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.