Three-eccentric center butterfly valve of split type valve seat structure

Abstract

The utility model provides a three-eccentric center butterfly valve with a split type valve seat structure, which comprises a valve body, a three-eccentric center butterfly valve and a valve seat, the valve seat assembly is located in the medium channel, and the valve seat assembly comprises a rigid valve seat and a flexible valve seat installed on the rigid valve seat; the limiting assembly is installed on the valve body and used for abutting against the valve seat assembly to limit the valve seat assembly; the valve plate assembly is arranged in the medium channel and can be matched with the valve seat assembly to form a sealing pair; and the valve rod can be rotationally mounted in the valve body along the axis of the valve rod, is fixed with the valve plate assembly, and is used for driving the valve plate assembly to open and close. According to the scheme, the flexible sealing effect is achieved through the flexible valve seat, rigid supporting is conducted on the flexible valve seat through the rigid valve seat, the deformation amount of the flexible valve seat in the using process is limited, and therefore the service life of the flexible valve seat is prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of valves, and particularly relates to a triple-eccentric butterfly valve with a split valve seat structure. Background Art

[0002] Since the valve seat or sealing ring of a soft-sealed butterfly valve adopts a soft-sealed non-metallic structure, and the non-metal can achieve excellent sealing performance after being extruded when the valve is closed, the soft-sealed butterfly valve, as a component for cutting off and controlling the flow in a pipeline system, has been extremely widely used in many fields such as petroleum, chemical industry, metallurgy, and hydropower. When the existing soft-sealed butterfly valve is in use, it has good sealing performance, but its service life is not long. After long-term use, the soft-sealed valve seat or sealing ring is easily scratched during the opening and closing process of the valve. Even if it can be replaced on-site, frequent replacement of the sealing parts has a very inconvenient and adverse impact on the on-site operation of the valve and the on-site production. Summary of the Utility Model

[0003] In view of the above-mentioned disadvantages of the prior art, the purpose of the present utility model is to provide a triple-eccentric butterfly valve with a split valve seat structure to solve the above problems.

[0004] To achieve the above purpose and other related purposes, the present utility model provides a triple-eccentric butterfly valve with a split valve seat structure, including:

[0005] A valve body, in which a medium passage is provided;

[0006] A valve seat assembly, located in the medium passage, and the valve seat assembly includes a rigid valve seat and a flexible valve seat installed on the rigid valve seat;

[0007] A limiting assembly, installed on the valve body, for abutting against the valve seat assembly to limit the valve seat assembly;

[0008] A valve plate assembly, arranged in the medium passage, and capable of cooperating with the valve seat assembly to form a sealing pair;

[0009] A valve stem, rotatably installed in the valve body along its own axis and fixed to the valve plate assembly, for driving the opening and closing action of the valve plate assembly.

[0010] Optionally, the flexible valve seat is arranged on one side of the rigid valve seat close to the valve plate assembly, and a sealing mating surface is arranged on the flexible valve seat, and the sealing mating surface is used for cooperating with the valve plate assembly to form the sealing pair.

[0011] Optionally, an abutting portion for abutting against the rigid valve seat is arranged in the valve body, and a sealing gasket is arranged between the abutting portion and the rigid valve seat.

[0012] Optionally, multiple sealing surfaces are provided between the rigid valve seat and the flexible valve seat.

[0013] Optionally, a sealing inclined surface, a sealing convex surface, and a sealing concave surface are provided between the flexible valve seat and the rigid valve seat.

[0014] Optionally, from the side away from the valve plate assembly to the side close to the valve plate assembly, the sealing inclined surface, the sealing convex surface, and the sealing concave surface are arranged in sequence.

[0015] Optionally, the limiting assembly includes a valve seat retaining ring and a valve seat pressing ring for pressing the valve seat assembly. The valve seat retaining ring is limited in the medium channel. A pressing member is provided on the valve seat retaining ring facing the inside of the medium channel. The pressing member presses the valve seat pressing ring to press the valve seat assembly.

[0016] Optionally, a limiting ring is provided between the valve seat retaining ring and the valve body.

[0017] Optionally, a contact plane for simultaneously abutting against the rigid valve seat and the flexible valve seat is provided on the valve seat pressing ring.

[0018] As described above, the three-eccentric butterfly valve with a split valve seat structure of the present utility model has the following beneficial effects:

[0019] In this solution, the flexible valve seat plays a role in flexible sealing, and the rigid valve seat rigidly supports the flexible valve seat to limit the deformation amount of the flexible valve seat during use, so as to increase the service life of the flexible valve seat. At the same time, after the flexible valve seat is damaged, the flexible valve seat can be directly replaced, which is convenient and cost-saving. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the three-eccentric butterfly valve with a split valve seat structure in the embodiment of the present utility model.

[0021] Figure 2 It is Figure 1 The enlarged view of part A in

[0022] Figure 3 It is a partial view of the flexible valve seat in the embodiment of the present utility model. Detailed Description of the Invention

[0023] The reference numerals in the drawings of the specification include: valve body 1, abutting portion 101, valve stem 2, valve plate 3, valve plate pressing ring 4, sealing ring 5, rigid valve seat 6, flexible valve seat 7, sealing inclined surface 701, sealing convex surface 702, sealing concave surface 703, convex portion 704, sealing mating surface 705, valve seat pressing ring 8, valve seat retaining ring 9, limiting ring 10, anti-rotation screw 11, locking screw 12.

[0024] The following specific embodiments illustrate the implementation manners of the present utility model, and those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification.

[0025] The present utility model provides a triple-eccentric butterfly valve with a split valve seat structure, as Figures 1 to 3 shown.

[0026] In an exemplary embodiment, it includes:

[0027] A valve body 1, in which a medium channel is provided;

[0028] A valve seat assembly, located in the medium channel, and the valve seat assembly includes a rigid valve seat 6 and a flexible valve seat 7 mounted on the rigid valve seat 6;

[0029] A limit assembly, mounted on the valve body 1, and used to abut against the valve seat assembly for limiting the valve seat assembly;

[0030] A valve plate assembly, arranged in the medium channel, and capable of cooperating with the valve seat assembly to form a sealing pair;

[0031] A valve stem 2, rotatably mounted in the valve body 1 along its own axis and fixed to the valve plate assembly, and used to drive the opening and closing actions of the valve plate assembly.

[0032] In this embodiment, the flexible valve seat 7 plays a role of flexible sealing, and the rigid valve seat 6 rigidly supports the flexible valve seat 7 to limit the deformation amount of the flexible valve seat 7 during use, so as to increase the service life of the flexible valve seat 7. At the same time, after the flexible valve seat 7 is damaged, the flexible valve seat 7 can be directly replaced, which is convenient for replacement and saves costs.

[0033] Exemplarily, the rigid valve seat 6 is made of a metal material, and the flexible valve seat 7 is made of polytetrafluoroethylene.

[0034] In an exemplary embodiment, the flexible valve seat 7 is arranged on the side of the rigid valve seat 6 close to the valve plate assembly, and a sealing mating surface 705 is provided on the flexible valve seat 7, and the sealing mating surface 705 is used to cooperate with the valve plate assembly to form a sealing pair.

[0035] In this embodiment, there is no direct contact between the rigid valve seat 6 and the valve plate assembly, and only a sealing pair is formed between the flexible valve seat 7 and the valve plate assembly. Through the flexible deformation characteristic of the flexible valve seat 7, the sealing performance between the flexible valve seat 7 and the valve plate assembly is increased.

[0036] In an exemplary embodiment, an abutting portion 101 for the rigid valve seat 6 to abut against is provided in the valve body 1, and a sealing gasket is provided between the abutting portion 101 and the rigid valve seat 6.

[0037] In this embodiment, the gasket is provided to achieve the seal between the rigid valve seat 6 and the valve body 1, preventing the medium from flowing through the gap between the rigid valve seat 6 and the valve body 1.

[0038] In an exemplary embodiment, multiple sealing surfaces are provided between the rigid valve seat 6 and the flexible valve seat 7.

[0039] In this embodiment, by providing multiple sealing surfaces between the rigid valve seat 6 and the flexible valve seat 7, the seal between the rigid valve seat 6 and the flexible valve seat 7 is achieved, preventing the medium from passing through the gap between the rigid valve seat 6 and the flexible valve seat 7.

[0040] In an exemplary embodiment, a sealing inclined surface 701, a sealing convex surface 702, and a sealing concave surface 703 are provided between the flexible valve seat 7 and the rigid valve seat 6.

[0041] It should be noted that the provision of the sealing inclined surface 701 gradually increases the sealing performance between the flexible valve seat 7 and the rigid valve seat 6 when the flexible valve seat 7 is squeezed. The sealing convex surface 702 and the sealing concave surface 703 form a tenon and mortise surface with the rigid valve seat 6, increasing the sealing performance between the flexible valve seat 7 and the rigid valve seat 6.

[0042] In an exemplary embodiment, the sealing inclined surface 701, the sealing convex surface 702, and the sealing concave surface 703 are arranged in sequence from the side away from the valve plate assembly to the side close to the valve plate assembly.

[0043] Exemplarily, the minimum distance between the sealing convex surface 702 and the valve stem 2 is less than that between the sealing concave surface 703 and the valve stem 2, and the minimum distance between the sealing concave surface 703 and the valve stem 2 is less than that between the sealing inclined surface 701 and the valve stem 2.

[0044] In an exemplary embodiment, the limiting assembly includes a valve seat retaining ring 9 and a valve seat pressing ring 8 for pressing the valve seat assembly. The valve seat retaining ring 9 is limited in the medium channel, and a pressing member is provided on the valve seat retaining ring 9 facing the inside of the medium channel. The pressing member presses the valve seat pressing ring 8 to press the valve seat assembly.

[0045] Exemplarily, a mounting hole is formed through the valve seat retaining ring 9, and the pressing member is installed in the mounting hole. The pressing member includes a non-rotating screw 11 and a locking screw 12 that abut against each other, and the locking screw 12 presses the valve seat pressing ring 8.

[0046] It should also be noted that the flexible valve seat 7 is designed with a sealed concave surface 703 and a sealed convex surface 702. The purpose is to prevent the shrinkage deformation of the flexible valve seat 7 at low temperatures. When the triple-eccentric butterfly valve is applied to a low-temperature environment, the non-metallic PTFE valve seat (i.e., the flexible valve seat 7) is greatly affected by temperature and shrinks and deforms, thus affecting the sealing of the valve. A sealed convex surface 702 is designed on the flexible valve seat 7 to cooperate with the groove on the rigid valve seat 6. The groove on the rigid valve seat 6 plays a good role in restricting the deformation of the flexible valve seat 7, preventing the non-metallic PTFE valve seat from being excessively deformed due to temperature influence and causing leakage of the triple-eccentric butterfly valve, and at the same time increasing the service life of the flexible valve seat 7.

[0047] In an exemplary embodiment, a limit ring 10 is provided between the valve seat retainer 9 and the valve body 1.

[0048] In this embodiment, the setting of the limit ring 10 limits the limit assembly between the valve seat assembly and the limit ring 10.

[0049] In an exemplary embodiment, a contact plane for simultaneously abutting against the rigid valve seat 6 and the flexible valve seat 7 is provided on the valve seat retainer 8.

[0050] In this embodiment, the valve seat retainer 8 simultaneously presses the rigid valve seat 6 and the flexible valve seat 7. By covering the corresponding contact surface on the flexible valve seat 7 through the contact plane, the force on the flexible valve seat 7 is made more uniform, and the sealing performance between the rigid valve seat 6 and the flexible valve seat 7 is increased.

[0051] Exemplarily, the valve plate assembly includes a valve plate 3, a sealing ring 5 provided on the valve plate 3, a valve plate retainer 4 for pressing the sealing ring 5, etc. A sealing pair is formed between the sealing ring 5 and the valve seat assembly. The sealing ring on the valve plate 3 is a separate sealing ring 5 part. If the sealing surface is damaged by foreign objects, the sealing ring 5 can be disassembled and replaced.

[0052] Exemplarily, a convex portion 704 is further provided on the flexible valve seat 7. The sealed mating surface 705 is provided on one side of the convex portion 704 close to the valve plate assembly, and the convex portion 704 extends into the space between the sealing ring 5 and the valve body 1.

[0053] The above embodiments only illustrate the principles and effects of the present invention by way of example, and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A triple-eccentric butterfly valve with a split valve seat structure, characterized in that, Comprising: A valve body, within which a medium passage is provided; A valve seat assembly, located within the medium passage, the valve seat assembly including a rigid valve seat and a flexible valve seat mounted on the rigid valve seat; A limiting assembly, mounted on the valve body, for abutting against the valve seat assembly to limit the valve seat assembly; A valve plate assembly, arranged within the medium passage, capable of cooperating with the valve seat assembly to form a sealing pair; A valve stem, rotatably mounted about its own axis within the valve body and fixed to the valve plate assembly, for driving the opening and closing movement of the valve plate assembly.

2. The triple-offset butterfly valve with a split valve seat structure according to claim 1, wherein The flexible valve seat is arranged on a side of the rigid valve seat close to the valve plate assembly, and a sealing mating surface is provided on the flexible valve seat, the sealing mating surface being used to cooperate with the valve plate assembly to form the sealing pair.

3. The triple-eccentric butterfly valve with a split valve seat structure according to claim 1, characterized in that, An abutting portion for the rigid valve seat to abut against is provided within the valve body, and a gasket is arranged between the abutting portion and the rigid valve seat.

4. The triple-eccentric butterfly valve with a split valve seat structure according to claim 1, characterized in that, Multiple sealing surfaces are arranged between the rigid valve seat and the flexible valve seat.

5. The triple-eccentric butterfly valve with a split valve seat structure according to claim 4, wherein A sealing inclined surface, a sealing convex surface and a sealing concave surface are arranged between the flexible valve seat and the rigid valve seat.

6. The triple-eccentric butterfly valve with a split valve seat structure according to claim 5, characterized in that, From a side far away from the valve plate assembly to a side close to the valve plate assembly, the sealing inclined surface, the sealing convex surface and the sealing concave surface are arranged in sequence.

7. The triple-eccentric butterfly valve with a split valve seat structure according to claim 1, characterized in that, The limiting assembly includes a valve seat retaining ring and a valve seat pressing ring for pressing the valve seat assembly. The valve seat retaining ring is limited within the medium passage, and a pressing member is arranged on the valve seat retaining ring facing the inside of the medium passage. The pressing member presses the valve seat pressing ring to press the valve seat assembly.

8. The triple-eccentric butterfly valve with a split valve seat structure according to claim 7, characterized in that A limiting ring is arranged between the valve seat retaining ring and the valve body.

9. The triple-eccentric butterfly valve with a split valve seat structure according to claim 7, characterized in that, A contact plane for simultaneously abutting against the rigid valve seat and the flexible valve seat is provided on the valve seat pressing ring.

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