A SUBSEA VALVE ACTUATOR APPARATUS

摘要

A subsea valve actuator apparatus is disclosed including a housing and a cover for sealing the enclosure A worm wheel within the housing actuates the valve A pressure compensator within the housing, defining a chamber, includes a piston slidably disposed within the chamber which separates the chamber into a first and a second cavity The first cavity is in fluid communication with the seawater disposed outside the enclosure and the second cavity is in fluid communication with the lubricant disposed within the enclosure A pressure differential between the pressure of seawater and the pressure of the lubncant slides the piston within the chamber so that the pressure differential of the first cavity relative to the second cavity is reduced to zero such that the pressure of the lubricant is maintained at substantially the same pressure as the pressure of seawater so that a pressure difference across the seal is minimized