Pipe joint, packing ring, and method for mounting pipe joint

A method for mounting a pipe joint which seals a space between a containing section of a pipe or a pipe joint body into which a pipe to be joined is inserted and an outer peripheral surface of the pipe to be joined by a packing ring, the method comprising:

• a first step of fitting and mounting the packing ring in the containing section at a rear thereof of the pipe or the pipe joint body and positioning the packing ring with respect to the containing section;
• a second step of inserting the pipe to be joined into the pipe or the pipe joint body through the containing section;
• a third step of moving a pressing ring fitted over the pipe to be joined toward the pipe or the pipe joint body;
• and
• a fourth step of bending a rear end of the packing ring into the rear of the containing section by pressing by the pressing ring and creating a sealed state by compression caused by deformation of the bending.

A pipe joint which has a pipe or a pipe joint body into which a pipe to be joined is inserted, a pressing ring fitted over the pipe to be joined, a lock ring fitted onto an inner peripheral surface of the pressing ring, a tightening element capable of operating and moving the pressing ring toward the pipe or the pipe joint body, and a packing ring which is compressed by being pressed by the pressing ring that is moved by the operation of the tightening element and seals a space between an inner peripheral surface of the pipe or the pipe joint body and an outer peripheral surface of the pipe to be joined, wherein

• a slide piece arranged between the lock ring and the packing ring has a body section extending in a pipe peripheral direction, and a projection section which projects from the body section to the outer peripheral side thereof and extends in a pipe axis direction to be received by the pipe or the pipe joint body from the pipe axis direction,
• on the inner peripheral surface of the pressing ring, a temporary retaining section having a rear surface capable of receiving a back surface of the projection section from the pipe axis direction and an introducing section which is located toward a rear thereof from the temporary retaining section in the pipe axis direction and allows introduction of the projection section are formed in different positions in the pipe peripheral direction.

A method for mounting a pipe joint which includes a pipe or a pipe joint body into which a pipe to be joined is inserted, a pressing ring fitted over the pipe to be joined, a lock ring fitted onto an inner peripheral surface of the pressing ring, a tightening element capable of operating and moving the pressing ring toward the pipe or the pipe joint body, and a packing ring which is compressed by being pressed by the pressing ring that is moved by the operation of the tightening element and seals a space between an inner peripheral surface of the pipe or the pipe joint body and an outer peripheral surface of the pipe to be joined, the method comprising:

• an insertion step in which a slide piece arranged between the lock ring and the packing ring is received by the pipe or the pipe joint body and the pressing ring from a pipe axis direction, the tightening element is tightened to temporarily mount the pipe joint, and the pipe to be joined is inserted into the pipe or the pipe joint body;
• a releasing step in which the slide piece is slid in a pipe peripheral direction to release the reception of the slide piece by the pressing ring in the pipe axis direction;
• and
• a tightening step in which, after the releasing step, the tightening element is further tightened to move the pressing ring toward the pipe or the pipe joint body.