Fluid flow control apparatus having a throttling arrangement

Abstract

A fluid flow control apparatus having an adjustable throttling arrangement for controlling the flow of fluid between working cylinders associated with sections of an articulated vehicle, has a housing which is essentially symmetric in shape. Two working connections are formed at symmetrically opposite ends of the housing and connect to the working cylinders. Two passageways, formed in the housing to connect the two working connections, are also symmetrically formed and are approximately equivalent in length. The first passageway uses a check valve arrangement to restrict fluid flow from the first working connection to the second working connection while the second passageway uses a similar check valve arrangement to restrict fluid flow in the opposite direction. The two passageways interconnect at a crossover duct which acts as a guide for the throttling arrangement. A slide member, having a throttle face formed on a circumferential surface, is movable in relation to a throttle surface formed on the housing such that, a restriction is introduced to the fluid flow in both the first and second passageways. A motor drive/transmission arrangement controls movement of the slide in response to bending parameters established for the articulated vehicle. A relief valve provided in the first passageway, bypasses the throttling arrangement should an excessive fluid pressure occur.