Control valve

1 . A control valve for regulating or controlling a cryogenic process medium, comprising a valve housing with a main body having a valve inlet and valve outlet, a valve seat arranged in the flow duct between the valve inlet and valve outlet, a valve cage arranged in the flow duct between the valve inlet and valve outlet, and a valve member which is movable in an axial direction with respect to the valve seat and valve cage and which is connectable to a control element rod of a drive via a drive rod,

wherein the valve housing has an extension body extending the main body in the axial direction and a valve cover which closes the extension body, the control element rod of the drive to which the valve member is connected to the drive rod being configured to sealingly pass through the valve cover,

wherein the control valve furthermore comprises a circulation barrier arranged in the valve housing and configured to prevent circulation of said cryogenic process medium in the extension body,

wherein the circulation barrier and the valve cage are in contact with each other via contact pressure surfaces which are formed so as to correspond to one another and are situated opposite one another in the axial direction, and in that the circulation barrier and valve cage that are in contact with one another via the opposing contact pressure surfaces, are jointly fixed in the valve housing via a fastener, and

wherein the components valve cage and valve seat, which form a structural unit, are connected to one another via a screw connection formed between the valve cage and the valve seat.

2 . A control valve according to claim 1 , wherein the valve cage has a cage-side stop surface and the main body of the valve housing has a housing shoulder formed to correspond thereto, via which the valve cage and the main body of the valve housing are in contact with one another, and in that the components circulation barrier and valve cage are held clamped between the fastener and the housing shoulder on the main body side.

3 . A control valve according to claim 2 , wherein the components valve seat and valve cage form a structural unit, and in that the circulation barrier and the structural unit comprising valve seat and valve cage are held clamped between the fastener and the housing shoulder.

4 . A control valve according to claim 1 , wherein the valve seat and the valve cage form a structural unit, and in that the valve seat has a seat-side contact surface and the main body of the valve housing has a main-body-side stop designed to correspond thereto, via which the structural unit comprising the valve cage and the valve seat, as well as the main body of the valve housing are in contact with one another, and in that the components circulation barrier and the structural unit comprising the valve cage and the valve seat are held clamped between the fastener and the main body-side stop.

5 . A control valve according to claim 1 , wherein the valve cage has an internal thread, and the valve seat has a corresponding external thread.

6 . A control valve according to claim 1 , wherein the valve housing has an internal thread in the region of the circulation barrier, and in that the fastener is designed as a threaded sleeve having an external thread corresponding to the internal thread.

7 . A control valve according to claim 1 , wherein the main body has a greater wall thickness compared to the extension body.

8 . A control valve according to claim 7 , wherein the main body and the extension body are formed in one piece, wherein, as viewed in the axial direction, the recess of the wall thickness with respect to the main body defines an extension-side end thereof and with respect to the extension body, the recess defines a base-body-side beginning thereof.

9 . A control valve according to claim 1 , wherein the main body and the extension body are designed in two parts, and as viewed in the axial direction, the main body has an extension-side end facing the extension body and the extension body has a base-body-side beginning facing the main body, via which the base and extension bodies are connected to one another in a materially and/or positively and/or non-positively contacting manner.

10 . A control valve according to claim 8 , wherein viewed in the axial direction, the main body of the valve housing has a height (h 1 ) starting from the valve seat to the extension-side end, and the extension body has a height (h 2 ) starting from the base-body-side beginning to the cover-side end, with the main body and the extension body being dimensioned with respect to their component heights such that the following applies:

Height (h 2 ) of the extension body ( 12 - 2 )≥2×height (h 1 ) of the main body.

11 . A control valve according to claim 1 , wherein as viewed in the axial direction, the circulation barrier is arranged in the region of the main body.

12 . A control valve according to claim 1 , wherein as viewed in the axial direction, the circulation barrier is arranged in the region of the extension body.

13 . A control valve according to claim 9 , wherein viewed in the axial direction, the main body of the valve housing has a height (h 1 ) starting from the valve seat to the extension-side end, and the extension body has a height (h 2 ) starting from the base-body-side beginning to the cover-side end, with the main body and the extension body being dimensioned with respect to their component heights such that the following applies:

Height (h 2 ) of the extension body ( 12 - 2 )≥2×height (h 1 ) of the main body.

14 . A control valve according to claim 1 , wherein the circulation barrier is configured to be bell-shaped so as to guide the control element rod.