Double-isolation type corrugated pipe valve

Abstract

The utility model discloses a double-isolation type corrugated pipe valve which comprises a valve body, a first valve element, a second valve element, a first valve element and a second valve element. The valve seat is mounted on the valve body; the first valve plug assembly is arranged in the first channel; the second valve plug assembly is arranged in the second channel; the driving device is arranged on the valve seat, and the driving device is provided with two output ends; the first corrugated pipe is arranged on the part of the first valve plug assembly in a sleeving manner, and the other end of the first corrugated pipe is connected with one output end; and the second corrugated pipe is arranged on the part of the second valve plug assembly in a sleeving mode, and the other end of the second corrugated pipe is connected with the other output end. By applying the double-isolation type corrugated pipe valve, the occupied space is small, synchronous opening or closing of the double valve plugs is achieved at the same time, an independent gas replacement space is formed between the two valve plugs, and the safety of follow-up welding is guaranteed.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a double-isolation bellows valve. Background Technology

[0002] In the field of bulk gas supply, special gases such as oxygen and hydrogen are dangerous. For example, oxygen is flammable and hydrogen is flammable and explosive. Therefore, when carrying out downstream modifications to their pipelines, extra caution is required, and special safety measures must be taken to avoid dangerous accidents.

[0003] In existing technologies, when downstream hot work operations such as welding are required (e.g., modifications to pipelines or equipment connections), an isolation medium must be installed between the welding pipelines to ensure safety. Specifically, two valves are installed at intervals along the pipeline, and an inert gas is used to purge the space between them. The purpose of this inert gas purging is to remove hazardous gases such as oxygen and hydrogen from the space between the valves and replace them with stable gases (like argon and nitrogen, which are less prone to chemical reactions), creating a relatively safe environment and preventing combustion or explosions during subsequent welding. However, using two valves not only occupies a large space but also requires separate operation of each valve, posing a risk of misoperation. Furthermore, the purging section between the two valves results in a long time required to reconnect high-purity gas and a large consumption of purging gas. Utility Model Content

[0004] In view of this, in order to solve the above problems, the purpose of this utility model is to provide a double-isolation bellows valve, comprising:

[0005] The valve body has a flow channel, a first channel, and a second channel formed therein, with one end of the first channel and one end of the second channel both connected to the flow channel.

[0006] A valve seat, which is mounted on the valve body;

[0007] A first valve plug assembly is movably disposed within the first channel;

[0008] A second valve plug assembly is movably disposed within the second channel;

[0009] A driving device is disposed on the valve seat and has two output ends, which are respectively connected to the first valve plug assembly and the second valve plug assembly.

[0010] A first bellows is sleeved on a portion of the first valve plug assembly. One end of the first bellows is connected to the other end of the first channel, and the other end of the first bellows is connected to one of the output terminals.

[0011] The second bellows is sleeved on the portion of the second valve plug assembly. One end of the second bellows is connected to the other end of the second channel, and the other end of the second bellows is connected to another of the output terminals.

[0012] The flow channel is divided into a first part, a second part, and a third part by the first valve plug assembly and the second valve plug assembly. The first part has a first purge port, the second part has two replacement ports, and the third part has a second purge port.

[0013] In another preferred embodiment, the driving device includes: a valve stem, a connecting plate, a handwheel, and a rotating component. The valve stem is movably disposed within the valve seat. One end of the valve stem is connected to one end of the connecting plate. The other end of the connecting plate is provided with two output ends. The rotating component is sleeved on the other end of the valve stem. The handwheel is disposed on one end of the valve seat and connected to the rotating component. The handwheel is used to drive the axial movement of the valve stem.

[0014] In another preferred embodiment, a first sealing disc is embedded at one end of the first channel, a second sealing disc is embedded at one end of the second channel, one end of the first bellows is connected to the first sealing disc, the other end of the first bellows is connected to the connecting disc, one end of the second bellows is connected to the second sealing disc, and the other end of the second bellows is connected to the connecting disc.

[0015] In another preferred embodiment, the valve seat includes: a first connecting portion, a second connecting portion, and a third connecting portion arranged sequentially from top to bottom, the third connecting portion being arranged in communication with the valve body, one end of the valve stem passing through the first connecting portion and the second connecting portion sequentially and extending into the third connecting portion, and the rotating member being disposed within the first connecting portion.

[0016] In another preferred embodiment, a sealing gasket layer is provided on the inner side of one end of the second connection portion, and the valve stem passes through the sealing gasket layer.

[0017] In another preferred embodiment, it further includes a fixing nut disposed on the valve stem and abutting against the handwheel.

[0018] In another preferred embodiment, the first valve plug assembly includes a first rod and a first valve plug, one end of the first rod being connected to one of the output terminals, and the other end of the first rod being connected to one end of the first valve plug.

[0019] In another preferred embodiment, the second valve plug assembly includes: a second rod and a second valve plug, one end of the second rod being connected to another of the output terminals, and the other end of the second rod being connected to one end of the second valve plug.

[0020] Because this utility model adopts the above-mentioned technical solution, it has the following positive effects compared with the prior art:

[0021] By applying this utility model, a double-isolation bellows valve is provided. Through the integrated valve design, it occupies less space and realizes the synchronous opening or closing of the two valve plugs, and forms an independent gas replacement space between the two valve plugs, ensuring the safety of subsequent welding. Attached Figure Description

[0022] Figure 1 This is an overall structural diagram of a double-isolation bellows valve according to this utility model.

[0023] In the attached image:

[0024] 100. Valve body; 110. Flow channel; 111. First purge port; 112. Replacement port; 113. Second purge port; 120. First channel; 121. First sealing disc; 130. Second channel; 131. Second sealing disc; 140. First connecting flange; 150. Second connecting flange; 200. Valve seat; 210. First connecting part; 220. Second connecting part; 221. Sealing gasket; 230. Third connecting part; 300. Drive device; 310. Valve stem; 320. Connecting disc; 330. Handwheel; 340. Rotating component; 400. Cover; 500. First valve plug assembly; 510. First rod; 520. First valve plug; 600. Second valve plug assembly; 610. Second rod; 620. Second valve plug; 700. First bellows; 800. Second bellows; 900. Fixing nut. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "inner", "outer", "front", "back", "horizontal", and "vertical" are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0027] It should be noted that the terms "horizontal" and "vertical" in this utility model are used to describe approximate positional relationships, and not strictly "horizontal plane" or "vertical plane".

[0028] like Figure 1 The diagram illustrates a preferred embodiment of a double-isolation bellows valve, comprising: a valve body 100, wherein a flow channel 110, a first channel 120, and a second channel 130 are formed within the valve body 100, one end of the first channel 120 and one end of the second channel 130 being connected to the flow channel 110; a valve seat 200 mounted on the valve body 100; a first valve plug assembly 500 movably disposed within the first channel 120; a second valve plug assembly 600 movably disposed within the second channel 130; a drive device 300 disposed on the valve seat 200, the drive device 300 having two output ends, the two output ends being respectively connected to the first valve plug assembly 500 and the second valve plug assembly 600; and a first bellows 7. 00, a first bellows 700 is sleeved on a portion of the first valve plug assembly 500, one end of the first bellows 700 is connected to the other end of the first channel 120, and the other end of the first bellows 700 is connected to one of the output ends; a second bellows 800 is sleeved on a portion of the second valve plug assembly 600, one end of the second bellows 800 is connected to the other end of the second channel 130, and the other end of the second bellows 800 is connected to another output end; wherein, the flow channel 110 is divided into a first part, a second part, and a third part arranged sequentially by the first valve plug assembly 500 and the second valve plug assembly 600, the first part is provided with a first purge port 111, the second part is provided with two replacement ports 112, and the third part is provided with a second purge port 113. Furthermore, the first valve plug assembly 500 and the second valve plug assembly 600 are driven by the drive device 300 to perform corresponding valve closing actions to separate the flow channel 110. In particular, the second part between the first part and the third part forms an independent gas replacement space, and the replacement of the isolation medium is achieved through the first purge port 111, the two replacement ports 112 and the second purge port 113 to ensure the safety of subsequent welding.

[0029] Furthermore, as a preferred embodiment, the isolation medium is preferably an inert gas.

[0030] Furthermore, in a preferred embodiment, the drive device 300 includes: a valve stem 310, a connecting plate 320, a handwheel 330, and a rotating component 340. The valve stem 310 is movably disposed within the valve seat 200. One end of the valve stem 310 is connected to one end of the connecting plate 320. The other end of the connecting plate 320 is provided with two output ends. The rotating component 340 is sleeved on the other end of the valve stem 310. The handwheel 330 is disposed at one end of the valve seat 200 and is connected to the rotating component 340. The handwheel 330 is used to drive the axial movement of the valve stem 310.

[0031] Furthermore, in a preferred embodiment, the valve stem 310 has an external thread, and the rotating component 340 has an internal thread; the valve stem 310 and the rotating component 340 are connected by a threaded engagement. Furthermore, the handwheel 330 rotates to drive the rotating component 340, which is fixedly connected to it, to rotate. At this time, the valve stem 310 moves axially under the engagement of the external thread and the internal thread of the rotating component 340.

[0032] Furthermore, as a preferred embodiment, a guide member is provided on the valve stem 310. The guide member is used to guide the axial movement of the valve stem 310 and restrict the rotation of the valve stem 310. The guide member can be located at a fixed position inside the valve seat 200.

[0033] Furthermore, as a preferred embodiment, the guiding component is preferably a combination of a slider and a groove.

[0034] Furthermore, as a preferred embodiment, the rotating component 340 is preferably a bearing structure. Furthermore, the handwheel 330 is preferably connected to the inner ring of the bearing, and the inner wall of the bearing's inner ring is provided with the aforementioned internal thread.

[0035] Furthermore, as a preferred embodiment, it also includes a cover 400 disposed above the rotating member 340.

[0036] Furthermore, in a preferred embodiment, a first sealing disc 121 is embedded at one end of the first channel 120, a second sealing disc 131 is embedded at one end of the second channel 130, one end of the first bellows 700 is connected to the first sealing disc 121, and the other end of the first bellows 700 is connected to the connecting disc 320, one end of the second bellows 800 is connected to the second sealing disc 131, and the other end of the second bellows 800 is connected to the connecting disc 320. Furthermore, the first sealing disc 121 can be considered as part of the first channel 120, and the second sealing disc 131 can be considered as part of the second channel 130.

[0037] Furthermore, in a preferred embodiment, the valve seat 200 includes a first connecting portion 210, a second connecting portion 220, and a third connecting portion 230 arranged sequentially from top to bottom. The third connecting portion 230 is arranged in communication with the valve body 100. One end of the valve stem 310 passes through the first connecting portion 210 and the second connecting portion 220 sequentially and extends into the third connecting portion 230. The rotating member 340 is disposed in the first connecting portion 210.

[0038] Furthermore, in a preferred embodiment, a sealing gasket 221 is provided on the inner side of one end of the second connection portion 220, and the valve stem 310 is disposed through the sealing gasket 221. Further, the sealing gasket 221 is used to prevent leakage of the isolation medium.

[0039] Furthermore, as a preferred embodiment, it further includes: a fixing nut 900, which is disposed on the valve stem 310 and abuts against the handwheel 330. The fixing nut 900 is further used to prevent the handwheel 330 from falling off.

[0040] Furthermore, as a preferred embodiment, the first valve plug assembly 500 includes: a first rod 510 and a first valve plug 520, one end of the first rod 510 being connected to an output end, and the other end of the first rod 510 being connected to one end of the first valve plug 520.

[0041] Furthermore, as a preferred embodiment, the second valve plug assembly 600 includes: a second rod 610 and a second valve plug 620, one end of the second rod 610 being connected to another output end, and the other end of the second rod 610 being connected to one end of the second valve plug 620.

[0042] Furthermore, in a preferred embodiment, the outer contour of the first valve plug 520 matches the inner contour of the first channel 120, and the outer contour of the second valve plug 620 matches the inner contour of the second channel 130. That is, the outer side of the first valve plug 520 abuts against the inner wall of the first channel 120, and the outer side of the second valve plug 620 abuts against the inner wall of the second channel 130, so as to prevent gas from entering the valve seat 200 from the valve body 100.

[0043] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model.

[0044] Based on the above, this utility model also has the following embodiments:

[0045] In a further embodiment of the present invention, a first connecting flange 140 is provided at one end of the lower side of the valve body 100, and a second connecting flange 150 is provided at the other end of the lower side of the valve body 100. The first connecting flange 140 is connected to a pipeline of an upstream device, and the second connecting flange 150 is connected to a pipeline of a downstream device.

[0046] In a further embodiment of this utility model, the valve seat 200 and the valve body 100 are preferably connected by bolts and nuts.

[0047] In a further embodiment of this utility model, the first purge port 111, the replacement port 112, and the second purge port 113 can all be selectively opened or closed by valves or plugs.

[0048] The specific operating steps of the double-isolation bellows valve of this utility model are as follows:

[0049] First, turn the handwheel 330, causing the valve stem 310 to move downwards and move the connecting plate 320. The two output ends of the connecting plate 320 respectively drive the first valve plug assembly 500 and the second valve plug assembly 600 downwards and into the interior of the flow channel 110 until the flow channel 110 is divided into a first part, a second part, and a third part, thus completing the closing operation of this double-isolation bellows valve. Then, inert gas is introduced into the third part through the second purge port 113 and the original gas in the third part is discharged. Inert gas is introduced into the second part through a replacement port 112 and... The original gas in the second part is discharged to ensure the safety of subsequent welding operations. Then, after the welding operation is completed, the original gas is introduced into the third part through the second purge port 113 until the gas in the third part reaches a high purity level. The original gas is then introduced into the second part through a replacement port 112 until the gas in the second part reaches a high purity level. Finally, the purity of the gas in the second part is tested through another replacement port 112. When the gas purity meets the requirements, the handwheel 330 is turned to complete the opening of this double-isolation bellows valve.

[0050] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A double-isolation bellows valve, characterized in that, include: The valve body has a flow channel, a first channel, and a second channel formed therein, with one end of the first channel and one end of the second channel both connected to the flow channel. A valve seat, which is mounted on the valve body; A first valve plug assembly is movably disposed within the first channel; A second valve plug assembly is movably disposed within the second channel; A driving device is disposed on the valve seat and has two output ends, which are respectively connected to the first valve plug assembly and the second valve plug assembly. A first bellows is sleeved on a portion of the first valve plug assembly. One end of the first bellows is connected to the other end of the first channel, and the other end of the first bellows is connected to one of the output terminals. The second bellows is sleeved on the portion of the second valve plug assembly. One end of the second bellows is connected to the other end of the second channel, and the other end of the second bellows is connected to another of the output terminals. The flow channel is divided into a first part, a second part, and a third part by the first valve plug assembly and the second valve plug assembly. The first part has a first purge port, the second part has two replacement ports, and the third part has a second purge port.

2. The double-isolation bellows valve according to claim 1, characterized in that, The driving device includes a valve stem, a connecting plate, a handwheel, and a rotating component. The valve stem is movably disposed within the valve seat. One end of the valve stem is connected to one end of the connecting plate. The other end of the connecting plate is provided with two output ends. The rotating component is sleeved on the other end of the valve stem. The handwheel is disposed on one end of the valve seat and connected to the rotating component. The handwheel is used to drive the axial movement of the valve stem.

3. The double-isolation bellows valve according to claim 2, characterized in that, A first sealing disc is embedded at one end of the first channel, a second sealing disc is embedded at one end of the second channel, one end of the first bellows is connected to the first sealing disc, the other end of the first bellows is connected to the connecting disc, one end of the second bellows is connected to the second sealing disc, and the other end of the second bellows is connected to the connecting disc.

4. The double-isolation bellows valve according to claim 2, characterized in that, The valve seat includes a first connecting part, a second connecting part, and a third connecting part arranged sequentially from top to bottom. The third connecting part is connected to the valve body. One end of the valve stem passes through the first connecting part and the second connecting part and extends into the third connecting part. The rotating member is disposed in the first connecting part.

5. The double-isolation bellows valve according to claim 4, characterized in that, A sealing gasket layer is provided on the inner side of one end of the second connection part, and the valve stem passes through the sealing gasket layer.

6. The double-isolation bellows valve according to claim 2, characterized in that, Also includes: A fixing nut is provided on the valve stem and is tightly abutted against the handwheel.

7. The double-isolation bellows valve according to claim 1, characterized in that, The first valve plug assembly includes a first rod and a first valve plug, one end of the first rod being connected to an output terminal, and the other end of the first rod being connected to one end of the first valve plug.

8. The double-isolation bellows valve according to claim 1, characterized in that, The second valve plug assembly includes: a second rod and a second valve plug, one end of the second rod being connected to the other of the output terminals, and the other end of the second rod being connected to one end of the second valve plug.

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