Valve assembly

A valve assembly for wellbore, downhole or intervention operations, the valve assembly comprising:

• a rotatable ball valve member having a passage formed therein;
• an actuator arrangement;
• and
• a linkage arrangement comprising a boot with a coupling to the valve member, the linkage arrangement connecting the valve member and the actuator arrangement,
• wherein actuation of the actuator arrangement reconfigures the valve assembly from a first configuration in which the passage is aligned or alignable with a first conduit to a second configuration in which the passage is misaligned or misalignable with the first conduit, so as to cut or sever one or more apparatuses present in the valve member passage prior to reconfiguration;
• and
• wherein the linkage arrangement is configured to convert a linear movement of the actuation arrangement to a rotational movement of the valve member, the linkage arrangement defining an arcuate path of the coupling relative to the valve member, the arcuate path defining a pivot axis of the coupling, the pivot axis being offset relative to a rotational axis of the valve member such that the path comprises an orbit of the coupling about the pivot axis such that the assembly is configured to apply a maximum cutting force at a particular phase or stage of the reconfiguration.