Abstract: A valve assembly for a pipeline has a rotatable sleeve within a chamber which houses obturator means such as a check valve assembly. The chamber and sleeve have through passages which can be brought into and out of register by rotating the sleeve. Thus the chamber can be isolated from the pipeline, and the obturator can be serviced and/or removed and replaced.
Abstract: A ball valve assembly comprising: a body providing a socket and flow ports communicating therewith; and a core unit comprising a core assembly adapted to be releasably inserted into said socket, the core assembly having a through passage arranged to communicate with said flow ports, and a rotatable ball member within the core assembly, said member having a through passage such that rotation moves it into and out of communication with the passage in the core assembly.