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1. (WO2001023702) A DEVICE IN A SUBSEA SYSTEM FOR CONTROLLING A HYDRAULIC ACTUATOR AND A SUBSEA SYSTEM WITH A HYDRAULIC ACTUATOR

Pub. No.:    WO/2001/023702    International Application No.:    PCT/NO2000/000306
Publication Date: Apr 5, 2001 International Filing Date: Sep 18, 2000
IPC: E21B 33/035
Applicants: FMC KONGSBERG SUBSEA AS
LILLELAND, Svein
Inventors: LILLELAND, Svein
Title: A DEVICE IN A SUBSEA SYSTEM FOR CONTROLLING A HYDRAULIC ACTUATOR AND A SUBSEA SYSTEM WITH A HYDRAULIC ACTUATOR
Abstract:
The invention relates to a device in a subsea system for controlling a hydraulic actuator (1) which is connected to a supply line (2) for supply of a supply fluid to the actuator (1) and a return line (3) for removal of a return fluid from the actuator. The device (10) comprises a housing (11) and a body (29) which is movable in the housing (11), which together define a high-pressure chamber (14), which communicates with the supply line (2), and a low-pressure chamber (15), which communicates with the return line (3), and whose volume is a function of the pressure of the return fluid and the supply fluid. The invention further relates to a subsea system comprising such a hydraulic actuator (1) and a device (10). The invention is particularly applicable for the operation of subsea process valves.