A rotary gate valve

Abstract

The present application belongs to the technical field of valve, disclose a kind of rotary gate valve.The rotary gate valve includes gate valve body and drive mechanism, gate valve body includes valve body, valve cover, valve rod and valve seat cylinder, when gate valve body is closed, valve seat cylinder is in first working position, when gate valve body is opened, valve seat cylinder is rotated from first working position to second working position;Drive mechanism can drive valve rod to rotate.The rotary gate valve of the present application, not only can drive valve rod to rotate by external drive device, make valve seat cylinder switch between first working position and second working position quickly, to realize the quick opening and closing of rotary gate valve;Also can drive valve rod to rotate by drive mechanism, also can make valve seat cylinder switch between first working position and second working position, to increase the drive mode of opening and closing rotary gate valve, in the case of not being equipped with drive device and drive device not having operating condition etc., ensure the normal work of rotary gate valve, improve the reliability of rotary gate valve work.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valves, in particular to a rotary gate valve. BACKGROUND

[0002] The existing gate valve is mostly of the rotary lifting rod type, that is, a hand wheel is rotated to drive the gate to move in a straight line. The gate valve needs to be rotated for several turns to open and close, and the opening and closing is relatively slow. Therefore, the existing patent CN116221439A discloses a rotary gate valve. The rotary gate valve comprises a valve body, a valve cover, a valve stem penetrating through the valve cover, and a valve seat assembly arranged at the lower end of the valve stem. A flow channel is formed in the valve body. The valve stem is used to drive the valve seat assembly to rotate. The valve seat assembly comprises a support seat, a channel and a groove formed in the support seat, and a valve seat arranged in the groove. The rotation of the valve stem can drive the support seat to rotate, so that the channel in the support seat and the flow channel in the valve body are mutually penetrated or staggered, so as to realize the opening and closing of the valve.

[0003] The above-mentioned rotary gate valve can complete the opening and closing of the gate valve by rotating 90°. However, the rotation of the valve stem needs to be driven by an external driving device, which leads to the single driving mode of the rotary gate valve. The rotary gate valve cannot work normally in the case where the driving device is not equipped or the driving device does not have working conditions, which affects the stability of the rotary gate valve. SUMMARY

[0004] The purpose of the present application is to provide a rotary gate valve which can realize the opening and closing of the gate valve by various modes, so as to cope with the case where the driving device is not equipped or the driving device does not have working conditions, thereby improving the stability of the rotary gate valve.

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

[0006] A rotary gate valve comprises a gate valve body, the gate valve body comprises a valve body, a valve cover, a valve stem and a valve seat cylinder, the valve cover is arranged on the valve body, the valve body and the valve cover have a cavity therebetween, the valve seat cylinder is arranged inside the cavity, and the valve stem penetrates through the valve cover and is connected with the valve seat cylinder; when the gate valve body is closed, the valve seat cylinder is in a first working position, when the gate valve body is opened, the valve seat cylinder is rotated from the first working position to a second working position, and the rotary gate valve further comprises a driving mechanism, the driving mechanism comprises:

[0007] a driving cylinder, which is arranged on the side of the valve cover away from the valve body, and the valve stem extends out of the driving cylinder;

[0008] a sliding member arranged inside the driving cylinder body along an axial direction parallel to the valve rod, the sliding member being capable of sliding from a third working position to a fourth working position; and

[0009] a transmission assembly connected between the sliding member and the valve rod, the transmission assembly being capable of driving the valve seat cylinder to switch between the first working position and the second working position when the sliding member slides between the third working position and the fourth working position.

[0010] Preferably, the inside of the driving cylinder body is provided with a first sealing cavity and a second sealing cavity along an axial direction thereof;

[0011] The sliding member comprises:

[0012] a first ring portion, an outer ring of the first ring portion being slidingly connected to an inner wall of the first sealing cavity, the first ring portion and the first sealing cavity being in sealing fit; and

[0013] a second ring portion, an outer diameter of the second ring portion being greater than or smaller than an outer diameter of the first ring portion, an outer ring of the second ring portion being slidingly connected to an inner wall of the second sealing cavity, the second ring portion and the second sealing cavity being in sealing fit;

[0014] an outer ring of the sliding member and an inner wall of the driving cylinder body being in fit to form a driving cavity with variable volume, a medium passage being formed on the driving cylinder body and being in communication with the driving cavity, the sliding member being capable of being driven to slide when a medium is filled into or extracted from the inside of the driving cavity.

[0015] Preferably, the sliding member further comprises:

[0016] a mounting seat, the mounting seat being located at an end of the first ring portion away from the second ring portion, a first elastic member being arranged between the mounting seat and the driving cylinder body, the first elastic member being capable of resetting the sliding member in the fourth working position to the third working position.

[0017] Preferably, the first elastic member is a reset spring, a bearing being arranged between the mounting seat and the reset spring, an end of the reset spring close to the mounting seat being capable of rotating relative to the mounting seat.

[0018] Preferably, one of the second ring portion and the driving cylinder body is provided with a guide groove along a sliding direction parallel to the first ring portion, the other of the second ring portion and the driving cylinder body being connected with a guide member, the guide member being in plug fit with the guide groove and being capable of sliding along a length direction of the guide groove relative to the guide groove.

[0019] As preferred, the transmission assembly comprises:

[0020] A transmission ring coaxially arranged with the valve rod, the transmission ring being provided with a spiral groove;

[0021] A transmission member inserted into the spiral groove; one of the transmission ring and the transmission member is connected to the valve rod, and the other is connected to the sliding member.

[0022] As preferred, a plurality of spiral grooves are provided along the circumference of the transmission ring, and the transmission member is provided with one corresponding to each spiral groove.

[0023] As preferred, the outer part of the driving cylinder is provided with a convex ring, and the rotary gate valve further comprises:

[0024] An outer shell located on the side of the medium channel away from the valve body, the outer shell being covered on the outer part of the driving cylinder and sealingly matched with the outer ring of the convex ring, and the valve rod extending out of the outer shell.

[0025] As preferred, the outer shell is provided with a driving panel on the side away from the valve body, and a driving head is rotatably arranged on the driving panel and coaxially connected to the valve rod.

[0026] As preferred, a second elastic member is arranged between the valve rod and the valve cover, and the second elastic member can apply an elastic force away from the valve cover to the valve rod.

[0027] The beneficial effects of the present application are:

[0028] The rotary gate valve of the present application not only can directly drive the valve rod to rotate by the external driving device to quickly switch the valve seat cylinder between the first working position and the second working position, but also can drive the valve rod to synchronously rotate by the transmission assembly through the sliding sliding member to switch the valve seat cylinder between the first working position and the second working position, thereby increasing the driving mode of opening and closing the rotary gate valve to ensure the normal work of the rotary gate valve in the case that the driving device is not equipped or the driving device does not have working conditions, and improving the reliability of the work of the rotary gate valve. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a sectional view of the rotary gate valve of the present application along the radial direction of the valve rod;

[0030] Figure 2 is Figure 1 one of the enlarged views of the partial part;

[0031] Figure 3 is Figure 1 the second enlarged view of the partial part;

[0032] Figure 4 This is a partial schematic diagram of the valve stem of the present invention;

[0033] Figure 5 This is a schematic diagram of the transmission ring structure of the present invention;

[0034] Figure 6 This is a top view of the rotary gate valve of the present invention.

[0035] In the picture:

[0036] 1. Valve body; 11. Flow channel; 2. Valve cover; 21. Cavity; 3. Valve stem; 31. Crimping ring; 311. Boss; 4. Valve seat; 42. Mounting groove; 43. Valve seat; 44. Sealing elastic element; 5. Drive cylinder; 51. First sealing cavity; 52. Second sealing cavity; 53. Connecting ring; 54. Guide element; 55. Medium passage; 56. Drive cavity; 57. Protruding ring; 58. Pressure ring; 6. Sliding element; 61. First ring portion; 62. Second ring; 621, guide groove; 622, contact surface; 63, mounting base; 631, thrust bearing; 7, transmission assembly; 71, transmission ring; 711, spiral groove; 712, groove; 72, transmission component; 8, outer shell; 81, ring shell; 82, end cap; 91, first elastic element; 92, second elastic element; 10, drive panel; 101, open indicator; 102, closed indicator; 103, drive head; 1031, indicator arrow. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0038] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0039] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0040] In the description of this embodiment, the terms "upper," "lower," "right," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. In addition, the terms "first" and "second" are used only for distinction in description and have no special meaning.

[0041] The following reference Figures 1 to 6 The rotary gate valve provided by the present invention will be described.

[0042] Reference Figure 1 and Figure 2 The rotary gate valve includes a gate valve body and a drive mechanism. The gate valve body includes a valve body 1, a valve cover 2, a valve stem 3, and a valve seat 4. A cavity 21 is formed between the valve body 1 and the valve cover 2. Multiple flow channels 11 are formed on the valve body 1, communicating with the cavity 21. The valve seat 4 is located inside the cavity 21. One end of the valve stem 3 is connected to the valve seat 4. A channel is formed on the valve seat 4. The valve stem 3 can drive the valve seat 4 to rotate to a first working position that isolates the flow channels 11 and the cavity 21, and to a second working position that connects the flow channels 11 and the cavity 21 through the channel. The drive mechanism can drive the valve stem 3 to rotate.

[0043] Specifically, in this embodiment, the valve body 1 and valve cover 2 are arranged sequentially from bottom to top, and a metal sealing ring is provided at the connection between the valve body 1 and valve cover 2 to seal the connection. The following describes the rotary gate valve in detail based on this orientation. In other embodiments, the rotary gate valve may be arranged horizontally or tilted at a certain angle, the specific angle being unrestricted. In addition, the valve stem 3 in this embodiment is multi-segmented, that is, formed by connecting multiple coaxially arranged rods, the specific connection method being unrestricted. In other embodiments, the valve stem 3 may also be arranged as a single unit.

[0044] For example, in this embodiment, two flow channels 11 are opened at the bottom of the valve body 1, and the flow channels 11 are L-shaped. The two ends of the flow channels 11 are respectively connected to the cavity 21 and the outside of the valve body 1. The valve seat cylinder 4 is horizontally arranged and cylindrical. A channel (not shown in the figure) is provided on the valve seat cylinder 4 corresponding to each flow channel 11, that is, two channels are arranged radially along the valve seat cylinder 4. In order to improve the sealing effect of the flow channels 11, two mounting grooves 42 are also opened radially at the bottom of the valve seat cylinder 4. The mounting grooves 42 are stepped grooves with a larger outer diameter and a smaller inner diameter. The distribution direction of the two mounting grooves 42 is perpendicular to the distribution direction of the two channels. A valve seat 43 is provided inside each mounting groove 42, and a sealing elastic element 44 abuts between the valve seat 43 and the bottom of the mounting groove 42. In this embodiment, the sealing elastic element 44 is a spring.

[0045] Based on the above settings, when the valve seat 4 is in the first working position (refer to...) Figure 1 At this time, the rotary gate valve is in the closed state, and the two flow channels 11 are blocked by the two valve seats 43 respectively, thereby reducing the possibility of leakage at the valve seats 43 and the flow channels 11. When the valve stem 3 is rotated by a tool or drive until the valve seat cylinder 4 rotates to the second working position, that is, after the valve seat cylinder 4 rotates 90°, the rotary gate valve is in the open state, and the two flow channels 11 are connected to the cavity 21 through the two channels.

[0046] It is worth noting that in some other embodiments, a gate valve body with the flow channel 11 perpendicular to the valve stem 3 axis and the valve plate vertically arranged can also be used. That is, the specific form and specifications of the gate valve body can be adapted to the situation.

[0047] Reference Figure 2 and Figure 3 The drive mechanism includes a drive cylinder 5, a sliding member 6, and a transmission assembly 7. The drive cylinder 5 is vertically arranged, and the sliding member 6 is slidably arranged inside the drive cylinder 5 along an axis parallel to the valve stem 3. The sliding member 6 can slide from a third working position to a fourth working position. The transmission assembly 7 is connected between the drive member and the valve stem 3. The transmission assembly 7 enables the valve seat 4 to switch between a first working position and a second working position when the sliding member 6 slides between the third working position and the fourth working position.

[0048] For example, in this embodiment, the bottom of the drive cylinder 5 is connected to a connecting ring 53, which is detachably connected to the valve cover 2 by screws. The interior of the drive cylinder 5 has a first sealing cavity 51 and a second sealing cavity 52 arranged sequentially along its axial direction. The first sealing cavity 51 and the second sealing cavity 52 are arranged sequentially from bottom to top and are connected. A medium channel 55 is opened on the drive cylinder 5, which is connected to the junction of the first sealing cavity 51 and the second sealing cavity 52.

[0049] Furthermore, the sliding member 6 includes a first ring portion 61, a second ring portion 62, and a mounting base 63, which are arranged sequentially from bottom to top. The inner diameter of the first ring portion 61 is the same as the inner diameter of the second ring portion 62, and the outer diameter of the first ring portion 61 is larger than the outer diameter of the second ring portion 62. The diameter at the connection between the first ring portion 61 and the second ring portion 62 gradually increases from top to bottom, forming an annular contact surface 622 at the connection between the first ring portion 61 and the second ring portion 62, and the contact surface 622 is inclined. The first ring portion 61 is slidably connected to the inner wall of the first sealing cavity 51, and the second ring portion 62 is slidably connected to the inner wall of the second sealing cavity 52, thereby forming a variable-volume driving cavity 56 between the sliding member 6 and the driving cylinder 5, and the medium channel 55 communicates with the driving cavity 56.

[0050] Based on the above, in this embodiment, when the slider 6 is at its highest position, it is the third working position of the slider 6 (refer to...). Figure 3 At this time, the contact surface 622 is directly opposite the medium channel 55. When the medium is filled into the drive cavity 56, the pressure of the medium will push the first ring 61 downward until the slider 6 reaches the fourth working position. When the medium inside the drive cavity 56 is pulled out, the slider 6 can move upward to the third working position, thereby realizing the sliding of the slider 6 through the input and output of the medium.

[0051] It should be noted that in some other embodiments, the outer diameter of the second ring 62 may be larger than the outer diameter of the first ring 61, and the bottom position of the slider 6 may be the third working position, so that after the medium is filled into the drive cavity 56, the slider 6 can slide upward to the fourth working position.

[0052] For example, in this embodiment, hydraulic oil is used as the medium. An oil tank and an oil pump are provided on one side of the drive cylinder 5 to drive the sliding member 6 to slide. In other embodiments, the medium can also be a control fluid, and the sliding member 6 can be slid by filling and extracting the control fluid into the drive cavity 56; the medium can also be compressed air, and the sliding member 6 can be slid by filling and deflating the drive cavity 56.

[0053] In addition, in order to ensure the sealing effect of the drive cavity 56, sealing rings are provided on the inner ring of the drive cylinder 5 and the outer ring of the second ring 62 to ensure the sealing effect between the first ring 61 and the first sealing cavity 51 and the sealing effect between the second ring 62 and the second sealing cavity 52.

[0054] Reference Figure 3The rotary gate valve also includes a housing 8, which comprises an annular shell 81 and an end cap 82 arranged sequentially from bottom to top. A convex ring 57 is connected to the outer wall of the drive cylinder 5. The annular shell 81 is located above the medium passage 55, covering the outside of the drive cylinder 5 and sealingly engaging with the outer ring of the convex ring 57. The end cap 82 is connected to the top of the annular shell 81 and seals the top of the annular shell 81. The valve stem 3 rotates through the end cap 82. A bearing is provided at the connection between the valve stem 3 and the end cap 82 to reduce the rotational resistance of the valve stem 3. The upper part of the rotary gate valve is sealed by the housing 8 to prevent external substances from contacting the transmission assembly 7 and other components installed between the valve stem 3 and the housing 8.

[0055] To ensure that the sliding member 6 is accurately positioned in the third working position, the mounting base 63 is connected to the top of the second ring 62. A first elastic element 91 is provided between the mounting base 63 and the drive cylinder 5. In this embodiment, the first elastic element 91 is a return spring, which abuts against the mounting base 63 and the convex ring 57. When the top of the mounting base 63 abuts against the end cover 82, the return spring is still in a compressed state, that is, the return spring always applies an upward elastic force to the mounting base 63, so that the top of the mounting base 63 always abuts against the end cover 82. Ultimately, when the rotary gate valve is closed, the sliding member 6 is accurately positioned in the third working position, ensuring the stability of the rotary gate valve's operation. The return spring can also, after the sliding member 6 slides downward, use its own elastic force to drive the sliding member 6 back to the third working position.

[0056] It should be noted that in some other embodiments, the reset spring may also be fixedly connected between the mounting base 63 and the convex ring 57; in some other embodiments, the first elastic element 91 may also be a rubber column or other elastic component.

[0057] In addition, a bearing is provided between the mounting base 63 and the return spring. In this embodiment, the bearing is a thrust bearing 631. The axis of the thrust bearing 631 is vertically arranged. The top of the thrust bearing 631 is connected to the mounting base 63, and the bottom of the thrust bearing 631 is connected to the return spring. This allows the end of the return spring near the mounting base 63 to rotate relative to the mounting base 63. When the return spring is compressed and extended, it can counteract the horizontal torque, prevent the return spring from deforming due to torsion, and improve the stability of the return spring's operation.

[0058] In a further preferred embodiment, in order to enable the slider 6 to slide in a straight line and be accurately positioned in the fourth working position, one of the second ring portion 62 and the drive cylinder 5 is provided with a guide groove 621 along a sliding direction parallel to the first ring portion 61, and the other is connected with a guide member 54. The guide member 54 is inserted into the guide groove 621 and can slide relative to the guide groove 621 along the length direction of the guide groove 621.

[0059] In this specific embodiment, guide grooves 621 are formed on the outer ring of the second ring 62, and multiple guides are evenly formed along the circumference of the second ring 62. One guide member 54 is provided for each guide groove 621. In this embodiment, the guide member 54 is a guide block, which is slidably disposed inside the guide groove 621. All guide blocks are detachably connected to the drive cylinder 5 by screws, allowing for the replacement of excessively worn guide blocks, guide blocks of different specifications, or guide blocks of different materials. Thus, during the sliding process of the slider 6, the cooperation between the guide member 54 and the guide groove 621 guides and limits the slider 6, restricting its two extreme positions so that the slider 6 can be accurately positioned in the third and fourth working positions.

[0060] Reference Figure 3 , Figure 4 and Figure 5 The transmission assembly 7 includes a transmission ring 71 and a transmission component 72. The transmission ring 71 is coaxially arranged with the valve stem 3. A spiral groove 711 is formed on the transmission ring 71, and the transmission component 72 is inserted into the spiral groove 711. One of the transmission ring 71 and the transmission component 72 is connected to the valve stem 3, and the other is connected to the sliding component 6. Specifically, in this embodiment, a crimping ring 31 with a diameter larger than its body is provided in the middle section of the valve stem 3, and two positioning grooves are machined radially at the top of the crimping ring 31 to form a straight boss 311 at the top of the crimping ring 31. The transmission ring 71 is sleeved on the outside of the valve stem 3, and a straight groove 712 is formed at the bottom of the transmission ring 71. The boss 311 and the groove 712 are inserted and engaged to achieve circumferential positioning of the transmission ring 71, so that the transmission ring 71 can rotate synchronously with the valve stem 3.

[0061] It should be noted that in some other embodiments, the transmission ring 71 can also be fixedly connected to the outside of the valve stem 3 so that the transmission ring 71 and the valve stem 3 rotate synchronously; or the valve stem 3 and the transmission ring 71 can be simultaneously inserted through components such as pins or screws, so that the transmission ring 71 and the valve stem 3 can also rotate synchronously.

[0062] In this embodiment, the transmission component 72 is used as a positioning pin, and the positioning pin is connected to the mounting base 63. When the mounting base 63 slides, it drives the positioning pin to slide synchronously, so that the positioning pin pushes against the side wall of the spiral groove 711, thereby causing the transmission ring 71 to rotate, so as to drive the valve stem 3 to rotate synchronously, thereby realizing the opening and closing of the rotary gate valve.

[0063] Furthermore, multiple spiral grooves 711 are provided along the circumference of the transmission ring 71. In this embodiment, two are used as an example. The transmission component 72 is provided with one for each spiral groove 711 so that the transmission ring 71 is subjected to more uniform force and the operation is more stable.

[0064] Reference Figure 1 and Figure 6To enable the rotary gate valve of this embodiment to be suitable for underwater environments, a drive panel 10 is provided on the side of the housing 8 away from the valve body 1. A drive head 103 is rotatably mounted on the drive panel 10 and coaxially connected to the valve stem 3. In this embodiment, the drive panel 10 is an ROV panel capable of docking with an ROV (Remote Operated Vehicle), and the drive head 103 is a connecting sleeve capable of docking with an ROV. Thus, when the rotary gate valve is used in an underwater environment, the valve stem 3 is driven by the ROV to achieve the opening and closing of the rotary gate valve.

[0065] Additionally, the drive panel 10 is provided with an open indicator 101 and a close indicator 102, and the drive head 103 is provided with an indicator arrow 1031. When the valve stem 3 is in the first working position, the indicator arrow 1031 points to the close indicator 102. When the valve stem 3 is in the second working position, the indicator arrow 1031 points to the close indicator 102. Thus, the current state of the rotary gate valve can be identified according to the open indicator 101 and the close indicator 102.

[0066] In addition, a second elastic element 92 is provided between the valve stem 3 and the valve cover 2. The second elastic element 92 can apply a spring force to the valve stem 3 away from the valve cover 2. Specifically, the inner ring of the drive cylinder 5 is threadedly connected to a pressure ring 58. The second elastic element 92 is a spring, which is sleeved on the outside of the valve stem 3 and abuts against the pressure ring 58 and the crimping ring 31. The spring always applies an upward spring force to the crimping ring 31 (i.e., the valve stem 3) to counteract the water pressure on the valve stem 3, thereby helping to prevent the valve stem 3 from axially moving.

[0067] It is worth noting that in some other embodiments, the drive panel 10 may be replaced with a panel that is compatible with it in order to adapt to other environments.

[0068] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art will be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A rotary gate valve, comprising a gate valve body, the gate valve body comprising a valve body (1), a valve cover (2), a valve stem (3) and a valve seat cylinder (4), the valve cover (2) being arranged on the valve body (1), the valve body (1) and the valve cover (2) having a cavity (21) therebetween, the valve seat cylinder (4) being arranged inside the cavity (21), the valve stem (3) penetrating the valve cover (2) and being connected with the valve seat cylinder (4); when the gate valve body is closed, the valve seat cylinder (4) is in a first working position, when the gate valve body is opened, the valve seat cylinder (4) is rotated from the first working position to a second working position, characterized in that, The rotating gate valve further comprises a driving mechanism, the driving mechanism comprises: a driving cylinder (5) arranged on the side of the bonnet (2) away from the valve body (1), and the valve stem (3) extends out of the driving cylinder (5); a sliding piece (6) arranged inside the driving cylinder (5) and sliding along the axial direction of the valve stem (3), the sliding piece (6) can slide from the third working position to the fourth working position; and a transmission assembly (7) connected between the sliding piece (6) and the valve stem (3), the transmission assembly (7) can drive the valve seat cylinder (4) to switch between the first working position and the second working position when the sliding piece (6) slides between the third working position and the fourth working position.

2. A rotary gate valve according to claim 1, wherein The inside of the driving cylinder (5) is provided with a first sealing cavity (51) and a second sealing cavity (52) along the axial direction thereof; The sliding piece (6) comprises: a first ring portion (61) whose outer ring is slidingly connected to the inner wall of the first sealing cavity (51), and the first ring portion (61) and the first sealing cavity (51) are in sealing fit; and a second ring portion (62) whose outer diameter is greater than or smaller than the outer diameter of the first ring portion (61), the outer ring of the second ring portion (62) is slidingly connected to the inner wall of the second sealing cavity (52), and the second ring portion (62) and the second sealing cavity (52) are in sealing fit; The outer ring of the sliding piece (6) and the inner wall of the driving cylinder (5) form a driving cavity (56) with variable volume in fit, the driving cylinder (5) is provided with a medium channel (55) communicating with the driving cavity (56), and the sliding piece (6) can be driven to slide when the medium is filled into or extracted from the inside of the driving cavity (56).

3. The rotating gate valve according to claim 2, wherein The sliding piece (6) further comprises: a mounting seat (63) located at the end of the first ring portion (61) away from the second ring portion (62), a first elastic member (91) is arranged between the mounting seat (63) and the driving cylinder (5), and the first elastic member (91) can reset the sliding piece (6) in the fourth working position to the third working position.

4. A rotary gate valve according to claim 3, wherein The first elastic member (91) is a reset spring, a bearing is arranged between the mounting seat (63) and the reset spring, and the end of the reset spring close to the mounting seat (63) can rotate relative to the mounting seat (63).

5. A rotary gate valve according to claim 2, wherein One of the second ring part (62) and the driving cylinder (5) is provided with a guide groove (621) along the sliding direction of the first ring part (61), and the other of the second ring part (62) and the driving cylinder (5) is connected with a guide piece (54), the guide piece (54) is inserted into the guide groove (621) and can slide along the length direction of the guide groove (621) relative to the guide groove (621).

6. A rotary gate valve according to any one of claims 1-5, characterized in that The transmission assembly (7) comprises: A transmission ring (71) is coaxially arranged with the valve rod (3), and a spiral groove (711) is formed in the transmission ring (71); and A transmission piece (72) is inserted into the inside of the spiral groove (711); one of the transmission ring (71) and the transmission piece (72) is connected to the valve rod (3), and the other is connected to the sliding piece (6).

7. A rotary gate valve according to claim 6, wherein A plurality of spiral grooves (711) are formed along the circumference of the transmission ring (71), and the transmission piece (72) is provided with one corresponding to each spiral groove (711).

8. A rotary gate valve according to any one of claims 2-5, characterized in that The driving cylinder (5) is provided with a convex ring (57) on the outside, and the rotary gate valve further comprises: An outer shell (8) is located on the side of the medium channel (55) away from the valve body (1), the outer shell (8) is arranged on the outside of the driving cylinder (5) and sealingly cooperates with the outer ring of the convex ring (57), and the valve rod (3) extends out of the outer shell (8).

9. A rotary gate valve according to claim 8, wherein The outer shell (8) is provided with a driving panel (10) on the side away from the valve body (1), the driving panel (10) is rotatably provided with a driving head (103), and the driving head (103) is coaxially connected to the valve rod (3).

10. A rotary gate valve according to any one of claims 2-5, characterized in that A second elastic piece (92) is arranged between the valve rod (3) and the valve cover (2), and the second elastic piece (92) can apply an elastic force away from the valve cover (2) to the valve rod (3).

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