Abstract: A chain conveyor assembly wherein the conveyor chain is constructed to enable the chain to be flexed in two dimensions, e.g., about horizontal and vertical axes, and is designed to convey heavy loads in a stable manner despite the use of a simple and economical conveyor chain. In accordance with a preferred embodiment, the chain conveyor assembly is comprised of a conveyor chain that is formed of a series of wheel units, a guide track arrangement providing surfaces upon which wheels of the wheel units ride, a drive arrangement for driving the conveyor chain, and self-supporting trays for conveying of articles thereon. Each of the trays is coupled to a drive link arrangement that is used to interconnect successive wheel units together and by which the conveyor chain is driven by the drive arrangement.

Abstract: An apparatus is disclosed for subjecting a test valve actuator to torque loads which simulate the torque loads an actuator would be expected to experience in field operation when opening and closing a butterfly-type valve in a fluid conduit. The apparatus includes a frame supporting both a drive shaft and a tail shaft mounted for rotation about horizontal axis of rotation. The test actuator is mounted on the frame and coupled to the drive shaft for rotating the shaft 90.degree. about its axis. A sprocket fixed to the drive shaft is connected by a link chain to a sprocket fixed to the tail shaft. The sprockets are selected to have a 3 to 1 gear reduction ratio with the tail shaft rotating 3 degrees for each degree of rotation of the tail shaft. A mass depending from the tail shaft generates a torque load at the tail shaft equal to one third the dynamic torque load for corresponding positions of the actuator.