Anti-pollution plug valve structure and double shut-off plug valve

Abstract

This disclosure relates to an anti-contamination plug structure applied to a double-shut-off plug valve. The anti-contamination plug structure includes a valve stem, a plug, and sealing rings. The plug is connected to the valve stem. Sealing rings are provided at the flow channels on both sides of the plug, and are coaxially arranged with the flow channels. The sealing rings are configured to seal against the inner cavity of the valve body when the double-shut-off plug valve is in the open state. Through this technical solution, the anti-contamination plug structure can improve the anti-contamination performance of the double-shut-off plug valve in the open state, preventing impurities from entering the inner cavity of the valve body, maintaining good performance of the double-shut-off plug valve, and thus ensuring its normal operation.

Description

Technical Field

[0001] This disclosure relates to the field of double shut-off plug valve technology, specifically to an anti-pollution plug structure and a double shut-off plug valve. Background Technology

[0002] A conventional double-shut-off plug valve typically features a pair of sealing vanes on its plug, with wedge-shaped surfaces on both sides. The plug and sealing vanes are connected by dovetail bosses. When the valve is closed, the plug pushes against the sealing vanes, causing them to fit tightly against the valve body cavity. Simultaneously, the sealing ring on the sealing vanes deforms, achieving an effective seal. The advantage of this structure is that when the valve is closed, it can prevent impurities in the medium from entering the valve cavity.

[0003] However, this structure creates a gap between the plug and the valve body cavity during the valve's open or operational phase. Impurities in the medium can easily get stuck in this gap, even accumulating in the lower part of the valve cavity. This causes impurity particles trapped between the plug and the valve body cavity to scratch the valve body sealing surface and the plug surface when the plug rotates, affecting valve performance. Furthermore, when the plug is pressed down, the impurities accumulated in the lower part of the valve cavity can hinder the downward movement of the plug, leading to valve jamming or incomplete closure, severely impacting the normal operation of the double shut-off plug valve. Utility Model Content

[0004] The purpose of this disclosure is to provide an anti-contamination plug structure that can improve the anti-contamination performance of a double shut-off plug valve in the open state, prevent impurities from entering the inner cavity of the valve body, maintain the good performance of the double shut-off plug valve, and thus ensure its normal operation.

[0005] To achieve the above objectives, this disclosure provides an anti-contamination plug structure for use in a double shut-off plug valve. The anti-contamination plug structure includes a valve stem, a plug, and a sealing ring. The plug is connected to the valve stem. The sealing ring is provided at the flow passage openings on both sides of the plug. The sealing ring is coaxially arranged with the flow passage openings, and the sealing ring is configured to seal against the inner cavity of the valve body when the double shut-off plug valve is in the open state.

[0006] Optionally, the flow channel is detachably provided with a sleeve, and the sealing ring is disposed on the sleeve.

[0007] Optionally, the sealing ring is disposed on the end face of the sleeve.

[0008] Optionally, the sealing ring is vulcanized and molded onto the end face of the sleeve.

[0009] Optionally, the end face of the sleeve near the sealing ring is constructed as an arc-shaped end face.

[0010] Optionally, the arc-shaped end face is concave towards the valve stem, and the arc-shaped end face has a highest point and a lowest point in the axial direction of the valve stem, wherein the distance from the highest point to the valve stem is greater than the distance from the lowest point to the valve stem.

[0011] Optionally, a positioning groove is provided at the end of the flow channel, one end of the sleeve is inserted into the positioning groove, and the other end of the sleeve is provided with the sealing ring.

[0012] Optionally, the anti-contamination plug structure further includes a fastener, the plug having a mounting hole arranged perpendicular to the flow channel opening, the sleeve having a threaded hole corresponding to the mounting hole, and the fastener passing through the mounting hole and being threadedly connected to the threaded hole.

[0013] Optionally, the inner diameter of the sleeve is equal to the orifice diameter of the flow channel.

[0014] Based on the above technical solutions, this disclosure also provides a dual shut-off plug valve, including the above-mentioned anti-pollution plug structure.

[0015] Through the above technical solution, the anti-contamination plug structure of this disclosure has a sealing ring at the flow channel inlet. When the double-off plug valve is in the open state, the sealing ring seals against the inner cavity of the valve body, constructing a continuous and effective protective barrier. This prevents impurities from entering the gap between the plug and the inner cavity of the valve body at the source, avoiding the accumulation of impurities in the lower part of the valve cavity. This reduces the risk of impurities scratching the valve body sealing surface and the plug surface, ensuring the surface integrity of the valve body and the plug, and allowing the anti-contamination plug to maintain good sealing performance for a long time. Secondly, since impurities cannot enter the gap between the plug and the inner cavity of the valve body, the plug will not experience abnormal wear due to impurities getting stuck during rotation, effectively maintaining the flexibility and accuracy of the plug rotation. At the same time, it avoids the situation where impurities accumulate and hinder the downward pressure of the plug, ensuring that the double-off plug valve can operate smoothly and accurately during the closing process, without the sealing failure caused by jamming, thus maintaining the opening and closing performance and sealing reliability of the double-off plug valve for a long time.

[0016] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the anti-contamination plug structure provided in the embodiments of this disclosure;

[0019] Figure 2This is a schematic diagram of the installation of the anti-contamination plug structure and valve body provided in the embodiments of this disclosure.

[0020] Explanation of reference numerals in the attached drawings: 1. Valve stem; 2. Plug; 21. Flow channel; 211. Positioning groove; 22. Mounting hole; 3. Sealing ring; 4. Valve body; 41. Inner cavity; 5. Sleeve; 51. Arc-shaped end face; 511. Highest point; 512. Lowest point; 52. Threaded hole; 6. Fastener. Detailed Implementation

[0021] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0022] In this disclosure, unless otherwise stated, in the following description, when referring to the accompanying drawings, the same reference numerals in different drawings denote the same or similar elements, unless otherwise explained. The foregoing definitions are for explanation and illustration only and should not be construed as limiting the present disclosure.

[0023] According to exemplary embodiments of this disclosure, reference is made to Figure 1 and Figure 2 As shown, an anti-pollution plug structure is provided for use in a double shut-off plug valve. The anti-pollution plug structure includes a valve stem 1, a plug 2, and a sealing ring 3. The plug 2 is connected to the valve stem 1. Sealing rings 3 are provided at the flow passages 21 on both sides of the plug 2. The sealing rings 3 are arranged coaxially with the flow passages 21. The sealing rings 3 are configured to seal against the inner cavity 41 of the valve body 4 when the double shut-off plug valve is in the open state.

[0024] Through the above technical solution, the anti-contamination plug structure of this disclosure is provided with a sealing ring 3 at the flow channel 21. When the double shut-off plug valve is in the open state, the sealing ring 3 seals against the inner cavity 41 of the valve body 4, constructing a continuous and effective protective barrier. This can prevent impurities from entering the gap between the plug 2 and the inner cavity 41 of the valve body 4 at the source, avoiding the accumulation of impurities in the lower part of the valve cavity, reducing the risk of scratches on the sealing surface of the valve body 4 and the surface of the plug 2 by impurities, ensuring the surface integrity of the valve body 4 and the plug 2, and enabling the anti-contamination plug 2 to maintain good sealing performance for a long time. Secondly, since impurities cannot enter the gap between the plug 2 and the inner cavity 41 of the valve body 4, the plug 2 will not experience abnormal wear due to impurities getting stuck during rotation, effectively maintaining the flexibility and accuracy of the plug 2's rotation. At the same time, it avoids the situation where impurities accumulate and hinder the downward pressure of the plug 2, ensuring that the double shut-off plug valve can operate smoothly and accurately during the closing process, without the problem of sealing failure caused by jamming, thus maintaining the opening and closing performance and sealing reliability of the double shut-off plug valve for a long time.

[0025] According to exemplary embodiments of this disclosure, referring to Figure 1 and Figure 2 As shown, the flow channel 21 is detachably equipped with a sleeve 5, and a sealing ring 3 is mounted on the sleeve 5. By using a detachable sleeve 5 to mount the sealing ring 3, when the sealing ring 3 is worn or damaged, it is only necessary to remove the sleeve 5 and replace it with a new sleeve 5 with the sealing ring 3, without having to replace the entire plug 2, which greatly reduces maintenance costs and replacement difficulty, and improves the convenience of maintenance.

[0026] According to exemplary embodiments of this disclosure, referring to Figure 1 As shown, the sealing ring 3 is disposed on the end face of the sleeve 5. This arrangement allows the sealing ring 3 to contact the inner cavity 41 of the valve body 4 more directly, ensuring the reliability of the seal.

[0027] According to an exemplary embodiment of this disclosure, the sealing ring 3 is vulcanized onto the end face of the sleeve 5. Vulcanization ensures a tight bond between the sealing ring 3 and the sleeve 5, significantly improving the connection strength and preventing the sealing ring 3 from detaching during long-term use. This enhances the stability and reliability of the sealing ring 3 and extends its service life.

[0028] In this disclosure, when the sealing ring 3 is vulcanized, only the sleeve 5 needs to be placed in the vulcanizing machine for vulcanization, and then the vulcanized sleeve 5 with the sealing ring 3 is installed on the valve 2. The sleeve 5 has a small structural size and light weight, which reduces the processing difficulty compared to vulcanizing the entire valve 2.

[0029] According to exemplary embodiments of this disclosure, referring to Figure 1 As shown, the end face of the sleeve 5 near the sealing ring 3 is constructed as an arc-shaped end face 51. The arc-shaped end face 51 makes the contact between the sealing ring 3 and the inner cavity 41 of the valve body 4 more gentle. During the opening and closing of the valve, it can reduce the friction and wear between the sealing ring 3 and the inner cavity 41 of the valve body 4, further extending the service life of the sealing ring 3, while also ensuring the sealing effect.

[0030] According to exemplary embodiments of this disclosure, referring to Figure 1 and Figure 2As shown, the arc-shaped end face 51 is concave towards the valve stem 1, and the arc-shaped end face 51 has a highest point 511 and a lowest point 512 in the axial direction of the valve stem 1. The distance from the highest point 511 to the valve stem 1 is greater than the distance from the lowest point 512 to the valve stem 1. Understandably, during the opening process, the double shut-off plug valve performs a combination of rotation and downward pressure. Through the above settings, the plug 2 is made into a conical structure that is wider at the top and narrower at the bottom. This ensures that during the rotation of the plug 2, the sealing ring 3 is completely out of contact with the inner cavity 41 of the valve body 4, reducing friction. At the same time, when the plug 2 rotates to the point where the flow port 21 connects with the liquid flow channel of the valve body 4, the plug 2 performs a downward pressure action, making the sealing ring 3 completely fit with the inner cavity 41 of the valve body 4. At this time, the double shut-off plug valve is in the open state, and the plug 2 and the valve body 4 are in sealed contact to prevent impurities from entering the inner cavity 41 of the valve body 4.

[0031] According to exemplary embodiments of this disclosure, referring to Figure 1 As shown, a positioning groove 211 is provided at the end of the flow channel 21. One end of the sleeve 5 is inserted into the positioning groove 211, and a sealing ring 3 is provided on the other end of the sleeve 5. The positioning groove 211 provides accurate positioning for the installation of the sleeve 5, ensuring that the sleeve 5 can precisely fit with the flow channel 21 and guaranteeing the coaxiality of the sealing ring 3 and the flow channel 21, thereby ensuring the sealing effect. At the same time, the insertion method also facilitates the installation and removal of the sleeve 5.

[0032] According to exemplary embodiments of this disclosure, referring to Figure 1 As shown, the anti-contamination stopcock structure also includes a fastener 6. The stopcock 2 has a mounting hole 22 arranged perpendicularly to the flow channel 21, and the sleeve 5 has a threaded hole 52 corresponding to the mounting hole 22. The fastener 6 passes through the mounting hole 22 and is threadedly connected to the threaded hole 52. By fixing the sleeve 5 to the stopcock 2 with the fastener 6, the installation firmness of the sleeve 5 can be further improved, preventing the sleeve 5 from loosening or falling off during operation, and ensuring the reliability of the entire anti-contamination stopcock structure.

[0033] In this disclosure, each sleeve 5 can be connected to the plug 2 by two or more fasteners 6 to ensure the reliability of the connection between the sleeve 5 and the plug 2. This disclosure does not impose any specific limitations on this.

[0034] According to exemplary embodiments of this disclosure, referring to Figure 1 As shown, the inner diameter of the sleeve 5 is equal to the orifice diameter of the flow channel 21. This arrangement ensures smooth flow of the medium through the flow channel 21 and the sleeve 5, avoids local resistance caused by inconsistent inner diameters, reduces energy loss during medium flow, and also prevents eddies from forming at the connection point, reducing the accumulation of impurities at that location.

[0035] Based on the above technical solutions, this disclosure also provides a dual shut-off plug valve, including the above-mentioned anti-contamination plug structure. This dual shut-off plug valve possesses all the beneficial effects of the above-mentioned anti-contamination plug structure, which will not be elaborated upon here.

[0036] Reference Figure 1 and Figure 2 The installation and use process of the anti-pollution plug structure disclosed herein are detailed below:

[0037] Installation process: Connect the plug 2 to the valve stem 1 by welding or threading to ensure a firm connection. Simultaneously, install sealing rings 3 at the flow channels 21 on both sides of the plug 2 using vulcanization molding. Then, insert the sleeve 5 with the sealing rings 3 into the positioning groove 211 of the plug 2, ensuring that the sealing rings 3 and the flow channels 21 are coaxially arranged. Next, use fasteners 6 (e.g., screws) to connect the sleeve 5 to the plug 2. Finally, assemble the plug 2 with the sealing rings 3 and valve stem 1 installed into the valve body 4, ensuring that the plug 2 can rotate freely within the inner cavity 41 of the valve body 4, and that the sealing rings 3 can seal against the inner cavity 41 of the valve body 4 when the plug 2 is in the open state.

[0038] Usage: When the double shut-off plug valve needs to be opened, rotate the valve stem 1. The valve stem 1 drives the plug 2 to rotate until the flow port 21 corresponds to the liquid flow channel of the valve body 4. The plug 2 moves down, connecting the flow port 21 with the liquid flow channel of the valve body 4. At this time, the sealing rings 3 at the flow ports 21 on both sides of the plug 2 seal against the inner cavity 41 of the valve body 4, effectively preventing impurities in the medium from entering the gap between the plug 2 and the inner cavity 41 of the valve body 4, thus playing an anti-contamination role and ensuring that the medium can pass smoothly through the flow port 21.

[0039] When the double shut-off plug valve needs to be closed, rotate the valve stem 1 in the opposite direction so that the plug 2 rotates to the position where the medium passage between the flow port 21 and the valve body 4 is disconnected. During the closing process, the rotation of the plug 2 will not be hindered by impurities, because the impurities have been blocked by the sealing ring 3 in the open state and will not enter the gap between the plug 2 and the valve body 4, thereby ensuring that the double shut-off plug valve can be closed smoothly, achieving effective sealing and preventing the flow of medium.

[0040] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0041] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0042] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A contamination-resistant plug structure applied to a double shut-off plug valve, characterized in that, The anti-pollution plug structure includes a valve stem (1), a plug (2), and a sealing ring (3). The plug (2) is connected to the valve stem (1). The sealing ring (3) is provided at the flow port (21) on both sides of the plug (2). The sealing ring (3) is coaxially arranged with the flow port (21). The sealing ring (3) is configured to seal against the inner cavity (41) of the valve body (4) when the double shut-off plug valve is in the open state.

2. The anti-contamination stopcock structure according to claim 1, characterized in that, The flow channel (21) is detachably provided with a sleeve (5), and the sealing ring (3) is provided on the sleeve (5).

3. The anti-contamination stopcock structure according to claim 2, characterized in that, The sealing ring (3) is disposed on the end face of the sleeve (5).

4. The anti-contamination stopcock structure according to claim 3, characterized in that, The sealing ring (3) is vulcanized and formed on the end face of the sleeve (5).

5. The anti-contamination stopcock structure according to claim 4, characterized in that, The end face of the sleeve (5) near the sealing ring (3) is constructed as an arc-shaped end face (51).

6. The anti-contamination plug structure according to claim 5, characterized in that, The arc-shaped end face (51) is concave towards the valve stem (1), and the arc-shaped end face (51) has a highest point (511) and a lowest point (512) in the axial direction of the valve stem (1). The distance from the highest point (511) to the valve stem (1) is greater than the distance from the lowest point (512) to the valve stem (1).

7. The anti-contamination stopcock structure according to any one of claims 2 to 6, characterized in that, The flow channel (21) has a positioning groove (211) at one end, one end of the sleeve (5) is inserted into the positioning groove (211), and the other end of the sleeve (5) is provided with the sealing ring (3).

8. The anti-contamination stopcock structure according to claim 7, characterized in that, The anti-pollution plug structure also includes a fastener (6). The plug (2) is provided with a mounting hole (22) arranged perpendicularly to the flow channel (21). The sleeve (5) is provided with a threaded hole (52) corresponding to the mounting hole (22). After the fastener (6) passes through the mounting hole (22), it is threadedly connected to the threaded hole (52).

9. The anti-contamination stopcock structure according to claim 2, characterized in that, The inner diameter of the sleeve (5) is equal to the diameter of the flow channel (21).

10. A double shut-off plug valve, characterized in that, Includes the anti-contamination plug structure according to any one of claims 1 to 9.

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