A valve operating device for operating a subsea valve , the valve operating device comprises: - a housing ; - thrust bearings supported by the housing , wherein the thrust bearings comprises a connection part (11,11';11"); - 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 which is outside the chamber and the housing and a second end inside the chamber , the rotational shaft comprises a first portion that comprises a connection part (38,38';38") which is connected to the connection part of the thrust bearings forming a connection therebetween which allows rotational movement of the rotational shaft while preventing axial movement of the rotational shaft relative to the housing , a second portion comprising a threaded portion , and an intermediate portion between the first portion and the second portion , and wherein the second portion is arranged 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 interacting with the threaded portion of the rotational shaft forming a threaded connection translating rotational movement of the rotational shaft to linear movement of the linear shaft , and the second portion is connectable to a valve stem operating the valve , wherein the linear shaft also comprises a second part of the linear guide , the first part and the second part of the linear guide prevent rotation of the linear shaft relative to the housing , and wherein - the rotational shaft comprises a pre-machined hole extending from the first end of the rotational shaft and along a center axis of the rotational shaft over a part of an axial length of the rotational shaft . - a housing ; - thrust bearings supported by the housing , wherein the thrust bearings comprises a connection part (11,11';11"); - 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 which is outside the chamber and the housing and a second end inside the chamber , the rotational shaft comprises a first portion that comprises a connection part (38,38';38") which is connected to the connection part of the thrust bearings forming a connection therebetween which allows rotational movement of the rotational shaft while preventing axial movement of the rotational shaft relative to the housing , a second portion comprising a threaded portion , and an intermediate portion between the first portion and the second portion , and wherein the second portion is arranged 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 interacting with the threaded portion of the rotational shaft forming a threaded connection translating rotational movement of the rotational shaft to linear movement of the linear shaft , and the second portion is connectable to a valve stem operating the valve , wherein the linear shaft also comprises a second part of the linear guide , the first part and the second part of the linear guide prevent rotation of the linear shaft relative to the housing , and wherein - the rotational shaft comprises a pre-machined hole extending from the first end of the rotational shaft and along a center axis of the rotational shaft over a part of an axial length of the rotational shaft . <EOS>