Abstract: A wormwheel (1) has teeth (2) over at least a portion of its periphery. The teeth (2) are shaped such that the pitch diameter (5) is greater at one face (3) of the wormwheel than the other and does not increase along the path of the tooth from said one face (3) to the other face (4). Because of this tooth shaping the wormwheel may be cast and is thus suitable for mass production. Wormwheels of this type are particularly, but not exclusively, suitable for use in valve actuators. In order to facilitate the casting process the wormwheel is formed with only one integral bearing (10) and has an internally splined opening (8) in which can be received a bearing sleeve (18) which may also be adapted to receive the valve stem within its own axial opening (21). A variety of bearing sleeves suitable for use with different valve stems may be provided for cooperation with the same wormwheel thereby eliminating the need for special adaptors and reducing the number of parts required to construct a range of valve actuators.