Ball valve butt-joint structure

A ball valve butt-joint structure, comprising two ball valve assemblies coaxially butt-jointed, wherein each of the two ball valve assemblies comprises a valve body, a valve core and a valve stem, the valve core is movably disposed within the valve body, one end of the valve stem is disposed to pass through the valve body and is fixedly connected to the valve core, another end of the valve stem extends out of the valve body and is sleeved with a gear, a butt-joint end surface of each valve body is provided with a rack extending circumferentially, and the rack of one ball valve assembly of the two ball valve assemblies is configured to mesh with the gear of another ball valve assembly of the two ball valve assemblies;

• and
• at least one valve body has a limit pin elastically connected to the valve body, a butt-joint surface of at least another valve body is provided with a limit hole matching the limit pin, and the limit pin is movable axially relative to the valve body between a locked position in which the limit pin is inserted into the limit hole and an unlocked position in which the limit pin is disengaged from the limit hole.