Fmc Kongsberg Subsea As

Technipfmc Norge As

Øivind Rokne

Heyn Halfdan Magnus

Geir Tandberg

A valve operating device () for operating a subsea valve (), the valve operating device () comprises:—a housing ();—thrust bearings () supported by the housing ();—a chamber () within the housing (), wherein the chamber () comprises a first part of a linear guide ();—a rotational shaft () comprising a first end with an external interface () outside the chamber () and a second end inside the chamber (),—a linear shaft () arranged within the chamber (), the linear shaft () comprising a first portion () and a second portion (), wherein the first portion () comprises threaded portion () connected to the threaded portion () of the rotational shaft () and wherein—the rotational shaft () comprises a pre-machined hole () extending over a part of an axial length of the rotational shaft ().

Valve operating device and method of overriding a malfunctioning valve operating device

It is described a subsea electric actuator () operating a linear valve (), the actuator () comprising a roller-screw () for translating a rotational movement of a motor () to a linear movement of a gate rod () operating the valve (), the actuator () comprising: &#x2014;an actuator housing (); &#x2014;an outer roller screw part (') rotationally connected to the motor () and comprising internal threads forming a first part of a first connection (), &#x2014;an inner roller screw part (&#x2033;) comprising external threads forming a second part of the first connection () and being arranged inside the outer roller screw part (&#x2032;), a surface of the inner roller screw part (&#x2033;) having a first interface forming a first part of a second connection (&#x2033;) connecting the inner roller screw part (&#x2033;) to a non-rotational part of the actuator (), the second connection (&#x2033;) is configured to rotationally lock the inner roller screw part (&#x2032;) giving linear movement of the inner roller screw part (&#x2033;) when the outer roller screw (&#x2032;) is rotated, &#x2014;a gate rod () arranged axially movable inside the inner roller screw part (&#x2033;), the external surface of the gate rod () comprising an interface forming a first part of a third connection (&#x2033;), &#x2014;an override housing () arranged outside the gate rod () and adjacent the inner roller screw part (&#x2033;) forming an axial stop for the inner roller screw part (&#x2033;), the override housing () comprising an interface forming a second part of the third connection (&#x2033;), and wherein, when the third connection (&#x2033;) is connected, the inner roller screw part (&#x2033;) is locked to the gate rod () such that the gate rod () follows any axial movement of the inner roller screw part (&#x2033;), and when the third connection (&#x2033;) is disconnected, the gate rod () is allowed to move in the axial direction relative the inner roller screw part (&#x2033;) such that the linear valve () can be operated independently of the motor (), outer roller screw part (&#x2032;) and inner roller screw part (&#x2033;). It is further described a method of performing override of a subsea electric actuator ().

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Notodden, Norway

Øivind Rokne