·Flange connection valve: A valve with a flange on the valve body and a flange connection with the pipeline.
·Threaded connection valve: A valve with a threaded connection on the valve body. Valves with internal or external threads and threaded connections with pipes.
·Welded connection valves: valves with butt welding grooves or socket welding connections on the valve body.
·Clamp connection valve: A valve with a clamp on the valve body and connected to the pipeline by a clamp.
·Card sleeve connection valve: a valve connected to a pipe by a ferrule.
