High temperature super high pressure gate valve

Abstract

The utility model belongs to the technical field of gate valve, concretely relates to high temperature superhigh pressure gate valve, including valve body, the upper end of valve body is equipped with support cover through bolt installation, the inside of valve body is provided with shaft coupling, the inside installation of shaft coupling has valve rod, the outside of support cover is hinged with installation screw rod, the outside sliding connection of installation screw rod has pressure cover, the outside of pressure cover is provided with locking mechanism, the outside upper portion of installation screw rod is connected with nut through screw thread, the utility model discloses by the double gate board structure of top center support, make the sealing contact between gate board and upper and lower valve seat more even and close, have guaranteed the reliable sealing of main sealing surface, simultaneously, this structure also has reduced the friction between gate board and valve seat, make the valve opening and closing more nimble, the operation torque is smaller, the valve rod part adopts the sealing form of filler and spacer ring combination, formed multistage sealing barrier, effectively promoted the sealing property.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, specifically to high-temperature and ultra-high-pressure gate valves. Background Technology

[0002] As key opening and closing devices in the critical piping systems of thermal power plants, the performance of power plant valves directly affects the safe and stable operation of the entire power plant system. These valves typically need to operate for extended periods under harsh conditions of high temperature and high pressure, placing extremely high demands on their sealing performance, pressure resistance, and service life. Among them, gate valves are widely used due to their low flow resistance and ease of opening and closing.

[0003] Traditional ultra-high temperature and high pressure gate valves typically rely on a stuffing box structure for stem sealing. The packing is axially compressed using a gland and bolts, causing radial expansion and thus sealing the stem. However, in actual operation, especially under prolonged high temperature and pressure conditions, the packing may age and wear, leading to decreased sealing performance and media leakage. Conventional tightening mechanisms often require regular manual inspection and tightening, which not only increases maintenance workload but also hinders rapid response and emergency handling in the event of sudden leaks, posing certain safety risks.

[0004] Furthermore, to ensure reliable sealing, valve stem packing often requires significant clamping force. This increases friction between the valve stem and packing, accelerates packing wear, and necessitates greater torque for valve opening and closing. In double-gate structures, while the mandrel mechanism effectively achieves a good seal between the two gates and the valve seat, it also places higher demands on the stability of the valve stem guiding and sealing system. Current technologies lack robust clamping force adjustment and anti-loosening mechanisms for valve stem sealing systems, failing to provide a structure capable of maintaining constant sealing clamping force while simultaneously enabling rapid locking or release. Therefore, improvements are needed. Utility Model Content

[0005] The purpose of this invention is to provide a high-temperature and ultra-high-pressure gate valve, which solves the problem that high temperature and high pressure can easily lead to poor sealing performance.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a high-temperature and ultra-high-pressure gate valve, comprising a valve body, a bracket cover bolted to the upper end of the valve body, a coupling inside the valve body, a valve stem mounted inside the coupling, a mounting screw hinged to the outer side of the bracket cover, a pressure cover slidably connected to the outer side of the mounting screw, a locking mechanism on the outer side of the pressure cover, a nut threadedly connected to the upper outer side of the mounting screw, packing between the coupling and the valve stem, a spacer ring in the middle of the packing, a pressure cap slidably connected to the upper end of the coupling, a cylindrical pin fixedly mounted to the lower end of the valve stem, a valve cover mounted to the outer side of the cylindrical pin, and a gate plate on the outer side of the valve cover.

[0007] Preferably, the clamping cap contacts the valve stem, the nut contacts the clamping cap, and the clamping cap contacts the pressure cap, and the clamping cap can provide downward pressure to the pressure cap.

[0008] Preferably, the spacer ring contacts the valve stem, the spacer ring contacts the coupling, the gland contacts the valve stem, and the gland contacts the packing located above the spacer ring. The spacer ring divides the packing into two chambers to guide the clamping force and improve the distribution and sealing effect of the sealant.

[0009] Preferably, an electric device is installed at the upper end of the bracket cover, a handwheel is fixedly installed on the outside of the input shaft of the electric device, the output shaft of the electric device is fixedly connected to the valve stem, and the handwheel can manually drive the valve stem.

[0010] Preferably, the valve body has an internal cavity ring that contacts the gate. A lower valve seat is bolted to the lower end of the valve cover, and an upper valve seat is bolted to the upper outer side of the valve cover. Both the lower and upper valve seats are in contact with the gate. A center is provided between the two gates. The center has a round head structure. Its operating principle is as follows: when the valve stem drives the gate to the closed position, the center is blocked by the internal structure of the valve body, forcing the two gates to open radially, thus achieving forced sealing.

[0011] Preferably, the locking mechanism includes a fixed cover, the upper end of the pressing cover is fixedly installed with the fixed cover, a locking frame is slidably connected inside the fixed cover, two pairs of symmetrically distributed connecting rods are fixedly connected to the outer side of the locking frame, a handle is fixedly connected to the end of the connecting rod away from the locking frame, a spring is provided on the outer side of the connecting rod, and the hexagonal groove of the locking frame is slidably connected to the nut, so that the locking frame can limit the nut.

[0012] Preferably, the locking frame is slidably connected to the pressing cover, the connecting rod is slidably connected to the fixing cover, the handle is slidably connected to the fixing cover, one end of the spring is fixedly connected to the fixing cover, and the other end of the spring is fixedly connected to the locking frame. The spring can provide support force to the locking frame through its elasticity.

[0013] The beneficial effects of this utility model are as follows:

[0014] 1. This utility model adopts a double gate structure supported by the top center, which makes the sealing contact between the gate and the upper and lower valve seats more uniform and tight, ensuring reliable sealing of the main sealing surface. At the same time, this structure also reduces the friction between the gate and the valve seat, making the valve opening and closing more flexible and the operating torque smaller. The valve stem part adopts a sealing form of packing and spacer ring combination, forming a multi-level sealing barrier, which effectively improves the sealing performance.

[0015] 2. This utility model, through the synergistic action of the clamping cap, the spring-driven locking mechanism, and the nut, can provide continuous and stable clamping force for the packing. When the packing wears due to prolonged use, the mechanism can automatically compensate under the action of the spring, preventing media leakage caused by loosening of the clamping force. This significantly improves the reliability and service life of the valve stem seal. The locking mechanism uses the spring to ensure that the locking frame always tends to engage with the nut, forming an effective anti-loosening structure. This effectively resists the influence of valve vibration on the nut's tightness during opening and closing, preventing the nut from loosening and fundamentally eliminating the risk of seal failure caused by a loose clamping cap, resulting in a high safety factor. Attached Figure Description

[0016] Figure 1 This is a perspective view of the overall structure of this utility model;

[0017] Figure 2 For the present utility model Figure 1 Enlarged view of the structure at point A;

[0018] Figure 3 For the present utility model Figure 2 A top-down enlarged view of the locking mechanism.

[0019] In the diagram: 1. Valve body; 2. Bracket cover; 3. Coupling; 4. Valve stem; 5. Mounting screw; 6. Pressure cover; 7. Locking mechanism; 8. Nut; 9. Packing; 10. Spacer ring; 11. Gland; 12. Electric actuator; 13. Handwheel; 14. Lower valve seat; 15. Gate; 16. Top pin; 17. Valve cover; 18. Cylindrical pin; 19. Cavity ring; 20. Upper valve seat; 71. Fixing cover; 72. Locking bracket; 73. Connecting rod; 74. Handle; 75. Spring. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figure 1-3 A high-temperature and ultra-high-pressure gate valve includes a valve body 1. A bracket cover 2 is bolted to the upper end of the valve body 1. A coupling 3 is installed inside the valve body 1. A valve stem 4 is installed inside the coupling 3. A mounting screw 5 is hinged to the outside of the bracket cover 2. A pressure cover 6 is slidably connected to the outside of the mounting screw 5. A locking mechanism 7 is provided on the outside of the pressure cover 6. A nut 8 is threadedly connected to the upper part of the outside of the mounting screw 5. Packing 9 is provided between the coupling 3 and the valve stem 4. A spacer ring 10 is provided in the middle of the packing 9. A pressure cover 11 is slidably connected inside the upper end of the coupling 3. A cylindrical pin 18 is fixedly installed at the lower end of the valve stem 4. A valve cover 17 is installed on the outside of the cylindrical pin 18. A gate plate 15 is provided on the outside of the valve cover 17.

[0022] Please see Figure 1-3 The clamping cap 6 contacts the valve stem 4, the nut 8 contacts the clamping cap 6, and the clamping cap 6 contacts the gland 11. The clamping cap 6 can provide downward pressure on the gland 11. The spacer ring 10 contacts the valve stem 4 and the coupling 3. The gland 11 contacts the valve stem 4 and the packing 9 located above the spacer ring 10. The spacer ring 10 divides the packing 9 into two chambers to guide the clamping force and improve the distribution and sealing effect of the sealant. An electric actuator 12 is installed at the upper end of the bracket cover 2. A handwheel 13 is fixedly installed on the outside of the input shaft of the electric device 12. The output shaft of the electric device 12 is fixedly connected to the valve stem 4. The handwheel 13 can manually drive the valve stem 4. A cavity ring 19 is provided inside the valve body 1. The cavity ring 19 contacts the gate 15. The lower end of the valve cover 17 is bolted to the lower valve seat 14. The upper part of the outer side of the valve cover 17 is bolted to the upper valve seat 20. Both the lower valve seat 14 and the upper valve seat 20 are in contact with the gate 15. A core 16 is provided between the two gates 15. The core 16 has a round head structure. Its operating principle is: when the valve stem 4 drives the gate 15 to the closed position, the core 16 is blocked by the internal structure of the valve body 1, forcing the two gates 15 to open radially, thus achieving forced sealing.

[0023] Please see Figure 1-3The locking mechanism 7 includes a fixed cover 71. The fixed cover 71 is fixedly installed on the upper end of the pressing cover 6. A locking frame 72 is slidably connected inside the fixed cover 71. Two pairs of symmetrically distributed connecting rods 73 are fixedly connected to the outer side of the locking frame 72. A handle 74 is fixedly connected to the end of the connecting rod 73 away from the locking frame 72. A spring 75 is provided on the outer side of the connecting rod 73. The hexagonal groove of the locking frame 72 is slidably connected to the nut 8. The locking frame 72 can limit the nut 8. The locking frame 72 is slidably connected to the pressing cover 6. The connecting rod 73 is slidably connected to the fixed cover 71. The handle 74 is slidably connected to the fixed cover 71. One end of the spring 75 is fixedly connected to the fixed cover 71. The other end of the spring 75 is fixedly connected to the locking frame 72. The spring 75 can provide support force to the locking frame 72 through its elasticity.

[0024] The specific implementation process of this utility model is as follows:

[0025] I. Working principle of valve stem 4 sealing and clamping mechanism:

[0026] Initial tightening: By tightening nut 8, the pressure cover 6 is pushed downward, thereby transmitting pressure to the pressure cover 11. The pressure cover 11 then applies pressure to the packing 9 inside the coupling 3, causing it to expand radially and tightly wrap around the valve stem 4, forming an initial seal.

[0027] Automatic compensation and anti-loosening: After the nut 8 is tightened, the spring 75 in the locking mechanism 7 will push the locking frame 72 so that the hexagonal groove on it fits tightly with the outer hexagonal surface of the nut 8. This structure can prevent the nut 8 from rotating and loosening due to vibration or other reasons. When the packing 9 wears due to long-term use, the elastic force of the spring 75 will continue to act through the locking frame 72 and the pressure cover 6, pushing the pressure cover 11 to follow, automatically compensating for the reduced clamping force due to the wear of the packing 9, thereby achieving long-term stability of the sealing effect.

[0028] Maintenance operation: When it is necessary to replace the packing 9, the operator pulls the handles 74 on both sides outward. The connecting rod 73 drives the locking frame 72 to overcome the elastic force of the spring 75 and move in the direction of disengaging from the nut 8, so that it is disengaged from the nut 8. At this time, the nut 8 can rotate freely, so as to loosen the nut 8 and release the pressure on the packing 9, thereby replacing the packing 9.

[0029] II. Valve opening and closing working principle:

[0030] To close the valve: The electric actuator 12 or the manual drive handwheel 13 is activated, causing the valve stem 4 to rotate clockwise and move downwards. The valve stem 4, through the cylindrical pin 18 at its lower end, drives the valve cover 17 and the gate 15 connected thereto to move downwards. When the gate 15 approaches the closed position, the top center 16 will open the two gates 15 on the left and right sides, pressing them tightly against the lower valve seat 14 of the valve body 1 and the upper valve seat 20 of the valve cover 17, forming a metal-to-metal hard seal, thereby cutting off the flow of the medium.

[0031] Opening the valve: The electric actuator 12 rotates counterclockwise, causing the valve stem 4 to move upward. The valve stem 4, through the cylindrical pin 18, causes the valve cover 17 and the gate 15 to rise together. After leaving the sealing surface, the opening force of the top core 16 on the gate 15 is released, the gate 15 retracts, and disengages from the lower valve seat 14 and the upper valve seat 20, thus opening the medium passage.

[0032] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A high-temperature, ultra-high-pressure gate valve, comprising a valve body (1), characterized in that: The upper end of the valve body (1) is bolted with a bracket cover (2). The valve body (1) is equipped with a coupling (3). The valve stem (4) is installed inside the coupling (3). The bracket cover (2) is hinged with a mounting screw (5). The mounting screw (5) is slidably connected with a pressure cover (6). The pressure cover (6) is equipped with a locking mechanism (7). The upper part of the mounting screw (5) is threaded with a nut (8). The coupling (3) and the valve stem (4) are equipped with a packing (9). The packing (9) is equipped with a spacer ring (10) in the middle. The upper end of the coupling (3) is slidably connected with a pressure cover (11). The lower end of the valve stem (4) is fixedly equipped with a cylindrical pin (18). The cylindrical pin (18) is equipped with a valve cover (17). The valve cover (17) is equipped with a gate plate (15) on the outside.

2. The high-temperature and ultra-high-pressure gate valve according to claim 1, characterized in that: The clamping cap (6) is in contact with the valve stem (4), the nut (8) is in contact with the clamping cap (6), and the clamping cap (6) is in contact with the pressure cap (11).

3. The high-temperature and ultra-high-pressure gate valve according to claim 1, characterized in that: The spacer (10) is in contact with the valve stem (4), the spacer (10) is in contact with the coupling (3), the gland (11) is in contact with the valve stem (4), and the gland (11) is in contact with the packing (9) located above the spacer (10).

4. The high-temperature and ultra-high-pressure gate valve according to claim 1, characterized in that: An electric device (12) is installed on the upper end of the bracket cover (2). A handwheel (13) is fixedly installed on the outside of the input shaft of the electric device (12). The output shaft of the electric device (12) is fixedly connected to the valve stem (4).

5. The high-temperature and ultra-high-pressure gate valve according to claim 1, characterized in that: The valve body (1) has a cavity ring (19) inside, which contacts the gate (15). The lower end of the valve cover (17) is bolted with a lower valve seat (14), and the upper outer part of the valve cover (17) is bolted with an upper valve seat (20). Both the lower valve seat (14) and the upper valve seat (20) are in contact with the gate (15). A core (16) is provided between the two gates (15).

6. The high-temperature and ultra-high-pressure gate valve according to claim 1, characterized in that: The locking mechanism (7) includes a fixed cover (71), the upper end of the pressing cover (6) is fixedly installed with the fixed cover (71), the inside of the fixed cover (71) is slidably connected with a locking frame (72), the outside of the locking frame (72) is fixedly connected with two pairs of symmetrically distributed connecting rods (73), the end of the connecting rod (73) away from the locking frame (72) is fixedly connected with a handle (74), the outside of the connecting rod (73) is provided with a spring (75), and the hexagonal groove of the locking frame (72) is slidably connected with the nut (8).

7. The high-temperature and ultra-high-pressure gate valve according to claim 6, characterized in that: The locking frame (72) is slidably connected to the pressing cover (6), the connecting rod (73) is slidably connected to the fixing cover (71), the handle (74) is slidably connected to the fixing cover (71), one end of the spring (75) is fixedly connected to the fixing cover (71), and the other end of the spring (75) is fixedly connected to the locking frame (72).

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