A motor and a pump barrier fluids pressure regulation system for a subsea motor and pump module is disclosed. The pressure regulation system comprises—a barrier fluid circuit (10) providing fluid flow communication from a hydraulic fluid supply (8) to a first cavity in the motor and pump module,—a pressure controlled flow control valve (9) controlling the supply of hydraulic fluid to the barrier fluid circuit (10);—a second cavity arranged to receive hydraulic fluid from the hydraulic fluid supply via the first cavity, and—a pilot pressure circuit (11) comprising means for detecting and returning to the pressure controlled flow control valve (9) a differential pressure over a flow restriction (7; 13) connecting the first and second cavities.
https://app.acclaimip.com/pdf/TnDfBuYlZI5kcN9jAyVkgg863qDnaDrVlzDxX08/US20130164152A1
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