| 摘要 |
<p>A tube fitting (A) has: a body (10) having a bore (12) for receiving a tube end (15) and includes a tapered mouth (14) at one end of the body; a drive member (30) having a threaded engagement with the body and having a drive surface; a first ferrule (16) having a tapered first end (20) that extends into the tapered mouth of the body and having a second end (25) with a tapered recess that axially extends toward the first end; and a second ferrule (22) having a tapered first end (24) that extends into the tapered recess (24) of the first ferrule, and having a driven surface (28) on a second end (26) thereof that engages the drive member drive surface (32); the first ferrule (16) having an outer generally conical surface that forms the tapered first end and forms a seal with the tapered mouth when the fitting is assembled and tightened. The fitting includes a vent (100) in the form of a hole, bore or other fluid passageway in the drive member to relieve pressure when the drive member (30) is at least partly loosened from the body.</p> |
