A top-mounted ball valve equipped with deep-sea pressure compensation and emergency grease injection interface

Abstract

The application relates to the technical field of valves, in particular to an upper-mounted ball valve equipped with a deep-sea pressure compensation and an emergency grease injection interface, one side of the valve seat away from the ball body is further provided with a pressure compensation assembly, the pressure compensation assembly drives the valve seat to abut against the ball body through the seawater communication outside the valve body, a first pressure balance assembly is assembled outside the driving mechanism, a grease injection channel extending to the ball body is further arranged on the valve seat, an emergency grease injection interface in communication with the grease injection channel is further arranged on the valve body, a second pressure balance assembly is assembled outside the emergency grease injection interface, the pressure compensation assembly further controls the on-off of the grease injection channel, the pressure compensation assembly and the emergency grease injection interface in direct communication with seawater are arranged, the reliable pressure self-adaptive compensation capacity is achieved under the deep-sea environment, and the emergency grease injection system can still effectively work under the super-high hydrostatic pressure.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and in particular to a top-mounted ball valve equipped with a deep-sea pressure compensation and emergency grease injection interface. Background Technology

[0002] Top-mounted ball valves adopt an integral valve body structure, and their internal components such as the valve seat and ball can be installed and removed from the top of the valve body. Compared with side-mounted ball valves, they have advantages such as fewer leakage points, higher structural strength, and convenient online maintenance. They are widely used in critical working conditions such as oil and gas pipelines and offshore platforms.

[0003] As offshore oil and gas development moves into deeper waters, valves need to be installed hundreds to thousands of meters below sea level, enduring extremely high hydrostatic pressure. In this environment, existing top-entry ball valves face two major technical challenges: First, deep-sea valves not only bear the internal pressure of the medium but also resist enormous external seawater pressure. Drastic changes in the internal and external pressure differential can easily lead to uncontrolled pressure variation in the valve seat seal. Existing pressure compensation structures using springs and other components have limited compensation capabilities, making it difficult to achieve dynamic balance of the sealing pressure, easily resulting in seal failure or excessive opening and closing torque causing jamming. Second, replacement costs in the deep-sea environment are extremely high. Once the valve seat sealing surface is damaged due to long-term operation, leading to leakage, traditional grease injectors, while capable of temporary repair by injecting grease, are prone to failure under the high pressure of the deep sea due to excessive pressure differential in their internal one-way sealing structure, preventing grease injection and even turning the grease injector itself into a new leakage channel.

[0004] Therefore, how to enable top-mounted ball valves to have reliable pressure adaptive compensation capabilities in deep-sea environments and ensure that emergency grease injection systems can still work effectively under ultra-high hydrostatic pressure is a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a top-mounted ball valve equipped with a deep-sea pressure compensation and emergency grease injection interface. By setting a pressure compensation component that is directly connected to seawater and an emergency grease injection interface, this invention has reliable pressure adaptive compensation capability in the deep-sea environment and ensures that the emergency grease injection system can still work effectively under ultra-high hydrostatic pressure.

[0006] The technical solution adopted in this invention is as follows: A top-mounted ball valve equipped with a deep-sea pressure compensation and emergency grease injection interface includes a valve body, a ball, a valve seat, a valve stem, and a drive mechanism. The valve body is also connected to a valve cover. The ball is sealed and fitted inside the valve body with the valve seat. One end of the valve stem is connected to the ball, and the other end passes through the valve cover and is connected to the drive mechanism. The drive mechanism drives the ball to rotate via the valve stem to control the opening and closing of the flow channel. A pressure compensation component is also provided on the side of the valve seat away from the ball. The pressure compensation component communicates with seawater outside the valve body to drive the valve seat to press against the ball. A first pressure balancing component is mounted on the outside of the drive mechanism. The valve seat is also provided with a grease injection channel extending to the ball. The valve body is also provided with an emergency grease injection interface communicating with the grease injection channel. A second pressure balancing component is mounted on the outside of the emergency grease injection interface. The pressure compensation component also controls the opening and closing of the grease injection channel.

[0007] A floating seat and an elastic compensation component are provided between the valve seat and the valve body. The floating seat has a transition channel for connecting the emergency grease injection port and the grease injection channel. The elastic compensation component pushes the valve seat to squeeze towards the ball. At the same time, the transition channel and the grease injection channel are staggered and blocked. When the valve seat squeezes the elastic compensation component to abut against the floating seat, the emergency grease injection port is connected to the grease injection channel through the transition channel.

[0008] The pressure compensation component is located at the end of the floating seat away from the valve seat, and is used to control the floating seat to move closer to or further away from the valve seat. When the elastic compensation component fails or when the pressure compensation component controls the floating seat to abut against the valve seat, the emergency grease injection port is connected to the grease injection channel through a transition channel.

[0009] The valve body has an installation cavity for mounting the floating seat and the valve seat. The pressure compensation assembly includes a push rod, a piston chamber, a piston body, and a piston rod passing through the piston body. The side wall of the valve body also has an installation hole communicating with the installation cavity. The valve seat and the inner wall of the valve body also have a flow channel. The installation hole communicates with the flow channel through the flow channel. One end of the push rod is inserted into the installation hole and the other end abuts against the piston rod. A first sealing ring is also provided between the push rod and the installation hole. The piston chamber is welded to the outer wall of the valve body and is also covered by the piston rod and the push rod. The piston body seals and divides the piston chamber into a pressure boosting chamber and a normal pressure chamber. One end of the piston chamber corresponding to the pressure boosting chamber has a pressure boosting hole communicating with the outside. When the pressure in the flow channel inside the valve body is greater than that outside, the piston rod blocks the pressure boosting hole. When the pressure outside the valve body is greater than that in the flow channel, the piston rod opens the pressure boosting hole. At the same time, the piston rod drives the push rod to push the floating seat towards the valve seat.

[0010] The inner edge of the mounting hole has a protrusion that abuts against the floating seat. The end of the floating seat extends into the mounting hole with an inclined portion. The push rod pushes the floating seat toward the valve seat through the inclined portion.

[0011] A floating gap is formed between the floating seat and the valve seat by an elastic compensation component. The elastic compensation component includes a spring body and a spring seat. The valve seat is provided with a spring cavity. The spring seat is threadedly connected to the floating seat. One end of the spring body is sleeved on the spring seat and the other end is embedded in the spring cavity. A second sealing ring is provided between the floating seat and the valve seat.

[0012] The valve seat near the ball abuts against a limiting block, and an elastic buffer block is sandwiched between the limiting block and the valve seat. The limiting block is fixedly connected to the inner wall of the valve body by fasteners. A guide rod is threadedly connected to the inner wall of the valve body. The valve seat away from the ball has a guide hole for inserting the guide rod. A third sealing ring is provided between the valve seat and the valve body.

[0013] The first pressure balancing assembly includes a first housing, a first elastic rubber bladder, and a first end cap that is fastened to the first housing. The first housing has a first dynamic balancing cavity for the drive mechanism to be accommodated. The first end cap has a plurality of first filter guide holes and a first seawater compensation cavity inside the first end cap. The first elastic rubber bladder is sandwiched between the first end cap and the first housing to separate the first seawater compensation cavity from the first dynamic balancing cavity.

[0014] The emergency grease injection interface is connected to an electric grease injection device. The second pressure balancing component includes a second housing, a second elastic rubber bladder, and a second end cap that is fastened to the second housing. The second housing has a second dynamic balancing chamber that accommodates the electric grease injection device. The second end cap has a plurality of second filter guide holes and a second seawater compensation chamber inside the second end cap. The second elastic rubber bladder is sandwiched between the second end cap and the second housing to separate the second seawater compensation chamber from the second dynamic balancing chamber.

[0015] An irregularly shaped sealing ring is also sandwiched between the valve cover and the valve body. The irregularly shaped sealing ring has an opening at one end corresponding to the gap between the valve cover and the valve body, and the other end of the irregularly shaped sealing ring has an inward portion.

[0016] The beneficial effects of this invention are as follows: By setting a pressure compensation component that is directly connected to seawater, the valve seat is driven to press against the ball using seawater pressure. This allows for dynamic adjustment of the sealing pressure ratio according to changes in external pressure in the deep-sea environment, achieving automatic balance of internal and external pressure differences. This effectively avoids sealing failure or jamming caused by drastic pressure fluctuations, significantly improving sealing reliability under deep-sea conditions. By setting an emergency grease injection interface connected to the grease injection channel and assembling a second pressure balancing component on its outside, the pressure inside and outside the interface can be balanced, ensuring that grease can still be smoothly injected for emergency repairs under ultra-high hydrostatic pressure. This overcomes the problem of traditional grease injection nozzles failing due to excessive pressure differences. By assembling a first pressure balancing component on the outside of the drive mechanism, the pressure inside and outside the drive mechanism can be balanced, reducing the adverse effects of deep-sea high pressure on the valve opening and closing torque, ensuring smooth and stable valve operation. By simultaneously controlling the opening and closing of the grease injection channel through the pressure compensation component, the linkage between pressure compensation and emergency grease injection functions is realized, simplifying the structure, improving system integration and control reliability, and preventing accidental connection of the channel in non-grease injection states. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0018] Figure 1 This is a cross-sectional schematic diagram of the present invention; Figure 2 for Figure 1 A magnified view of a portion of point A in the middle; Figure 3 for Figure 2 A magnified view of a portion of point B in the middle; In the diagram, 1-valve body, 2-ball, 3-valve seat, 4-valve stem, 5-drive mechanism, 6-valve cover, 7-pressure compensation assembly, 8-first pressure balance assembly, 9-grease injection channel, 10-emergency grease injection port, 11-second pressure balance assembly, 12-floating seat, 13-transition channel, 14-mounting cavity, 15-push rod, 16-piston cavity, 17-piston body, 18-piston rod, 19-mounting hole, 20-flow channel, 21-first sealing ring, 22-pressurization chamber, 23-normal pressure chamber, 24-pressurization hole, 25-bore, 26-inclined part, 27-floating clearance, 28-spring body, 29-spring seat, 30-spring Cavity, 31-Second sealing ring, 32-Limiting block, 33-Elastic buffer block, 34-Fastener, 35-Guide rod, 36-Guide hole, 37-Third sealing ring, 38-First housing, 39-First elastic rubber bladder, 40-First end cap, 41-First dynamic balance cavity, 42-First filter guide hole, 43-First seawater compensation cavity, 44-Electric grease injection device, 45-Second housing, 46-Second elastic rubber bladder, 47-Second end cap, 48-Second dynamic balance cavity, 49-Second filter guide hole, 50-Second seawater compensation cavity, 51-Irregular sealing ring, 52-Opening, 53-Inner section, 101-Flow channel. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0020] It should be noted that all uses of "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of the present invention. Subsequent embodiments will not explain this in detail.

[0021] The directional and positional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for illustrating and understanding this invention, and not for limiting the scope of protection of this invention.

[0022] like Figures 1 to 3As shown in the figure, an embodiment of the present invention is disclosed, comprising a top-mounted ball valve equipped with a deep-sea pressure compensation and an emergency grease injection interface, including a valve body 1, a ball 2, a valve seat 3, a valve stem 4, and a drive mechanism 5. The valve body 1 is also connected to a valve cover 6. The ball 2 is sealed and fitted with the valve seat 3 inside the valve body 1. One end of the valve stem 4 is connected to the ball 2, and the other end passes through the valve cover 6 and is connected to the drive mechanism 5. The drive mechanism 5 drives the ball 2 to rotate via the valve stem 4 to control the opening and closing of the flow channel 101. A pressure compensation component 7 is also provided on the side of the valve seat 3 away from the ball 2. The pressure compensation component 7 communicates with seawater outside the valve body 1 to drive the valve seat 3 to press against the ball 2. A first pressure balancing component 8 is mounted on the outside of the drive mechanism 5. A grease injection channel 9 extending to the ball 2 is also provided on the valve seat 3. An emergency grease injection interface 10 communicating with the grease injection channel 9 is also provided on the valve body 1. A second pressure balancing component 11 is mounted on the outside of the emergency grease injection interface 10. The pressure compensation component 7 also controls the opening and closing of the grease injection channel 9.

[0023] The beneficial effects of this design are as follows: By setting up a pressure compensation component directly connected to seawater, the valve seat is driven to press against the ball using seawater pressure. This allows for dynamic adjustment of the sealing pressure ratio based on changes in external pressure in the deep-sea environment, achieving automatic balance of internal and external pressure differences. This effectively avoids sealing failure or jamming caused by drastic pressure fluctuations, significantly improving sealing reliability under deep-sea conditions. Furthermore, by setting up an emergency grease injection port connected to the grease injection channel and equipping it with a second pressure balancing component, the pressure inside and outside the port can be balanced. This ensures that grease can still be smoothly injected for emergency repairs even under extremely high hydrostatic pressure, overcoming the problem of traditional grease injection nozzles failing due to excessive pressure differences. The first pressure balancing component, installed on the outside of the drive mechanism, balances the pressure inside and outside the drive mechanism relative to the seawater, reducing the adverse effects of deep-sea high pressure on the valve's opening and closing torque, ensuring smooth and stable valve operation. Simultaneously controlling the opening and closing of the grease injection channel through the pressure compensation component achieves linkage between pressure compensation and emergency grease injection functions, simplifying the structure, improving system integration and control reliability, and preventing accidental connection of the channel in non-grease injection states.

[0024] Furthermore, a floating seat 12 and an elastic compensation component abutting between the valve seat 3 and the valve body 1 are provided. The floating seat 12 has a transition channel 13 for connecting the emergency grease injection port 10 and the grease injection channel 9. The elastic compensation component pushes the valve seat 3 to squeeze towards the ball 2. At the same time, the transition channel 13 and the grease injection channel 9 are staggered and blocked. When the valve seat 3 squeezes the elastic compensation component to abut against the floating seat 12, the emergency grease injection port 10 is connected to the grease injection channel 9 through the transition channel 13.

[0025] The beneficial effects of this design are as follows: By setting up the elastic compensation component, on the one hand, it provides initial preload to the valve seat under normal operating conditions to ensure low-pressure sealing; on the other hand, it allows the valve seat to float under external pressure, working in conjunction with the pressure compensation component to achieve high-pressure self-balancing. The valve seat displacement under pressure controls the opening and closing of the transition channel and the grease injection channel. When the valve seat compresses the elastic compensation component to its limit position due to increased external pressure or the valve seat moving away from the ball, the grease injection path is automatically connected, realizing the mechanical interlock of "grease injection only when pressure is reached", avoiding misoperation. In the non-grease injection state, the staggered blocking design cuts off the connection between the emergency grease injection interface and the valve cavity, eliminating the risk of media leakage through the grease injection channel, and at the same time preventing high-pressure seawater backflow and contamination of the sealing grease.

[0026] In a further configuration, the pressure compensation component 7 is located at the end of the floating seat 12 away from the valve seat 3, and the pressure compensation component 7 is used to control the floating seat 12 to move closer to or further away from the valve seat 3. When the elastic compensation component fails or when the pressure compensation component 7 controls the floating seat 12 to abut against the valve seat 3, the emergency grease injection port 10 is connected to the grease injection channel 9 through the transition channel 13.

[0027] The beneficial effects of this configuration are as follows: By controlling the movement of the floating seat through the pressure compensation component, conventional grease injection can be achieved by relying on the pressure on the valve seat when the elastic compensation component is working normally; when the elastic compensation component fails due to fatigue, corrosion, or other reasons, the pressure compensation component can still actively push the floating seat to abut against the valve seat, forcibly opening the grease injection channel and forming a redundant start-up mechanism. By directly controlling the floating seat through the pressure compensation component, the floating seat can be actively driven to move towards the valve seat until it abuts when emergency grease injection is needed. This overcomes the passivity of traditional solutions that rely solely on medium pressure or spring force for connection, and improves the reliability of emergency operation in the high-pressure environment of the deep sea. Even if the elastic compensation component completely loses its driving ability, the pressure compensation component can still establish a grease injection path by controlling the floating seat, avoiding the risk of the entire emergency grease injection system being paralyzed due to the failure of a single component, and significantly improving the survivability of the valve under harsh deep-sea conditions.

[0028] Further, the valve body 1 is provided with a mounting cavity 14 for mounting the floating seat 12 and the valve seat 3. The pressure compensation assembly 7 includes a push rod 15, a piston chamber 16, a piston body 17, and a piston rod 18 passing through the piston body 17. The side wall of the valve body 1 also has a mounting hole 19 communicating with the mounting cavity 14. The valve seat 3 and the inner wall of the valve body 1 are also provided with a flow channel 20. The mounting hole 19 communicates with the flow channel 101 through the flow channel 20. One end of the push rod 15 is inserted into the mounting hole 19, and the other end abuts against the piston rod 18. A first seal is also provided between the push rod 15 and the mounting hole 19. In circle 21, the piston chamber 16 is welded to the outer wall of the valve body 1 and is covered by the piston rod 18 and the push rod 15. The piston body 17 seals and divides the piston chamber 16 into a pressure chamber 22 and a normal pressure chamber 23. The piston chamber 16 has a pressure-boosting hole 24 communicating with the outside at one end corresponding to the pressure-boosting chamber 22. When the pressure in the flow channel 101 inside the valve body 1 is greater than that outside, the piston rod 18 blocks the pressure-boosting hole 24. When the pressure outside the valve body 1 is greater than that in the flow channel 101, the piston rod 18 opens the pressure-boosting hole 24. At the same time, the piston rod 18 drives the push rod 15 to push the floating seat 12 towards the valve seat 3.

[0029] The beneficial effects of this design are as follows: By setting up a piston chamber and a pressure boosting orifice, the piston rod is automatically opened and closed using the internal and external pressure difference. When the external pressure of the seawater is greater than the internal pressure of the flow channel, the pressure boosting orifice automatically opens to introduce high-pressure seawater. No external power or electrical control is required, achieving purely mechanical pressure adaptive compensation with high reliability. The piston rod is directly transmitted to the floating seat through the contact between the push rod and the piston rod. The structure is compact and has high transmission efficiency, ensuring that the external pressure can be quickly converted into the compensating displacement of the valve seat, resulting in sensitive dynamic response. The pressure boosting chamber is directly connected to the seawater through the pressure boosting orifice, while the normal pressure chamber can be maintained at a low pressure by pre-filling with hydraulic oil. The pressure difference between the two provides driving force for the piston movement. At the same time, a first sealing ring is set between the push rod and the mounting hole to effectively isolate the seawater from the medium and avoid internal and external leakage. The design of the flow channel connects the mounting hole and the flow channel, cleverly utilizing the internal space of the valve body to balance the pressure. No additional pressure tapping pipe is required, reducing external interfaces and lowering the risk of leakage.

[0030] Furthermore, the inner edge of the mounting hole 19 has a protrusion 25 that abuts against the floating seat 12, and the end of the floating seat 12 extends into the mounting hole 19 with an inclined portion 26. The push rod 15 pushes the floating seat 12 toward the valve seat 3 through the inclined portion 26.

[0031] The beneficial effects of this design are as follows: by setting a boss that abuts against the floating seat, an accurate initial installation position is provided for the floating seat, ensuring that the elastic compensation component has a reasonable pre-compression amount, avoiding excessive displacement of the floating seat that could lead to sealing structure failure; the push rod pushes the floating seat through the inclined part, converting radial movement into axial movement, ensuring that the end face of the floating seat is parallel and in contact with the end face of the valve seat, avoiding poor sealing caused by off-center loading; the push rod can smoothly push the floating seat, avoiding jamming or component damage caused by rigid impact, and improving the smoothness of linkage in the deep-sea high-pressure environment.

[0032] Further, a floating gap 27 is formed between the floating seat 12 and the valve seat 3 through an elastic compensation component. The elastic compensation component includes a spring body 28 and a spring seat 29. The valve seat 3 is provided with a spring cavity 30. The spring seat 29 is threadedly connected to the floating seat 12. One end of the spring body 28 is sleeved on the spring seat 29 and the other end is embedded in the spring cavity 30. A second sealing ring 31 is provided between the floating seat 12 and the valve seat 3.

[0033] The beneficial effects of this design are as follows: a floating gap is formed between the floating seat and the valve seat through the elastic compensation component, so that the valve seat can maintain a tight fit with the ball and also have axial floating capability to adapt to dimensional changes caused by pressure fluctuations and temperature changes, avoiding jamming or excessive wear. The spring body adopts a compression spring with existing technology. The compression spring has a double limiting structure with one end sleeved on the spring seat and the other end embedded in the spring cavity, which effectively prevents the compression spring from radially twisting or deflecting during compression and rebound, ensuring that the spring force direction is always perpendicular to the sealing surface and extending fatigue life. A second sealing ring is set between the floating seat and the valve seat to improve sealing performance.

[0034] Furthermore, the valve seat 3 near the ball 2 abuts against a limiting block 32, and an elastic buffer block 33 is sandwiched between the limiting block 32 and the valve seat 3. The limiting block 32 is fixedly connected to the inner wall of the valve body 1 by a fastener 34. A guide rod 35 is threadedly connected to the inner wall of the valve body 1. The valve seat 3 away from the ball 2 is provided with a guide hole 36 for insertion into the guide rod 35. A third sealing ring 37 is also provided between the valve seat 3 and the valve body 1.

[0035] The beneficial effects of this design are as follows: the limiting block is used to limit the position of the valve seat closest to the ball, preventing the valve seat from jamming with the ball due to excessive pressure compensation; an elastic buffer block is sandwiched between the limiting block and the valve seat, which plays a buffering and energy absorption role when the valve seat moves to the limit position, avoiding damage caused by rigid collision between the valve seat and the limiting block, while allowing a small amount of overtravel to compensate for manufacturing tolerances; the insertion and cooperation of the guide rod and the guide hole provides a stable guiding path for the floating of the valve seat, ensuring that the valve seat always moves smoothly along the axis under the action of the pressure compensation component, avoiding local overload or jamming of the sealing surface caused by skew; and the third sealing ring increases the sealing performance at the valve seat.

[0036] Further configuration: the first pressure balancing assembly 8 includes a first housing 38, a first elastic rubber bladder 39, and a first end cap 40 that engages with the first housing 38. The first housing 38 has a first dynamic balancing cavity 41 for accommodating the drive mechanism 5. The first end cap 40 has a plurality of first filter guide holes 42 and a first seawater compensation cavity 43 inside the first end cap 40. The first elastic rubber bladder 39 is sandwiched between the first end cap 40 and the first housing 38 to separate the first seawater compensation cavity 43 from the first dynamic balancing cavity 41.

[0037] The beneficial effects of this design are as follows: the first elastic rubber bladder separates the first seawater compensation chamber from the first dynamic balance chamber. While isolating the seawater from direct contact with the drive mechanism, the seawater enters the first seawater compensation chamber through the first filter guide hole and squeezes the first elastic rubber bladder. The elastic deformation of the bladder transmits pressure. The first dynamic balance chamber is also pre-filled with hydraulic oil. Under the deformation and compression of the bladder, the volume of the first dynamic balance chamber changes, and the pressure of the hydraulic oil rises. This ensures that the pressure in the first dynamic balance chamber always follows the changes in external seawater pressure, avoiding the drive mechanism from bearing additional pressure differential, eliminating the problem of increased operating torque caused by deep-sea high pressure, ensuring flexible and reliable valve opening and closing, and preventing the intrusion of seawater impurities.

[0038] Further, the emergency grease injection port 10 is connected to an electric grease injection device 44. The second pressure balancing assembly 11 includes a second housing 45, a second elastic rubber bladder 46, and a second end cap 47 that is fastened to the second housing 45. The second housing 45 has a second dynamic balancing chamber 48 inside which the electric grease injection device 44 is accommodated. The second end cap 47 has a plurality of second filter guide holes 49, and the second end cap 47 has a second seawater compensation chamber 50 inside. The second elastic rubber bladder 46 is sandwiched between the second end cap 47 and the second housing 45 to separate the second seawater compensation chamber 50 from the second dynamic balancing chamber 48.

[0039] The beneficial effects of this design are as follows: the principle of the second pressure balancing component is the same as that of the first pressure balancing component. The second pressure balancing component creates a normal pressure working environment for the electric grease injection device, eliminating the additional load of deep-sea hydrostatic pressure on moving parts such as the grease injection motor and plunger, and ensuring that it can start quickly and reach the rated grease injection pressure when emergency grease injection is needed.

[0040] Furthermore, a shaped sealing ring 51 is sandwiched between the valve cover 6 and the valve body 1. The shaped sealing ring 51 has an opening 52 at one end corresponding to the gap between the valve cover 6 and the valve body 1, and the other end of the shaped sealing ring 51 has an inward portion 53.

[0041] The beneficial effects of this design are as follows: the opening at one end of the irregularly shaped sealing ring forms a pressure-capturing groove facing the medium side after installation. When the pressure of the medium inside the valve increases, the pressure medium enters the opening and expands the lip of the sealing ring, making the sealing ring fit more tightly with the valve body and valve cover, achieving a self-tightening seal with better sealing effect as the pressure increases. The inward portion at the other end forms an initial line contact with the bottom surface of the sealing groove in the pre-tightened state, providing a reliable pre-seal. When pressure is applied from the other side (such as external seawater), the inward portion deforms and opens to both sides, achieving a bidirectional sealing function and ensuring stable sealing in deep-sea working environments.

[0042] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

Claims

1. A top-mounted ball valve equipped with a deep-sea pressure compensation and emergency grease injection interface, comprising a valve body (1), a ball (2), a valve seat (3), a valve stem (4), and a drive mechanism (5), wherein the valve body (1) is also connected to a valve cover (6), the ball (2) is sealed and fitted with the valve seat (3) inside the valve body (1), one end of the valve stem (4) is connected to the ball (2), and the other end passes through the valve cover (6) and is connected to the drive mechanism (5), wherein the drive mechanism (5) drives the ball (2) to rotate through the valve stem (4) to control the opening and closing of the flow channel (101), characterized in that: The valve seat (3) is provided with a pressure compensation component (7) on the side away from the ball (2). The pressure compensation component (7) drives the valve seat (3) to press against the ball (2) by communicating with seawater outside the valve body (1). The drive mechanism (5) is equipped with a first pressure balancing component (8) on its outer side. The valve seat (3) is also provided with a grease injection channel (9) extending to the ball (2). The valve body (1) is also provided with an emergency grease injection port (10) communicating with the grease injection channel (9). The emergency grease injection port (10) is equipped with a second pressure balancing component (11) on its outer side. The pressure compensation component (7) also controls the opening and closing of the grease injection channel (9).

2. The top-mounted ball valve equipped with deep-sea pressure compensation and emergency grease injection interface according to claim 1, characterized in that: A floating seat (12) and an elastic compensation component are provided between the valve seat (3) and the valve body (1). The floating seat (12) has a transition channel (13) for connecting the emergency grease injection port (10) and the grease injection channel (9). The elastic compensation component pushes the valve seat (3) to squeeze towards the ball (2). At the same time, the transition channel (13) and the grease injection channel (9) are staggered and blocked. When the valve seat (3) squeezes the elastic compensation component to abut against the floating seat (12), the emergency grease injection port (10) is connected to the grease injection channel (9) through the transition channel (13).

3. The top-mounted ball valve equipped with deep-sea pressure compensation and emergency grease injection interface according to claim 2, characterized in that: The pressure compensation component (7) is located at the end of the floating seat (12) away from the valve seat (3), and the pressure compensation component (7) is used to control the floating seat (12) to move closer to or away from the valve seat (3). When the elastic compensation component fails or when the pressure compensation component (7) controls the floating seat (12) to abut against the valve seat (3), the emergency grease injection port (10) is connected to the grease injection channel (9) through the transition channel (13).

4. The top-mounted ball valve equipped with deep-sea pressure compensation and emergency grease injection interface according to claim 3, characterized in that: The valve body (1) is provided with an installation cavity (14) for mounting the floating seat (12) and the valve seat (3). The pressure compensation assembly (7) includes a push rod (15), a piston chamber (16), a piston body (17), and a piston rod (18) passing through the piston body (17). The side wall of the valve body (1) is also provided with an installation hole (19) communicating with the installation cavity (14). The valve seat (3) and the inner wall of the valve body (1) are also provided with a flow passage (20). The installation hole (19) is connected to the flow channel (101) through the flow passage (20). One end of the push rod (15) is inserted into the installation hole (19), and the other end abuts against the piston rod (18). A first sealing ring (2) is also provided between the push rod (15) and the installation hole (19). 1) The piston chamber (16) is welded to the outer wall of the valve body (1) and is covered by the piston rod (18) and the push rod (15). The piston body (17) seals and divides the piston chamber (16) into a pressure chamber (22) and a normal pressure chamber (23). The piston chamber (16) has a pressure hole (24) connected to the outside at one end corresponding to the pressure chamber (22). When the pressure in the flow channel (101) inside the valve body (1) is greater than that outside, the piston rod (18) blocks the pressure hole (24). When the pressure outside the valve body (1) is greater than that in the flow channel (101), the piston rod (18) opens the pressure hole (24). At the same time, the piston rod (18) drives the push rod (15) to push the floating seat (12) to move towards the valve seat (3).

5. A top-mounted ball valve equipped with a deep-sea pressure compensation and emergency grease injection interface according to claim 4, characterized in that: The inner edge of the mounting hole (19) has a protrusion (25) that abuts against the floating seat (12). The end of the floating seat (12) extends into the mounting hole (19) with an inclined portion (26). The push rod (15) pushes the floating seat (12) toward the valve seat (3) through the inclined portion (26).

6. A top-mounted ball valve equipped with a deep-sea pressure compensation and emergency grease injection interface according to claim 2, characterized in that: A floating gap (27) is formed between the floating seat (12) and the valve seat (3) through an elastic compensation component. The elastic compensation component includes a spring body (28) and a spring seat (29). The valve seat (3) is provided with a spring cavity (30). The spring seat (29) is threadedly connected to the floating seat (12). One end of the spring body (28) is sleeved on the spring seat (29) and the other end is embedded in the spring cavity (30). A second sealing ring (31) is provided between the floating seat (12) and the valve seat (3).

7. A top-mounted ball valve equipped with a deep-sea pressure compensation and emergency grease injection interface according to claim 1, characterized in that: The valve seat (3) near the ball (2) is also in contact with a limiting block (32). An elastic buffer block (33) is also sandwiched between the limiting block (32) and the valve seat (3). The limiting block (32) is fixedly connected to the inner wall of the valve body (1) by a fastener (34). A guide rod (35) is also threadedly connected to the inner wall of the valve body (1). The valve seat (3) away from the ball (2) is provided with a guide hole (36) for inserting into the guide rod (35). A third sealing ring (37) is also provided between the valve seat (3) and the valve body (1).

8. A top-mounted ball valve equipped with a deep-sea pressure compensation and emergency grease injection interface according to claim 1, characterized in that: The first pressure balancing assembly (8) includes a first housing (38), a first elastic rubber bladder (39), and a first end cap (40) that is fastened to the first housing (38). The first housing (38) has a first dynamic balancing cavity (41) inside for the drive mechanism (5) to be accommodated. The first end cap (40) has a plurality of first filter guide holes (42) and a first seawater compensation cavity (43) inside the first end cap (40). The first elastic rubber bladder (39) is sandwiched between the first end cap (40) and the first housing (38) to separate the first seawater compensation cavity (43) from the first dynamic balancing cavity (41).

9. A top-mounted ball valve equipped with a deep-sea pressure compensation and emergency grease injection interface according to claim 1, characterized in that: The emergency grease injection port (10) is connected to an electric grease injection device (44). The second pressure balance component (11) includes a second housing (45), a second elastic rubber bladder (46), and a second end cap (47) that is fastened to the second housing (45). The second housing (45) has a second dynamic balance chamber (48) inside which the electric grease injection device (44) is accommodated. The second end cap (47) has a plurality of second filter guide holes (49) and a second seawater compensation chamber (50) inside. The second elastic rubber bladder (46) is sandwiched between the second end cap (47) and the second housing (45) to separate the second seawater compensation chamber (50) from the second dynamic balance chamber (48).

10. A top-mounted ball valve equipped with a deep-sea pressure compensation and emergency grease injection interface according to claim 1, characterized in that: A special-shaped sealing ring (51) is also sandwiched between the valve cover (6) and the valve body (1). The special-shaped sealing ring (51) has an opening (52) at one end corresponding to the gap between the valve cover (6) and the valve body (1), and the other end of the special-shaped sealing ring (51) has an inward portion (53).

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