Sealing device for a sealing system of a control valve, sealing system for a control valve and control valve

Abstract

Sealing device (100) for a sealing system (200) of a control valve (300), comprising a sleeve body (110) having an inner contact surface (111), an inner surface (117), an outer contact surface (112), and an outer surface (115), comprising a first sealing ring (120) having a first groove (121) and bearing on its radial outer side (122) against the inner contact surface (111), and comprising a second sealing ring (130) having a second groove (131) and bearing on its radial inner side (132) against the outer contact surface (112), wherein the outer contact surface (112) is radially offset from at least a partial region of the outer surface (115), and wherein the inner contact surface (111) is radially offset from at least a partial region of the inner surface (117).

Claims

[1] Sealing device (100) for a sealing system (200) of a control valve (300), with a sleeve body (110) having an inner contact surface (111), an inner surface (117), an outer contact surface (112) and an outer surface (115), with a first sealing ring (120) which has a first groove (121) and is in contact with the inner contact surface (111) on its radial outer side (122) and with a second sealing ring (130) which has a second groove (131) and is in contact with the outer contact surface (112) on its radial inner side (132), wherein the outer contact surface (112) is radially offset from at least a partial area of the outer surface (115) and wherein the inner contact surface (111) is radially offset from at least a partial area of the inner surface (117). [2] Sealing device (100) according to claim 1, characterized byin that the sleeve body (110) has a stepped taper (113) which is formed axially between the inner contact surface (111) and the outer contact surface (112) and at least partially forms the outer surface (115) of the sleeve body (110) and the inner surface (117) of the sleeve body (110). [3] Sealing device (100) according to at least one of claims 1 and 2, characterized by a first spacer ring (140), wherein the stepped taper (113) forms a first axial stop (118) for the inner contact surface (111), wherein the first spacer ring (140) bears against the first axial stop (118). [4] Sealing device (100) according to at least one of claims 1 to 3, characterized by a cross-sectionally L-shaped end ring (160) which bears against an axial end (114) of the inner contact surface (111), wherein a projection (161) of the end ring (160) engages in the sleeve body (110) and bears against the inner contact surface (111). [5] Sealing device (100) according to at least one of claims 1 to 4, characterized by a second spacer ring (150) and an outer sleeve (170) which is arranged axially fixed to the sleeve body, wherein the second spacer ring (150) bears axially against the outer sleeve (170). [6] Sealing device (100) according to claim 5, characterized by that the outer sleeve (170) is held axially fixed to the sleeve body (110) by means of a threaded connection. [7] Sealing device (100) according to at least one of claims 3 to 6, characterized by that the first spacer ring (140) and the first sealing ring (120) have a first common inner diameter (141) and that the inner surface (117) of the sleeve body (110) and the end ring (160) have a second common inner diameter (162). [8] Sealing device (100) according to claim 7, characterized bythat the first common inner diameter (141) is smaller than the second common inner diameter (162). [9] Sealing device (100) according to at least one of claims 4 to 8, characterized by that the first sealing ring (120) axially abuts the first spacer ring (140) which abuts the inner contact surface (111) and that the second sealing ring (130) axially abuts the second spacer ring (150) which abuts the outer contact surface (112). [10] Sealing device (100) according to at least one of claims 1 to 9, characterized by a first metallic spring ring (123) arranged in the first groove (121) and a second metallic spring ring (133) arranged in the second groove (131). [11] Sealing device (100) according to claim 10, characterized bythat a cross-sectional diameter of the first metallic spring ring (123) is greater than a width of the first groove (121), so that the first metallic spring ring (123) spreads the first sealing ring (120) in the region of the first groove (121) and a lateral wall (124) of the first groove (121) is pressed against the inner contact surface (111), and that a cross-sectional diameter of the second metallic spring ring (133) is greater than a width of the second groove (131), so that the second metallic spring ring (133) spreads the second sealing ring (130) in the region of the second groove (131) and a lateral wall (134) of the second groove (131) is pressed against the outer contact surface (112). [12] Sealing device (100) according to at least one of claims 10 and 11, characterized by that the first metallic spring ring (122) and the second metallic spring ring (132) are hollow rings. [13] Sealing device (100) according to at least one of claims 1 to 12, characterized bythat the first sealing ring (120) and the second sealing ring (130) are made of a plastic. [14] Sealing device (100) according to claim 13, characterized by that the plastic is PTFE. [15] Sealing device (100) according to at least one of claims 1 to 14, characterized by that the first sealing ring (120) and the second sealing ring (130) each have a substantially rectangular basic shape in a cross-section, so that the first sealing ring (120) can lie flat against the inner contact surface (111) and the first spacer ring (140) and the second sealing ring (130) can lie flat against the outer contact surface (112) and the second spacer ring (150). [16] Sealing device (100) according to at least one of claims 1 to 15, characterized by that the first sealing ring (120) has a larger cross-section than the second sealing ring (130). [17] Sealing system (200) for a control valve (300), comprising a packing (210), a pressure piece (220), an abutment (230) and a spring force device (240), wherein the spring force device (240) is designed to apply a spring force to the abutment (230), wherein the abutment (230) is designed to transmit the spring force to the pressure piece (220) and wherein the pressure piece (220) is designed to transmit the spring force at least indirectly to the packing (210) and to compress it, characterized by a sealing device (100) according to at least one of claims 1 to 14, wherein the sealing device is arranged axially between the pressure piece (220) and the packing (210). [18] Sealing system (200) according to claim 17, characterized by that an open side of the first groove (121) and an open side of the second groove (131) are aligned in the direction of the packing (210). [19] Control valve (300), characterized bya sealing system (200) according to at least one of claims 17 and 18, wherein the sealing system is arranged in an upper housing part of the control valve (300).

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