A valve operating device (1) for operating a subsea valve (100), the valve operating device (1) comprises: —a housing (10); —thrust bearings (12) supported by the housing (10); —a chamber (20) within the housing (10), wherein the chamber (20) comprises a first part of a linear guide (21); —a rotational shaft (30) comprising a first end with an external interface (31) outside the chamber (20) and a second end inside the chamber (20), —a linear shaft (40) arranged within the chamber (20), the linear shaft (40) comprising a first portion (41) and a second portion (42), wherein the first portion (41) comprises threaded portion (43) connected to the threaded portion (34) of the rotational shaft (30) and wherein —the rotational shaft (30) comprises a pre-machined hole (36) extending over a part of an axial length of the rotational shaft (30).