Intensive light-weight gate valve structure and gate valve

Abstract

The invention provides an intensive light-weight gate valve structure and a gate valve, and belongs to the technical field of oil delivery control equipment.The intensive light-weight gate valve structure comprises a valve body, a valve deck, a valve plate, a valve seat, a valve rod and a tail rod, the valve body comprises a valve plate channel and a fluid channel, and the valve plate channel and the fluid channel are perpendicular to each other and communicate with each other; an upper valve cover and a lower valve cover of the valve cover are used for sealing the top end and the bottom end of the valve plate channel; the interior of the valve plate channel serves as a valve cavity, the cross section of the valve cavity is in a long-strip-hole shape, the valve plate is located in the valve cavity, the valve seat is fixed in the valve body, one end of the valve seat is communicated with the fluid channel, and the other end of the valve seat extends into the valve cavity and is communicated with the valve cavity. A self-tightening valve cover sealing assembly used for sealing is arranged at the joint of the valve body and the valve cover, and a valve seat sealing assembly used for sealing is arranged at the joint of the valve seat and the valve body. Under the condition that the gate valve meets the rated working pressure of 175 MPa and 206 MPa, the overall weight of the gate valve is greatly reduced, and meanwhile on-site safe operation and rapid installation are facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of oil transportation control equipment, and in particular to an intensive lightweight gate valve structure and a gate valve used in an oil transportation pipeline. Background Art

[0002] As an important control device for opening and closing fluid transportation, gate valves are widely used in the industrial field. They are a common type of valve with the advantages of small flow resistance, unrestricted medium flow direction, simple shape, short structure length, good manufacturing processability, and a wide range of applications. The opening and closing parts of the gate valve are gate plates, and the movement direction of the gate plates is perpendicular to the flow direction of the fluid. Therefore, the gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate valve can achieve two-way control and pressure bearing of the fluid on both the upstream and downstream sides of the fluid channel through the combination of the internal valve plate, valve seat and seal. Depending on the usage scenario, the gate valve can be driven manually, hydraulically or electrically.

[0003] Since gate valves can achieve smaller torque and good sealing and pressure-bearing effects based on their principles, they are widely used in the field of oil and gas transportation, especially in oil and gas production stimulation and fracturing, drilling operations, oil testing, oil and gas development and other fields that need to withstand high pressure of fluids. The high pressure-bearing capacity and reliability of use of gate valves have become an important guarantee for the safe operation of oil and gas operations.

[0004] With the increase of drilling depth of oil and gas operations, the pressure of shale oil and gas, tight oil and gas and other operations is getting higher and higher, so higher requirements are also put forward for the pressure bearing performance of gate valves. Traditional 103.5MPa and 140MPa gate valves can no longer meet the existing operation requirements. At present, the pressure bearing capacity of gate valves is required to reach the rated working pressure of 175MPa and 206MPa. CN115750819A discloses a flat gate valve sealing structure for 175MPa ultra-high pressure, which mainly includes a valve body, a first through hole and a second through hole intersecting each other are arranged in the valve body; it also includes a valve core assembly, the valve core assembly includes a valve plate, and a valve seat symmetrically arranged on both sides of the valve plate; the first side of the valve seat is close to the valve body, and the second side is close to the valve plate; it also includes a third side, and the third side is located on the outside of the valve seat in the radial direction; wherein the first side is provided with a first sealing device, and the third side is provided with a third sealing device. This technology mainly improves the sealing effect of the gate valve by adding a first sealing device and a second sealing device to prevent the fluid medium under high pressure from entering the valve cavity, so as to improve the flexibility of valve opening and closing.

[0005] However, although the current high-pressure and ultra-high-pressure valve plates already have a high pressure bearing capacity, in order to ensure that they can be used in high-pressure fluid environments for a long time, the thickness of some parts of the gate valve structure and the weight of the entire gate valve are often limited, making it difficult to meet the demand for lightweight. On the one hand, the larger product weight requires more raw materials, increasing production costs; on the other hand, the excessive weight of the gate valve increases the risk during on-site installation and is not easy to operate. In addition, the heavy weight also places higher requirements on the stability of other structures that support the gate valve, and the number of maintenance times increases accordingly. Summary of the invention

[0006] In view of the above problems, the present invention provides an intensive lightweight gate valve structure and a gate valve, which improves the existing gate valve so that the gate valve can meet the ultra-high pressure bearing capacity of more than 175MPa while reducing the weight of the gate valve itself to meet the lightweight requirements.

[0007] The present invention provides an intensive lightweight gate valve structure, comprising a pressure-bearing component, a pressure-controlling component and a driving component, wherein the pressure-bearing component comprises a valve body and a valve cover, the pressure-controlling component comprises a valve plate and a valve seat, and the driving component comprises a valve stem and a tail stem; The valve body comprises a valve plate channel and a fluid channel, wherein the valve plate channel and the fluid channel are perpendicular to each other and communicated with each other; The valve cover comprises an upper valve cover and a lower valve cover, wherein the upper valve cover is used to close the top end of the valve plate channel, and the lower valve cover is used to close the bottom end of the valve plate channel; The interior of the valve plate channel serves as a valve cavity, the cross section of which is in the shape of an elongated hole, the valve plate is located in the valve cavity, the top end of the valve plate is connected to the valve stem, and the bottom end is connected to the tail rod; the valve seat is fixed in the valve body, one end of the valve seat is connected to the fluid channel, and the other end of the valve seat extends into the valve cavity and is connected to the valve cavity; the fluid channel is closed and opened by the cooperation between the valve plate and the valve seat; A self-tightening valve cover sealing assembly for sealing is provided at the connection between the valve body and the valve cover, and a valve seat sealing assembly for sealing is provided at the connection between the valve seat and the valve body; The tail rod passes downward through the lower valve cover and extends out of the pressure-bearing component.

[0008] As a further improvement of the present invention, the valve cover sealing assembly includes a T-shaped valve cover seal and a valve cover sealing ring cooperating with the valve cover seal, the valve cover seal includes a sealing head and a sealing tail; a first sealing accommodating groove and a second sealing accommodating groove are provided at the connection between the valve body and the valve cover, the first sealing accommodating groove is located between the valve cavity and the second sealing accommodating groove, and the first sealing accommodating groove is connected to the second sealing accommodating groove; the width of the first sealing accommodating groove is greater than the width of the second sealing accommodating groove, the sealing head of the valve cover seal is located in the second sealing accommodating groove, and the sealing tail of the valve cover seal is located in the first sealing accommodating groove, and the valve cover sealing assembly forms an interference seal and a self-tightening seal respectively during the assembly process of the valve body and the valve cover and under the action of the high-pressure fluid in the valve cavity.

[0009] As a further improvement of the present invention, the first accommodating sealing groove and the second accommodating sealing groove form a symmetrical position relationship with the contact surface of the valve body and the valve cover as a reference surface.

[0010] As a further improvement of the present invention, the bottom of the first accommodating sealing groove is a second inclined surface inclined toward the second accommodating sealing groove, and the surface of the sealing tail portion facing the second inclined surface is a first inclined surface in contact with the second inclined surface.

[0011] As a further improvement of the present invention, the inclination angles of the first inclined surface and the second inclined surface are both 15-23°.

[0012] As a further improvement of the present invention, the inclination angle is 15°.

[0013] As a further improvement of the present invention, the valve seat sealing assembly includes an inner sealing ring, an outer sealing ring and a sand protection ring, wherein the inner sealing ring is close to the fluid channel, the outer sealing ring is far away from the fluid channel, and the sand protection ring blocks the gap between the fluid channel and the valve cavity to prevent impurities in the fluid flowing through the fluid channel from entering the valve cavity.

[0014] As a further improvement of the present invention, an identification tube is fixed to the bottom surface of the lower valve cover, an observation window is provided on the side wall of the identification tube, and the portion of the tail rod extending outside the pressure-bearing component is located inside the identification tube.

[0015] As a further improvement of the present invention, a switch position indicating mark is arranged on the outer wall of the identification tube to indicate the opening and closing of the valve plate.

[0016] As a further improvement of the present invention, a grease injection valve for injecting grease into the interior of the pressure-bearing component is provided on the valve cover.

[0017] As a further improvement of the present invention, a discharge valve for discharging impurities in the valve cavity is provided on the valve cover.

[0018] As a further improvement of the present invention, a lifting ring is provided on the valve cover for easy transportation.

[0019] The present invention also provides a gate valve, comprising the above-mentioned intensive lightweight gate valve structure.

[0020] The present invention also provides a petroleum conveying device, comprising the gate valve.

[0021] The present invention provides an intensive lightweight gate valve structure and a gate valve, which improves the cross-section of the valve cavity into a long hole shape, shortens the structural length of the valve seat and the thickness of the valve plate, and reduces the size of the valve cover and the valve body accordingly. A self-tightening valve cover sealing assembly is used to seal the connection between the valve cover and the valve body, thereby reducing the thickness of the valve cover and the number of valve cover bolts used. While meeting the rated working pressure of 175MPa and 206MPa, the overall weight is greatly reduced, the use of raw materials is reduced, and the lightweight design also facilitates safe operation and quick installation on site. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of an intensive lightweight gate valve according to an embodiment of the present invention.

[0023] Figure 2 It is a side view of a compact lightweight gate valve according to an embodiment of the present invention.

[0024] Figure 3 It is a top view of the valve body of the intensive lightweight gate valve according to an embodiment of the present invention.

[0025] Figure 4 It is a schematic diagram of a valve cover sealing assembly of a compact lightweight gate valve according to an embodiment of the present invention.

[0026] Figure 5 It is a schematic diagram of a valve seat sealing assembly of a compact lightweight gate valve according to an embodiment of the present invention.

[0027] Figure 6 It is a test pressure curve diagram of the intensive lightweight gate valve according to the embodiment of the present invention.

[0028] Explanation of the reference numerals: 1. pressure-bearing component; 11. valve body; 111. valve plate channel; 112. fluid channel; 12. valve cover; 121. upper valve cover; 122. lower valve cover; 123. grease injection valve; 124. discharge valve; 125. lifting ring; 126. valve cover bolt; 127. identification tube; 128. observation window; 13. valve chamber; 2. pressure control component; 21. valve plate; 22. valve seat; 3. drive component; 31. valve stem; 32. tail rod; 4. valve cover sealing component; 41. valve cover sealing; 411. sealing head; 412. sealing tail; 413. first inclined surface; 414. first sealing groove; 415. second sealing groove; 416. second inclined surface; 42. valve cover sealing ring; 5. valve seat sealing component; 51. inner sealing ring; 52. outer sealing ring; 53. sand-proof ring. DETAILED DESCRIPTION

[0029] The following is combined with specific embodiments and appendix Figure 1-6 The invention is described in detail so that those skilled in the art can more fully understand the purpose, features and effects of the invention.

[0030] Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as commonly understood by those skilled in the art to which the present invention belongs. When the definition of a term in the present invention conflicts with the meaning commonly understood by those skilled in the art to which the present invention belongs, the definition described in the present invention shall prevail.

[0031] The present invention provides an intensive lightweight gate valve structure and a gate valve, and makes corresponding creative improvements to the structure of the existing gate valve, thereby improving the pressure bearing capacity of the gate valve, reducing the weight of the gate valve, and further optimizing the performance of the gate valve on the basis of lightweight.

[0032] As a specific embodiment of the present invention, this embodiment provides an intensive lightweight gate valve structure, referring to Figure 1 , Figure 2 The intensive lightweight gate valve structure of this embodiment includes a pressure bearing component 1, a pressure control component 2 and a drive component 3.

[0033] The pressure-bearing component 1 includes a valve body 11 and a valve cover 12, which are used to withstand the high pressure of internal fluids such as oil and gas; the pressure-controlling component 2 includes a valve plate 21 and a valve seat 22, wherein the valve plate 21 is a flat plate; the driving component 3 includes a valve stem 31 and a tail rod 32, the valve stem 31 is connected to the driving device, and the valve plate 21 moves under the drive of the valve stem 31, thereby realizing the opening and closing of the gate valve.

[0034] Specifically, in this embodiment, the valve body 11 includes a vertical valve plate channel 111 and a horizontal fluid channel 112. The upper and lower ends of the valve plate channel 111 are open, and the axial ends of the fluid channel 112 are open. The valve plate channel 111 is connected to the fluid channel 112. The valve plate channel 111 forms a valve cavity 13, which is combined with the valve body 112. Figure 3 The valve cavity 13 inside the valve plate channel 111 is in the shape of a long hole that allows the valve plate 21 to move up and down. The valve plate 21 is located in the valve cavity 13 and is arranged vertically. The upper end of the valve plate 21 is connected to the valve stem 31, and the lower end is fixedly connected to the tail rod 32. The valve seat 22 is installed at the connection between the fluid channel 112 and the valve plate channel 111 and fixed on the valve body 11, and the valve plate 21 moves between the two opposite valve seats 22; when in use, the gate valve is opened and closed by the cooperation between the valve plate 21 and the valve seat 22.

[0035] The valve cover 12 includes an upper valve cover 121 and a lower valve cover 122, wherein the upper valve cover 121 is bolted to the valve body 11 to close the upper end opening of the valve plate channel 111 of the valve body 11; the lower valve cover 122 is bolted to the valve body 11 to close the lower end opening of the valve plate channel 111 of the valve body 11. The lower part of the tail rod 32 passes through the lower valve cover 122 and extends to the outside of the valve cavity 13, and the tail rod 32 is slidably connected to the lower valve cover 122. Regardless of whether the valve plate 21 opens or closes the fluid channel 112, the bottom end of the tail rod 32 is always exposed.

[0036] The valve plate 21 is provided with a flow guide hole, which can be located at the upper part of the valve plate 21 or at the lower part of the valve plate 21. In the present embodiment, the flow guide hole is located at the upper part of the valve plate 21. When the valve stem 31 drives the valve plate 21 to move downward to a position, the flow guide hole is connected with the fluid passage 112. At this time, the gate valve is fully opened, allowing fluid to pass through the gate valve, and the tail rod 32 slides downward along the lower valve cover 122, and more of the tail rod 32 extends out of the valve cover 12; when the valve stem 31 drives the valve plate 21 to move upward to a position, the valve plate 21 completely closes the fluid passage 112. At this time, the gate valve is fully closed, and fluid is not allowed to pass through the gate valve. The tail rod 32 also moves upward with the valve plate 21, and the part of the tail rod 32 exposed outside the valve cover 12 is reduced.

[0037] On the one hand, the existence of the tail rod 32 can guide the valve plate 21. During the rise and fall of the valve plate 21, due to the guidance of the tail rod 32, the valve plate 21 always maintains a perpendicular state to the fluid channel 112 (fluid flow direction) during movement, avoiding the valve plate 21 from deflecting and causing excessive friction with the valve seat 22 on one side, thereby causing the loss of the valve plate 21 and the valve seat 22, and extending the service life of the valve plate 21 and the valve seat 22; on the other hand, since the tail end of the tail rod 32 is always located outside the valve cover 12, the opening and closing state of the gate valve can be judged by observing the extension of the tail rod 32. For the gate valve structure in this embodiment, since the gate valve has only two states, fully open and fully closed, when the tail rod 32 extends for a long time, it can be judged that the gate valve is in a fully open state, and when the tail rod 32 extends for a short time, it can be judged that the gate valve is in a fully closed state.

[0038] Furthermore, in order to better observe the opening and closing state of the gate valve, an identification tube 127 coaxial with the lower valve cover 122 is fixed at the bottom of the lower valve cover 122, the lower end of the identification tube 127 is open, and the bottom end of the tail rod 32 is located in the identification tube 127. The wall of the identification tube 127 is provided with a long strip observation window 128 extending along the length direction of the identification tube 127, and at least four observation windows 128 are arranged on the identification tube 127 at equal distances along the circumference of the identification tube 127, so as to facilitate the side observation of the position of the bottom end of the tail rod 32 located in the identification tube 127. The identification tube 127 can protect the tail rod 32, prevent the external force from colliding with the tail rod 32, and cause the sealing effect between the tail rod 32 and the lower valve cover 122 to be weakened, thereby ensuring the pressure-bearing performance of the gate valve.

[0039] Preferably, a switch position indicator mark is provided on the outer wall of the identification tube 127, and the fully open or fully closed state of the gate valve is indicated by the position reached by the tail rod 32. For example, in a feasible embodiment, the position corresponding to the bottom end of the tail rod 32 when the gate valve is fully open is marked with "open" or "OPEN" on the outer wall of the identification tube 127, and the position corresponding to the bottom end of the tail rod 32 when the gate valve is fully closed is marked with "close" or "CLOSE" on the outer wall of the identification tube 127. It is then possible to directly determine whether the gate valve is in a fully open or fully closed state by the mark corresponding to the bottom end of the tail rod 32. If the bottom end of the tail rod 32 is between the marks of "open" and "close", it indicates that it has not yet been fully opened or closed and needs to continue the operation.

[0040] In this embodiment, the identification tube 127 is arranged at the bottom end of the lower valve cover 122 and a switch position indication mark is added on the outer wall of the identification tube 127. On the one hand, the tail rod 32 is protected, and on the other hand, the opening and closing state of the gate valve can be clearly understood through the switch position indication mark corresponding to the moving position of the tail rod 32.

[0041] In this embodiment, the cross section (horizontal cross section) of the valve cavity 13 inside the valve plate channel 111 is in the shape of an elongated hole (long waist-shaped hole), and the length direction of the elongated hole in the cross section of the valve cavity 13 is perpendicular to the fluid channel 112, which plays an important role in the lightweight design of the gate valve structure. Since the valve plate 21 is a flat plate structure, the corresponding surfaces of the valve seats 22 on both sides that are in contact with the valve plate 21 are also flat. For a conventional circular hole valve cavity 13, the distance between the position where the valve seat 22 is installed in the fluid channel 112 and the valve plate 21 is relatively long, resulting in a required length of the valve seat 22 being relatively large (the portion of the valve seat 22 extending into the circular hole and into the fluid channel 112 is increased to meet the arc surface); the valve cavity 13 in this embodiment is in the shape of an elongated hole, and the contact surface between the fluid channel 112 and the valve cavity 13 is a plane, and the valve seat 22 can better adapt to the valve plate 21 and only needs to extend a short distance into the elongated valve cavity 13. In fact, as long as the valve seat 22 slightly exceeds the side of the elongated hole, the valve seat 22 is flatter, thereby shortening the structural length of the valve seat 22 and reducing the weight of the valve seat 22. At the same time, the sizes of the valve body 11 and the valve cover 12 are also reduced accordingly, thereby reducing the weight of the gate valve.

[0042] In addition, since the long hole-shaped valve cavity 13 is adopted, the thickness of the valve plate 21 is also reduced to match the valve cavity 13, thereby reducing the weight of the valve plate 21 and further reducing the total weight of the gate valve, thereby achieving lightweight gate valve.

[0043] Through the improvement of this embodiment, the valve plate 21 and the valve seat 22 can be designed to be thinner, thereby reducing the weight of the gate valve and reducing the difficulty of installation.

[0044] Further, refer to Figure 4 A valve cover sealing assembly 4 is provided at the connection between the valve cover 12 and the valve body 11 . The valve cover sealing assembly 4 is close to the valve cavity 13 .

[0045] Specifically, the valve cover sealing assembly 4 includes a valve cover seal 41 and a valve cover sealing ring 42, wherein the valve cover seal 41 is T-shaped, including a sealing head 411 and a sealing tail 412 perpendicular to each other. The connection between the valve cover 12 and the valve body 11 is sequentially provided with a first accommodating sealing groove 414 close to the valve cavity 13 and a second accommodating sealing groove 415 located on the side of the first accommodating sealing groove 414 away from the valve cavity 13, and the first accommodating sealing groove 414 is connected to the second accommodating sealing groove 415. The width of the first accommodating sealing groove 414 is greater than the width of the second accommodating sealing groove 415. The contact surface between the valve cover 12 and the valve body 11 is used as a reference surface, and the first accommodating sealing groove 414 and the second accommodating sealing groove 415 form a symmetrical position relationship with respect to the reference surface.

[0046] The sealing head portion 411 of the valve cover sealing member 41 is inserted into the second accommodating sealing groove 415 , and the sealing tail portion 412 of the valve cover sealing member 41 is located in the first accommodating sealing groove 414 .

[0047] The bottom of the first accommodating sealing groove 414 is a second inclined surface 416 inclined toward the second accommodating sealing groove 415, and the second inclined surface 416 is a sealing surface. The surface of the sealing tail 412 facing the second inclined surface 416 is the first inclined surface 413. The first inclined surface 413 is adapted and fitted with the second inclined surface 416. Under the action of the high-pressure fluid in the valve chamber 13, the sealing tail 412 tends to move along the second inclined surface 416 toward the second accommodating sealing groove 415.

[0048] Furthermore, the valve cover sealing ring 42 is located in the first accommodating sealing groove 414 and the second accommodating sealing groove 415 and is located below the valve cover seal 41 , wherein one end of the valve cover sealing ring 42 extends into the bottom of the second accommodating sealing groove 415 and is squeezed by the sealing head 411 .

[0049] During assembly, when the valve cover 12 is assembled with the valve body 11 by using the valve cover bolts 126, the valve cover 12 and the valve body 11 will squeeze the sealing head 411 of the valve cover seal 41, which is in an interference seal state, forming a primary seal; during use, when the high-pressure fluid enters the valve cavity 13, the high-pressure fluid will laterally squeeze the sealing tail 412 of the valve cover seal 41 so that the sealing tail 412 is tightly attached to the second inclined surface 416, which is in a self-tightening seal state, forming a secondary seal. The greater the pressure, the greater the pressure on the sealing tail 412, and the better the sealing effect, so that the connection between the valve body 11 and the valve cover 12 has excellent sealing performance, thereby ensuring the safe operation of the gate valve. The valve cover sealing ring 42 is squeezed in both the primary seal and the secondary seal, thereby playing an effective sealing role.

[0050] Furthermore, the inclination angles of the first inclined surface 413 and the second inclined surface 416 are both 15-23° (based on the vertical direction), such as 18°, 20°, etc. Preferably, the inclination angle is 15°. Setting the inclination angle to 15° shortens the lateral distance of the valve cover seal 41, can make the structure more compact, and make it easier for the sealing tail 412 to fit onto the second inclined surface 416 to form a high-pressure seal, with a better sealing effect. If it is less than 15°, the material requirements will be higher. Therefore, in this embodiment, considering the sealing effect and material properties, 15° is selected as the inclination angle of the first inclined surface 413 and the second inclined surface 416.

[0051] The valve body 11 and the valve cover 12 of this embodiment form a self-tightening seal through the valve cover sealing assembly 4. Compared with the prior art that relies on bolts to provide pre-tightening force to achieve sealing between the valve body 11 and the valve cover 12, the sealing structure of this embodiment reduces the sealing force while ensuring the sealing effect, effectively reduces the average sealing diameter, and can reduce the pressure of the valve cover 12 and the load-bearing requirements of the valve cover bolts 126. Since the valve cover seal 41 adopts a design of reducing the cross-sectional area, and relies on the internal pressure to make the sealing tail 412 of the valve cover seal 41 close to the valve body 11 and the valve cover 12, it can not only reduce the force applied to the valve cover bolts 126, but also does not require too much pre-tightening force to maintain the tightening state. Therefore, the specifications and quantity of the valve cover bolts 126 become smaller, which can reduce the thickness of the valve cover 12 and the use of the valve cover bolts 126 or specifications and even the size of the valve body 11, thereby reducing the weight of the entire gate valve and further improving the lightweight performance of the gate valve.

[0052] Further, refer to Figure 5 A valve seat sealing assembly 5 is provided between the valve body 11 and the valve seat 22. The valve seat sealing assembly 5 comprises an inner sealing ring 51, an outer sealing ring 52 and a sand prevention ring 53.

[0053] Specifically, the valve body 11 is provided with an installation groove for installing the valve seat 22, and the inner sealing ring 51 and the outer sealing ring 52 are arranged at intervals on the end surface of the valve seat 22 facing the groove bottom of the installation groove. Among them, the inner sealing ring 51 is close to the fluid channel 112, and the outer sealing ring 52 is far away from the fluid channel 112. The sealing effect between the valve body 11 and the valve seat 22 is improved by double-layer sealing. In general, sand prevention is carried out by reducing the floating gap, but as the particle size of fracturing sand continues to decrease, such as the diameter of fracturing sand in some areas is 200 mesh, or even reaches a smaller 300 mesh, the sand prevention effect of reducing the floating gap is not good. The inner sealing ring 51 in this embodiment can be used to prevent impurities from entering the valve cavity 13, and the outer sealing ring 52 can be used for effective sealing of the pressure of the valve cavity 13 to avoid fluid leakage. It should be noted that the valve seat 22 is provided with a sealing groove for placing the inner sealing ring 51 and the outer sealing ring 52.

[0054] Furthermore, in order to improve the sand prevention effect, the sand prevention ring 53 is added on the basis of the inner sealing ring 51. The sand prevention ring 53 is located between the bottom and the wall of the installation groove of the valve seat 22 and the valve body 11. The sand prevention ring 53 forms a communication barrier between the fluid channel 112 and the valve cavity 13, preventing impurities in the transported fluid from entering the valve cavity 13.

[0055] The sand control ring 53 can be made of metal material or non-metal material.

[0056] Further, refer to Figure 2 A grease injection valve 123 is provided on the valve cover 12. The grease injection valve 123 is provided on both the upper valve cover 121 and the lower valve cover 122. The grease injection valve 123 is used to inject grease into the interior of the gate valve, thereby increasing the service life of the gate valve.

[0057] Furthermore, a discharge valve 124 is provided on the valve cover 12, and the discharge valve is provided on both the upper valve cover 121 and the lower valve cover 122. Impurities entering the valve cavity 13 during operation can be discharged through the discharge valve 124 to ensure normal use of the gate valve.

[0058] Furthermore, a lifting ring 125 is fixed on the upper valve cover 121. In this embodiment, there are two lifting rings 125, and the two lifting rings 125 are symmetrically arranged on the upper valve cover 121. By providing the lifting ring 125, it is convenient to transport the gate valve on site and to operate the gate valve.

[0059] Furthermore, the valve cover bolt 126 is an integrated structure, with the stud and the nut being integrated. A threaded blind hole matching the valve cover bolt 126 is provided on the upper surface of the valve body 11, and a through hole opposite to the threaded blind hole is provided on the valve cover 12. During assembly, the valve cover bolt 126 is installed by passing the valve cover bolt 126 through the through hole on the valve cover 12 and tightening it in the threaded blind hole. This arrangement can reduce the damage to the thread compared to the traditional stud and nut separate combination. Preferably, the head (nut) of the valve cover bolt 126 is an external hexagon and / or an internal four-corner, so as to facilitate the loading and unloading of the valve cover bolt 126, such as using a ratchet wrench for quick installation.

[0060] In the intensive lightweight gate valve structure of this embodiment, the weight of the valve seat, valve plate, valve cover and valve cover bolts are all reduced, thereby greatly reducing the weight of the entire gate valve and reducing the use of raw materials.

[0061] This embodiment has overcome the current technical prejudice by making creative improvements to the existing gate valve structure, which can significantly reduce the weight of the gate valve and achieve unexpected technical effects. According to tests, it can still withstand a rated pressure of more than 175MPa or even 206MPa while reducing the weight by 30% compared with the existing gate valve structure. By reducing the weight of the gate valve, on-site installation is lighter and easier to operate. In addition, the gate valve structure of this embodiment can meet the requirements of large diameters, and the diameter size of the fluid channel 112 can reach 7-1 / 16″ (180mm) or even 9″ (230mm).

[0062] The present invention also provides a gate valve, which includes the above-mentioned intensive lightweight gate valve structure. The gate valve using the above-mentioned intensive lightweight gate valve structure is subjected to a hydrostatic pressure test, and the test pressure curve obtained is as follows: Figure 6 The test temperature is 25℃ and the test is based on the internal product test outline (JREQT064764).

[0063] The test was conducted in two stages. In the first stage, the pressure was stabilized at 261.30MPa test pressure for 3 minutes, the allowable pressure drop was 3.45MPa, the actual pressure drop was 1.05MPa, no leakage was found, and the test result was qualified; in the second stage, the pressure was stabilized at 261.35MPa test pressure for 15 minutes, the allowable pressure drop was 3.45MPa, the actual pressure drop was 2.84MPa, no leakage was found, and the test result was qualified.

[0064] The tests in both phases show that the gate valve of this embodiment has ultra-high pressure bearing capacity and good sealing performance. According to the test, the gate valve of this embodiment can achieve rated working pressures of 175MPa and 206MPa, and the sealing performance can achieve a hydrostatic pressure test capability of 1.5 times the rated working pressure.

[0065] The gate valve of this embodiment is particularly suitable for fracturing operation conditions containing fracturing proppants and conditions requiring a large drift diameter.

[0066] The present invention also provides a petroleum delivery device, comprising the gate valve, through which the delivery control of high-pressure and ultra-high-pressure fluids is realized.

[0067] The above description is only a preferred embodiment of the present invention and does not constitute any other form of limitation to the present invention. Any modification or equivalent change made based on the technical essence of the present invention still falls within the scope of protection required by the present invention.

Claims

1. A compact lightweight gate valve structure, comprising a pressure-bearing component (1), a pressure-controlling component (2) and a driving component (3), wherein the pressure-bearing component (1) comprises a valve body (11) and a valve cover (12), the pressure-controlling component (2) comprises a valve plate (21) and a valve seat (22), and the driving component (3) comprises a valve stem (31) and a tail stem (32), characterized in that: The valve body (11) comprises a valve plate channel (111) and a fluid channel (112), wherein the valve plate channel (111) and the fluid channel (112) are perpendicular to each other and communicate with each other; The valve cover (12) comprises an upper valve cover (121) and a lower valve cover (122), wherein the upper valve cover (121) is used to close the top end of the valve plate channel (111), and the lower valve cover (122) is used to close the bottom end of the valve plate channel (111); The interior of the valve plate channel (111) serves as a valve cavity (13), the cross section of the valve cavity (13) is in the shape of an elongated hole, the valve plate (21) is located in the valve cavity (13), the top end of the valve plate (21) is connected to the valve stem (31), and the bottom end is connected to the tail stem (32); the valve seat (22) is fixed in the valve body (11), one end of the valve seat (22) is connected to the fluid channel (112), and the other end of the valve seat (22) extends into the valve cavity (13) and is connected to the valve cavity (13); the fluid channel (112) is closed and opened by the cooperation between the valve plate (21) and the valve seat (22); A self-tightening valve cover sealing assembly (4) for sealing is provided at the connection between the valve body (11) and the valve cover (12), and a valve seat sealing assembly (5) for sealing is provided at the connection between the valve seat (22) and the valve body (11); The tail rod (32) passes downward through the lower valve cover (122) and extends to the outside of the pressure-bearing component (1).

2. The intensive lightweight gate valve structure according to claim 1 is characterized in that: The valve cover sealing assembly (4) comprises a T-shaped valve cover sealing member (41) and a valve cover sealing ring (42) matched with the valve cover sealing member (41); the valve cover sealing member (41) comprises a sealing head portion (411) and a sealing tail portion (412); a first accommodating sealing groove (414) and a second accommodating sealing groove (415) are provided at the connection between the valve body (11) and the valve cover (12); the first accommodating sealing groove (414) is located between the valve cavity (13) and the second accommodating sealing groove (415), and the first accommodating sealing groove (414) and the second accommodating sealing groove (415) are connected to each other. The sealing grooves (415) are connected; the width of the first accommodating sealing groove (414) is greater than the width of the second accommodating sealing groove (415); the sealing head (411) of the valve cover sealing member (41) is located in the second accommodating sealing groove (415); the sealing tail (412) of the valve cover sealing member (41) is located in the first accommodating sealing groove (414); the valve cover sealing assembly (4) forms an interference seal and a self-tightening seal respectively during the assembly process of the valve body (11) and the valve cover (12) and under the action of the high-pressure fluid in the valve cavity (13).

3. The intensive lightweight gate valve structure according to claim 2 is characterized in that: The first accommodating sealing groove (414) and the second accommodating sealing groove (415) form a symmetrical positional relationship with the contact surfaces of the valve body (11) and the valve cover (12) as reference surfaces.

4. The intensive lightweight gate valve structure according to claim 2, characterized in that: The bottom of the first accommodating sealing groove (414) is a second inclined surface (416) inclined toward the second accommodating sealing groove (415), and the surface of the sealing tail (412) facing the second inclined surface (416) is a first inclined surface (413) in contact with the second inclined surface (416).

5. The intensive lightweight gate valve structure according to claim 4 is characterized in that: The inclination angles of the first inclined surface (413) and the second inclined surface (416) are both 15-23°.

6. The intensive lightweight gate valve structure according to claim 1, characterized in that: The valve seat sealing assembly (5) comprises an inner sealing ring (51), an outer sealing ring (52) and a sand-proof ring (53), wherein the inner sealing ring (51) is close to the fluid channel (112), the outer sealing ring (52) is far away from the fluid channel (112), and the sand-proof ring (53) blocks the gap between the fluid channel (112) and the valve cavity (13) to prevent impurities in the fluid flowing through the fluid channel (112) from entering the valve cavity (13).

7. The intensive lightweight gate valve structure according to claim 1, characterized in that: An identification tube (127) is fixed to the bottom surface of the lower valve cover (122), an observation window (128) is provided on the side wall of the identification tube (127), and a portion of the tail rod (32) extending outside the pressure-bearing component (1) is located inside the identification tube (127).

8. The intensive lightweight gate valve structure according to claim 7, characterized in that: A switch position indication mark is provided on the outer wall of the identification tube (127) for indicating whether the valve plate (21) is open or closed.

9. The compact lightweight gate valve structure according to claim 1, characterized in that: The valve cover (12) is provided with a grease injection valve (123) for injecting grease into the interior of the pressure-bearing component (1).

10. The compact lightweight gate valve structure according to claim 1, characterized in that: The valve cover (12) is provided with a discharge valve (124) for discharging impurities in the valve chamber (13).

11. The compact lightweight gate valve structure according to claim 1, characterized in that: The valve cover (12) is provided with a lifting ring (125) for easy transportation.

12. A gate valve, characterized in that: It comprises the compact lightweight gate valve structure as described in any one of claims 1 to 11.

13. A petroleum delivery device, characterized in that: Including the gate valve as claimed in claim 12.

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