Double-seal butterfly valve

Abstract

The utility model provides a double-seal butterfly valve, which comprises a valve body, a valve core, a valve core and a valve core, wherein the valve body is provided with a medium flow channel; the valve rod is mounted in the valve body and penetrates through the medium flow channel; the valve plate assembly is installed on the valve rod, located in the medium flow channel and used for being driven by the valve rod to achieve opening and closing of the medium flow channel. The valve seat assembly comprises an all-metal valve seat installed on the valve body and a soft sealing valve seat installed on the valve body, a first sealing pair is formed between the all-metal valve seat and the valve plate assembly, and a second sealing pair is formed between the soft sealing valve seat and the valve plate assembly. According to the scheme, the sealing performance of the butterfly valve is effectively improved in the mode that soft sealing is combined with hard sealing.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and particularly relates to a double-sealed butterfly valve. Background Art

[0002] At present, the sealing pairs of triple-eccentric butterfly valves on the market are all single all-metal hard-sealing structures, or multi-layer composite seals and soft-sealing structures. The sealing surface of the all-metal hard-sealing butterfly valve can be surfacing welded with hard alloy. The sealing surface has high hardness and can be wear-resistant and corrosion-resistant, but it cannot achieve zero leakage. The sealing pair structure of the soft seal can use rubber seals, or can use multi-layer seals made of thin metal plates plus graphite layers. The overall rigidity of the seal is small, and it is easy to deform under the torque of the actuator, so that the seal can better fit the sealing surface of the valve seat, and the sealing performance is good, and bidirectional zero leakage can be achieved. However, due to the poor wear resistance of rubber, the multi-layer graphite layer is easily washed off by the medium, and it will also seriously affect the sealing performance of the triple-eccentric butterfly valve during long-term use. Content of the Utility Model

[0003] In view of the above-mentioned disadvantages of the prior art, the purpose of the utility model is to provide a double-sealed butterfly valve to solve the above problems.

[0004] To achieve the above-mentioned purpose and other related purposes, the utility model provides a double-sealed butterfly valve, including:

[0005] A valve body, on which a medium flow channel is provided;

[0006] A valve stem, installed in the valve body and passing through the medium flow channel;

[0007] A valve plate assembly, installed on the valve stem and located in the medium flow channel, for being driven by the valve stem to realize the opening and closing of the medium flow channel;

[0008] A valve seat assembly, including an all-metal valve seat installed on the valve body and a soft-sealing valve seat installed on the valve body. A first sealing pair is formed between the all-metal valve seat and the valve plate assembly, and a second sealing pair is formed between the soft-sealing valve seat and the valve plate assembly.

[0009] Optionally, the soft-sealing valve seat includes a sealing skeleton and a soft-sealing sleeve sleeved outside the sealing skeleton. The soft-sealing sleeve and the valve plate assembly cooperate to form the second sealing pair.

[0010] Optionally, the valve body is provided with a stepped surface for installing the all-metal valve seat. The stepped surface includes a first contact surface parallel to the valve stem and a second contact surface. An installation groove is provided on the second contact surface, and the soft-sealing valve seat is installed in the installation groove.

[0011] Optionally, a sealing ring is provided between the first contact surface and the all-metal valve seat.

[0012] Optionally, the all-metal valve seat is provided with a first sealing mating inclined surface for mating with the valve plate assembly, and hard alloy is surfacing-welded on the first sealing mating inclined surface.

[0013] Optionally, the all-metal valve seat and the soft-sealing valve seat are overlapped.

[0014] Optionally, an avoidance opening is provided at one end of the surface of the all-metal valve seat in contact with the soft-sealing valve seat near the valve plate assembly.

[0015] Optionally, the all-metal valve seat is provided with a medium flow-through port, the medium flow-through port is communicated with the medium flow channel, and a part of the valve plate assembly is located in the medium flow-through port.

[0016] Optionally, the all-metal valve seat and the soft-sealing valve seat are fixed to the valve body through locking parts, and the locking parts pass through the all-metal valve seat and the soft-sealing valve seat and then are connected to the valve body.

[0017] Optionally, the valve plate assembly includes a single valve plate, and a second sealing mating inclined surface is provided on the single valve plate, and hard alloy is surfacing-welded on the second sealing mating inclined surface.

[0018] As described above, the double-sealing butterfly valve of the present invention has the following beneficial effects:

[0019] In this solution, through the arrangement of the soft-sealing valve seat and the all-metal valve seat, a first sealing pair and a second sealing pair are formed. Through the double-sealing structure of combining soft and hard, the butterfly valve has both the zero-leakage performance of soft sealing and the wear-resistant performance of hard sealing. It can be applied to working conditions that require tight sealing and contain particulate media, as well as working conditions of low-temperature ice-cold seawater. Description of the Drawings

[0020] Figure 1 It is the front view of the double-sealing butterfly valve in the embodiment of the present invention.

[0021] Figure 2 It is the internal structure schematic diagram of the double-sealing butterfly valve in the embodiment of the present invention.

[0022] Figure 3 It is Figure 2 The enlarged view at A0 in

[0023] Figure 4 It is Figure 2 The sectional view at A-A in Detailed Embodiments

[0024] The reference numerals in the attached drawings of the description include: valve body 1, all-metal valve seat 2, relief port 201, valve plate assembly 3, soft-sealing valve seat 4, sealing skeleton 401, soft-sealing sleeve 402, valve stem 5, locking member 6, and sealing ring 7.

[0025] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand the other advantages and effects of the present invention from the content disclosed in this specification.

[0026] This application provides a double-sealing butterfly valve, as shown in the attached Figures 1 to 4 drawings.

[0027] In an exemplary embodiment of this application, a double-sealing butterfly valve is provided, including:

[0028] A valve body 1, on which a medium flow channel is provided;

[0029] A valve stem 5, installed in the valve body 1 and passing through the medium flow channel;

[0030] A valve plate assembly 3, installed on the valve stem 5 and located in the medium flow channel, for being driven by the valve stem 5 to realize the opening and closing of the medium flow channel;

[0031] A valve seat assembly, including an all-metal valve seat 2 installed on the valve body 1 and a soft-sealing valve seat 4 installed on the valve body 1. A first sealing pair is formed between the all-metal valve seat 2 and the valve plate assembly 3, and a second sealing pair is formed between the soft-sealing valve seat 4 and the valve plate assembly 3.

[0032] In this embodiment, through the settings of the soft-sealing valve seat 4 and the all-metal valve seat 2, a first sealing pair and a second sealing pair are formed. Through the double-sealing structure of combining soft and hard, the butterfly valve simultaneously has the zero-leakage performance of soft sealing and the wear-resistant performance of hard sealing. It can be applied to working conditions that require tight sealing for media containing particles, as well as working conditions of low-temperature ice-cold seawater.

[0033] Exemplarily, the butterfly valve is a triple-eccentric butterfly valve.

[0034] In an exemplary embodiment, the soft-sealing valve seat 4 includes a sealing skeleton 401 and a soft-sealing sleeve 402 sleeved outside the sealing skeleton 401. The soft-sealing sleeve 402 and the valve plate assembly 3 cooperate to form a second sealing pair.

[0035] Exemplarily, the soft-sealing sleeve 402 is made of rubber material.

[0036] It should be noted that if the soft-sealing valve seat 4 is only composed of rubber material, due to the material characteristics, it is easy to have a large deformation amount and is not easy to seal. Therefore, a support is formed through the sealing skeleton 401, and then the soft-sealing sleeve 402 made of rubber material is wrapped to increase the sealing performance.

[0037] Exemplarily, the sealing frame 401 is a full-metal sealing ring.

[0038] In an exemplary embodiment, a stepped surface for installing a full-metal valve seat 2 is provided on the valve body 1. The stepped surface includes a first contact surface and a second contact surface parallel to the valve stem 5. An installation groove is provided on the second contact surface, and a soft-sealing valve seat 4 is installed in the installation groove.

[0039] It should be noted that the stepped surface is provided to facilitate the sealing between the full-metal valve seat 2 and the valve body 1.

[0040] In an exemplary embodiment, a sealing ring 7 is provided between the first contact surface and the full-metal valve seat 2.

[0041] In this embodiment, the sealing ring 7 is provided to increase the sealing performance between the full-metal valve seat 2 and the valve body 1.

[0042] In an exemplary embodiment, a first sealing mating inclined surface for mating with the valve plate assembly 3 is provided on the full-metal valve seat 2, and cemented carbide is surfacing-welded on the first sealing mating inclined surface.

[0043] It should also be noted that the surfacing-welding of cemented carbide is to increase the service life of the full-metal valve seat 2.

[0044] In an exemplary embodiment, the full-metal valve seat 2 and the soft-sealing valve seat 4 are overlapped.

[0045] In this embodiment, the full-metal valve seat 2 and the soft-sealing valve seat 4 are overlapped to increase the sealing performance.

[0046] In an exemplary embodiment, an avoidance opening 201 is provided at one end of the surface of the full-metal valve seat 2 in contact with the soft-sealing valve seat 4 close to the valve plate assembly 3.

[0047] It is emphasized that the avoidance opening 201 is provided to reduce the possibility of damage to the soft-sealing valve seat 4 during installation and use.

[0048] In an exemplary embodiment, a medium flow-through port is provided on the full-metal valve seat 2. The medium flow-through port is communicated with the medium flow channel, and a part of the valve plate assembly 3 is located in the medium flow-through port.

[0049] In this embodiment, the medium flow-through port is provided to realize the flow of the medium.

[0050] In an exemplary embodiment, the full-metal valve seat 2 and the soft-sealing valve seat 4 are fixed to the valve body 1 through a locking member 6. The locking member 6 passes through the full-metal valve seat 2 and the soft-sealing valve seat 4 and then is connected to the valve body 1.

[0051] In this embodiment, there is no need to additionally provide structures such as retaining rings to achieve the installation and fixation of the valve seat assembly, effectively simplifying the structure. Moreover, the locking member 6 is arranged outside the medium flow port and the medium channel, and is not easily affected by the medium flow to affect its installation stability, reducing the possibility of loosening of the valve seat assembly.

[0052] In an exemplary embodiment, the valve plate assembly 3 includes a single valve plate, and a second sealing mating inclined surface is provided on the single valve plate, and cemented carbide is surfacing-welded on the second sealing mating inclined surface.

[0053] In this embodiment, in order to increase the service life of the valve plate, cemented carbide is surfacing-welded on the second sealing mating inclined surface.

[0054] The above embodiments merely 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 completed by those with ordinary knowledge in the technical field without departing from the spirit and technical idea disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A double seal butterfly valve, characterized in that: include: A valve body, wherein a medium flow channel is provided on the valve body; A valve stem, installed in the valve body and passing through the medium flow channel; A valve plate assembly, mounted on the valve stem and located in the medium flow channel, and used to be driven by the valve stem to realize opening and closing of the medium flow channel; The valve seat assembly comprises a full metal valve seat installed on the valve body and a soft sealing valve seat installed on the valve body, wherein a first sealing pair is formed between the full metal valve seat and the valve plate assembly, and a second sealing pair is formed between the soft sealing valve seat and the valve plate assembly.

2. The double-seal butterfly valve according to claim 1, characterized in that: The soft sealing valve seat comprises a sealing frame and a soft sealing sleeve which is sleeved on the sealing frame, and the soft sealing sleeve cooperates with the valve plate assembly to form the second sealing pair.

3. The double-seal butterfly valve according to claim 1, characterized in that: The valve body is provided with a stepped surface for installing a full metal valve seat, the stepped surface includes a first contact surface and a second contact surface parallel to the valve stem, the second contact surface is provided with a mounting groove, and the soft sealing valve seat is installed in the mounting groove.

4. The double-seal butterfly valve according to claim 3, characterized in that: A sealing ring is arranged between the first contact surface and the all-metal valve seat.

5. The double-seal butterfly valve according to claim 1, characterized in that: The all-metal valve seat is provided with a first sealing matching inclined surface for matching with the valve plate assembly, and hard alloy is built-up on the first sealing matching inclined surface.

6. The double-seal butterfly valve according to claim 1, characterized in that: The all-metal valve seat and the soft-sealing valve seat are arranged to overlap each other.

7. The double-seal butterfly valve according to claim 6, characterized in that: A side of the all-metal valve seat that contacts the soft sealing valve seat is provided with an escape opening at one end close to the valve plate assembly.

8. The double-seal butterfly valve according to claim 1, characterized in that: The all-metal valve seat is provided with a medium flow port, the medium flow port is communicated with the medium flow channel, and the valve plate assembly is partially located in the medium flow port.

9. The double-seal butterfly valve according to claim 1, characterized in that: The full metal valve seat and the soft sealing valve seat are fixed to the valve body via a locking piece, and the locking piece passes through the full metal valve seat and the soft sealing valve seat and is connected to the valve body.

10. The double-seal butterfly valve according to claim 1, characterized in that: The valve plate assembly comprises a single valve plate, on which a second sealing matching inclined surface is arranged, and a hard alloy is built-up on the second sealing matching inclined surface.

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