An ultra-high pressure on-off switch high life fracturing pipeline sand plug valve

Abstract

The application discloses a sand-preventing plug valve for pipeline used for fracturing with high service life under superhigh pressure and pressure switch, relates to the technical field of oilfield fracturing, and comprises a valve body, a valve seat is symmetrically and sealingly arranged in the valve body, a vice tile is arranged between the valve seats, the valve seat and the vice tile are sealingly arranged through an inner plug strip, a plunger is rotatably arranged in a space surrounded by the valve seat and the vice tile, the valve body can be effectively prevented from being kept in a half-open and half-closed position, high-speed sand-containing fluid can be prevented from being squeezed into a valve cavity and from locally eroding a sealing surface of the plunger and the valve seat, and the sand-preventing effect, safety, operation reliability and service life of the valve under the working condition of superhigh pressure fracturing are remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of oilfield fracturing technology, specifically to a high-pressure, high-life, pipeline sand-proof plug valve for fracturing. Background Technology

[0002] In oil and gas field fracturing operations, pipeline plug valves, as key wellhead control equipment, operate under extreme conditions such as ultra-high pressure (usually greater than 70 MPa), high sand content, highly corrosive media, and frequent pressure switching.

[0003] Existing plug valves generally lack indication or limiting mechanisms for the valve stem rotation angle. During manual opening and closing, operators find it difficult to accurately determine whether the plunger has rotated to the correct position, and are prone to misjudging and leaving the valve in a half-open or half-closed state. In this state, high-speed fracturing fluid containing sand will directly impact the plunger sidewall and valve seat sealing edge at extremely high flow rates, forming strong jet erosion. Furthermore, due to the lack of an effective sand barrier or self-cleaning structure, a large number of proppant sand particles will invade the sealing mating surface and become embedded. The superimposed effect of jet erosion and sand particle abrasion can cause severe damage, scratches, or even jamming of the metal hard sealing surface in a short period of time, leading to valve cavity perforation or internal leakage.

[0004] Secondly, traditional plug valves mostly use rubber or elastomer sealing structures, which are prone to aging, deformation, tearing, or extrusion failure under high pressure, high temperature, and sand erosion, leading to a rapid decline in sealing performance and even leakage accidents. Simultaneously, the plunger and valve seat of conventional plug valves have a rigid fit, lacking floating compensation capability. Under thermal deformation or assembly deviations, local stress concentration easily occurs, accelerating wear and significantly shortening service life. Furthermore, when existing plug valves operate in sand-containing fluids, sand particles easily enter the valve cavity and embed in the sealing surface, causing scratches or jamming. This not only increases the switching torque but may also prevent the valve from opening and closing properly.

[0005] Therefore, it is necessary to design a high-life, ultra-high pressure, live-line sand-proof plug valve for fracturing pipelines to solve the above-mentioned technical problems. Summary of the Invention

[0006] To address the aforementioned issues, this application provides a high-life, ultra-high pressure, live-line sand-proof plug valve for fracturing pipelines. By incorporating a positioning groove on the top platform of the handwheel, along with a push rod, spring, and positioning holes A and B, a mechanical angle limiting mechanism is formed. This allows the valve to automatically lock into position after rotating 90°. During handwheel rotation, the push rod is forced out of the positioning groove, and the spring compresses and releases its limit, allowing the plunger to rotate freely. After the handwheel rotates 90° to its final position, the push rod re-enters the corresponding positioning hole under the spring's reset action, achieving reliable locking in either normally open or normally closed state. This effectively prevents the valve from remaining in a half-open / half-closed position, avoiding localized erosion of the plunger and valve seat sealing surfaces by high-speed sand-containing fluid, and significantly improving the valve's safety, operational reliability, and service life under ultra-high pressure fracturing conditions.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a high-pressure live-line, high-life fracturing pipeline sand-proof plug valve, comprising: a valve body, wherein valve seats are symmetrically and sealed within the valve body, and auxiliary tiles are inserted between the valve seats. The valve seats and the auxiliary tiles are sealed together by an inner insert strip. A plunger is rotatably disposed within the space enclosed by the valve seats and the auxiliary tiles. A slot is formed at the upper end of the plunger, and two positioning holes A are formed in a circumferential array at the upper end of the plunger, each at a 90° angle to the adjacent slot. A through-hole is formed through the plunger in a direction perpendicular to its axis. A cross-shaped slider is inserted into the slot. The cross-shaped slider has two positioning holes B arranged in a circumferential array, each at a 90° angle to the adjacent positioning hole A. The upper end of the cross-shaped slider is positioned and connected to the valve stem, and a handwheel is fixedly installed at the upper end of the valve stem. A T-shaped through hole is opened on the valve body, and a push rod is movably installed in the T-shaped through hole. A spring is sleeved on the circumferential direction of the push rod near the plunger end, and a top cover is fixedly installed on the top of the valve body. The upper end of the push rod extends out of the top cover and periodically cooperates with the handwheel at a 90° angle to realize the opening and closing of the two ends of the valve body with the through port.

[0008] The handwheel includes an inner ring fixedly disposed on the valve stem extending circumferentially from the upper end of the valve body. Four top platforms are fixedly disposed in a circular array on the inner ring. The ends of the top platforms away from the inner ring are all fixedly disposed on the outer ring. The ends of the top platforms near the valve seat are symmetrically provided with arc-shaped portions A. The arc-shaped portions A are connected to each other through platform portions A. Each platform portion A is provided with a positioning groove.

[0009] The top rod includes a shaft movably disposed within the T-shaped through hole. A convex ring is fixedly disposed circumferentially on the shaft, and the convex ring is movable within the T-shaped through hole located between the top cover and the valve body. The spring is sleeved circumferentially on the shaft at the lower end of the convex ring, and an arc-shaped portion B is provided at the top of the shaft, with each arc-shaped portion B corresponding to a positioning groove.

[0010] The lower ends of the shaft are respectively provided corresponding to the positioning hole A and the positioning hole B.

[0011] Furthermore, as a preferred embodiment, the valve seat has a structure in which a cylinder and an arc plate intersect. One cylindrical end face of the valve seat is provided with an outer valve seat seal and an inner valve seat seal. The valve body and the valve seat are sealed together by the outer valve seat seal and the inner valve seat seal. The other cylindrical end face of the valve seat is provided with a sand-blocking ring. The outer circle of the arc plate of the valve seat is provided with a spring groove. A pressure spring is provided in the spring groove. The end of the arc plate is provided with a strip pressing position A, in which the inner strip can be inserted.

[0012] Furthermore, as a preferred embodiment, the outer circumference of the arc-shaped sub-tile is provided with an insertion groove and a grease injection groove. An outer insertion strip can be inserted into the insertion groove, and a grease injection hole is opened in the middle of the sub-tile. An insertion strip pressing position B is provided at the end of the arc-shaped tile, and an inner insertion strip can be inserted into the insertion strip pressing position B. The end face of the sub-tile can be embedded in the valve seat. The inner and outer insertion strips make the sub-tile and the valve seat fit tightly against the plunger.

[0013] Furthermore, as a preferred embodiment, the lower end of the plunger is provided with a cross-shaped grease injection channel groove, and a one-way valve is installed at the lower part of the plunger.

[0014] Furthermore, as a preferred embodiment, a valve cover is fixedly provided at the lower end of the valve seat, a support pad is provided between the plunger and the valve cover, an oil cavity is formed between the support pad and the plunger, and a grease injection valve is fixedly provided on the valve cover. The valve cover is sealed to the valve body through a valve cover seal.

[0015] Furthermore, as a preferred embodiment, the valve stem is circumferentially fixed on the inner ring of the bearing, the outer ring of the bearing is fixed to the interior of the valve body, and a positioning plate and a pressure cap are sequentially arranged between the valve stem and the valve body from top to bottom, with the positioning plate being fixedly mounted on the upper end of the valve body by set screws.

[0016] Furthermore, as a preferred embodiment, the top cover is fixedly mounted on the valve body by positioning screws, and the top cover has a through hole corresponding to the shaft.

[0017] Furthermore, as a preferred embodiment, the inner ring is fixedly disposed in the circumferential direction of the valve stem by a clamping washer and a clamping nut.

[0018] Furthermore, as a preferred embodiment, the cross slider is circumferentially fitted with a sealing seat, the outer circumferential side of the sealing seat is sealed to the valve body through a sealing seat sealing member, and the inner circumferential side of the sealing seat is sealed to the valve stem through a valve stem sealing member.

[0019] Furthermore, as a preferred embodiment, one end of the valve body is connected to a male union and a female union, and a retaining ring is provided between the male union and the female union. The other end of the valve body is provided with a union sealing element.

[0020] Compared with the prior art, the present invention provides a high-life, ultra-high pressure, live-line sand-proof plug valve for fracturing pipelines, which has the following advantages:

[0021] 1. This invention achieves forced and precise locking of the valve's opening and closing states by setting a positioning groove on the top platform of the handwheel and constructing a mechanical 90° limiting mechanism in conjunction with the push rod, spring, and positioning holes A and B. The spring's restoring force drives the push rod to automatically engage with the positioning hole after rotation, preventing the valve from remaining in a half-open or half-closed position. At the same time, by eliminating intermediate opening caused by misoperation, it effectively blocks the conditions for the formation of a directional jet of high-speed sand-containing fracturing fluid, thereby avoiding severe erosion and cutting of the plunger sidewall and valve seat sealing edge by sand particles under the high-pressure jet. Meanwhile, the precise 90° fully open or fully closed position ensures that the sealing surface can achieve maximum specific pressure contact when closed and the flow channel is completely unobstructed when open, greatly reducing the chance of sand particles intruding into the sealing gap and preventing the embedding, scratching, and jamming of hard sand particles on the sealing surface. It not only protects the metal hard sealing surface from sand abrasion damage, but also significantly reduces abnormal switching torque caused by sand accumulation, greatly improving the sealing reliability, erosion resistance and service life of the valve under high sand content and ultra-high pressure fracturing conditions.

[0022] 2. This invention utilizes a combination of valve seat and auxiliary bearings in conjunction with a plunger, completely eliminating rubber seals. It achieves reliable sealing under all operating conditions through a combination of metal hard seals and high-performance polymer composite seals. The valve seat provides primary sealing support and pressure self-reinforcing function. The auxiliary bearings, under the action of the pressure spring and inner and outer inserts, tightly adhere to the plunger surface, forming a uniform contact stress distribution. This effectively compensates for manufacturing errors and thermal deformation, significantly improving sealing stability and erosion resistance. Simultaneously, it avoids the risks of rubber aging, extrusion, or failure under ultra-high pressure, high sand content, and high temperature environments, greatly extending the valve's service life and meeting the engineering requirements of high reliability and long-term maintenance-free operation in fracturing. Attached Figure Description

[0023] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof.

[0024] Figure 1 A schematic diagram of the overall structure of a high-pressure, high-life, pipeline sand-proof plug valve for fracturing;

[0025] Figure 2 This is a schematic diagram of the assembly structure of the valve seat, plunger, and auxiliary bearing in a high-life, ultra-high pressure, live-line, fracturing pipeline sand-proof plug valve.

[0026] Figure 3 for Figure 1 Enlarged structural diagram at point A in the diagram;

[0027] Figure 4 This is a schematic diagram of the handwheel in a high-life, ultra-high pressure, live-line sand-proof plug valve for fracturing pipelines.

[0028] Figure 5 This is a schematic diagram of the top rod in a high-life, ultra-high pressure, live-line, fracturing pipeline sand-proof plug valve;

[0029] Reference numerals: 1. Valve body; 2. Valve seat; 3. Piston; 4. Secondary bearing plate; 5. Pressure spring; 6. Inner insert; 7. Outer insert; 8. External valve seat seal; 9. Internal valve seat seal; 10. Seat seal; 11. Valve stem seal; 12. Valve cover seal; 13. Check valve; 14. Seat; 15. Valve stem; 16. Cross slide block; 17. Bearing; 18. Valve cover; 19. Grease injection valve; 20. Male union; 21. Retaining ring; 22. Female union; 23. Positioning plate; 24. Handwheel; 25. Pressure cap; 26. Pressure gasket; 27. Pressure nut; 28. Set screw; 29. ​​Union seal; 30. 31. Support pad; 32. Sand baffle ring; 33. Top cover; 34. Positioning screw; 35. Top rod; 36. Spring; 17. Positioning hole B; 18. T-shaped through hole; 20. Spring slot; 20. Insert bar pressing position A; 24. Inner ring; 24. Top platform; 24. Outer ring; 30. Slot; 30. Positioning hole A; 30. Through opening; 32. Through hole; 34. Shaft; 34. Convex ring clip; 34. Arc-shaped part B; 40. Grease injection groove; 40. Grease injection hole; 40. Insert bar groove; 40. Insert bar pressing position B; 2421. Arc-shaped part A; 2422. Platform part A; 2423. Positioning groove. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this application, unless otherwise stated, "multiple" means two or more.

[0032] Please see Figures 1-5 This invention provides a high-life, ultra-high pressure, live-line, fracturing pipeline sand-proof plug valve, comprising: a valve body 1, valve seats 2 symmetrically and sealed within the valve body 1, with auxiliary tiles 4 inserted between each valve seat 2, and the valve seats 2 and auxiliary tiles 4 sealed together by an inner insert 6; a plunger 3 rotatably disposed within the space enclosed between the valve seats 2 and auxiliary tiles 4; a slot 301 formed at the upper end of the plunger 3, and two positioning holes A302 arranged in a circumferential array at 90° to adjacent slots 301 at the upper end of the plunger 3; a through-hole 303 extending through the plunger 3 in a direction perpendicular to its axis; and a cross slider 16 inserted within the slot 301. The cross slider 16 has two positioning holes B161 arranged in a circular array, each at a 90° angle to the adjacent positioning hole A302. The upper end of the cross slider 16 is positioned and connected to the valve stem 15, and a handwheel 24 is fixedly installed at the upper end of the valve stem 15. The valve body 1 has a T-shaped through hole 101, and a push rod 34 is movably installed in the T-shaped through hole 101. A spring 35 is sleeved around the end of the push rod 34 near the plunger 3, and a top cover 32 is fixedly installed on the top of the valve body 1. The upper end of the push rod 34 extends out of the top cover 32 and periodically cooperates with the handwheel 24 at a 90° angle to realize the opening and closing of the two ends of the valve body 1 with the through port 303.

[0033] The handwheel 24 includes an inner ring 241 fixedly disposed on the valve stem 15 extending circumferentially from the upper end of the valve body 1. Four top platforms 242 are fixedly disposed in a circular array on the inner ring 241. The ends of the top platforms 242 away from the inner ring 241 are fixedly disposed with an outer ring 243. The ends of the top platforms 242 near the valve seat 2 are symmetrically provided with arc-shaped portions A2421. The arc-shaped portions A2421 are connected to each other through platform portions A2422. Each platform portion A2422 is provided with a positioning groove 2423.

[0034] The top rod 34 includes a shaft 341 movably disposed within the T-shaped through hole 101. A convex ring clip 342 is fixedly disposed circumferentially on the shaft 341, and the convex ring clip 342 is movably positioned within the T-shaped through hole 101 located between the top cover 32 and the valve body 1. The spring 35 is sleeved circumferentially on the shaft 341 located at the lower end of the convex ring clip 342, and an arc-shaped portion B343 is disposed at the top of the shaft 341, with each arc-shaped portion B343 corresponding to the positioning groove 2423.

[0035] The lower end of the shaft 341 is respectively provided with corresponding positioning holes A302 and B161.

[0036] With the above technical solution, initially, taking the push rod 34 locked in the positioning groove 2423 and the two ends of the through port 303 not connected to the valve body 1 as an example (the through port 303 is perpendicular to the axis of the valve body 1), the spring 35 is in a compressed state, the lower end of the push rod 34 is locked in the positioning hole A302, and the valve is in a normally closed state; when it is necessary to open the valve, the handwheel 24 is rotated clockwise or counterclockwise. During the rotation of the handwheel 24, the push rod 34 exits the positioning groove 2423, and the spring 35 is in a compressed state. When the spring 35 returns to its original deformation, the push rod 34 no longer limits the plunger 3. When the handwheel 24 is rotated to 90°, the push rod 34 is engaged with the positioning groove 2423 on the other top platform 242. The spring 35 is compressed, the push rod 34 descends and engages with the positioning hole B161 again, and the port 303 is connected to both ends of the valve body 1. At this time, the valve is normally open. When it is necessary to close the valve again, the handwheel 24 is rotated to 90°. The valve is opened and closed by rotating it 90° repeatedly.

[0037] Based on the above technical solution, by setting a positioning groove 2423 on the top platform 242 of the handwheel 24, and constructing a mechanical 90° limiting mechanism in conjunction with the push rod 34, spring 35, positioning hole A302, and positioning hole B161, a forced and precise locking of the valve opening and closing state is achieved. The spring 35's restoring force drives the push rod 34 to automatically embed into the positioning groove 2423 after rotating to the correct position, preventing the valve from remaining in a half-open or half-closed position. At the same time, by eliminating the intermediate opening caused by misoperation, the conditions for the formation of a directional jet of high-speed sand-containing fracturing fluid are effectively blocked, thereby avoiding severe erosion and cutting of the plunger 3 sidewall and valve seat 2 sealing edge by sand particles under the high-pressure jet. Meanwhile, the precise 90° fully open or fully closed position ensures that the sealing surface can achieve maximum specific pressure fit when closed and the flow channel is completely unobstructed when open, greatly reducing the chance of sand particles intruding into the sealing gap and preventing hard sand particles from being embedded, scratched, or stuck on the sealing surface. It not only protects the metal hard sealing surface from sand abrasion damage, but also significantly reduces abnormal switching torque caused by sand accumulation, greatly improving the sealing reliability, erosion resistance and service life of the valve under high sand content and ultra-high pressure fracturing conditions.

[0038] In one possible implementation, the valve seat 2 has a structure in which a cylinder and an arc plate intersect. One cylindrical end face of the valve seat 2 is provided with an outer valve seat seal 8 and an inner valve seat seal 9. The valve body 1 and the valve seat 2 are sealed together by the outer valve seat seal 8 and the inner valve seat seal 9. The other cylindrical end face of the valve seat 2 is provided with a sand-blocking ring 31. The outer circle of the arc plate of the valve seat 2 is provided with a spring groove 201. A pressure spring 5 is provided in the spring groove 201. The pressure spring 5 can ensure the initial sealing of the plug valve, the sealing float between the valve seat 2 and the plunger 3, and the sand-proof effect of the crack. The end of the arc plate is provided with a strip pressing position A202, in which the inner strip 6 can be inserted.

[0039] It should be added that the valve seat outer seal 8 and valve seat inner seal 9 can adopt the commonly used PEEK + alloy lip sealing method to achieve the sealing capacity of ultra-high pressure.

[0040] In one possible implementation, the outer circumference of the arc plate of the secondary tile 4 is provided with an insertion groove 403 and a grease injection groove 401. An outer insertion strip 7 can be inserted into the insertion groove 403, and a grease injection hole 402 is opened in the middle of the secondary tile 4. An insertion strip pressing position B404 is provided at the end of the arc plate, and an inner insertion strip 6 can be inserted into the insertion strip pressing position B404. The end face of the secondary tile 4 can be embedded in the valve seat 2. The inner insertion strip 6 and the outer insertion strip 7 make the secondary tile 4 and the valve seat 2 fit tightly against the plunger 3.

[0041] By adopting the above technical solution, the valve seat 2 and the auxiliary pad 4 are combined with the plunger 3, and the rubber seals are completely eliminated. Reliable sealing under all working conditions is achieved through metal hard seal and high-performance polymer composite seal. Among them, the valve seat 2 provides main sealing support and pressure self-reinforcing function. The auxiliary pad 4 is tightly attached to the surface of the plunger 3 under the action of the pressure spring 5 and the inner and outer inserts 6 and 7, forming a uniform contact stress distribution, effectively compensating for manufacturing errors and thermal deformation, significantly improving sealing stability and erosion resistance, and avoiding the risk of rubber aging, extrusion or failure under ultra-high pressure, high sand content and high temperature environment. This greatly extends the service life of the valve and meets the engineering requirements of high reliability and long-term maintenance-free operation in fracturing.

[0042] In one possible implementation, the lower end of the plunger 3 is provided with a cross-shaped grease injection channel groove, and a one-way valve 13 is installed at the lower part of the plunger 3. The one-way valve 13 can prevent external sand-containing media from flowing back into the grease injection channel, and can also release the valve chamber pressure to realize a low-torque switching plug valve.

[0043] In one possible implementation, a valve cover 18 is fixedly provided at the lower end of the valve seat 2, and a support pad 30 is provided between the plunger 3 and the valve cover 18. The support pad 30 can typically be made of rubber and plastic composite material, which can absorb the slight vibration of the plunger 3 under high pressure impact and reduce fatigue damage to metal parts. An oil cavity is formed between the support pad 30 and the plunger 3, and a grease injection valve 19 is fixedly provided on the valve cover 18. The valve cover 18 is sealed to the valve body 1 through the valve cover seal 12, so as to realize the directional and efficient delivery of sealing grease to the key sealing surface. After the grease injection valve 19 is opened, the grease flows along the oil cavity, the grease injection groove 401 and the grease injection hole 402 to the upper sealing interface of the plunger 3, which can ensure that the sealing grease is accurately delivered to the main sealing area between the plunger 3 and the valve seat 2 and the secondary bearing 4, avoiding the problem of grease loss or uneven distribution in traditional grease injection methods, and improving lubrication and sealing efficiency.

[0044] In one possible implementation, the valve stem 15 is circumferentially fixed on the inner ring of the bearing 17, the outer ring of the bearing 17 is fixed to the interior of the valve body 1, and a positioning plate 23 and a pressure cap 25 are sequentially arranged between the valve stem 15 and the valve body 1 from top to bottom. The positioning plate 23 is fixed on the upper end of the valve body 1 by a set screw 28, thereby restricting the axial movement of the valve stem 15.

[0045] In one possible implementation, the top cover 32 is fixedly mounted on the valve body 1 by positioning screws 33, and the top cover 32 is provided with a through hole 321 corresponding to the shaft 341, and the shaft 341 can move along the through hole 321.

[0046] In one possible implementation, the inner ring 241 is fixedly disposed on the circumference of the valve stem 15 by a clamping washer 26 and a clamping nut 27, and the handwheel 24 is provided to facilitate the rotation of the valve stem 15.

[0047] In one possible implementation, the cross slider 16 is circumferentially fitted with a sealing seat 14. The outer circumferential side of the sealing seat 14 is sealed to the valve body 1 through a sealing seat sealing member 10, and the inner circumferential side of the sealing seat 14 is sealed to the valve stem 15 through a valve stem sealing member 11, thereby ensuring the sealing between the upper end of the plunger 3 and the valve body 1.

[0048] It should be added that the sealing seat seal 10, valve stem seal 11, and valve cover seal 12 can adopt a PTFE-reinforced + PEEK + alloy lip combination sealing method to achieve the sealing capacity of ultra-high pressure.

[0049] In one possible implementation, one end of the valve body 1 is connected to a male union 20 and a female union 22, respectively. A retaining ring 21 is provided between the male union 20 and the female union 22. The other end of the valve body 1 is provided with a union seal 29. At the fracturing site, the union connection (male union 20, female union 22) can complete the connection or disconnection of the valve and the high-pressure pipeline within minutes. It is particularly suitable for working conditions that require frequent replacement, emergency repair or equipment movement, significantly shortening downtime. The retaining ring 21 (usually an elastic retaining ring or a limiting retaining ring) is installed between the male union 20 and the female union 22 to limit the relative axial displacement between the two, and to prevent the union connection from loosening or even detaching due to vibration, thermal expansion and contraction or pressure pulsation. Under ultra-high pressure alternating loads of 70 MPa or above, this structure ensures the mechanical reliability and safety of the connection. The union seal 29 at the other end of the valve body 1 typically uses a metal-to-metal conical seal or a PEEK / PTFE reinforced lip seal, which can provide a highly reliable metal / composite seal and adapt to extreme working conditions.

[0050] In practice, initially, taking the push rod 34 engaged with the positioning groove 2423 and the port 303 not connected to the two ends of the valve body 1 as an example, the spring 35 is compressed, the lower end of the push rod 34 is engaged with the positioning hole A302, and the valve is normally closed. When the valve needs to be opened, the handwheel 24 is turned clockwise or counterclockwise. During the rotation of the handwheel 24, the push rod 34 exits the positioning groove 2423, the spring 35 returns to its original shape, and the push rod 34 no longer limits the plunger 3. When the handwheel 24 is rotated to 90°, the push rod 34 is engaged with the positioning groove 2423 on the other top platform 242 again, the spring 35 is compressed, the push rod 34 descends and engages with the positioning hole B161, and the port 303 is connected to the two ends of the valve body 1, at which point the valve is normally open. When the valve needs to be closed again, the handwheel 24 is rotated to 90°.

[0051] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A high-pressure, high-life, pipeline sand-proof plug valve for fracturing under ultra-high pressure, characterized in that... It includes: a valve body (1), in which valve seats (2) are symmetrically and sealed, and auxiliary tiles (4) are inserted between the valve seats (2). The valve seats (2) and the auxiliary tiles (4) are sealed by an inner insert (6). A plunger (3) is rotatably arranged in the space enclosed between the valve seats (2) and the auxiliary tiles (4). A slot (301) is opened at the upper end of the plunger (3), and two positioning holes A (302) are opened in a circumferential array at the upper end of the plunger (3), which are both set at 90° with the adjacent slots (301). A through-hole (303) is opened through the plunger (3) in a direction perpendicular to the axis. A cross slider (16) is inserted in the slot (301), and the cross slider (16) is arranged in a circumferential array. Two positioning holes B (161) are provided, each at a 90° angle to the adjacent positioning hole A (302). The upper end of the cross slider (16) is positioned and connected to the valve stem (15), and a handwheel (24) is fixedly provided at the upper end of the valve stem (15). A T-shaped through hole (101) is provided on the valve body (1), and a push rod (34) is movably provided in the T-shaped through hole (101). A spring (35) is sleeved around the end of the push rod (34) near the plunger (3), and a top cover (32) is fixedly provided on the top of the valve body (1). The upper end of the push rod (34) extends out of the top cover (32) and periodically cooperates with the handwheel (24) at a 90° angle to realize the connection and closure of the two ends of the valve body (1) with the through port (303). The handwheel (24) includes an inner ring (241) fixedly disposed on the valve stem (15) extending circumferentially from the upper end of the valve body (1). Four top platforms (242) are fixedly disposed in a circular array on the inner ring (241). The ends of the top platforms (242) away from the inner ring (241) are fixedly disposed with the outer ring (243). The ends of the top platforms (242) near the valve seat (2) are symmetrically disposed with arc-shaped portions A (2421). The arc-shaped portions A (2421) are connected to each other through platform portions A (2422). Each platform portion A (2422) is provided with a positioning groove (2423). The top rod (34) includes a shaft (341) movably disposed within the T-shaped through hole (101). A convex ring clip (342) is fixedly disposed circumferentially on the shaft (341), and the convex ring clip (342) is movably disposed within the T-shaped through hole (101) located between the top cover (32) and the valve body (1). The spring (35) is sleeved circumferentially on the shaft (341) located at the lower end of the convex ring clip (342), and an arc-shaped portion B (343) is disposed at the top of the shaft (341). The arc-shaped portions B (343) are all disposed corresponding to the positioning groove (2423); and The lower end of the shaft (341) is respectively provided with the positioning hole A (302) and the positioning hole B (161).

2. The ultra-high pressure live switch long-life fracturing pipeline sand-proof plug valve according to claim 1, characterized in that, The valve seat (2) is a structure in which a cylinder and an arc plate intersect. The valve seat (2) is provided with an outer valve seat seal (8) and an inner valve seat seal (9) on one side of the cylindrical end face. The valve body (1) and the valve seat (2) are sealed together by the outer valve seat seal (8) and the inner valve seat seal (9). The valve seat (2) is provided with a sand baffle (31) on the other side of the cylindrical end face. The outer circle of the arc plate of the valve seat (2) is provided with a spring groove (201). A pressure spring (5) is provided in the spring groove (201). The end of the arc plate is provided with a strip pressing position A (202). The inner strip (6) can be inserted into the strip pressing position A (202).

3. The ultra-high pressure live switch long-life fracturing pipeline sand-proof plug valve according to claim 1, characterized in that, The outer circumference of the arc plate of the sub-tile (4) is provided with a strip groove (403) and a grease injection groove (401). An outer strip (7) can be inserted into the strip groove (403), and a grease injection hole (402) is opened in the middle of the sub-tile (4). The end of the arc plate is provided with a strip pressing position B (404). An inner strip (6) can be inserted into the strip pressing position B (404). The end face of the sub-tile (4) can be embedded in the valve seat (2). The inner strip (6) and the outer strip (7) make the sub-tile (4) and the valve seat (2) fit tightly against the plunger (3).

4. The ultra-high pressure live switch long-life fracturing pipeline sand-proof plug valve according to claim 1, characterized in that, The lower end of the plunger (3) is provided with a cross-shaped grease injection channel groove, and a one-way valve (13) is installed at the lower part of the plunger (3).

5. A high-pressure live-line, long-life fracturing pipeline sand-proof plug valve according to claim 4, characterized in that, A valve cover (18) is fixedly provided at the lower end of the valve seat (2). A support pad (30) is provided between the plunger (3) and the valve cover (18). An oil cavity is formed between the support pad (30) and the plunger (3). A grease injection valve (19) is fixedly provided on the valve cover (18). The valve cover (18) is sealed to the valve body (1) through a valve cover seal (12).

6. The ultra-high pressure live switch long-life fracturing pipeline sand-proof plug valve according to claim 1, characterized in that, The valve stem (15) is circumferentially fixed on the inner ring of the bearing (17), the outer ring of the bearing (17) is fixed to the interior of the valve body (1), and a positioning plate (23) and a pressure cap (25) are arranged sequentially from top to bottom between the valve stem (15) and the valve body (1). The positioning plate (23) is fixed on the upper end of the valve body (1) by a set screw (28).

7. A high-life, ultra-high pressure, live-line, fracturing pipeline sand-proof plug valve according to claim 1, characterized in that, The top cover (32) is fixedly mounted on the valve body (1) by positioning screws (33), and the top cover (32) has a through hole (321) corresponding to the shaft (341).

8. A high-pressure live-line, long-life fracturing pipeline sand-proof plug valve according to claim 1, characterized in that, The inner ring (241) is fixedly disposed on the circumferential direction of the valve stem (15) by a clamping washer (26) and a clamping nut (27).

9. A high-pressure live-line, long-life fracturing pipeline sand-proof plug valve according to claim 1, characterized in that, The cross slider (16) is circumferentially fitted with a sealing seat (14). The outer circumferential side of the sealing seat (14) is sealed to the valve body (1) through the sealing seat sealing member (10). The inner circumferential side of the sealing seat (14) is sealed to the valve stem (15) through the valve stem sealing member (11).

10. A high-pressure, high-life, pipeline sand-proof plug valve for fracturing under ultra-high pressure with live switch as described in claim 1, characterized in that, One end of the valve body (1) is connected to a male union (20) and a female union (22), and a retaining ring (21) is provided between the male union (20) and the female union (22). The other end of the valve body (1) is provided with a union seal (29).

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