Pigging sealing ball valve

Abstract

The invention relates to a pigging sealing ball valve, which is a forced sealing ball valve, comprises a valve body 10, a valve core 20, a first valve clack driving piece 30, a second valve clack driving piece 40, a sealing valve clack 50 and a valve seat 60, and is characterized in that the valve seat is provided with a first sealing ring 70, the first sealing ring 70 slides in the valve seat, and when the valve is in an open state, the first sealing ring 70 is in a closed state; the first sealing ring 70 abuts against the first valve clack driving piece 30 and the second valve clack driving piece 40 in a floating mode, and when the valve is in a closed state, the first sealing ring abuts against the sealing valve clack 50. The forced sealing valve has the beneficial effects that the sealing ring and the sealing layer are adopted to block a gap in the valve, so that the sealing performance of the forced sealing valve is enhanced, and a pipe cleaner obtains enough differential pressure thrust to pass through the forced sealing valve. And the first sealing ring is matched with the second sealing ring, so that the sealing performance of the valve is improved, and meanwhile, the forced sealing function and reliability of the valve can be guaranteed.

Description

Technical Field

[0001] This invention pertains to forced sealing valves, and more particularly to a pigging sealing ball valve capable of performing pigging operations. Background Technology

[0002] Forced-sealing valves possess outstanding sealing performance, ensuring reliable valve closure. Chinese invention patent (application number 202011319032 X) discloses a forced-sealing valve operating device; Chinese utility model patent (application number CN 2021217521001) discloses a DBB forced-sealing ball valve drive structure; and Chinese utility model patent (application number CN2024200225521) discloses a short-stroke DBB forced-sealing ball valve. In the forced-sealing valves disclosed in these documents, the sealing valve disc is mounted on a first valve disc drive and a second valve disc drive. During valve closure, the valve core drives the first valve disc drive, the second valve disc drive, and the sealing valve disc to rotate synchronously. When the first valve disc drive, the second valve disc drive, and the sealing valve disc reach the closed position, they stop rotating. The valve core then drives the first and second valve disc drive to separate, causing the sealing valve disc to press against the valve seat, achieving forced sealing. Forced-sealing valves are installed on pipelines, which typically require periodic cleaning to remove accumulated impurities. A common pipeline cleaning method involves ball-pass cleaning: a cylindrical rubber or polyurethane pig is inserted into the pipeline, its outer diameter rubbing against the inner wall. The pressure differential propels the pig forward, pushing impurities to the next drain outlet. In current forced-seal valve structures, gaps are maintained between the first and second valve disc actuators and the valve seat to achieve frictionless rotation of the sealing valve disc and valve seat. Gaps also exist between the first and second valve disc actuators and between the valve core and the first and second valve disc actuators. Due to these gaps, when the valve is open, the pig entering the forced-seal valve creates a short circuit in the pipeline medium flow. Pressurized fluid flows from one end of the valve through these gaps to the other, causing a drop in pressure differential. Without sufficient thrust to push the pig through the forced-seal valve, the pig remains trapped inside. Summary of the Invention

[0003] The purpose of this invention is to provide a pigging sealing ball valve that enables the pig to pass through a forced sealing valve.

[0004] To achieve the above objectives, the technical solution of the present invention is: a pigging sealing ball valve, wherein the ball valve is a forced sealing ball valve, comprising a valve body 10, a valve core 20, a first valve disc drive 30, a second valve disc drive 40, a sealing valve disc 50, and a valve seat 60, characterized in that the valve seat is provided with a first sealing ring 70, which slides within the valve seat. In the open state of the valve, the first sealing ring 70 floats and presses against the first valve disc drive 30 and the second valve disc drive 40. In the closed state and the forced sealing state of the valve, the first sealing ring presses against the sealing valve disc 50.

[0005] Furthermore, an elastic structure for the first sealing ring is provided in which the first sealing ring 70 is provided with a first ring plate 71, and the valve seat is provided with a pressing spring 72 that presses against the first ring plate. The pressing spring 72 presses against the first ring plate 71, so that the first sealing ring 70 floats and presses against the first valve disc drive member and the second valve disc drive member or the sealing valve disc.

[0006] Furthermore, in order to ensure the sealing performance of the valve, a first sealing ring 73 is provided between the first sealing ring 70 and the valve seat 60.

[0007] Furthermore, to prevent damage to the valve's forced sealing components, the valve seat is provided with a second sealing ring 80, which is nested on the first sealing ring 70. In the open state of the valve, the second sealing ring 80 is disengaged from the first valve disc drive 30 and the second valve disc drive 40. In the closed state of the valve, the second sealing ring 80 is pressed between the sealing valve disc 50 and the valve seat 60, while the first sealing ring 70 floats and presses against the sealing valve disc 50.

[0008] Furthermore, to avoid damage to the sealing surface of the sealing valve disc, the sealing valve disc 50 is provided with a sealing groove 51, which is an annular groove recessed into the spherical surface 52 of the sealing valve disc. In the closed state of the valve, the second sealing ring 80 is pressed into the sealing groove 51.

[0009] Furthermore, in order to reliably disengage the sealing valve disc from the second sealing ring, the second sealing ring 80 is fixedly mounted on the valve seat 60.

[0010] Furthermore, in order to ensure the sealing performance of the valve, a second sealing ring 81 is provided between the second sealing ring 80 and the first sealing ring 70.

[0011] Furthermore, in order to improve the sealing performance between the valve core and the first valve disc drive and the second valve disc drive, the valve core 20 is provided with a valve core ball 21 in the center, and a flow channel 22 is provided in the center of the valve core ball. The first valve disc drive 30 and the second valve disc drive 40 are provided with inner spherical surfaces corresponding to the valve core ball 21. A spherical sealing layer 23 is provided on the inner spherical surface, and the spherical sealing layer 23 fills the gap between the valve core ball and the inner spherical surface.

[0012] Furthermore, in order to improve the sealing performance between the first valve disc drive and the second valve disc drive, a valve disc drive sealing gasket 31 is provided between the corresponding surfaces of the first valve disc drive 30 and the second valve disc drive 40. When the valve is open, the valve disc drive sealing gasket 31 fills the gap between the corresponding surfaces of the first valve disc drive 30 and the second valve disc drive 40.

[0013] The beneficial effects of this invention are as follows: By using a sealing ring and a sealing layer to seal the gaps inside the valve, the sealing performance of the forced-seal valve is enhanced, allowing the pig to obtain sufficient differential pressure thrust to pass through the forced-seal valve. The use of a first sealing ring in conjunction with a second sealing ring protects the second sealing ring 80 from damage by pigging impurities when the valve is open for pigging. Furthermore, during the opening and closing process, the first valve disc drive, the second valve disc drive, and the sealing valve disc maintain non-contact rotation relative to the second sealing ring 80. This further improves the forced-seal life of the valve while achieving the pigging performance of the forced-seal ball valve.

[0014] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the present invention; Figure 2 This is an overall cross-sectional view of the invention, with the valve in the open state; Figure 3 This is an overall cross-sectional view of the invention, with the valve in the closed state; Figure 4 This is an exploded view of the valve seat, the first sealing ring, and the second sealing ring of the present invention; Figure 5 It is an exploded view of the valve seat and valve body at both ends of the valve; Figure 6 This is an exploded view of the sealing valve disc and the forced sealing structure of the present invention; Figure 7 This is an exploded view of the structure of the valve core, the first valve disc drive, the second valve disc drive, and the sealing valve disc 50 of the present invention. Figure 8 This is a schematic diagram of the valve in the open state; Figure 9 This is the book Figure 8 A magnified view of part A; Figure 10 This is a schematic diagram showing the sealing valve disc rotating to the closed position; Figure 11 This is the book Figure 10 A magnified view of part B; Figure 12 This is a schematic diagram of a valve in a forced-sealing state; Figure 13 This is the book Figure 12 A magnified view of part C.

[0016] Standard parts such as connecting bolts are omitted from the attached diagram. Detailed Implementation

[0017] Example: like Figures 1 to 13 A pigging sealing ball valve includes a valve body 10, a valve core 20, a first valve disc drive 30, a second valve disc drive 40, a sealing valve disc 50, and a valve seat 60.

[0018] The pigging sealing ball valve in this embodiment is a forced sealing valve. The valve core 20 has a valve core ball 21 in the center, and the valve core ball has a flow channel 22 in the center. The outer contours of the first valve disc drive 30 and the second valve disc drive 40 are hemispherical, and the inner sides of the first valve disc drive 30 and the second valve disc drive 40 are provided with inner spherical surfaces (e.g., Figure 7 The first valve drive 30 has a semi-circular first flow channel hole 33, the second valve drive 40 has a semi-circular second flow channel hole 43, and the sealing valve 50 has a sealing valve spherical surface 52. The first valve drive 30 has first drive tracks 32 on both sides to drive the sealing valve 50, and the first drive tracks 32 are inclined to the rotation axis of the valve core 20. The second valve drive 40 has second drive tracks 42 on both sides to drive the sealing valve 50, and the second drive tracks 42 are inclined to the rotation axis of the valve core. The first valve drive 30 and the second valve drive 40 each have a sealing valve 50 on both sides, and the sealing valve 50 has a first valve guide groove 53 and a second valve guide groove 54. The first valve guide groove 53 and the second valve guide groove 54 are connected to the first drive track 32 and the second drive track 42 respectively using a dovetail structure. The first valve drive 30, the second valve drive 40, and the sealing valve 50 on both sides rotate synchronously around the rotation axis of the valve core. When the valve is open, the first valve disc drive 30, the second valve disc drive 40, and the two side sealing valve discs 50 retract to form a spherical shape.

[0019] The valve core 20 has a first drive shaft 26 and a second drive shaft 27 on both sides of the flow channel. The first and second drive shafts are threaded, and the threads of the first and second drive shafts rotate in opposite directions. The first valve disc drive 30 is connected to the first drive shaft 26 of the valve core through an internal thread, and the second valve disc drive 40 is connected to the second drive shaft 27 of the valve core through an internal thread.

[0020] The valve core 20 is connected to the valve stem 25, and the valve stem drives the valve core to rotate. The valve stem is provided with a drive head 24, which has a locking groove 24a and an opening lever 24b. The locking groove 24a is recessed into the cylindrical surface of the drive head, and the opening lever 24b protrudes from the cylindrical surface of the drive head.

[0021] The first valve disc drive component is provided with a locking block 34, which is a sector-shaped block protruding from the first valve disc drive component. The locking block is provided with a locking body guide hole 35, and a locking body 36 is provided in the locking body guide hole 35. In this embodiment, the locking body is a sphere. The locking body 36 can move in the locking body guide hole 35, so that the locking body protrudes from the inner diameter or the outer diameter of the locking block.

[0022] The valve body is provided with a valve cover 11, and the valve cover 11 is provided with a toggle ring groove 12 and an unlocking groove 13.

[0023] In the open state of the valve, the first flow channel hole 33 of the first valve disc drive 30, the second flow channel hole 43 of the second valve disc drive 40, and the flow channel 22 of the valve core are coaxial and correspond to the axis of the valve seat, thus putting the valve in a conducting state. In the closed state of the valve, the sealing valve disc rotates to a position corresponding to the axis of the valve seat, thus closing the valve. When the first valve disc drive 30, the second valve disc drive 40, and the sealing valve disc 50 rotate between the open and closed positions, the locking body 36 locks the connection between the first valve disc drive 30 and the valve core 20, and the valve stem drives the first valve disc drive 30, the second valve disc drive 40, and the sealing valve disc 50 to rotate within the valve body via the valve core. When the first valve disc drive 30, the second valve disc drive 40, and the sealing valve disc 50 rotate to the closed position, the valve stem continues to rotate in the closing direction, causing the locking body 36 to unlock the connection between the first valve disc drive 30 and the valve core 20, and lock the connection between the first valve disc drive 30 and the valve cover 11. The first valve disc drive 30, the second valve disc drive 40, and the sealing valve disc 50 stop rotating, while the valve core continues to rotate, driving the first valve disc drive 30 and the second valve disc drive 40 to move in the separation direction, driving the sealing valve disc 50 to press against the valve seat, thereby achieving forced sealing of the valve.

[0024] The above is a brief description of the structure and function of the forced sealing valve. For more specific technical details, please refer to the following patent documents: Chinese Invention Patent (Application No. 202011319032 X) "A Forced Sealing Valve Operating Device", Chinese Utility Model Patent (Application No. CN 2021217521001) "A DBB Forced Sealing Ball Valve Drive Structure", and Chinese Utility Model Patent (Application No. CN 2024200225521) "A Short-Stroke DBB Forced Sealing Ball Valve".

[0025] Forced-sealing valves are installed on pipelines that typically require pigging to remove accumulated impurities. A common pigging method involves inserting a cylindrical rubber or polyurethane pig into the pipeline. The outer diameter of the pig rubs against the inner wall of the pipeline, and the pressure difference propels the pig forward, pushing impurities to the next collection bucket for discharge. Existing forced-sealing valves, to achieve frictionless rotation of the first and second valve disc actuators and the sealing valve disc against the valve seat, have gaps between the first and second valve disc actuators and the valve seat; there are also gaps between the first and second valve disc actuators, and between the valve core and the first and second valve disc actuators. Due to these gaps, when the valve is open, the pig entering the forced-sealing valve creates a pressure differential short circuit, causing the pressure difference to drop. Without sufficient thrust to push the pig through the forced-sealing valve, it becomes stuck inside. To solve these technical problems, this invention improves the forced-sealing valve, enabling it to seal even when open.

[0026] In this embodiment, a first sealing ring 70 is provided inside the valve seat 60. The first sealing ring 70 is an annular sleeve structure, and the first sealing ring 70 slides in conjunction with the valve seat 60, sliding axially within the valve seat. To prevent leakage from gaps, a first sealing ring 73 is provided between the first sealing ring 70 and the valve seat 60. In the open state of the valve, the inner hole 74 of the first sealing ring 70 corresponds to the flow channel 22 at the center of the valve core ball. The first sealing ring 70 is provided with a first ring plate 71, and the valve seat 60 is provided with a pressing spring 72 that presses against the first ring plate. The pressing spring 72 presses against the first ring plate 71. In the open state of the valve, the first sealing ring 70 floats and presses against the first valve disc drive member 30 and the second valve disc drive member 40. In the closed state of the valve, the first sealing ring 70 presses against the sealing valve disc.

[0027] As a means of forced sealing of a valve, the sealing valve disc 50 can fix the first sealing ring 70 tightly against the valve seat 60, and the valve is forced to seal by the pressure seal between the sealing valve disc 50 and the first sealing ring 70. However, the drawback of this method is that since the first sealing ring 70 maintains elastic contact with the first valve disc drive 30 and the second valve disc drive 40, some impurities are inevitably present between the first sealing ring 70 and the first valve disc drive 30 and the second valve disc drive 40. These impurities will wear down the contact surface between the first sealing ring 70 and the first valve disc drive 30 and the second valve disc drive 40 during valve operation, affecting the forced sealing effect of the valve.

[0028] As an improved technical solution, in this embodiment, a second sealing ring 80 is provided inside the valve seat, and the second sealing ring 80 is disposed between the valve seat 60 and the first sealing ring 70. The second sealing ring 80 is nested on the first sealing ring 70, and the inner hole of the second sealing ring is slidably engaged with the first sealing ring. A second sealing ring 81 is provided between the inner hole of the second sealing ring 80 and the first sealing ring. When the valve is in the open state, a separation gap 82 is left between the second sealing ring 80 and the first valve disc drive member 30 and the second valve disc drive member 40 (e.g., ...). Figure 9 As shown in the diagram, this avoids friction between the second sealing ring 80 and the first valve disc drive 30 and the second valve disc drive 40, and also avoids motion friction with the sealing valve disc 50. When the valve is closed, the sealing valve disc 50 presses against the second sealing ring, and the second sealing ring 80 is pressed tightly between the valve seat 60 and the sealing valve disc 50, achieving forced sealing of the valve.

[0029] In this embodiment, the second sealing ring 80 is fixed on the valve seat 60, and the second sealing ring 80 is installed on the valve seat 60 with an interference fit. In the non-forced sealing state of the valve, a gap is maintained between the second sealing ring 80 and the first valve disc drive 30, the second valve disc drive 40, and the sealing valve disc 50, to avoid motion friction.

[0030] To prevent wear on the sealing surface of the sealing valve disc 50, the sealing valve disc 50 is provided with a sealing groove 51, which is an annular groove recessed into the spherical surface 52 of the sealing valve disc. In the closed state of the valve, the sealing groove 51 corresponds to the second sealing ring 80, and the bottom surface of the sealing groove serves as the sealing surface of the sealing valve disc. When the valve is forcibly sealed, the second sealing ring 80 is pressed against the sealing groove 51.

[0031] Since the sealing groove 51 is an annular groove and the inner diameter of the sealing groove 51 is larger than the diameter of the first sealing ring 70, the first sealing ring 70 will not be embedded in the sealing groove 51, so that the bottom surface of the sealing groove will not rub against the first sealing ring. This structure will also not affect the movement of the spherical surface 52 of the sealing valve disc on the first sealing ring 70.

[0032] The valve core 20 has a valve core ball 21 at its center, and a flow channel 22 at the center of the valve core ball. The first valve disc drive 30 and the second valve disc drive 40 have inner spherical surfaces corresponding to the valve core ball (e.g., Figure 7 The inner spherical surface 44 of the second valve disc drive is provided with a spherical sealing layer 23. The spherical sealing layer 23 is made of a material with sealing function, such as rubber or elastic metal sheet. The spherical sealing layer 23 is bonded to the inner spherical surface 44 and fills the gap between the valve core ball and the inner spherical surfaces of the first valve disc drive and the second valve disc drive.

[0033] A valve disc drive sealing gasket 31 is provided between the corresponding surfaces of the first valve disc drive 30 and the second valve disc drive 40. The valve disc drive sealing gasket 31 can be disposed on the end face of the first valve disc drive 30 and / or the end face of the second valve disc drive 40. In this embodiment, the valve disc drive sealing gasket 31 is disposed on the end face of the first valve disc drive 30. The valve disc drive sealing gasket 31 is made of a sealing material, such as rubber or an elastic metal sheet. In the open state of the valve, the valve disc drive sealing gasket 31 fills the gap between the corresponding surfaces of the first valve disc drive 30 and the second valve disc drive 40.

[0034] In this embodiment, the first sealing ring 70 achieves a seal between the first valve disc drive 30, the second valve disc drive 40, and the valve seat 60, providing the necessary conditions for the pigging operation. The second sealing ring 80 achieves a seal between the valve disc and the valve seat, realizing the forced sealing function of the valve.

[0035] When the valve is open, such as Figure 8 , Figure 9 As shown, the first flow channel hole 33 of the first valve disc drive 30, the second flow channel hole 43 of the second valve disc drive 40, and the flow channel 22 of the valve core are coaxial, forming a flow channel hole with the same diameter as the pipeline and corresponding to the axis of the valve seat, so the valve is in the conducting state. Under the action of the top pressure spring 72, the first sealing ring 70 floats and presses against the first valve disc drive 30 and the second valve disc drive 40, sealing the gap between the first valve disc drive 30 and the second valve disc drive 40 and the valve seat 60. In addition, the sealing effect of the spherical sealing layer 23 and the valve disc drive sealing gasket 31 can effectively improve the damping effect of the valve structure on the pipeline fluid, so that the pig can pass through the valve under the action of the pressure difference on one side.

[0036] During the transition between the open and closed states of the valve, the first valve disc drive 30, the second valve disc drive 40, and the sealing valve disc 50 rotate synchronously. The first sealing ring 70 makes spherical elastic contact and frictional movement with the first valve disc drive 30, the second valve disc drive 40, and the sealing valve disc 50. After the second sealing ring 80 retracts into the first sealing ring 70, it disengages from the first valve disc drive 30, the second valve disc drive 40, and the sealing valve disc 50, thus avoiding wear on the sealing contact surfaces.

[0037] When the valve is closed, such as Figure 10 , Figure 11 As shown, the sealing valve disc 50 rotates to the position corresponding to the first sealing ring 70, and the first sealing ring 70 presses against the sealing valve disc 50.

[0038] When the valve is forcibly sealed, such as Figure 12 , Figure 13 As shown, the sealing valve disc 50 presses against the first sealing ring 70, compressing the pressure spring 72. The first sealing ring 70 elastically moves backward until the sealing valve disc 50 presses against the second sealing ring 80. The second sealing ring 80 is then pressed tightly between the sealing valve disc 50 and the valve seat 60, achieving forced sealing of the valve. The first sealing ring 70 floats and presses against the sealing valve disc 50.

[0039] To ensure the smooth operation of valve pigging, this invention enables the forced-seal valve to have sufficient pipeline medium damping function. When the pig enters the valve, it creates a sufficient pressure difference between the inlet and outlet sides of the valve, allowing the pig to pass through the valve smoothly.

Claims

1. A pigging sealing ball valve, wherein the ball valve is a forced sealing ball valve, comprising a valve body (10), a valve core (20), a first valve disc drive (30), a second valve disc drive (40), a sealing valve disc (50), and a valve seat (60), characterized in that, The valve seat is provided with a first sealing ring (70), which slides within the valve seat. In the open state of the valve, the first sealing ring (70) floats and presses against the first valve disc drive (30) and the second valve disc drive (40). In the closed state and the forced sealing state of the valve, the first sealing ring presses against the sealing valve disc (50).

2. The pigging sealing ball valve according to claim 1, characterized in that, The first sealing ring (70) is provided with a first ring plate (71), and the valve seat is provided with a pressing spring (72) that presses against the first ring plate. The pressing spring (72) presses against the first ring plate (71), so that the first sealing ring (70) floats and presses against the first valve disc drive and the second valve disc drive or the sealing valve disc.

3. The pigging sealing ball valve according to claim 1, characterized in that, A first sealing ring (73) is provided between the first sealing ring (70) and the valve seat (60).

4. The pigging sealing ball valve according to claim 1, characterized in that, The valve seat is provided with a second sealing ring (80), which is nested on the first sealing ring (70). In the open state of the valve, the second sealing ring (80) is disengaged from the first valve disc drive (30) and the second valve disc drive (40). In the closed state of the valve, the second sealing ring (80) is pressed between the sealing valve disc (50) and the valve seat (60), and the first sealing ring (70) floats and presses against the sealing valve disc (50).

5. The pigging sealing ball valve according to claim 4, characterized in that, The sealing valve disc (50) is provided with a sealing groove (51), which is an annular groove recessed into the spherical surface (52) of the sealing valve disc. When the valve is closed, the second sealing ring (80) is pressed into the sealing groove (51).

6. The pigging sealing ball valve according to claim 4, characterized in that, The second sealing ring (80) is fixedly installed on the valve seat (60).

7. The pigging sealing ball valve according to claim 4, characterized in that, A second sealing ring (81) is provided between the second sealing ring (80) and the first sealing ring (70).

8. The pigging sealing ball valve according to claim 1, characterized in that, The valve core (20) has a valve core ball (21) in the center, and a flow channel (22) in the center of the valve core ball. The first valve disc drive (30) and the second valve disc drive (40) have inner spherical surfaces corresponding to the valve core ball (21). A spherical sealing layer (23) is provided on the inner spherical surface, and the spherical sealing layer (23) fills the gap between the valve core ball and the inner spherical surface.

9. The pigging sealing ball valve according to claim 1, characterized in that, A valve disc drive sealing gasket (31) is provided between the corresponding surfaces of the first valve disc drive (30) and the second valve disc drive (40). When the valve is open, the valve disc drive sealing gasket (31) fills the gap between the corresponding surfaces of the first valve disc drive (30) and the second valve disc drive (40).

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