Ductile iron dismantling joints are mainly based on the flange of the double flange connection to increase the connection. The flange is designed to meet the installation and disassembly of the valve pipe fittings developed in the lifting of heavy valves, in particular the regulation of the ball valve. The length of the double flange transmission joint will expand the gap between the valves in the pipeline. After the valve is fully installed, the limit expansion bolt can be installed to better install the valve. During the operation of the pipeline, the force transmission joint can be effective absorbs the radial displacement of the pipe, but does not absorb the axial displacement of the pipe.
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