CAGE ASSEMBLY WITH THROTTLE RINGS

Abstract

The invention refers to a cage valve comprising a valve cover (20, 42, 62) and a valve cage, which latter comprises a retaining element (28, 54, 72) and a plurality of throttle elements (30) which are designed in the form of a hollow section. The invention is characterized in that the valve cage is connected to the valve cover (20, 42, 62).

Claims

1-9. (canceled)

10. Cage valve comprising a valve cover (20, 42, 62) and a valve cage, comprising: said valve cage includes a retaining element (28, 54, 72) and a plurality of throttle elements (30), said throttle elements include a hollow section; and, said valve cage is connected to said valve cover (20, 42, 62).

11. Cage valve according to claim 10, further comprising: said valve cage comprises a piston guide element (26, 50, 68), said retaining element (28, 54, 72) being fixed on said piston guide element (26, 50, 68).

12. Cage valve according to claim 11, further comprising: said retaining element (28, 54, 72) is connected to said piston guide element (26, 50, 68) by means of a screw thread in the form of a union nut (32).

13. Cage valve according to claim 11, further comprising: said retaining element (28, 54, 72) is connected to said piston guide element (26, 50, 68) by means of a connecting flange having at least two screws on the circumference thereof.

14. Cage valve according to claim 10, further comprising: said hollow sections are fixed axially and radially by said retaining element (28, 54, 72).

15. Cage valve according to claim 13, further comprising: said throttle elements (30) are fixed in the axial direction by said retaining element (28, 54, 72) and by said piston guide element (26, 50, 68).

16. Cage valve according to claim 11, further comprising: said piston guide element (26, 50, 68) has a flange screwed onto said valve cover.

17. Cage valve according to claim 10, further comprising: said retaining element includes an end, said end of said retaining element (28, 54, 72) which faces away from said valve cover (20, 42, 62) is a valve seat.

18. Cage valve according to claim 10, further comprising: said hollow section is a hollow cylinder.

19. Cage valve according to claim 18 wherein said hollow cylinder comprises throttle rings.

20. Cage valve according to claim 18 wherein said hollow cylinder comprises throttle disks (52, 70).

Description

[0020] Throughout the description, the claims and the drawings, those terms and associated reference signs are used as are listed in the List of Reference Signs which follows below. In the drawings,

[0021] FIG. 1 is a sectional view of a control valve,

[0022] FIG. 2 is a view of an enlarged detail of the control valve of FIG. 1,

[0023] FIG. 3 is a view of another embodiment of a control valve according to the invention, and

[0024] FIG. 4 is a view of yet another embodiment of a control valve according to the invention with an integrated valve seat.

[0025] FIG. 1 is a sectional view of a control valve 10 according to the invention. A control valve of this type comprises a drive 12, a valve rod 14 as well as a piston 16. Furthermore, the control valve 10 comprises a basic valve body 18 which is closed by means of a valve cover 20. Attached to the valve cover 20 is a cage assembly 22 which will be described in more detail below with reference to FIG. 2. The cage assembly 22 is designed in such a way that it extends over a valve seat 24 provided in the valve body 18. The cage assembly 22 has a throttle zone 22b and a piston guide zone 22a.

[0026] FIG. 2 is a view of an enlarged detail of the control valve 10 of FIG. 1. The enlarged detail shows the valve cover 20, the cage assembly 22, the basic valve body 18 in which the valve seat 24 has been inserted.

[0027] The cage assembly 22 comprises a piston guide element 26 and a retaining element 28. The retaining element 28 holds a plurality of throttle elements 30 which are used to influence the throttle characteristics of the cage valve in a modular manner. The retaining element 28 is cup-shaped and its end facing the piston guide element is provided with a shoulder via which the retaining element 28 can be screwed to the piston guide element 26 by means of a union nut 32. Furthermore, a rotation-locking device 33 is provided which is used to secure the retaining element against rotation relative to the piston guide element, by means of a thickened portion on the piston guide element and a recess in the retaining element. The throttle elements 30 are thus clamped between the piston guide element 26 and the retaining element 28 in the axial direction. The piston guide element 26 comprises a flange portion 26a through which the entire cage assembly 22 is screwed to the valve cover 20. The valve cover 20 can thus be used to insert the entire cage assembly 22 into the basic valve body 18. In this process, the cage assembly 22 is plugged onto the valve seat 24.

[0028] This provides an easy way to mount a prefabricated valve cage of a modular structure in a basic valve body.

[0029] FIG. 3 is a view of a detail of another embodiment of an inventive control valve 40 which comprises a valve cover 42 and a cage assembly 44 as well as a valve seat 48 inserted in a valve housing 46. The cage assembly comprises a piston guide element 50 and throttle disks 52 which are fixed on the piston guide element 50. The throttle disks 52 are fixed in position axially and radially on the piston guide element 50 by means of a retaining element 54. In the embodiment illustrated, the retaining element is a centrally mounted hollow-bored screw of a screw connection. Alternatively, the retaining element is part of a flange connection. Alternatively, the retaining element can also be a part of a retaining ring connection. The piston guide element 50 likewise has a flange portion 50a by means of which the cage assembly 44 is attached to the valve cover 42. The cage assembly 44 is fitted on the valve seat 48 in a manner similar to the one of FIG. 1.

[0030] FIG. 4 is a view of a detail of yet another embodiment of an inventive control valve 60, comprising a valve cover 62, a cage assembly 64 as well as a basic valve body 66. The cage assembly 64 comprises a piston guide element 68 having a cylindrical widened portion on its end facing away from the valve cover for receiving the throttle disks 70 therein. Furthermore, the cage assembly comprises a retaining element 72 having an external thread allowing this element 72 to be screwed into the piston guide element 68.

[0031] In this embodiment, the retaining element 72 is designed as a valve seat which is adapted to be inserted into a corresponding recess provided in the valve.

LIST OF REFERENCE SIGNS

[0032] 10 control valve [0033] 12 drive [0034] 14 valve rod [0035] 16 piston [0036] 18 basic valve body [0037] 20 valve cover [0038] 22 cage assembly [0039] 22a piston guide zone [0040] 22b throttle zone [0041] 24 valve seat [0042] 26 piston guide element [0043] 26a flange region [0044] 28 retaining element [0045] 30 throttle element [0046] 32 union nut [0047] 33 rotation-locking device [0048] 40 control valve [0049] 42 valve cover [0050] 44 cage assembly [0051] 46 valve housing [0052] 50 piston guide element [0053] 50a flange region [0054] 52 throttle disk [0055] 54 retaining element [0056] 60 control valve [0057] 62 valve cover [0058] 64 cage assembly [0059] 66 basic valve body [0060] 68 piston guide element [0061] 68a flange region [0062] 70 throttle disk [0063] 72 retaining element