Three eccentric metal seal structure for butterfly valve

Abstract

The utility model discloses a three eccentric metal seal structure for butterfly valve belongs to butterfly valve technical field, including valve body and valve plate, and valve plate is installed in the valve body, and the valve rod is installed on the valve plate, and the inside of valve body is equipped with the valve seat, and the gasket and sealing washer are equipped on the valve plate, and the sealing washer protector ring for pressing sealing washer is still equipped on the valve plate. The contact of laminated seal ring and valve seat realizes the cut-off and intercommunication of butterfly valve passageway fluid, realizes the two -way zero leakage of real sense. Laminated seal ring is pressed on the valve plate and gasket by sealing washer protector ring. There is a gap between valve plate and sealing washer protector ring, when the valve is closed, the laminated seal ring is contacted with the valve seat by valve plate, forms the sealing surface, realizes the automatic alignment of laminated seal ring and valve seat by exerting the closing torque, realizes the automatic alignment of eccentric sealing surface, forms the complete sealing band, realizes the reliable zero leakage sealing of real, and realizes very small sealing friction force, reduces the sealing wear.

Description

Technical Field

[0001] This utility model belongs to the field of butterfly valve technology, specifically relating to a triple eccentric metal sealing structure for butterfly valves. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve. Its opening and closing element is a disc-shaped plate. By rotating the plate around a corresponding axis within the valve body, the valve can open, close, or regulate the flow of the medium. Butterfly valves are not only simple in structure, small in size, lightweight, economical in material consumption, small in installation dimensions, low in driving torque, and easy and quick to operate, but they also simultaneously possess excellent flow regulation and sealing characteristics, making them one of the fastest-growing valve types in the past decade. Butterfly valves are classified by structure into center-sealed butterfly valves, single-eccentric-sealed butterfly valves, double-eccentric-sealed butterfly valves, and triple-eccentric-sealed butterfly valves.

[0003] Existing triple-eccentric sealed butterfly valves rely on the valve stem to control opening and closing, making the connection stability between the valve stem and the butterfly plate crucial. However, in actual use, these two components may loosen. When the butterfly plate is subjected to prolonged liquid pressure, the valve stem and butterfly plate are more prone to loosening. Liquid pressure is a common and continuous force in pipeline systems, and existing butterfly valves cannot effectively cope with this continuous pressure. When the valve stem and butterfly plate loosen, the butterfly plate is easily rotated under the impact of water pressure inside the valve body, causing gaps to appear between the butterfly plate and the valve body, ultimately leading to water leakage from the pipe. Sealing performance is one of the key performance indicators of a valve, and existing triple-eccentric sealed butterfly valves are prone to sealing failure due to loosening of the valve stem and butterfly plate, severely affecting their normal function and failing to meet the sealing requirements of pipeline systems.

[0004] Chinese patent CN120027223A, published on May 23, 2025, discloses a bidirectional triple-eccentric butterfly valve, comprising: a valve body; a valve stem perpendicular to its axis and rotatably fitted within the valve body, the valve stem being offset from the valve body axis; a butterfly plate rotatably fitted within the valve body, the first and second sides of the butterfly plate respectively having a first cone and a second cone coaxial with it; the valve stem being rotated to an eccentric position on the first cone; and the second side of the butterfly plate being connected to a control drive mounted on the valve body, the butterfly plate rotating along the valve stem axis under the drive of the control drive to open or close the valve body cavity. This patent achieves sealing through contact between the butterfly plate and an elastic or metal valve seat. However, most of these structures have low sealing pressure ratings and temperature ranges, are complex to assemble, and have low safety and reliability. Utility Model Content

[0005] The purpose of this invention is to solve the problems of existing technologies and provide a triple eccentric metal sealing structure for butterfly valves. This structure achieves both shut-off and connection of fluid within the butterfly valve passage through the contact between a laminated sealing ring and the valve seat, realizing true bidirectional zero leakage. The laminated sealing ring is pressed onto the valve plate and gasket by a sealing ring retainer. There is a gap between the valve plate and the sealing ring retainer. When the valve is closed, the valve plate drives the laminated sealing ring to contact the valve seat, forming a sealing surface. By applying a closing torque, the laminated sealing ring and the valve seat are automatically aligned, achieving automatic alignment and homing of the eccentric sealing surface, forming a complete sealing band, realizing a truly reliable zero-leakage seal, and achieving very low sealing friction, reducing seal wear.

[0006] This utility model is achieved through the following technical solution:

[0007] A triple eccentric metal sealing structure for a butterfly valve includes a valve body and a valve plate. The valve plate is detachably installed in the inner cavity of the valve body. A valve stem for its own movement is detachably installed on the valve plate. A valve seat is provided in the inner cavity of the valve body. A gasket mounting groove and a sealing ring mounting groove are provided on the valve plate. A gasket and a laminated sealing ring are respectively provided in the gasket mounting groove and the sealing ring mounting groove. A sealing ring guard ring for pressing the sealing ring is also provided on the valve plate.

[0008] Preferably, the laminated sealing ring comprises a metal layer, a graphite layer, and a metal layer arranged sequentially.

[0009] Preferably, the graphite layer has at least one layer.

[0010] Preferably, both the sealing ring and the valve plate are provided with bolt fixing holes that match the fixing bolts of the sealing ring.

[0011] Preferably, the valve plate is provided with a valve stem through hole for mounting the valve stem.

[0012] Preferably, the valve seat is welded into the inner cavity of the valve body.

[0013] Preferably, the gasket adopts a spiral wound structure.

[0014] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0015] I. This utility model provides a triple eccentric metal sealing structure for butterfly valves. Through the contact between a laminated sealing ring and the valve seat, it achieves both shut-off and connection of fluid within the butterfly valve channel, realizing true bidirectional zero leakage. The laminated sealing ring is pressed onto the valve plate and gasket by a sealing ring retainer. There is a gap between the valve plate and the sealing ring retainer. When the valve is closed, the valve plate drives the laminated sealing ring to contact the valve seat, forming a sealing surface. By applying a closing torque, the laminated sealing ring and the valve seat are automatically aligned, achieving automatic alignment and equilibration of the eccentric sealing surface, forming a complete sealing band, realizing a truly reliable zero-leakage seal, and achieving very low sealing friction, reducing seal wear.

[0016] II. This utility model provides a triple-eccentric metal sealing structure for butterfly valves, where the sealing ring and valve seat completely disengage during opening and closing, avoiding scraping and wear common in traditional butterfly valves and significantly extending service life. When the valve opens, rapid disengagement is achieved. When the valve closes, a wedge-shaped clamping force is formed through the geometric eccentric angle, becoming increasingly tighter with pressure. Zero leakage is achieved under both forward and reverse pressure. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention. Figure 1 ;

[0018] Figure 2 This is a schematic diagram of the valve plate in this utility model. Figure 1 ;

[0019] Figure 3 This is a schematic diagram of the valve plate in this utility model. Figure 2 ;

[0020] Figure 4 This is a schematic diagram of the laminated seal structure in this utility model;

[0021] Figure 5 This is a schematic diagram of the structure of the present invention used in a butterfly valve.

[0022] The components are: 1. Valve body; 2. Valve plate; 3. Valve stem; 4. Valve seat; 5. Gasket mounting groove; 6. Sealing ring mounting groove; 7. Gasket; 8. Laminated sealing ring; 81. Metal layer; 82. Graphite layer; 9. Sealing ring guard ring; 10. Guard ring fixing bolt; 11. Bolt fixing hole; 12. Valve stem through hole. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the embodiments, but the implementation of the present invention is not limited thereto.

[0024] Example 1

[0025] like Figures 1-3As shown, this embodiment provides a triple eccentric metal sealing structure for a butterfly valve, including a valve body 1 and a valve plate 2. The valve plate 2 is detachably installed in the inner cavity of the valve body 1. A valve stem 3 for its own movement is detachably installed on the valve plate 2. A valve seat 4 is provided in the inner cavity of the valve body 1. A gasket mounting groove 5 and a sealing ring mounting groove 6 are provided on the valve plate 2. A gasket 7 and a laminated sealing ring 8 are respectively provided in the gasket mounting groove 5 and the sealing ring mounting groove 6. A sealing ring guard ring 9 for pressing the sealing ring 8 is also provided on the valve plate 2.

[0026] Example 2

[0027] like Figures 1-5 As shown, this embodiment provides a triple eccentric metal sealing structure for a butterfly valve, including a valve body 1 and a valve plate 2. The valve plate 2 is detachably installed in the inner cavity of the valve body 1. A valve stem 3 for its own movement is detachably installed on the valve plate 2. A valve seat 4 is provided in the inner cavity of the valve body 1. A gasket mounting groove 5 and a sealing ring mounting groove 6 are provided on the valve plate 2. A gasket 7 and a laminated sealing ring 8 are respectively provided in the gasket mounting groove 5 and the sealing ring mounting groove 6. A sealing ring guard ring 9 for pressing the sealing ring 8 is also provided on the valve plate 2.

[0028] The laminated sealing ring 8 includes a metal layer 81, a graphite layer 82, and a metal layer 81 arranged sequentially.

[0029] The graphite layer 82 is at least one layer. The number of graphite layers 82 is selected according to actual needs.

[0030] Both the sealing ring 9 and the valve plate 2 are provided with bolt fixing holes 11 that match the fixing bolts 10 of the sealing ring.

[0031] The valve plate 2 is provided with a valve stem through hole 12 for installing the valve stem 3.

[0032] The valve seat 4 is welded into the inner cavity of the valve body 1.

[0033] The gasket 7 adopts a spiral winding structure.

[0034] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0035] I. This utility model provides a triple eccentric metal sealing structure for a butterfly valve. Through the contact between a laminated sealing ring and the valve seat 4, it achieves both shut-off and connection of fluid within the butterfly valve channel, realizing true bidirectional zero leakage. The laminated sealing ring is pressed onto the valve plate 2 and gasket 7 via a sealing ring retainer 9. There is a gap between the valve plate 2 and the sealing ring retainer 9. When the valve is closed, the valve plate 2 drives the laminated sealing ring to contact the valve seat 4, forming a sealing surface. By applying a closing torque, the laminated sealing ring and valve seat 4 are automatically aligned, achieving automatic alignment and homing of the eccentric sealing surface, forming a complete sealing band, realizing a truly reliable zero-leakage seal, and achieving very low sealing friction, reducing seal wear.

[0036] II. This utility model provides a triple-eccentric metal sealing structure for butterfly valves, where the sealing ring and valve seat completely disengage during opening and closing, avoiding scraping and wear common in traditional butterfly valves and significantly extending service life. When the valve opens, rapid disengagement is achieved. When the valve closes, a wedge-shaped clamping force is formed through the geometric eccentric angle, becoming increasingly tighter with pressure. Zero leakage is achieved under both forward and reverse pressure.

[0037] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A triple eccentric metal sealing structure for a butterfly valve, characterized in that: The valve includes a valve body (1) and a valve plate (2). The valve plate (2) is detachably installed in the inner cavity of the valve body (1). A valve stem (3) for its own movement is detachably installed on the valve plate (2). A valve seat (4) is provided in the inner cavity of the valve body (1). A gasket mounting groove (5) and a sealing ring mounting groove (6) are provided on the valve plate (2). A gasket (7) and a laminated sealing ring (8) are respectively provided in the gasket mounting groove (5) and the sealing ring mounting groove (6). A sealing ring guard (9) for pressing the sealing ring (8) is also provided on the valve plate (2).

2. The triple eccentric metal sealing structure for a butterfly valve according to claim 1, characterized in that: The laminated sealing ring (8) includes a metal layer (81), a graphite layer (82), and a metal layer (81) arranged sequentially.

3. The triple eccentric metal sealing structure for a butterfly valve according to claim 2, characterized in that: The graphite layer (82) has at least one layer.

4. The triple eccentric metal sealing structure for a butterfly valve according to claim 1, characterized in that: Both the sealing ring guard ring (9) and the valve plate (2) are provided with bolt fixing holes (11) that match the guard ring fixing bolts (10).

5. The triple eccentric metal sealing structure for a butterfly valve according to claim 1, characterized in that: The valve plate (2) is provided with a valve stem through hole (12) for installing the valve stem (3).

6. The triple eccentric metal sealing structure for a butterfly valve according to claim 1, characterized in that: The valve seat (4) is welded into the inner cavity of the valve body (1).

7. The triple eccentric metal sealing structure for a butterfly valve according to claim 1, characterized in that: The gasket (7) adopts a spiral wound structure.

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