A rising stem high pressure hard seal globe valve

Abstract

The utility model discloses a kind of lifting rod type high-pressure hard sealing stop valve, it is related to oil and gas exploration tool technical field, including valve body, sealing assembly is installed between valve body and valve cover;The utility model is matched through pressing plate, gland, graphite packing and the second Lipseal sealing ring support, guarantee the sealing property of oil and gas on-off, graphite packing fills the clearance between valve stem and valve cover, the outer wall of valve stem is tightly adhered by the second Lipseal sealing ring's multiple lips teeth, and pressing plate can be slightly adjusted tightness, adaptive pressure fluctuation;By the cooperation between first Lipseal sealing ring and sealing ring, constitute "pressure self-sealing effect", so that the higher the chamber pressure of intercommunication chamber, the stronger the extrusion of valve body and valve cover connecting surface, and the greater the specific pressure of sealing;In addition, the gasket in valve clack buffer groove can offset the pressure impact of valve stem to valve clack, prevent connection part leakage, avoid resource waste, equipment damage and security risk caused by medium leakage.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas exploration equipment technology, and in particular to a lifting rod type high-pressure hard-seal shut-off valve. Background Technology

[0002] As global oil and gas exploration and development expands to deeper, deeper seas and complex geological environments, the market demand for high-pressure and high-reliability valves continues to grow. Wellhead equipment and Christmas trees are core equipment for oil and gas extraction, and their working environment is extremely complex and harsh, which constantly raises the performance requirements for valves. In particular, in the development of ultra-deep wells and acidic oil and gas fields, conventional valves are difficult to meet the dual challenges of ultra-high pressure and corrosive media. Currently, there is still a technological gap in the field of API6A10000PSI ultra-high pressure gate valves in China, and a large number of high-end products rely on imports. Our company's API6A10000PSI rising stem high-pressure hard-seal gate valve is designed to fill this market gap and meet the urgent needs of the oil and gas industry for ultra-high pressure valves. The successful implementation of this project will effectively expand the company's business scope, enhance its competitiveness in the high-end valve market, and further increase the company's visibility and brand value. Therefore, it is necessary to improve and address the above-mentioned issues. Utility Model Content

[0003] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a lifting rod type high-pressure hard-seal shut-off valve.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a lifting rod type high-pressure hard-seal shut-off valve, comprising a valve body, a valve cover installed on the top surface of the valve body, support rods vertically installed on both sides of the top surface of the valve cover, a positioning plate fixedly connected to the top surface of the support rods, and a guide block slidably connected between the support rods, a limit hole being opened in the middle of the top surface of the guide block, a gearbox being installed on the top surface of the positioning plate, and a sealing assembly being installed between the valve body and the valve cover.

[0005] Preferably, the valve body has an inlet port and an outlet port on both sides, and the valve body and the valve cover form a communicating chamber. The communicating chamber is connected to the inlet port and the outlet port. The valve cover has a threaded hole with a matching limiting hole in the middle of its top surface. The threaded hole is connected to the communicating chamber. The valve cover is threadedly connected to a valve stem with matching limiting hole and threaded hole. The top surface of the valve stem is connected to a gearbox. A handwheel is connected to the other end of the gearbox.

[0006] Preferably, the sealing assembly includes a valve disc mounted on the valve stem and fitting against the inner cavity of the communicating chamber. The valve disc is divided into an upper connecting end and a lower sealing end, and the sealing end of the valve disc fits against the inner wall of the feed port. The valve disc has a conical cross-section, and an installation groove is provided in the middle of the top surface of the valve disc. A buffer groove is provided in the middle of the bottom surface of the installation groove.

[0007] Preferably, a pad is installed in the buffer groove, a locking nut is threaded below the valve stem, the inner end of the locking nut abuts against the top surface of the valve disc and the outer side is threaded to the mounting groove, and the bottom surface of the valve stem abuts against the pad. A first sealing groove and a second sealing groove are respectively opened at the connection between the valve body and the valve cover, and a first Lipseal sealing ring and a sealing ring are respectively installed in the first sealing groove and the second sealing groove.

[0008] Preferably, a pressure plate is sleeved on the top of the valve stem, the bottom surface of the pressure plate is placed between two support rods, and the bottom surface of the pressure plate abuts against the top surface of the valve cover. A third sealing groove for cooperating with the valve stem is opened on the top surface of the valve cover.

[0009] Preferably, the pressure plate is fitted with a pressure cap that matches the third sealing groove from top to bottom, a graphite packing is installed on the bottom surface of the pressure cap, and a second Lipseal sealing ring is installed between the bottom surface of the graphite packing and the bottom surface of the third sealing groove.

[0010] Compared with the prior art, the beneficial effects of this utility model are: This invention, through the cooperation of the support and guide components and the transmission components, and through the cooperation of the pressure plate, pressure cap, graphite packing, and second Lipseal sealing ring bracket, ensures the sealing performance of oil and gas flow. The graphite packing fills the gap between the valve stem and the valve cover, and the multiple lips of the second Lipseal sealing ring tightly fit the outer wall of the valve stem. The pressure plate can be finely adjusted to adapt to pressure fluctuations. The cooperation between the first Lipseal sealing ring and the sealing ring forms a "pressure self-sealing effect," which means that the higher the pressure in the connected chamber, the stronger the compression on the connection surface between the valve body and the valve cover, and the greater the sealing specific pressure. In addition, the pad in the valve disc buffer groove can offset the pressure impact of the valve stem on the valve disc, prevent leakage at the connection point, and avoid resource waste, equipment damage, and safety hazards caused by media leakage. Attached Figure Description

[0011] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings: Figure 1 This is a half-sectional schematic diagram of the overall structure proposed in this utility model; Figure 2This is a schematic diagram of the cross-section of the guide block proposed in this utility model; Figure 3 The present utility model proposes Figure 1 Enlarged diagram of part A in the middle; Figure 4 The present utility model proposes Figure 1 Enlarged diagram of section B; Figure 5 The present utility model proposes Figure 1 Enlarged diagram of section C; Figure 6 The present utility model proposes Figure 1 Enlarged schematic diagram of part D in the middle.

[0012] The numbers in the diagram are: 1. Valve body; 2. Valve cover; 3. Valve stem; 4. Support rod; 5. Positioning plate; 6. Guide block; 7. Gearbox; 8. Handwheel; 9. Connecting chamber; 10. Valve disc; 11. Gasket; 12. Locking nut; 13. First Lipseal sealing ring; 14. Sealing ring; 15. Pressure plate; 16. Pressure cap; 17. Graphite packing; 18. Second Lipseal sealing ring. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0014] Example: See Figures 1 to 6This utility model discloses a lifting rod type high-pressure hard-seal shut-off valve, comprising a valve body 1, a valve cover 2 and a subsequent first Lipseal sealing ring 13 and sealing ring 14 connected by external bolts and threads, and connected to the upper and lower ends of an external oil and gas transmission pipeline by external bolts and flanges for the inlet and outlet ports respectively. The valve body 1 is made of forged steel and can withstand high pressure, high pressure differential and external load. The valve cover 2 is installed on the top surface of the valve body 1, which facilitates the installation and fixing of support rods 4 by external welding process and helps the valve body 1 form a sealing structure. The valve cover 2 is also made of forged steel. Support rods 4 are vertically installed on both sides of the top surface of the valve cover 2, which facilitate the installation and positioning of positioning plates 5 by external bolts and auxiliary components, and limit the positioning plates 5. The positioning plates 5 are fixed to the top surface of the support rods 4, which facilitate the positioning of the subsequent valve rod 3 by guide blocks 6. Guide blocks 6 are slidably connected between the support rods 4, and limit holes are opened in the middle of the top surface of the guide blocks 6. Block 6 facilitates the sliding connection of valve stem 3 and limits the valve stem 3; a gearbox 7 is installed on the top surface of positioning plate 5, which facilitates the connection of handwheel 8 through external components and drives valve stem 3 to rotate in conjunction with handwheel 8 and its internal components; a sealing component is installed between valve body 1 and valve cover 2, and inlet and outlet ports are respectively opened on both sides of valve body 1, and a communicating chamber 9 is formed between valve body 1 and valve cover 2, which communicates with inlet and outlet ports; a matching limiting hole is opened in the middle of the top surface of valve cover 2. The threaded hole is connected to the connecting chamber 9, which facilitates the opening and closing of the feed port and the discharge port, allowing the medium from the external oil and gas transport pipeline to reach the down pipe from the up pipe. The valve cover 2 is threadedly connected to the valve stem 3, which is fitted with the limiting hole and the threaded hole. The top surface of the valve stem 3 is connected to the gearbox 7, which facilitates the locking nut 12 to drive the valve disc 10 to move up and down within the connecting chamber 9. The other end of the gearbox 7 is connected to a handwheel 8, which facilitates the driving of the gearbox 7 and thus the valve stem 3 to rotate and move up and down.

[0015] In this invention, the sealing assembly includes a valve disc 10 installed on the valve stem 3 and fitted into the inner cavity of the communicating chamber 9. The valve disc 10 is divided into an upper connecting end and a lower sealing end, and the sealing end of the valve disc 10 is fitted into the inner wall of the feed port. The cross-section of the valve disc 10 is conical, and an installation groove is provided in the middle of the top surface of the valve disc 10. A buffer groove is provided in the middle of the bottom surface of the installation groove. The valve disc 10 facilitates the activation and deactivation of the feed end and discharge end in the valve body 1, and facilitates the subsequent threaded connection and tightening of the locking nut 12. The buffer groove... An internal pad 11 is installed to buffer the pressure impact of the valve stem 3 on the valve disc 10. A locking nut 12 is threaded below the valve stem 3. The inner end of the locking nut 12 abuts against the top surface of the valve disc 10, and the outer side is threaded into the mounting groove. The bottom surface of the valve stem 3 abuts against the pad 11. A first sealing groove and a second sealing groove are respectively provided at the connection between the valve body 1 and the valve cover 2. A first Lipseal sealing ring 13 and a sealing ring 14 are respectively installed in the first and second sealing grooves. The Lipseal sealing ring 13 and sealing ring 14 facilitate the sealing effect between the valve body 1 and the valve cover 2. A pressure plate 15 is sleeved on the top of the valve stem 3. The bottom surface of the pressure plate 15 is placed between the two support rods 4, and the bottom surface of the pressure plate 15 abuts against the top surface of the valve cover 2. The top surface of the valve cover 2 has a third sealing groove that matches the valve stem 3. The pressure plate 15 facilitates the application of stable pressure to the graphite packing 17 and the second Lipseal sealing ring 18 by the pressure cap 16. The pressure plate 15 is installed from top to bottom with the pressure cap 16 that matches the third sealing groove. The bottom surface of the pressure cap 16 is installed with the graphite packing 17. The second Lipseal sealing ring 18 is installed between the bottom surface of the graphite packing 17 and the bottom surface of the third sealing groove. The pressure plate 15, the second Lipseal sealing ring 18, the graphite packing 17 and the pressure cap 16 facilitate the sealing of the connection between the valve stem 3 and the valve cover 2. The sealing materials of the first Lipseal sealing ring 13 and the second Lipseal sealing ring 18 are PTFE+ELGILOY.

[0016] Working Principle: When using this utility model, the operator needs to check the connection between the valve and external components to ensure the stable operation of the valve under high pressure. First, the operator needs to visually inspect whether the connection between the inlet and outlet ports on both sides of the valve body 1 and the flanges and threads of the external oil and gas transmission pipeline is tight and without looseness to prevent leakage of the medium from the port connection. Second, the operator also needs to check whether the first Lipseal sealing ring 13 and sealing ring 14 installed in the first and second sealing grooves between the valve body 1 and the valve cover 2 are intact. At the same time, the operator uses an external torque wrench to turn the external bolts connecting the valve body 1 and the valve cover 2 to ensure that the torque meets the standard. Then, the operator should turn the handwheel 8 to listen for any abnormal transmission noise in the gearbox 7 and observe whether the connection between the handwheel 8 and the gearbox 7 is tight. At the same time, the operator should observe whether the guide block 6 slides smoothly between the support rod 4 (the guide block 6 is used for vertical guidance of the subsequent movement of the valve rod 3). After the operator has completed the inspection, the operator can issue an on / off command through the central control panel to start the oil and gas transmission pipeline. The operator turns the handwheel 8, which drives the gearbox 7 to rotate. The gearbox 7 converts the rotational motion into the vertical upward motion of the valve stem 3. At this time, the valve stem 3 will drive the guide block 6 to slide along the support rod 4 (the guide block 6 cooperates with the valve stem 3 through the limiting hole to ensure that the valve stem 3 always moves vertically and avoids deviation). The valve disc 10 will also rise synchronously with the valve stem 3, connecting the inlet port and outlet port in the inner cavity of the valve body 1 to allow oil and gas to pass through (during the rise of the valve stem 3, the second Lipseal sealing ring 18, graphite packing 17 and pressure plate 16 between the valve stem 3 and the valve cover 2 will continue to function, and the pressure plate 1) 5. The gland 16 applies stable pressure to the graphite packing 17 and the second Lipseal seal 18, and the multiple lips of the second Lipseal seal 18 fit tightly against the outer wall of the valve stem 3, while the graphite packing 17 fills the gaps, forming a seal on the valve stem 3 (we refer to the part composed of the gland 15, the second Lipseal seal 18, the graphite packing 17, and the gland 16 as the first sealing system); simultaneously, the first Lipseal seal 13 and the sealing ring 14 between the valve body 1 and the valve cover 2 remain in contact, preventing the medium from leaking from the connection surface between the valve body 1 and the valve cover 2. As valve disc 10 rises, its conical sealing end gradually detaches from the inner wall of the inlet port. The oil / gas medium enters the communicating chamber 9 formed by valve body 1 and valve cover 2 from the inlet port, and is then transported to the downstream pipeline via the outlet port. At this time, valve disc 10 remains in contact with the inner cavity of communicating chamber 9, and the sealing ring 12 below valve stem 3 engages with the mounting groove of valve disc 10. This, combined with the pad 11 in the buffer groove, buffers the pressure impact of valve stem 3 on valve disc 10, ensuring no medium leakage at the connection between valve stem 3 and valve disc 10. During stable medium transport, the pressure inside valve body 1 continuously acts on the first lipse of the connection surface between valve body 1 and valve cover 2. The sealing ring 13 and sealing ring 14 (which we call the second sealing system) trigger the "pressure self-sealing effect": the higher the chamber pressure, the stronger the squeezing force on the second sealing system composed of valve body 1 and valve cover 2, and the sealing specific pressure increases accordingly, further improving the sealing reliability of valve stem 3; at the same time, the first sealing system installed on valve stem 3 will play a role. The graphite packing 17 can be finely adjusted on-site through pressure plate 15 and external bolts. The lip and tooth structure of the first Lipseal sealing ring 13, together with the built-in alloy spring, effectively resists the deformation of the sealing element caused by pressure fluctuations, ensuring stable sealing performance under high pressure conditions; When valve stem 3 is at risk of wear or breakage, it can be replaced according to the following procedure: First, the operator closes the upstream pipeline valve and disconnects the inlet and outlet ports of valve body 1 from the external pipeline to ensure that there is no risk of media leakage during the replacement process. Then, disassemble the handwheel 8 and gearbox 7 in sequence. Next, loosen the support rod 4 and positioning plate 5, remove the positioning plate 5 and guide block 6 to expose the top of valve stem 3. Then, remove the pressure plate 15 and pressure cap 16, and then remove the second Lipseal sealing ring 18 in sequence. The graphite packing 17 releases the restriction on the valve stem 3. After the restriction between the valve stem 3 and the locking nut 12 is released by rotating it with an external tool, the old valve stem 3 is pulled upward (the lower part of the valve stem 3 is separated from the pad 11 of the valve disc 10, so that the valve disc 10 is temporarily left in the communicating chamber 9). The new valve stem 3 is passed through the threaded hole in the valve cover 2 so that the lower end of the new valve stem 3 abuts against the pad 11 in the buffer groove of the valve disc 10, ensuring that the valve stem 3 is vertical and without deviation. Then, the replacement can be completed by following the disassembly steps in sequence.

[0017] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A rising rod type high-pressure hard-seal shut-off valve, comprising a valve body (1), characterized in that: A valve cover (2) is installed on the top surface of the valve body (1). Support rods (4) are vertically installed on both sides of the top surface of the valve cover (2). A positioning plate (5) is fixedly connected to the top surface of the support rods (4). A guide block (6) is slidably connected between the support rods (4). A limit hole is opened in the middle of the top surface of the guide block (6). A gearbox (7) is installed on the top surface of the positioning plate (5). A sealing assembly is installed between the valve body (1) and the valve cover (2).

2. The lifting rod type high-pressure hard-seal shut-off valve according to claim 1, characterized in that: The valve body (1) has an inlet port and an outlet port on both sides, and the valve body (1) and the valve cover (2) form a communicating chamber (9). The communicating chamber (9) is connected to the inlet port and the outlet port. The valve cover (2) has a threaded hole with a matching limiting hole in the middle of its top surface. The threaded hole is connected to the communicating chamber (9). The valve cover (2) is threadedly connected to a valve stem (3) with a matching limiting hole and a threaded hole. The top surface of the valve stem (3) is connected to a gearbox (7). The other end of the gearbox (7) is connected to a handwheel (8).

3. The lifting rod type high-pressure hard-seal shut-off valve according to claim 2, characterized in that: The sealing assembly includes a valve disc (10) installed on the valve stem (3) and fitted with the inner cavity of the communicating chamber (9). The valve disc (10) is divided into an upper connecting end and a lower sealing end, and the sealing end of the valve disc (10) is fitted with the inner wall of the feed port. The cross-section of the valve disc (10) is conical, and an installation groove is provided in the middle of the top surface of the valve disc (10). A buffer groove is provided in the middle of the bottom surface of the installation groove.

4. The lifting rod type high-pressure hard-seal shut-off valve according to claim 3, characterized in that: A pad (11) is installed in the buffer groove. A locking nut (12) is threaded below the valve stem (3). The inner end of the locking nut (12) abuts against the top surface of the valve disc (10) and the outer side is threaded to the mounting groove. The bottom surface of the valve stem (3) abuts against the pad (11). A first sealing groove and a second sealing groove are respectively opened at the connection between the valve body (1) and the valve cover (2). A first Lipseal sealing ring (13) and a sealing ring (14) are respectively installed in the first sealing groove and the second sealing groove.

5. A rising rod type high-pressure hard-seal shut-off valve according to claim 4, characterized in that: A pressure plate (15) is sleeved on the top of the valve stem (3). The bottom surface of the pressure plate (15) is placed between two support rods (4), and the bottom surface of the pressure plate (15) abuts against the top surface of the valve cover (2). A third sealing groove for cooperating with the valve stem (3) is opened on the top surface of the valve cover (2).

6. A rising rod type high-pressure hard-seal shut-off valve according to claim 5, characterized in that: The pressure plate (15) is fitted with a pressure cover (16) that matches the third sealing groove from top to bottom. A graphite packing (17) is installed on the bottom surface of the pressure cover (16). A second Lipseal sealing ring (18) is installed between the bottom surface of the graphite packing (17) and the bottom surface of the third sealing groove.

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