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Open Access Research on the pressure compensation for the underwater hydraulic motor

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Considering the influence of underwater ambient pressure (UAP) on underwater hydraulic motors (UHMs), and utilising the state-of-the-art of pressure compensation of underwater hydraulic systems (UHS), this paper proposes a pressure compensation technique for the UHS where the hydraulic power unit is installed inside a deep diving submersible or a submersible drilling platform with atmospheric pressure, some actuators of which are directly surrounded by seawater and others are installed inside it. An underwater ambient-pressure-compensation valve (UAPCV) has been developed. The pressure in the return line of the external sub-circuits of the UHS is compensated by this UAPCV, but not that of the internal subcircuits. Theoretical analysis, simulation and experimental results show that reliable pressure compensation can be ensured with a small flowrate by the UAPCV. The operational performance of the UHM is further improved after its leakage pressure and return pressure are compensated.

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Keywords: PRESSURE COMPENSATED VALVE; UNDERWATER AMBIENT PRESSURE; UNDERWATER HYDRAULIC SYSTEM

Document Type: Research Article

Publication date: November 1, 2005

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