Gate valve capable of compensating high-temperature and high-pressure steam injection

Abstract

The utility model relates to a gate valve capable of injecting high-temperature and high-pressure steam in a compensation mode, which belongs to the technical field of thermal recovery gate valves and comprises a valve body and a valve seat, a valve rod and a double-valve-plate assembly are arranged inside the valve body, and the valve rod is connected with the double-valve-plate assembly in a hanging mode. The double-valve-plate assembly comprises a left valve plate and a right valve plate, and the left valve plate and the right valve plate are elastically connected through a spring. The left valve plate and the right valve plate are embedded into the hanging grooves through the hanging lugs to achieve hanging connection with the valve rod, and movable gaps exist between the hanging grooves and the hanging lugs; the left valve plate, the right valve plate and the valve seat are in inclined plane fit; the valve seat and the valve body are connected through brazing, so that the overall service life of the gate valve is prolonged; the split type double-valve-plate assembly of the asymmetric structure is adopted, the spring and the oval tensioning piece are matched to achieve double sealing, the technical problem that an existing gate valve is not tightly closed is solved, a damaged valve seat can be detached, repaired and brazed again, and the maintenance cost of the gate valve is greatly reduced; the height of the lower portion of the valve body is reduced, and manufacturing cost of the gate valve is reduced.

Description

Gate valve for compensating high-temperature and high-pressure steam injection Technical Field

[0001] This utility model relates to a gate valve for compensating for high-temperature and high-pressure steam injection, belonging to the field of thermal recovery gate valve technology. Background Technology

[0002] Some offshore platforms in the Bohai Sea employ a production process involving high-temperature, high-pressure steam injection (370℃, 18-20.1MPa) followed by well shut-in. This process requires high-temperature and high-pressure resistant thermal recovery gate valves as core control components. However, existing thermal recovery gate valves present numerous technical problems in practical use, severely impacting platform production efficiency and equipment operating costs. Specific issues are as follows:

[0003] 1. The existing gate valve uses graphite seals. The inherent properties of graphite material make it susceptible to erosion under the impact of high-pressure steam fluid, directly shortening the overall service life of the gate valve and requiring frequent replacement of sealing components or even the entire gate valve.

[0004] 2. The existing gate valve adopts a bidirectional sealing design, but there is an inherent gap between the existing valve plate 7 and the existing valve seat 8, and the sealing surface is easily damaged during use, which eventually causes the valve to not close tightly and completely lose its function of stopping the fluid, affecting the stability of the steam injection process.

[0005] 3. The existing gate valve body is a one-piece design, and the fluid and valve body are in direct contact with the external environment, resulting in serious heat loss; although some well sites wrap the gate valve with insulation material, the insulation effect is poor, which further reduces the energy utilization rate of steam injection.

[0006] 4. The existing gate valve has a separate connection between the valve seat and the valve body. The structure with graphite seal is not only prone to seal erosion, but also cannot be repaired separately after the valve seat is damaged. The entire gate valve needs to be replaced, resulting in high maintenance costs. Summary of the Invention

[0007] Based on the shortcomings of the existing technology, the technical problem to be solved by this utility model is to provide a gate valve that can compensate for high-temperature and high-pressure steam injection, thereby solving the problems of poor valve closure, large heat loss, and high maintenance and material costs caused by graphite seal erosion in existing gate valves, improving the sealing stability and service life of the gate valve under high-temperature and high-pressure steam conditions, and achieving cost reduction and efficiency improvement.

[0008] The compensable gate valve for injecting high-temperature and high-pressure steam according to this utility model includes a valve body and a valve seat. The valve body is provided with a valve stem and a double valve plate assembly. The valve stem is connected to the double valve plate assembly and can drive the double valve plate assembly to perform up and down reciprocating motion.

[0009] The dual valve plate assembly is a split asymmetrical structure, which includes a left valve plate and a right valve plate. The left valve plate and the right valve plate are elastically connected by a spring. The spring can actively push the two valve plates to move towards the double-sided valve seats, so that the two valve plates are tightly pressed against the valve seats to form an initial seal.

[0010] Both the left and right valve plates have lugs on their tops, and the valve stem has mounting grooves on both sides that mate with the lugs. The left and right valve plates are connected to the valve stem by inserting the lugs into the mounting grooves, and there is a play between the mounting grooves and the lugs. The left and right valve plates are fitted with the valve seats at an angle to improve the fit between the double valve plate assembly and the valve seats. The distance between the top surface of the left and right valve plates and the bottom surface of the valve stem is different.

[0011] The dual-valve plate assembly enables relative movement between the left and right valve plates. The left and right valve plates are fitted with the valve seat at an angle. When one valve plate has already sealed tightly against the valve seat and cannot move further downward, the other valve plate can continue to move downward under the pressure of the bottom of the valve stem by means of the movable gap between the mounting groove and the mounting lug, forming a relative misalignment between the two valve plates, further enhancing the sealing performance.

[0012] Preferably, an elliptical tensioning member is provided between the left valve plate and the right valve plate. In the event that the valve is not closed tightly or the spring structure fails, the elliptical tensioning member can be deflected in conjunction with the downward pressing action of the valve stem, which will further push the two valve plates to move towards the double-sided valve seats and press them together to achieve secondary compression and sealing.

[0013] Furthermore, the valve body and valve seat are connected by brazing, so that there is no gap between the valve seat and the valve body, which structurally avoids the erosion of the sealing parts by high-pressure steam fluid; at the same time, the valve seat can be disassembled by machining. If the valve seat is damaged, it can be disassembled and machined for repair. The repaired valve seat can be re-brazed into the valve body without replacing the entire gate valve.

[0014] Preferably, the height of the left valve plate is less than that of the right valve plate, the bottom surfaces of the left valve plate and the right valve plate are flush, and the top surface of the left valve plate is lower than that of the right valve plate.

[0015] Preferably, a handwheel is installed on the top of the valve body, and the handwheel is connected to the valve stem for transmission. By turning the handwheel, the valve stem can be driven to move up and down.

[0016] The advantages of this utility model compared with the prior art are:

[0017] 1. The valve seat and valve body of this utility model are connected by brazing without any gap, which completely solves the problem that traditional graphite seals are easily eroded by high pressure fluids, and effectively extends the overall service life of the gate valve.

[0018] 2. The dual valve plate assembly with a split asymmetrical structure, combined with springs and elliptical tensioners, achieves double sealing. The spring structure achieves the initial sealing, and the elliptical tensioners, combined with the downward pressure of the valve stem, achieve the secondary compression sealing, which completely solves the technical problem of the existing gate valve not closing tightly and improves the stability of the steam injection process.

[0019] 3. Damaged valve seats can be disassembled, repaired, and re-brazed, eliminating the need to replace the entire gate valve and significantly reducing the maintenance cost of the gate valve;

[0020] 4. This utility model relies on the double seal of spring and elliptical tensioning element, and no longer depends on the long guide section of the traditional valve plate to ensure sealing accuracy. Therefore, the lower height of the valve body is reduced, the amount of material used is reduced, and the manufacturing cost of the gate valve is reduced. Attached Figure Description

[0021] Figure 1 is a structural schematic diagram of this utility model;

[0022] Figure 2 is a structural schematic diagram of the valve stem and double valve plate assembly;

[0023] Figure 3 is a schematic diagram of the structure of an existing gate valve.

[0024] In the diagram: 1. Handwheel; 2. Valve body; 3. Double valve plate assembly; 31. Right valve plate; 311. Lug; 32. Left valve plate; 33. Elliptical tensioner; 34. Spring; 4. Valve seat; 5. Valve stem; 6. Graphite seal; 7. Existing valve plate; 8. Existing valve seat. Detailed Implementation

[0025] The present invention will be further described below with reference to specific embodiments.

[0026] As shown in Figures 1-3, this embodiment is achieved through the following technical solution: It includes a valve body 2 and a valve seat 4. The valve body 2 contains a valve stem 5 and a double valve plate assembly 3. The valve stem 5 is connected to the double valve plate assembly 3, and the valve stem 5 can drive the double valve plate assembly 3 to reciprocate up and down. The double valve plate assembly 3 is a split asymmetrical structure, including a left valve plate 32 and a right valve plate 31. The left valve plate 32 and the right valve plate 31 are elastically connected by a spring 34. The spring 34 can actively push the two valve plates towards the double valve seats 4, causing the two valve plates to press tightly against the valve seats 4 to form an initial seal. The top of both the left valve plate 32 and the right valve plate 31 is provided with a lug 311. The valve stem 5 has mounting grooves on both sides that mate with the lugs 311. The left valve plate 32 and the right valve plate 31 are connected... The lug 311 is embedded in the mounting groove to connect with the valve stem 5, and there is a play gap between the mounting groove and the lug 311. The left valve plate 32 and the right valve plate 31 are fitted with the valve seat 4 at an angle to improve the fit between the double valve plate assembly 3 and the valve seat 4. The top surfaces of the left valve plate 32 and the right valve plate 31 are spaced apart from the bottom surface of the valve stem 5. The double valve plate assembly 3 can achieve relative movement between the left valve plate 32 and the right valve plate 31. The left valve plate 32 and the right valve plate 31 are fitted with the valve seat 4 at an angle. When one valve plate has already sealed tightly against the valve seat 4 and cannot move further downward, the other valve plate can continue to move downward under the pressure of the bottom end of the valve stem 5 by means of the play gap between the mounting groove and the lug 311, forming a relative misalignment between the two valve plates, further enhancing the sealing performance.

[0027] In this embodiment, an elliptical tensioning member 33 is also provided between the left valve plate 32 and the right valve plate 31. When the valve is not closed tightly or the spring 34 structure fails, the elliptical tensioning member 33 can be deflected in conjunction with the downward action of the valve stem 5, further pushing the two valve plates to move towards the double-sided valve seats 4 and sticking together, so as to achieve secondary compression and sealing.

[0028] The valve body 2 and valve seat 4 are brazed together, eliminating any gaps between them and structurally preventing erosion of the sealing area by high-pressure steam fluid. Furthermore, the valve seat 4 can be disassembled by machining. If damaged, it can be disassembled and repaired by machining, and then re-brazed back into the valve body 2 without requiring complete replacement of the gate valve. The left valve plate 32 is shorter than the right valve plate 31, with its bottom surface flush with the right valve plate 31, and its top surface lower than the right valve plate 31. A handwheel 1 is mounted on the top of the valve body 2, connected to the valve stem 5. Twisting the handwheel 1 moves the valve stem 5 up and down.

[0029] The working process of this utility model is as follows:

[0030] Twisting the handwheel 1 causes the valve stem 5 and the double valve plate assembly 3 to move downwards. Under the push of the spring 34, the right valve plate 31 and the left valve plate 32 are pressed tightly against the valve seat 4 to form an initial seal.

[0031] Continue turning handwheel 1. When the left valve plate 32 has already sealed tightly against the valve seat 4 and can no longer move downwards, the right valve plate 31 can continue to move downwards under the pressure of the bottom end of the valve stem 5 by means of the movable gap between the hook groove and the hook ear 311, forming a relative misalignment between the two valve plates. At the same time, the elliptical tensioning member 33 is deflected, further pushing the two valve plates to move towards the double-sided valve seats 4 and stick together, achieving secondary compression sealing and further enhancing the sealing performance.

Claims

1. A gate valve for compensating for high-temperature and high-pressure steam injection, characterized in that, The valve includes a valve body (2) and a valve seat (4). The valve body (2) is equipped with a valve stem (5) and a double valve plate assembly (3). The valve stem (5) is connected to the double valve plate assembly (3). The double valve plate assembly (3) is a split asymmetrical structure. The double valve plate assembly (3) includes a left valve plate (32) and a right valve plate (31). The left valve plate (32) and the right valve plate (31) are elastically connected by a spring (34). The top of the left valve plate (32) and the right valve plate (31) are both provided with The valve stem (5) has a hanging ear (311) and a hanging groove that mates with the hanging ear (311) on both sides. The left valve plate (32) and the right valve plate (31) are connected to the valve stem (5) by inserting the hanging ear (311) into the hanging groove. There is a gap between the hanging groove and the hanging ear (311). The left valve plate (32), the right valve plate (31) and the valve seat (4) are fitted with an inclined surface. The distance between the top surface of the left valve plate (32) and the right valve plate (31) and the bottom surface of the valve stem (5) is different.

2. The gate valve for compensating high-temperature and high-pressure steam injection according to claim 1, characterized in that, An elliptical tensioning member (33) is also provided between the left valve plate (32) and the right valve plate (31).

3. The gate valve for compensating high-temperature and high-pressure steam injection according to claim 1, characterized in that, The valve body (2) and valve seat (4) are connected by brazing, and there is no gap between the valve seat (4) and the valve body (2).

4. The gate valve for compensating high-temperature and high-pressure steam injection according to claim 2, characterized in that, The height of the left valve plate (32) is less than that of the right valve plate (31). The bottom surfaces of the left valve plate (32) and the right valve plate (31) are flush, and the top surface of the left valve plate (32) is lower than that of the right valve plate (31).

5. The gate valve for compensating high-temperature and high-pressure steam injection according to claim 3, characterized in that, The valve body (2) is equipped with a handwheel (1) on top, and the handwheel (1) is connected to the valve stem (5) in a transmission manner.

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