A fluid-damped valve comprises a body defining an internal cavity having an inlet for ingress of a fluid and an outlet for egress of the fluid, and a closure member having a narrowed end portion. The closure member is movably disposed within the internal cavity intermediate the fluid inlet and the fluid outlet. The valve includes a seat configured to sealingly receive the closure member. The seat defines a constricted portion of the internal cavity configured to non-sealingly receive the narrowed end portion and damp the flow of the fluid through the fluid-damped valve.

A fluid-flow control device includes a valve aperture and a mounting member arranged downstream of the aperture. A valve member, movably mounted on the mounting member, controls the flow of fluid through the aperture. A control volume, defined between the mounting member and the valve member receives a control fluid from a control fluid feed. A variable flow restrictor is rotatably arranged within a restriction volume of the control fluid feed such that a flow path connecting the inlet, and the outlet, of the restriction volume is defined between the restrictor and the wall of the restriction volume. The restrictor is axi-symmetric about its axis of rotation.