Abstract: An assembly of a servo pump and a hydraulic motor. The assembly has a housing which contains the pump and the motor. The motor has a rotating body which rotates under the motive power of a pressurised motor liquid flow. The motor has a high pressure region which receives the pressurised motor liquid flow, and a low pressure region through which the motor liquid flow leaves the motor. The pump also has a rotating body. The pump has a low pressure region which receives servo liquid flow to be pumped by its rotating body, and a high pressure region through which pressurised servo liquid flow leaves the pump. Each rotating body is mounted on a respective journal.

Abstract: An assembly of a servo pump and a hydraulic motor. The assembly has a housing which contains the pump and the motor. The motor has a rotating body which rotates under the motive power of a pressurised motor liquid flow. The motor has a high pressure region which receives the pressurised motor liquid flow, and a low pressure region through which the motor liquid flow leaves the motor. The pump also has a rotating body. The pump has a low pressure region which receives servo liquid flow to be pumped by its rotating body, and a high pressure region through which pressurised servo liquid flow leaves the pump. Each rotating body is mounted on a respective journal.

Abstract: A leaf seal 10 for location between a higher-pressure region and a lower pressure region of a rotary machine is configured so that radial movement of the free ends of the leaves 20 during operation of the rotary machine affects the aerodynamic forces acting upon the leaves 20. In particular, the housing 28 for the leaves 10 and the leaves themselves are part-conically formed such that when the free ends of the leaves are moved from their resting position, for example during shaft whirling, the gaps 34 and 36 between the upstream edge 21 of the leaf and the inner surface of the adjacent housing side-cheek 30, and between the downstream edge 22 of the leaf and the inner surface of the adjacent housing side-cheek 32, are altered. This alteration of the gaps can be used to provide improved control over the aerodynamic forces acting upon the leaves 20.