A stop valve combination for fracturing conditions

Abstract

The present invention belongs to the technical field of fracturing operation, and discloses a plug-stop combination valve under fracturing working conditions. The plug-stop combination valve under fracturing working conditions includes a valve body, a plug valve and a check valve. The valve body is provided with a flow channel along its axial direction, and a sub-flow channel is coaxially provided in the middle of the flow channel, and the diameter of the sub-flow channel is larger than the diameter of the flow channel; the plug valve is provided on the valve body, and the plug valve has a connecting position and a closing position that can open or close the flow channel; the check valve is provided on one side of the plug valve along the first direction, and the check valve includes a rocker arm and a valve disc, one end of the rocker arm is pivotally connected to the valve body, and the other end is connected to the valve disc, and the medium flowing along the first direction can push the valve disc so that the medium can flow through the sub-flow channel; the medium flowing back along the second direction can push the valve disc to the connection between the flow channel and the sub-flow channel so that the flow channel is blocked; the first direction is opposite to the second direction, and both are parallel to the axial direction of the valve body. The combination valve can not only control the flow channel on and off according to demand, but also prevent the medium from flowing back.

Description

Technical Field

[0001] The invention relates to the technical field of fracturing operations, and in particular to a stopper combination valve under fracturing conditions. Background Art

[0002] In the fracturing process of oil and gas well exploitation, high and low pressure manifolds are required. The equipment needs to pump the sand-containing fracturing fluid into the low-pressure manifold through a sand mixing truck, and then the sand-containing fracturing fluid is sucked from the low-pressure manifold and pressurized by the fracturing truck, and then pumped out to the high-pressure manifold, and then the pressure is transmitted to the wellhead. However, in this equipment, if the fracturing pump truck suddenly stops running, backflow will occur. Due to the high backflow pressure, high-pressure backflow of mixed sand will impact the equipment, thus affecting the normal use of the entire fracturing operation and reducing the service life of the equipment.

[0003] Therefore, there is an urgent need for a stopper combination valve under fracturing conditions, which can not only control the opening and closing of the flow channel according to actual needs, but also effectively prevent the backflow of high-pressure medium, thereby ensuring the efficiency of fracturing operations. Summary of the invention

[0004] The purpose of the present invention is to provide a stopper combination valve under fracturing conditions, so as to control the opening and closing of the flow channel according to actual needs, and at the same time effectively prevent the backflow of high-pressure medium, thereby ensuring the efficiency of fracturing operations.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A stopper combination valve for fracturing operation, comprising:

[0007] The valve body is provided with a flow channel along its axial direction, a sub-flow channel is coaxially provided in the middle of the flow channel, and the diameter of the sub-flow channel is larger than the diameter of the flow channel;

[0008] A plug valve is arranged on the valve body, and the plug valve has a connecting position and a closing position capable of opening or closing the flow channel;

[0009] A check valve is arranged on one side of the plug valve along the first direction, and the check valve includes a rocker arm and a valve flap. One end of the rocker arm is pivotally connected to the valve body, and the other end is connected to the valve flap. The medium flowing along the first direction can push the valve flap so that the medium can flow in the sub-channel; the medium flowing back along the second direction can push the valve flap to the connection between the channel and the sub-channel so that the channel is blocked; the first direction is opposite to the second direction, and both are parallel to the axial direction of the valve body.

[0010] Preferably, the diameter of the valve flap gradually decreases along the first direction.

[0011] Preferably, a connecting portion is formed at one end of the valve disc, and one end of the rocker arm is sleeved on the outer periphery of the connecting portion and is detachably connected via a locking member.

[0012] Preferably, a flexible gasket is provided between the rocker arm and the locking member.

[0013] Preferably, the check valve also includes a first valve cover and a sealing support, the sealing support is arranged in the valve body, and the rocker arm is pivotally connected to the sealing support, the first valve cover is arranged at the top of the sealing support and is detachably connected to the valve body, and a first seal is arranged between the first valve cover and the valve body.

[0014] Preferably, the plug valve also includes a valve stem and a plug, the plug is arranged in the valve body, and a plurality of first sealing members are arranged between the plug and the valve body; the plug has the connecting position and the closing position, one end of the valve stem is connected to the plug, and the other end is located outside the valve body, and the valve stem can drive the plug to rotate so that the plug can switch between the connecting position and the closing position.

[0015] Preferably, the stopcock valve further comprises a second valve cover, wherein the second valve cover is arranged at the bottom end of the stopcock, and a second sealing member is arranged between the second valve cover and the stopcock.

[0016] Preferably, the plug valve includes a sand prevention ring, which is coaxially arranged on the inner periphery of the flow channel and located at the connection between the plug and the valve body. A sand discharge groove is arranged on the outer periphery of the sand prevention ring, and the extension direction of the sand discharge groove is the same as the axial direction of the flow channel. A sand discharge hole is arranged in the sand discharge groove, and the axis of the sand discharge hole can form an angle X with the first direction, and the angle X is an obtuse angle.

[0017] Preferably, a plurality of the sand discharge grooves are arranged along the circumference of the sand control ring, and a plurality of the sand discharge holes are arranged in each of the sand discharge grooves at intervals along the first direction.

[0018] Preferably, the anti-sand ring is provided on both sides of the plug along the axial direction of the flow channel.

[0019] Beneficial effects of the present invention:

[0020] The present invention discloses a plug-stop combination valve under fracturing conditions. The plug-stop combination valve under fracturing conditions includes a valve body, a plug valve and a check valve. The valve body is provided with a flow channel along its axial direction, and a sub-flow channel is coaxially provided in the middle of the flow channel, and the diameter of the sub-flow channel is larger than the diameter of the flow channel; the plug valve is provided on the valve body, and the plug valve has a connecting position and a closing position that can open or close the flow channel; the check valve is provided on one side of the plug valve along a first direction, and the check valve includes a rocker arm and a valve disc, one end of the rocker arm is pivotally connected to the valve body, and the other end is connected to the valve disc, and the medium flowing along the first direction can push the valve disc so that the medium can flow through the sub-flow channel; the medium flowing back along the second direction can push the valve disc to the connection between the flow channel and the sub-flow channel so that the flow channel is blocked; the first direction is opposite to the second direction, and both are parallel to the axial direction of the valve body.

[0021] In the above structure, the plug valve can control the opening and closing of the flow channel by rotating, so as to meet the actual needs. When the medium refluxes, the medium can push the valve disc along the second direction and push it to the connection between the sub-flow channel and the flow channel, and close the flow channel to prevent the medium from refluxing through the flow channel, thereby ensuring the service life of the equipment connected to the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the stopper combination valve provided by the present invention under the fracturing condition;

[0023] Figure 2 It is a structural schematic diagram of the sand control ring provided by the present invention;

[0024] Figure 3 yes Figure 2 The cross-section along the AA direction;

[0025] Figure 4 yes Figure 3 The cross-section along the BB direction;

[0026] Figure 5 It is a structural schematic diagram of the medium provided by the present invention flowing through the sand discharge hole.

[0027] In the figure:

[0028] 10. valve body; 11. flow channel; 111. sub-flow channel;

[0029] 20. Plug valve; 21. Anti-sand ring; 211. Sand discharge groove; 212. Sand discharge hole; 22. Valve stem; 23. Plug; 231. Communication hole; 24. Second valve cover; 25. Driving wheel; 26. Plug support; 27. Blocking piece;

[0030] 30. Check valve; 31. Rocker arm; 32. Valve disc; 321. Connecting part; 33. First valve cover; 34. Blocking support; 35. Locking piece; 36. Rotating lifting ring; 37. Flexible gasket; 38. Connecting seat;

[0031] 40. O-ring;

[0032] 50. Limiting parts;

[0033] 60. a first sealing member;

[0034] 70. Second sealing member. DETAILED DESCRIPTION

[0035] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0036] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0039] In order to solve the problem that high-pressure medium in the transmission pipeline is prone to backflow, thereby affecting the operation efficiency, this embodiment provides a stopper combination valve under fracturing conditions. Figure 1 As shown, the plug-stop combination valve under fracturing conditions includes a valve body 10, a plug valve 20 and a check valve 30; wherein the valve body 10 is provided with a flow channel 11 along its axial direction, a sub-flow channel 111 is coaxially provided in the middle of the flow channel 11, and the diameter of the sub-flow channel 111 is larger than the diameter of the flow channel 11; the plug valve 20 is provided on the valve body 10, and the plug valve 20 has a connecting position and a closing position that can open or close the flow channel 11; the check valve 30 is provided at the plug valve 20 along the first direction On one side, the check valve 30 includes a rocker arm 31 and a valve flap 32. One end of the rocker arm 31 is pivotally connected to the valve body 10, and the other end is connected to the valve flap 32. The medium flowing along the first direction can push the valve flap 32 to allow the medium to flow in the sub-channel 111; the medium flowing back along the second direction can push the valve flap 32 to the connection between the channel 11 and the sub-channel 111, so that the channel 11 is blocked; the first direction is opposite to the second direction, and both are parallel to the axial direction of the valve body 10.

[0040] When using the plug-check combination valve under the above-mentioned fracturing working condition, one end close to the plug valve 20 is connected to the fracturing pump truck, and the other end is connected to the high-pressure manifold. When the medium needs to be passed into the high-pressure manifold, the plug valve 20 is rotated to the connecting position, which can open the flow channel 11. At this time, the medium can flow in the flow channel 11, and when the medium flows to the check valve 30, the medium will generate a thrust in the first direction on the valve flap 32, and the other end of the rocker arm 31 is pivoted to the valve body 10, and the diameter of the sub-flow channel 111 is larger than the diameter of the flow channel 11. Therefore, the thrust along the first direction can make the valve flap 32 rotate around the pivot position following the rocker arm 31, thereby opening the connection between the flow channel 11 and the sub-flow channel 111, and the medium can flow to the high-pressure manifold through the sub-flow channel 111. When medium backflow occurs, the medium will impact the valve flap 32 along the second direction, thereby generating a driving force on the valve flap 32 along the second direction, and then the rocker arm 31 rotates around the pivot position, so that the valve flap 32 is re-blocked to the connection between the sub-channel 111 and the channel 11. After the channel 11 is blocked, the medium cannot flow reversely through the channel 11, thereby ensuring operating efficiency.

[0041] In addition, if Figure 1 As shown, the diameter of the valve flap 32 gradually decreases along the first direction. This arrangement can increase the force bearing area of ​​the reflux medium and the valve flap 32, thereby ensuring that the valve flap 32 can be quickly pushed and re-sealed to the connection between the flow channel 11 and the sub-flow channel 111 when the medium refluxes, thereby ensuring a good anti-backflow effect.

[0042] It should be noted here that, for the convenience of installation, a connection seat 38 is provided at the connection between the flow channel 11 and the sub-flow channel 111, and the check valve 30 can be quickly installed through the connection seat 38. In addition, a plurality of O-rings 40 are provided on the periphery of the check valve 30, and the O-rings 40 can prevent the medium from entering the gap between the connection seat 38 and the valve body 10. In addition, for the convenience of fixing the O-ring 40, a plurality of limiters 50 are provided at the corresponding positions of the valve body 10, and each limiter 50 forms a limit groove, and the O-ring 40 can be correspondingly clamped in the limit groove, thereby completing the effective fixation of the O-ring 40.

[0043] like Figure 1 As shown, the diameter of the valve disc 32 gradually decreases along the first direction and forms a connecting portion 321. One end of the rocker arm 31 is sleeved on the outer periphery of the connecting portion 321 and is detachably connected through a locking member 35. This structure is not only convenient for installation, but also forms a detachable connection relationship between the rocker arm 31 and the valve disc 32, which is convenient for subsequent maintenance and replacement; it should be noted here that the locking member 35 is a nut, which has a simple structure and low price, and can effectively reduce the difficulty of installation and manufacturing cost.

[0044] In addition, if Figure 1 As shown, a flexible gasket 37 is further provided between the rocker arm 31 and the locking member 35. This arrangement can reduce the collision between the rocker arm 31 and the locking member 35, thereby extending the service life. In this embodiment, the flexible gasket 37 can be made of any material such as rubber silicone, as long as it can effectively absorb the collision force between the rocker arm 31 and the locking member 35, and no other limitation is made in this example.

[0045] To facilitate installation, Figure 1 As shown, the check valve 30 also includes a first valve cover 33 and a blocking support 34. The blocking support 34 is arranged in the valve body 10, and the rocker arm 31 is pivotally connected to the blocking support 34. The first valve cover 33 is arranged at the top of the blocking support 34 and is detachably connected to the valve body 10, and a first sealing member 60 is arranged between the first valve cover 33 and the valve body 10. In the above structure, the rocker arm 31 is arranged on the blocking support 34 instead of being directly installed on the valve body 10, which reduces the difficulty of installation; in addition, the first valve cover 33 is used to cover it inside the valve body 10, which can fully protect the rocker arm 31. At the same time, the detachable connection relationship formed between the first valve cover 33 and the valve body 10 also facilitates subsequent maintenance and replacement of parts. Finally, the first sealing member 60 is arranged between the valve body 10 and the first valve cover 33, which can ensure the airtightness inside the valve body 10.

[0046] It is worth noting that, in this embodiment, the first valve cover 33 is detachably connected to the valve body 10 through a nut. The first sealing member 60 is a metal sealing ring, which is more resistant to high temperature and high pressure and has a wider range of applications. In addition, a rotating ring 36 is provided at the top of the first valve cover 33. The rotating ring 36 is not only convenient for lifting, but also can be rotated to a horizontal position after installation, thereby reducing the external space occupation and improving the aesthetics.

[0047] To make the cock 20 more convenient to rotate, Figure 1 As shown, the plug valve 20 also includes a valve stem 22 and a plug 23. The plug 23 is arranged in the valve body 10, and a plurality of first sealing members 60 are arranged between the plug 23 and the valve body 10. The plug 23 has a connecting position and a closing position. One end of the valve stem 22 is connected to the plug 23, and the other end thereof is located outside the valve body 10. The valve stem 22 can drive the plug 23 to rotate so that the plug 23 can switch between the connecting position and the closing position.

[0048] It should be noted that part of the plug 23 is located in the valve body 10, and part of it is located in the flow channel 11. The part of the plug 23 located in the flow channel 11 is provided with a connecting hole 231. When the flow channel 11 needs to be opened, the valve stem 22 can be rotated to drive the plug 23 to rotate around its own axis. When the connecting hole 231 is coaxial with the flow channel 11, the medium can flow through the connecting hole 231. When closing the plug valve 20, it is only necessary to rotate the valve stem 22 so that the connecting hole 231 of the plug 23 is perpendicular to the flow channel 11. At this time, the plug 23 can cut off the flow channel 11, thereby completing the closure. The structure is simple and easy to operate. The flow channel 11 can be opened and closed only by the valve stem 22. In addition, a plurality of first sealing members 60 are also provided between the plug 23 and the valve body 10, which can further ensure the airtightness inside the flow channel 11. It should be noted here that the first sealing member 60 is a metal sealing ring, which has the characteristics of high temperature and high pressure resistance and a long service life. In addition, a plurality of limit members 50 are provided on the valve body 10, and each limit member 50 forms a limit groove, and the first sealing member 60 can be correspondingly engaged in the corresponding limit groove, thereby preventing the first sealing member 60 from falling off, and having strong practicality.

[0049] It is further explained that a driving wheel 25 is also provided at one end of the valve stem 22 located outside the valve body 10, and the use of the driving wheel 25 can make the rotation process more labor-saving. It should be explained here that in this embodiment, the driving wheel 25 is a bevel gear drive, which has a high transmission ratio, a large pressure bearing capacity and a more stable transmission. In addition, the plug valve 20 also includes a plug support 26, which is provided outside the valve body 10 and can ensure the stability of the rotation of the valve stem 22.

[0050] In addition, if Figure 1As shown, the plug valve 20 also includes a second valve cover 24, which is arranged at the bottom end of the plug 23, and a second sealing member 70 is arranged between the second valve cover 24 and the plug 23. It should be noted here that the second sealing member 70 is a sealing arc sheet. As the valve stem 22 drives the plug 23 to rotate, the bottom of the plug 23 will generate sliding friction with the second valve cover 24, and the sealing arc sheet has high wear resistance and corrosion resistance, thereby being able to produce a good plug effect. In addition, a blocking member 27 is also arranged in the gap formed by the sealing arc sheet, the second valve cover 24 and the valve body 10, so as to ensure a good sealing effect.

[0051] Considering the presence of sand in the medium, if the sand enters the gap between the plug 23 and the valve body 10, the plug effect will be reduced and the service life will be shortened. Figure 2-Figure 5 As shown, the plug valve 20 also includes a sand prevention ring 21, which is coaxially arranged on the inner periphery of the flow channel 11 and located at the connection between the plug 23 and the valve body 10. A sand discharge groove 211 is arranged on the outer periphery of the sand prevention ring 21, and the extension direction of the sand discharge groove 211 is the same as the axial direction of the flow channel 11. A sand discharge hole 212 is arranged in the sand discharge groove 211, and the axis of the sand discharge hole 212 can form an angle X with the first direction, and the angle X is an obtuse angle. When the medium enters the flow channel 11 along the first direction under the conveyance of the fracturing pump truck, the first part of the medium flows through the middle of the sand-proof ring 21, and a small part of the medium flows counterclockwise along the sand-discharging hole 212 under the action of pressure; in addition, the second part of the medium enters the sand-discharging groove 211 on the outer periphery of the sand-proof ring 21, and part of the medium entering the sand-discharging groove 211 flows clockwise along the sand-discharging hole 212, and then the medium flowing clockwise forms convection with the medium flowing counterclockwise, and the impact force generated after the convection can vibrate the sand-proof ring 21, so that the inner wall of the sand-proof ring 21 can prevent the sand in the medium from entering the gap between the valve body 10 and the plug 23, and at the same time, due to the vibration of the sand-proof ring 21, the sand accumulated near it (the connection between the valve body 10 and the plug 23) can be driven to obtain power and disperse, and then can continue to flow along the first direction with the medium. The structure of the sand-proof ring 21 is simple, and the effect of preventing sand from entering the gap is good.

[0052] It should be noted here that, in this embodiment, sand-proof rings 21 are provided on both sides of the plug 23 along the axial direction of the flow channel 11. This arrangement can simultaneously discharge sand from both sides of the plug 23, thereby ensuring that when the plug 23 rotates, no accumulated sand particles on both sides enter the gap between the plug 23 and the valve body 10, thereby ensuring a good sand discharge effect and plug effect.

[0053] In order to further increase the sand removal effect, Figure 2-Figure 3As shown, a plurality of sand discharge grooves 211 are arranged along the circumference of the sand control ring 21, and a plurality of sand discharge holes 212 are arranged in each sand discharge groove 211 along the first direction. This arrangement can increase the vibration effect of the sand control ring 21, thereby completing sand discharge more effectively.

[0054] The following is a description of the use process of the stopper combination valve under fracturing conditions in this embodiment with reference to the accompanying drawings:

[0055] First, connect one end of the valve body 10 close to the plug valve 20 to the fracturing pump truck, and the other end to the high-pressure manifold. Use the driving wheel 25 to turn the plug valve 23 to put the plug valve 20 in the connected position, ensuring that the medium can flow through the plug valve 20 in the first direction; secondly, the impact force of the medium in the first direction can make the valve flap 32 away from the connection port between the flow channel 11 and the sub-flow channel 111, thereby ensuring that the medium can pass through the sub-flow channel 111 and enter the high-pressure manifold; the flowing medium can vibrate the sand prevention ring 21 to ensure that sand particles will not accumulate at the connection between the plug valve 23 and the valve body 10. If liquid reflux occurs in the high-pressure manifold, the refluxed medium impacts the valve flap 32 in the second direction, which will cause the valve flap 32 to re-block the connection port between the flow channel 11 and the sub-flow channel 111, thereby preventing the refluxed high-pressure liquid from impacting the fracturing pump truck.

[0056] In summary, the use of the stopper combination valve in the fracturing condition in this embodiment can not only control the opening and closing of the flow channel 11 according to actual needs, but also prevent the backflow of high-pressure medium and avoid the accumulation of sand in the gap between the valve body 10 and the plug 23, thereby ensuring operating efficiency.

[0057] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A stopper combination valve for fracturing operation, characterized in that: include: A valve body (10) is provided with a flow channel (11) along its axial direction, a sub-flow channel (111) is coaxially provided in the middle of the flow channel (11), and the diameter of the sub-flow channel (111) is greater than the diameter of the flow channel (11); A plug valve (20) is arranged on the valve body (10), the plug valve (20) having a connecting position and a closing position capable of opening or closing the flow channel (11); A check valve (30) is arranged on one side of the plug valve (20) along a first direction, the check valve (30) comprising a rocker arm (31) and a valve flap (32), one end of the rocker arm (31) being pivotally connected to the valve body (10), and the other end being connected to the valve flap (32), a medium flowing along the first direction can push the valve flap (32) so that the medium can flow in the sub-flow channel (111); a medium flowing back along the second direction can push the valve flap (32) to the connection between the flow channel (11) and the sub-flow channel (111), so that the flow channel (11) is blocked; the first direction is opposite to the second direction, and both are parallel to the axial direction of the valve body (10); The plug valve (20) further comprises a valve stem (22) and a plug (23); the plug (23) is arranged in the valve body (10), and a plurality of first sealing members (60) are arranged between the plug (23) and the valve body (10); The plug valve (20) comprises a sand prevention ring (21), the sand prevention ring (21) being coaxially arranged on the inner periphery of the flow channel (11) and being located at the connection between the plug (23) and the valve body (10), a sand discharge groove (211) being arranged on the outer periphery of the sand prevention ring (21), and the extension direction of the sand discharge groove (211) being the same as the axial direction of the flow channel (11), a sand discharge hole (212) being arranged in the sand discharge groove (211), and the axis of the sand discharge hole (212) being able to form an angle X with the first direction, and the angle X being an obtuse angle.

2. The stopper combination valve for fracturing operation according to claim 1, characterized in that: The diameter of the valve flap (32) gradually decreases along the first direction.

3. The stopper combination valve for fracturing operation according to claim 2, characterized in that: A connecting portion (321) is formed at one end of the valve flap (32), and one end of the rocker arm (31) is sleeved on the outer periphery of the connecting portion (321) and is detachably connected via a locking member (35).

4. The stopper combination valve for fracturing operation according to claim 3, characterized in that: A flexible gasket (37) is provided between the rocker arm (31) and the locking member (35).

5. The stopper combination valve for fracturing operation according to any one of claims 1 to 4, characterized in that: The check valve (30) further comprises a first valve cover (33) and a blocking support (34); the blocking support (34) is arranged in the valve body (10), and the rocker arm (31) is pivotally connected to the blocking support (34); the first valve cover (33) is arranged at the top end of the blocking support (34) and is detachably connected to the valve body (10); and a first sealing member (60) is arranged between the first valve cover (33) and the valve body (10).

6. The stopper combination valve for fracturing operation according to any one of claims 1 to 4, characterized in that: The plug (23) has the connecting position and the closing position. One end of the valve stem (22) is connected to the plug (23), and the other end is located outside the valve body (10). The valve stem (22) can drive the plug (23) to rotate, so that the plug (23) switches between the connecting position and the closing position.

7. The stopper combination valve for fracturing operation according to claim 6, characterized in that: The plug valve (20) further comprises a second valve cover (24), wherein the second valve cover (24) is arranged at the bottom end of the plug (23), and a second sealing member (70) is arranged between the second valve cover (24) and the plug (23).

8. The stopper combination valve for fracturing operation according to claim 6, characterized in that: A plurality of the sand discharge grooves (211) are arranged along the circumference of the sand control ring (21), and a plurality of the sand discharge holes (212) are arranged at intervals along the first direction in each of the sand discharge grooves (211).

9. The stopper combination valve for fracturing operation according to claim 8, characterized in that: The anti-sand rings (21) are arranged on both sides of the plug (23) along the axial direction of the flow channel (11).

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