High-pressure gate valve

Abstract

The utility model belongs to the technical field of gate valves, and discloses a high-pressure gate valve. The high-pressure gate valve comprises a valve body, a gate plate and a pilot sealing assembly. Wherein the valve body is provided with a medium channel, the flashboard is arranged in the valve body in a sliding and penetrating mode, a cavity is formed in the flashboard, the flashboard is provided with a pilot gate and a conduction gate, the cavity is communicated with the pilot gate, the flashboard is provided with a first position and a second position relative to the valve body, and when the flashboard is located at the first position, the pilot gate conducts the medium channel in advance; when the gate plate slides from the first position to the second position, the breakover gate communicates with the medium channel, the circulation inner diameter of the pilot gate is smaller than that of the breakover gate, the pilot sealing assembly comprises a pilot valve plate and a buffer valve seat, the buffer valve seat is fixedly contained in the cavity and communicates with the pilot gate, and the pilot valve plate can slide relative to the buffer valve seat. Therefore, the pilot gate is blocked or conducted. According to the high-pressure gate valve, the opening torque can be reduced, and the sealing performance of the high-pressure gate valve is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gate valves, in particular to a high-pressure gate valve. Background Art

[0002] High-pressure gate valve is a common on-off valve in oil drilling equipment. It can usually withstand greater pressure. The diameter of this gate valve is relatively large. When the high-pressure gate valve is opened, the liquid pressure difference on both sides of the gate along the direction of liquid flow is large, which makes the friction between the gate and the valve seat larger when the high-pressure gate valve is opened, which in turn leads to a larger gate valve opening torque.

[0003] In the prior art, a pilot channel and a flow channel are typically provided on the gate. The valve stem passes through the gate and cooperates with the pilot channel and the flow channel to seal the flow of liquid in the high-pressure gate valve. When the high-pressure gate valve is opened, the valve stem rises, causing the pilot channel to open, allowing some liquid to flow through the pilot channel, and then the flow channel to open, increasing the flow rate of the liquid. By allowing some liquid to flow through the pilot channel, the pressure difference on both sides of the gate is reduced, thereby reducing the torque when the high-pressure gate valve is opened. However, when the high-pressure gate valve is repeatedly opened and closed, the channel within the gate and the valve stem within the channel will be repeatedly impacted by the liquid, causing damage to the gate and reducing the sealing performance of the high-pressure gate valve. Utility Model Content

[0004] The purpose of the utility model is to provide a high-pressure gate valve, which can reduce the opening torque, improve the protection of the gate plate, and improve the sealing performance of the high-pressure gate valve.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] High pressure gate valve, including:

[0007] A valve body, wherein the valve body is provided with a medium passage;

[0008] a gate plate, the gate plate being slidably disposed within the valve body, a cavity being formed within the gate plate, the gate plate being provided with a pilot gate port and a conducting gate port, the cavity being in communication with the pilot gate port, the gate plate having a first position and a second position relative to the valve body, when the gate plate is in the first position, the pilot gate port preliminarily conducts the medium passage, when the gate plate slides from the first position to the second position, the conducting gate port conducts the medium passage, and the flow inner diameter of the pilot gate port is smaller than the flow inner diameter of the conducting gate port;

[0009] The pilot sealing assembly includes a pilot valve plate and a buffer valve seat. The buffer valve seat is fixedly accommodated in the cavity and communicates with the pilot gate. The pilot valve plate can slide relative to the buffer valve seat to block or open the pilot gate.

[0010] Preferably, the buffer valve seat is provided with a cross-connected pilot channel and a sealing channel, the pilot channel is connected to the pilot gate, the pilot valve plate can slide in the sealing channel, and the pilot valve plate has a first state and a second state relative to the sealing channel. When the pilot valve plate is in the first state, the pilot valve plate is connected to the pilot channel, and when the pilot valve plate is in the second state, the pilot channel blocks the pilot channel.

[0011] Preferably, the pilot valve plate comprises a sealing portion and a sliding portion that are fixedly connected, and the sealing portion can extend into the sealing channel to block the pilot channel.

[0012] Preferably, the pilot seal assembly further comprises:

[0013] The valve core is fixedly inserted into the pilot gate and is blocked at the connection between the buffer valve seat and the cavity wall of the cavity.

[0014] Preferably, the buffer valve seat is made of metal material, and the outer surface of the buffer valve seat is wrapped with buffer material.

[0015] Preferably, the high-pressure gate valve further comprises:

[0016] A transmission assembly is fixedly connected to the pilot valve plate to drive the pilot valve plate to slide relative to the buffer valve seat, and the transmission assembly can abut against the gate plate to drive the gate plate to move between the first position and the second position.

[0017] Preferably, a first abutment surface and a second abutment surface arranged at intervals in the up and down directions are provided in the cavity of the gate plate, part of the transmission assembly is located in the cavity, the first abutment surface is located above the second abutment surface, the upper end surface of the transmission assembly can abut against the first abutment surface to drive the gate plate to slide to the second position, and the upper end surface of the transmission assembly can abut against the second abutment surface to drive the gate plate to slide to the first position.

[0018] Preferably, the transmission assembly comprises:

[0019] a valve stem nut located in the cavity, the valve stem nut being fixedly connected to the pilot valve plate, the upper end surface of the valve stem nut being capable of abutting against the first abutting surface, and the lower end surface of the valve stem nut being capable of abutting against the second abutting surface;

[0020] A valve stem, one end of which is inserted into the cavity and is threadedly connected to the valve stem nut.

[0021] Preferably, the high-pressure gate valve further comprises:

[0022] A rotary driving member, wherein an output end of the rotary driving member is in transmission connection with the valve stem, and the rotary driving member is configured to drive the valve stem to rotate.

[0023] Preferably, the high-pressure gate valve further comprises:

[0024] A valve seat is provided in the valve body, and the gate plate can pass through the valve seat and extend into the medium channel.

[0025] Beneficial effects of the utility model:

[0026] The utility model provides a high-pressure gate valve, which comprises a valve body, a gate plate and a pilot sealing assembly; wherein, the valve body is provided with a medium channel, the gate plate is slidably arranged in the valve body, a cavity is formed inside the gate plate, the gate plate is provided with a pilot gate port and a conducting gate port, the cavity is communicated with the pilot gate port, the gate plate has a first position and a second position relative to the valve body, when the gate plate is in the first position, the pilot gate port pre-conducts the medium channel, when the gate plate slides from the first position to the second position, the conducting gate port conducts the medium channel, the flow inner diameter of the pilot gate port is smaller than the flow inner diameter of the conducting gate port, the pilot sealing assembly comprises a pilot valve plate and a buffer valve seat, the buffer valve seat is fixedly accommodated in the cavity and is communicated with the pilot gate port, the pilot valve plate is arranged in the cavity, the pilot valve plate can slide relative to the buffer valve seat to block or conduct the pilot gate port.

[0027] The high-pressure gate valve provided by the utility model has a pilot gate port and a conducting gate port opened on the gate plate. When the high-pressure gate valve is opened, the gate plate is in the first position, and the pilot valve plate conducts the pilot gate port, so that the pilot gate port with a relatively small flow inner diameter conducts the medium channel in advance, and then the gate plate is slid from the first position to the second position, so that the conducting gate port with a relatively large flow inner diameter conducts the medium channel, ensuring that the medium can first flow through the pilot gate port with a smaller flow inner diameter, so that the opening torque of the first position of the gate plate is small. Since the medium passes through the pilot gate port to conduct the medium channel, there is medium on both sides of the gate plate at this time, so that the pressure difference on both sides of the gate plate is also reduced; when the gate plate is switched from the first position to the second position, the pressure difference on both sides of the gate plate is reduced, thereby reducing the opening torque of the high-pressure gate valve. In addition, the pilot valve plate and the buffer valve seat are both arranged in the cavity, the buffer valve seat is connected to the pilot gate port, and the pilot valve plate can slide relative to the buffer valve seat to block or open the pilot gate port, so that when the medium passes through the pilot gate port, the buffer valve seat replaces the channel inside the gate plate, avoiding damage to the gate plate after long-term impact by the medium, improving the protection of the gate plate, and thus improving the sealing of the high-pressure gate valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1This is a schematic diagram of the first structure of the high-pressure gate valve provided by an embodiment of the utility model;

[0029] Figure 2 This is a second structural diagram of the high-pressure gate valve provided by an embodiment of the utility model;

[0030] Figure 3 yes Figure 1 A partial enlarged view of the middle part;

[0031] Figure 4 yes Figure 2 A partial enlarged view of point B in the middle;

[0032] Figure 5 This is a third structural schematic diagram of the high-pressure gate valve provided by an embodiment of the utility model.

[0033] In the picture:

[0034] 1. Valve body; 11. Upper valve body; 12. Lower valve body; 13. Medium channel; 14. Limit pin;

[0035] 2. Gate; 21. Cavity; 22. Pilot gate; 23. Conducting gate; 24. First abutting surface; 25. Second abutting surface; 3. Pilot seal assembly; 31. Pilot valve plate; 311. Sealing portion; 312. Sliding portion; 32. Buffer valve seat; 321. Pilot passage; 322. Sealing passage; 33. Valve core;

[0036] 4. Valve seat; 5. Transmission assembly; 51. Valve stem nut; 52. Valve stem; 6. Rotary drive component. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0038] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0039] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0041] like Figure 1-Figure 3 As shown, this embodiment provides a high-pressure gate valve, which includes a valve body 1, a gate plate 2 and a pilot sealing assembly 3; wherein the valve body 1 is provided with a medium channel 13, the gate plate 2 is slidably arranged in the valve body 1, a cavity 21 is formed inside the gate plate 2, the gate plate 2 is provided with a pilot gate port 22 and a conducting gate port 23, the cavity 21 is communicated with the pilot gate port 22, the gate plate 2 has a first position and a second position relative to the valve body 1, when the gate plate 2 is in the first position, the pilot gate port 23 is opened, and the pilot gate port 22 is opened. 22 pre-opens the medium channel 13. When the gate plate 2 slides from the first position to the second position, the conducting gate port 23 opens the medium channel 13. The flow inner diameter of the pilot gate port 22 is smaller than the flow inner diameter of the conducting gate port 23. The pilot sealing assembly 3 includes a pilot valve plate 31 and a buffer valve seat 32. The buffer valve seat 32 is fixedly accommodated in the cavity 21 and communicates with the pilot gate port 22. The pilot valve plate 31 can slide relative to the buffer valve seat 32 to block or open the pilot gate port 22.

[0042] The high-pressure gate valve provided by the utility model is provided with a pilot gate port 22 and a conducting gate port 23 on the gate plate 2. When the high-pressure gate valve is opened, the gate plate 2 is in the first position, and the pilot valve plate 31 conducts the pilot gate port 22, so that the pilot gate port 22 with a relatively small flow inner diameter is pre-conducted to the medium channel 13, thereby causing the gate plate 2 to slide from the first position to the second position, so that the conducting gate port 23 with a relatively large flow inner diameter is connected to the medium channel 13, ensuring that the medium can first flow through the pilot gate port 22 with a smaller flow inner diameter, so that the opening torque of the first position of the gate plate 2 is small. Since the medium passes through the pilot gate port 22 to conduct the medium channel 13, there is medium on both sides of the gate plate 2 at this time, so that the pressure difference on both sides of the gate plate 2 is also reduced; when the gate plate 2 switches from the first position to the second position, since the pressure difference on both sides of the gate plate 2 is reduced, the torque for opening the high-pressure gate valve is reduced. In addition, the pilot valve plate 31 and the buffer valve seat 32 are both arranged in the cavity 21. The buffer valve seat 32 is connected to the pilot gate port 22. The pilot valve plate 31 can slide relative to the buffer valve seat 32 to block or open the pilot gate port 22, so that when the medium passes through the pilot gate port 22, the buffer valve seat 32 replaces the channel inside the gate plate 2, avoiding damage to the gate plate 2 after being impacted by the medium for a long time, improving the protection of the gate plate 2, and thus improving the sealing performance of the high-pressure gate valve.

[0043] Optional, such as Figure 1 、 Figure 2 and Figure 5 As shown, in this embodiment, when the gate 2 slides from the first position to the second position, the conducting gate 23 begins to conduct the medium channel 13, and the pilot gate 22 is in a conducting state; when the gate 2 is completely moved to the second position, the conducting gate 23 completely conducts the medium channel 13, and the pilot gate 22 is no longer in conduction with the medium channel 13.

[0044] It should be noted that, in this embodiment, the medium is petroleum, and in other embodiments, the medium may also be water or other liquids.

[0045] Alternatively, as Figure 1 and Figure 2 As shown, in this embodiment, the valve body 1 includes an upper valve body 11 and a lower valve body 12, which are detachably connected. The lower valve body 12 defines a medium passage 13, and the pilot seal assembly 3 is disposed within the lower valve body 12. This arrangement facilitates installation and maintenance of the valve body 1, as well as replacement of the pilot seal assembly 3. Specifically, the upper valve body 11 and the lower valve body 12 are detachably connected by bolts.

[0046] It should be noted that in this embodiment, the high-pressure gate valve further includes a limit pin 14. The upper valve body 11 defines a first mounting hole (not shown), and the lower valve body 12 defines a second mounting hole (not shown). The limit pin 14 can be inserted into both the first and second mounting holes. This arrangement limits the relative displacement between the upper valve body 11 and the lower valve body 12.

[0047] Alternatively, as Figure 3 As shown, in this embodiment, the buffer valve seat 32 is accommodated in the cavity 21 and is in close contact with the inner wall of the cavity 21. This arrangement ensures that the buffer valve seat 32 is firmly embedded in the cavity 21, ensuring that when the gate plate 2 is in the first position, the buffer valve seat 32 can maintain a precise and stable position in the cavity 21, thereby preventing the buffer valve seat 32 from shaking and causing the buffer function to fail.

[0048] Furthermore, if Figure 3 As shown, the buffer valve seat 32 is provided with a cross-connected pilot channel 321 and a sealing channel 322. The pilot channel 321 is connected to the pilot gate 22. The pilot valve plate 31 can slide in the sealing channel 322. The pilot valve plate 31 has a first state and a second state relative to the sealing channel 322. When the pilot valve plate 31 is in the first state, the pilot valve plate 31 is connected to the pilot channel 321. When the pilot valve plate 31 is in the second state, the pilot channel 321 is blocked. The pilot channel 321 is connected to the pilot gate 22, providing a path for the flow of oil. When the pilot valve plate 31 is in the first state, the pilot valve plate 31 connects the pilot channel 321. At this time, the oil can flow smoothly through the pilot channel 321, thereby reducing the pressure difference on both sides of the gate plate 2; in addition, the pilot valve plate 31 can slide in the sealing channel 322 to achieve flexible switching of the two states of the pilot valve plate 31 relative to the sealing channel 322. At the same time, the sealing channel 322 also plays the role of guiding the pilot valve plate 31, ensuring that the pilot valve plate 31 maintains a stable motion trajectory during the sliding process, avoiding problems such as sticking or offset.

[0049] Alternatively, as Figure 3 As shown, in this embodiment, the pilot channel 321 and the sealing channel 322 are connected perpendicularly. This allows oil to flow more smoothly through the pilot channel 321 and the sealing channel 322, avoiding unstable oil flow caused by a complex structure. In other embodiments, the pilot channel 321 and the sealing channel 322 are connected at an angle to ensure that the pilot valve plate 31 can block the pilot channel 321 when sliding within the sealing channel 322.

[0050] Furthermore, if Figure 3As shown, the pilot valve plate 31 includes a fixedly connected sealing portion 311 and a sliding portion 312. The sealing portion 311 can extend into the sealing channel 322 to block the pilot channel 321. The tight fit between the sealing portion 311 and the sealing channel 322 can prevent the oil in the pilot channel 321 from leaking when the pilot channel 321 is blocked. When the pilot valve plate 31 is in the first state, the sealing channel 322 is fully connected to the pilot channel 321. At this time, the sealing portion 311 is located in the sealing channel 322 and does not escape the confines of the sealing channel 322. Therefore, the sealing portion 311 is always located in the sealing channel 322, which can provide guidance for the sliding of the sealing portion 311 and improve the sealing stability of the pilot seal assembly 3.

[0051] Alternatively, as Figure 3 As shown, in this embodiment, the sliding portion 312 is slidably disposed within the cavity 21, and the outer wall of the sliding portion 312 is in contact with the inner wall of the gate plate 2. This arrangement can provide stable support and guidance for the sealing portion 311, allowing the sealing portion 311 to operate smoothly and accurately during the switching process between the first state and the second state, thereby preventing shaking or deviation from affecting the sealing effect.

[0052] Further, if Figure 3 As shown, the pilot seal assembly 3 also includes a valve core 33, which is fixedly installed in the pilot gate 22 and is located at the connection between the buffer valve seat 32 and the wall of the cavity 21. With this arrangement, the valve core 33 has the same sealing effect as the sealing ring, preventing oil from leaking through the gap between the gate plate 2 and the buffer valve seat 32.

[0053] Alternatively, as Figure 3 As shown, in this embodiment, the valve core 33 is fixedly disposed through the pilot gate 22 and is engaged within the buffer valve seat 32. This arrangement not only allows the valve core 33 to further stabilize the position of the buffer valve seat 32 within the cavity 21, preventing displacement or shaking of the buffer valve seat 32, thereby maintaining the stability and accuracy of the pilot seal assembly 3, but also connects the pilot gate 22 and the pilot channel 321 through the valve core 33, providing guidance for the flow of oil.

[0054] Alternatively, as Figure 3 As shown, in this embodiment, two valve cores 33 are provided, and the two valve cores 33 are fixedly penetrated through the pilot gates 22 on both sides of the gate plate 2 and are clamped in the buffer valve seat 32. The above arrangement makes the position of the buffer valve seat 32 in the cavity 21 more stable.

[0055] Furthermore, the buffer valve seat 32 is made of metal, and its outer surface is coated with a cushioning material. This arrangement not only ensures the overall structural strength of the buffer valve seat 32 but also allows it to partially absorb the oil pressure shock, reducing the pressure on the gate plate 2 when the pilot valve plate 31 is opened. This prevents damage to the internal metal structure of the gate plate 2 due to excessive oil shock, which could reduce the sealing effect of the high-pressure gate valve, and extends the service life of the buffer valve seat 32.

[0056] Optionally, in this embodiment, the buffer material is vulcanized rubber, which has higher elasticity, can better absorb the impact of oil pressure, and is easy to bond with metal materials. In other embodiments, the buffer material can also be silicone, etc., which is not limited here.

[0057] Further, if Figure 1-Figure 3 As shown, the high-pressure gate valve also includes a transmission assembly 5, which is fixedly connected to the sliding portion 312 of the pilot valve plate 31 to drive the sealing portion 311 of the pilot valve plate 31 to slide relative to the sealing channel 322 of the buffer valve seat 32. The transmission assembly 5 can abut against the gate plate 2 to drive the gate plate 2 to move between the first position and the second position.

[0058] After the unclamping of the two cams, the pilot valve 31 is in the state of being in a state of being pushed up and down, and the pilot valve 31 is in the state of being pushed up and down, and the pilot valve 31 is in the state of being pushed up and down, and the pilot valve 31 is in the state of being pushed up and down, and the pilot valve 31 is in the state of being pushed up and down. When the transmission assembly 5 has abutted against the gate plate 2, the transmission assembly 5 drives the gate plate 2 to slide vertically upward to the position where the conducting gate 23 and the medium channel 13 are just connected. This process continues until the gate plate 2 slides to the position where the conducting gate 23 and the medium channel 13 are completely connected. The above process is when the gate plate 2 is in the second position. When the transmission assembly 5 drives the sealing portion 311 to slide vertically downward to the position where the pilot channel 321 and the sealing channel 322 are completely blocked, the pilot valve plate 31 is in the second state. The transmission assembly 5 continues to drive the sealing portion 311 to slide vertically downward. When the transmission assembly 5 abuts against the gate plate 2, the transmission assembly 5 drives the gate plate 2 to slide vertically downward until the gate plate 2 switches from the second position to the first position. By having a single transmission assembly 5 drive the movement of the pilot valve plate 31 and the gate plate 2 at the same time, the transmission is stable and the transmission synchronization is guaranteed.

[0059] Further, if Figure 4 As shown, the cavity 21 of the gate plate 2 is provided with a first abutting surface 24 and a second abutting surface 25 spaced apart in the vertical direction. Part of the transmission assembly 5 is located in the cavity 21, with the first abutting surface 24 located above the second abutting surface 25. The upper end surface of the transmission assembly 5 can abut against the first abutting surface 24 to drive the gate plate 2 to slide to the second position, and the upper end surface of the transmission assembly 5 can abut against the second abutting surface 25 to drive the gate plate 2 to slide to the first position. The above arrangement enables the transmission assembly 5 to abut against the first abutting surface 24 or the second abutting surface 25, increasing the contact area and ensuring the stability of the transmission.

[0060] Further, if Figure 4 and Figure 5 As shown, the transmission assembly 5 includes a valve stem nut 51 and a valve stem 52, wherein the valve stem nut 51 is located in the cavity 21, the valve stem nut 51 is fixedly connected to the pilot valve plate 31, the upper end face of the valve stem nut 51 can abut against the first abutting face 24, the lower end face of the valve stem nut 51 can abut against the second abutting face 25, and one end of the valve stem 52 that penetrates into the cavity 21 is threadedly connected to the valve stem nut 51. When the valve stem 52 rotates, due to the threaded connection between the valve stem 52 and the valve stem nut 51, the valve stem 52 drives the valve stem nut 51 to move upward or downward within the cavity 21. When the valve stem 52 rotates and drives the valve stem nut 51 to move upward, the pilot valve plate 31 is in the first state. When the upper end surface of the valve stem nut 51 abuts against the first abutting surface 24, the valve stem nut 51 drives the gate plate 2 to move from the first position to the second position. When the valve stem 52 rotates and drives the valve stem nut 51 to move downward, the pilot valve plate 31 switches from the first state to the second state. When the lower end surface of the valve stem nut 51 abuts against the second abutting surface 25, the valve stem nut 51 drives the gate plate 2 to move from the second position to the first position. The arrangement of the valve stem nut 51 and the valve stem 52 simplifies the transmission of the transmission assembly 5 and ensures the reliability of the high-pressure gate valve.

[0061] Further, if Figure 5 As shown, the high-pressure gate valve further includes a rotary drive member 6, the output end of which is in transmission connection with the valve stem 52, and the rotary drive member 6 is configured to drive the valve stem 52 to rotate. With the above arrangement, the rotary drive member 6 can transmit power to the valve stem 52, realizing the rotation of the valve stem 52, thereby driving the valve stem nut 51 to rise and fall.

[0062] Further, if Figure 5As shown, the high-pressure gate valve further includes a valve seat 4, which is disposed in the valve body 1, and the gate plate 2 can pass through the valve seat 4 and extend into the medium channel 13. The above arrangement can provide precise guidance and positioning for the gate plate 2, so that the gate plate 2 can move smoothly along a predetermined trajectory during the opening and closing process. When the gate plate 2 switches from the second position to the first position, the gate plate 2 will, under the drive of the valve stem nut 51, accurately pass through the valve seat 4 and gradually extend into the medium channel 13, tightly fitting with the valve seat 4, thereby effectively blocking the flow of oil in the medium channel 13, achieving a reliable sealing effect, and preventing oil leakage.

[0063] Alternatively, as Figure 5 As shown, in this embodiment, the high-pressure gate valve further includes a second sealing ring (not shown in the figure), which is arranged between the valve seat 4 and the lower valve body 12. The above arrangement can seal the gap between the valve seat 4 and the lower valve body 12, preventing the oil in the medium channel 13 from leaking through the gap between the sealing valve seat 4 and the lower valve body 12.

[0064] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. High pressure gate valve, characterized in that, include: A valve body (1), wherein the valve body (1) is provided with a medium channel (13); a gate plate (2), the gate plate (2) being slidably arranged in the valve body (1), a cavity (21) being formed inside the gate plate (2), the gate plate (2) being provided with a pilot gate (22) and a conducting gate (23), the cavity (21) being communicated with the pilot gate (22), the gate plate (2) having a first position and a second position relative to the valve body (1), when the gate plate (2) is located at the first position, the pilot gate (22) pre-conducts the medium channel (13), when the gate plate (2) slides from the first position to the second position, the conducting gate (23) conducts the medium channel (13), and the flow inner diameter of the pilot gate (22) is smaller than the flow inner diameter of the conducting gate (23); A pilot sealing assembly (3), the pilot sealing assembly (3) comprising a pilot valve plate (31) and a buffer valve seat (32), the buffer valve seat (32) being fixedly accommodated in the cavity (21) and communicating with the pilot gate (22), the pilot valve plate (31) being able to slide relative to the buffer valve seat (32) to block or open the pilot gate (22).

2. The high-pressure gate valve according to claim 1, characterized in that: The buffer valve seat (32) is provided with a cross-connected pilot channel (321) and a sealing channel (322); the pilot channel (321) is connected to the pilot gate (22); the pilot valve plate (31) can slide in the sealing channel (322); the pilot valve plate (31) has a first state and a second state relative to the sealing channel (322); when the pilot valve plate (31) is in the first state, the pilot valve plate (31) is connected to the pilot channel (321); when the pilot valve plate (31) is in the second state, the pilot channel (321) blocks the pilot channel (321).

3. The high-pressure gate valve according to claim 2, characterized in that: The pilot valve plate (31) comprises a sealing portion (311) and a sliding portion (312) that are fixedly connected. The sealing portion (311) can extend into the sealing channel (322) to block the pilot channel (321).

4. The high-pressure gate valve according to claim 1, characterized in that: The pilot seal assembly (3) further comprises: A valve core (33) is fixedly inserted into the pilot gate (22), and the valve core (33) is blocked at the connection between the buffer valve seat (32) and the cavity wall of the cavity (21).

5. The high-pressure gate valve according to any one of claims 1 to 4, characterized in that: The buffer valve seat (32) is made of metal material, and the outer surface of the buffer valve seat (32) is wrapped with buffer material.

6. The high-pressure gate valve according to any one of claims 1 to 4, characterized in that: The high-pressure gate valve also includes: A transmission assembly (5) is fixedly connected to the pilot valve plate (31) to drive the pilot valve plate (31) to slide relative to the buffer valve seat (32); the transmission assembly (5) can abut against the gate plate (2) to drive the gate plate (2) to move between the first position and the second position.

7. The high-pressure gate valve according to claim 6, characterized in that: A first abutting surface (24) and a second abutting surface (25) spaced apart in the up-down direction are provided in the cavity (21) of the gate plate (2); part of the transmission assembly (5) is located in the cavity (21); the first abutting surface (24) is located above the second abutting surface (25); the upper end surface of the transmission assembly (5) can abut against the first abutting surface (24) to drive the gate plate (2) to slide to the second position; the upper end surface of the transmission assembly (5) can abut against the second abutting surface (25) to drive the gate plate (2) to slide to the first position.

8. The high-pressure gate valve according to claim 7, characterized in that: The transmission assembly (5) comprises: a valve stem nut (51) located in the cavity (21), the valve stem nut (51) being fixedly connected to the pilot valve plate (31), the upper end surface of the valve stem nut (51) being capable of abutting against the first abutting surface (24), and the lower end surface of the valve stem nut (51) being capable of abutting against the second abutting surface (25); A valve stem (52), one end of the valve stem (52) extending deep into the cavity (21) is threadedly connected to the valve stem nut (51).

9. The high-pressure gate valve according to claim 8, characterized in that: The high-pressure gate valve also includes: A rotary drive member (6), an output end of which is in transmission connection with the valve stem (52), and the rotary drive member (6) is configured to drive the valve stem (52) to rotate.

10. The high-pressure gate valve according to any one of claims 1 to 4, characterized in that: The high-pressure gate valve also includes: A valve seat (4) is provided in the valve body (1), and the gate plate (2) can pass through the valve seat (4) and extend into the medium channel (13).

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