Patent ID: 8156953

Claim:
A method for regulating a pressure in a hydraulic system for operating at least a first actuator in a subsea installation, the hydraulic system having a fluid supply line connected to a source of pressurized fluid at a remote location for delivering fluid at a constant pressure to the subsea installation, the method comprising: providing first and second control valves in the fluid supply line upstream of the first actuator, the first and second control valves being controlled by an electronic control unit; providing an accumulator in the fluid supply line between the first and second control valves; providing a first pressure sensor for measuring the pressure in the accumulator; if the pressure of the fluid in the accumulator is below a desired first pressure range for operating the first actuator, adding fluid from the source of pressurized fluid to the accumulator through the first control valve until the pressure of the fluid in the accumulator is within the desired first pressure range; and if the pressure of the fluid in the accumulator is above the desired first pressure range, releasing fluid from the accumulator through the second control valve to a fluid return line until the pressure of the fluid in the accumulator is within the desired first pressure range.