Plug valve

Abstract

The present application relates to the technical field of drilling equipment, and discloses a plug valve, which includes a valve body, an upper valve seat, a valve ball, a lower valve seat and a valve ball opening mechanism arranged in the valve body. The valve ball is clamped between the upper valve seat and the lower valve seat. The lower valve seat includes a first lower valve seat and a second lower valve seat. The first lower valve seat is connected to the valve body, and the second lower valve seat is sleeved on the first lower valve seat. The upper valve seat, the valve ball and the second lower valve seat form a sealing pair in the valve body. A first opening is circumferentially arranged on the first lower valve seat, and a second opening is circumferentially arranged on the second lower valve seat. A spring is arranged at the bottom of the second lower valve seat, and the other end of the spring is connected to the first lower valve seat. The second lower valve seat can reciprocate relative to the first lower valve seat along its axial direction. When the plug valve of the present application is in use, it can not only reduce the opening torque of the valve, but also improve the sealing performance of the valve.

Description

Technical Field

[0001] This application relates to the technical field of oil drilling, especially drilling equipment, and specifically to a kind of plug valve. Background Technique

[0002] A plug valve is a quick-opening and closing straight-through valve. By rotating 90 degrees, the channel opening on the valve plug communicates with or separates from the channel opening on the valve body, thereby realizing the opening or closing of the valve. In the field of oil drilling, the plug valve is widely used in the drill string circulation system. It is a manually controlled valve that can play a role in high-pressure sealing.

[0003] When the existing plug valve is in use and in the closed state, due to the excessive liquid pressure, the liquid directly acts on the valve ball, resulting in a large opening torque of the valve. When workers open the valve, it is very laborious, and even the valve may not be able to be opened. Therefore, in order to reduce the opening torque of the valve, an elastic mechanism is set in the valve body to offset part of the liquid pressure, thereby reducing the opening torque of the valve and ensuring that the valve can be opened normally.

[0004] For example, the utility model patent with the publication number CN207033379U, publication date February 23, 2018, and invention name "A Circulable Drill String Plug Valve", its specific technical solution is as follows: The utility model discloses a circulable drill string plug valve. Through the valve ball opening device, the valve ball rotates to realize the opening or closing of the drilling fluid channel, that is, it can realize non-pressure-drop circulating drilling overflow check and blowout prevention, and cut off the drilling fluid in the kelly. Through the floating placement of the bearing spring and the lower valve seat, when the valve ball is closed, the pump can also be cycled and pressured at any time, and it is not affected by the pressure inside the drill string, effectively avoiding the occurrence of equipment damage and personal injury accidents caused by the operator accidentally turning on the pump when the existing plug valve's valve ball is closed, reducing the operation safety risk, greatly guaranteeing the safety of the operators, reducing the labor intensity, and having the characteristics of saving time and effort.

[0005] For another example, there is a patent application for an invention named "Closed Positive Circulation Plug Valve" with a publication number of CN113503374A and a publication date of October 15, 2021. Its specific technical solution is as follows: A closed positive circulation plug valve, belonging to the technical field of internal blowout preventers, solves the problem of frequent opening and closing of the plug valve during oilfield drilling operations. It includes a valve body, an upper valve seat, a ball valve, a lower valve seat, and a knob. The upper valve seat, the ball valve, and the lower valve seat are sequentially arranged in the valve body to form a sealing pair. The upper valve seat is fixedly connected to the valve body. The ball valve is clamped between the upper valve seat and the lower valve seat. A knob is provided on one side of the ball valve for rotating the ball valve. The ball valve and the knob are driven by the cooperation of a linear slider and a linear chute. When the ball valve is in the closed state, the direction of the linear chute is parallel to the axial direction of the valve body. A first-stage boss is provided on the inner wall of the valve body below the lower valve seat, and a spring is provided between the lower valve seat and the first-stage boss to support the lower valve seat. The lower valve seat is slidably matched with the valve body. A passage is provided on the lower valve seat to communicate the space above it to its interior, so as to realize positive circulation operation when the ball valve is in the closed state. The present invention is used for oilfield drilling operations.

[0006] In the above prior art, on the basis of providing an elastic mechanism on the lower valve seat, a circulation hole is also provided on the lower valve seat or a passage is provided on the lower valve seat to communicate the space above it to its interior. The two cooperate with each other to achieve the effect of offsetting part of the liquid pressure, reducing the pressure received by the ball valve, and thus reducing the opening torque of the ball valve. However, in the above prior art, the circulation hole or the passage provided on the lower valve seat to communicate the space above it to its interior is in a normally open state. When fluid enters the valve from the lower part of the valve, the fluid will continue to flow into the space between the upper valve seat and the lower valve seat through the above circulation hole. Then the thrust of the fluid on the ball valve will be correspondingly weakened, and the fluid entering from the lower part may escape from the through hole at the upper valve seat. Therefore, the sealing effect of the entire plug valve is not very ideal. Summary of the Invention

[0007] In order to solve the problems and deficiencies existing in the above prior art, the purpose of this application is to provide a plug valve that can not only reduce the opening torque of the valve but also improve the sealing performance of the valve.

[0008] In order to achieve the above invention purpose, the technical solution of this application is as follows:

[0009] A cock valve includes a valve body, an upper valve seat, a valve ball, a lower valve seat and a valve ball opening mechanism arranged in the valve body. The valve ball is clamped between the upper valve seat and the lower valve seat, and the valve ball opening mechanism is connected to the valve ball. The lower valve seat includes a first lower valve seat and a second lower valve seat. The first lower valve seat is connected to the valve body, and the second lower valve seat is sleeved on the first lower valve seat. The upper valve seat, the valve ball and the second lower valve seat form a sealing pair in the valve body. A first opening is circumferentially arranged on the upper edge of the first lower valve seat, and a second opening is circumferentially arranged on the upper edge of the second lower valve seat. A spring is arranged at the bottom of the second lower valve seat, and the other end of the spring is connected to the first lower valve seat. The second lower valve seat can reciprocate relative to the first lower valve seat along its axis direction. The valve ball opening mechanism can drive the valve ball to rotate around a fixed axis to switch its communication state.

[0010] Further, an installation groove is arranged on the first lower valve seat, and a sliding convex block is arranged on the outer wall of the second lower valve seat. The sliding convex block is fitted and installed in the installation groove and can slide in the installation groove.

[0011] Further, an upper valve seat fixing mechanism is arranged on the upper valve seat. The upper valve seat fixing mechanism includes a ring hook, a bushing and a pressing plate. A circular groove for accommodating the ring hook is circumferentially arranged on the inner wall of the valve body. The ring hook is a split structure and is formed by enclosing a plurality of ring hook bodies. A clamping block is arranged at one end of the ring hook body, and a clamping groove engaged with the clamping block is arranged on the first lower valve seat. The other end of the ring hook body is arranged in the circular groove. The bushing is arranged inside the circle formed by enclosing a plurality of ring hook bodies. The outer side wall of the bushing is in contact with the ring hook body, and the lower end face of the bushing is in contact with the upper end face of the upper valve seat. The pressing plate is a split structure and is formed by enclosing a plurality of pressing plate bodies. A threaded hole is arranged on the ring hook body, a screw is arranged at one end of the pressing plate body, and the pressing plate body is connected to the ring hook body through the screw. The other end of the pressing plate body extends radially along the valve body and is located above the bushing.

[0012] Further, the plurality of pressing plate bodies and the bushing are integrally formed. The lower end face of the bushing is in contact with the upper end face of the upper valve seat, the upper end face is connected to one end of the pressing plate body, a threaded hole is arranged on the ring hook body, and a screw is arranged at the other end of the pressing plate body. The pressing plate body is connected to the ring hook body through the screw.

[0013] Further, the number of the ball valve opening mechanisms is multiple and they are evenly distributed with respect to the valve ball.

[0014] The beneficial effects of this application:

[0015] (1)When the plug valve of the present application is in use, when the liquid pressure of the upper positive circulation operation acts on the valve ball, the liquid pressure pushes the valve ball downward. The valve ball acts on the first lower valve seat and compresses the spring. Under the action of the spring thrust, part of the liquid pressure of the incoming liquid from the upper part can be offset, reducing the valve ball pressure, and thus reducing the valve ball opening torque. Further, since openings are provided on both the first lower valve seat and the second lower valve seat, when the second lower valve seat moves downward, the first opening and the second opening gradually coincide and communicate, thereby forming another liquid passage in the valve body. The fluid of the incoming liquid from the upper part can flow out through the above passage. Therefore, since part of the fluid flows out from the above passage in advance, the pressure of the incoming liquid from the upper part acting on the valve ball is further reduced. When the operator opens the valve, it is more labor-saving and the valve is easier to open.

[0016] (2)When the plug valve of the present application is in the closed state, the two openings on the first lower valve seat and the second lower valve seat are always staggered from each other. When the fluid enters the valve reversely from the lower part of the valve, under the action of the fluid pressure, the two openings can never coincide, and the two openings cannot communicate with each other to form a liquid passage. Therefore, the fluid pressure acts entirely on the valve ball. Compared with the prior art, the present application increases the upward thrust of the lower fluid on the valve ball, so that the valve ball tightly presses the upper valve seat, improving the sealing effect of the valve.

[0017] (3)The plug valve of the present application can perform a positive circulation operation in the state where the valve ball is closed. The liquid pressure of the upper positive circulation operation can push the valve ball open, separating the valve ball from the upper valve seat. The valve ball drives the second lower valve seat to move towards the first lower valve seat under the action of the liquid pressure, so that the two openings on the first lower valve seat and the second lower valve seat communicate with each other to form a liquid passage, and the liquid flows out from the above passage, realizing the positive circulation operation. Since it is not necessary to frequently open and close the plug valve, not only time is saved, but also the wear of the plug valve is reduced.

[0018] (4)In the present application, the second lower valve seat is connected to the first lower valve seat through a spring, achieving the effect that the second lower valve seat can reciprocate relative to the first lower valve seat along its axis. Further, the two are connected through a structure similar to a slider and a chute, restricting the direction of the second lower valve seat when reciprocating along the axis of the first lower valve seat and preventing it from deviating during the movement.

[0019] (5)In the present application, the upper valve seat is not directly connected to the valve body, but is arranged in the valve body through a split-type upper valve seat fixing mechanism. Compared with the existing method of directly connecting the upper valve seat to the inner wall of the valve body by means of thread connection, the upper valve seat of the valve in the present application is easier to disassemble during subsequent maintenance.

[0020] (6)In the present application, the bushing and the pressing plate adopt an integral structure, and the overall erosion resistance of the valve is better, which can prevent the ring hook body from being eroded and damaged. Brief Description of the Drawings

[0021] The foregoing and following specific descriptions of the present application will become clearer when read in conjunction with the following drawings, in which:

[0022] Figure 1 is the explosion diagram of the cock valve of the present application;

[0023] Figure 2 is the top view structural diagram of the cock valve of the present application;

[0024] Figure 3 is Figure 2 the C-C cross-sectional view in (the arrow direction in the figure is the flow direction of the liquid when the valve is in use);

[0025] Figure 4 is Figure 2 the D-D cross-sectional view in (the arrow direction in the figure is the flow direction of the liquid when the valve is in use);

[0026] Figure 5 is the connection schematic diagram of the first lower valve seat and the second lower valve seat of the present application;

[0027] Figure 6 is the schematic diagram of the integrally formed structure of the bushing and the pressing plate in Embodiment 3 of the present application.

[0028] In the figure:

[0029] 1. Valve body; 2. Upper valve seat; 3. Valve ball; 4. Lower valve seat; 5. Valve ball opening mechanism; 6. Spring; 7. Installation groove; 8. Sliding convex block; 9. Upper valve seat fixing mechanism; 10. Annular groove; 11. Block; 12. Card slot; 41. First lower valve seat; 42. Second lower valve seat; 91. Ring hook; 92. Bushing; 93. Pressing plate; 411. First opening; 421. Second opening; 911. Ring hook body; 931. Pressing plate body. Detailed Description of the Embodiments

[0030] In order to enable those skilled in the art to better understand the technical solutions in the present application, the following will further illustrate the technical solutions for achieving the invention purpose of the present application through several specific embodiments. It should be noted that the technical solutions claimed in the present application include but are not limited to the following embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts shall fall within the protection scope of the present application.

[0031] Embodiment 1

[0032] When the plug valve is in the closed state and needs to be opened for use, due to the excessive liquid pressure from the upper part, all the above liquid pressure directly acts on the valve ball. The thrust received by the valve ball will be very large, resulting in the valve ball being tightly pressed on the lower valve seat, causing a large opening torque of the valve. When workers open the valve, it is very laborious, and sometimes the valve cannot even be opened. In the prior art, in order to reduce the opening torque of the valve, an elastic mechanism is generally arranged in the valve body to offset part of the liquid pressure, thereby reducing the opening torque of the valve and ensuring that the valve can be normally opened. However, the effect of only setting the elastic mechanism to offset the liquid pressure is not very ideal.

[0033] Based on this, this embodiment provides a plug valve that can better reduce the opening torque of the valve and can also improve the sealing performance of the valve. Referring to the attached Figures 1-5 , the plug valve is composed of a valve body 1 and an upper valve seat 2, a valve ball 3, a lower valve seat 4 and a valve ball opening mechanism 5 arranged in the valve body 1. Among them, the valve ball 3 is clamped between the upper valve seat 2 and the lower valve seat 4, and the valve ball opening mechanism 5 is connected to the valve ball 3. The lower valve seat 4 is composed of two sleeved valve seats, namely a first lower valve seat 41 and a second lower valve seat 42. The sizes of the two valve seats are slightly different. The size of the first lower valve seat 41 is larger, and the overall outer diameter size of the second lower valve seat 42 is slightly smaller than the aperture size of the through hole provided on the first lower valve seat 41. The first lower valve seat 41 is connected to the valve body 1, and the second lower valve seat 42 is sleeved in the through hole of the first lower valve seat 41. The axes of the two valve seats coincide with each other. Therefore, the upper valve seat 2, the valve ball 3 and the second lower valve seat 42 form a sealing pair in the valve body 1 to realize the flow and blockage of liquid in the valve. There is a step on the inner wall of the valve body 1, and the first lower valve seat 41 is arranged on the step; further, a first opening 411 is arranged on the first lower valve seat 41 along the circumferential direction, and a second opening 421 is arranged on the second lower valve seat 42 along the circumferential direction. A spring 6 is arranged at the bottom of the second lower valve seat 42, and the other end of the spring 6 is connected to the first lower valve seat 41. The spring 6 is arranged along the axis direction of the valve seat, and the elastic force generated by the spring 6 also acts along the axis direction. Therefore, under the action of the spring 6, the second lower valve seat 42 can reciprocate relative to the first lower valve seat 41 along its axis direction; the second lower valve seat 42 can move relative to the first lower valve seat 41 to form a first working position and a second working position; the valve ball opening mechanism 5 can drive the valve ball 3 to rotate around a fixed axis to switch its communication state, so that the two ends of the through hole of the valve ball 3 are respectively communicated with the through hole of the upper valve seat 2 and the through hole of the lower valve seat 4, or the through hole of the valve ball 3 is not communicated with the through hole of the upper valve seat 2 and the through hole of the lower valve seat 4.

[0034] When the plug valve is in the closed state, when liquid enters from the upper part of the valve (i.e., the liquid inlet end), the liquid directly acts on the valve ball through the through hole on the upper valve seat. The valve ball is subjected to the thrust of the liquid, separates from the upper valve seat and moves towards the lower valve seat, transmitting the thrust of the liquid to the second lower valve seat. The second lower valve seat moves downward to compress the spring arranged at the bottom. Under the action of the spring thrust, part of the liquid pressure of the liquid coming from the upper part of the valve can be offset, reducing the pressure on the valve ball, and thus reducing the opening torque of the valve ball. Further, openings are provided on both the first lower valve seat and the second lower valve seat. Initially, the first opening and the second opening are staggered from each other. When the second lower valve seat moves downward relative to the first lower valve seat, when the relative movement causes the first opening and the second opening to at least partially overlap, it is the first working position. At this time, the two openings are connected to form a liquid passage in the valve body, and the liquid coming from the upper part can flow out through the above passage. Therefore, since part of the liquid flows out of the above passage in advance, the pressure of the liquid coming from the upper part acting on the valve ball is further reduced. When the operator opens the valve, it is more labor-saving and the valve is easier to open. When the second lower valve seat moves downward relative to the first lower valve seat to the limit position, the two openings completely overlap, and the size of the formed liquid passage is the largest, and the pressure of the liquid coming from the upper part on the valve ball is the smallest. When the relative movement causes the first opening and the second opening to be staggered, it is the second working position, and the two openings cannot be connected to form a liquid passage in the valve body. At this time, when fluid enters from the lower part of the valve (i.e., the liquid outlet end), the fluid pressure will act entirely on the valve ball, increasing the upward thrust of the lower fluid on the valve ball. And under the action of the lower fluid pressure, the two openings are always in a staggered state and cannot overlap, thereby improving the sealing effect of the valve.

[0035] In the present application, since the valve ball drives the second lower valve seat to move towards the first lower valve seat under the action of the liquid pressure, the two openings on the first lower valve seat and the second lower valve seat are connected to each other to form a liquid passage, and the liquid can flow out from the above passage. Therefore, the plug valve of the present application can also realize the positive circulation operation of the drilling fluid without rotating and opening the valve ball. Since it is not necessary to frequently open and close the plug valve, not only time is saved, but also the wear of the plug valve is reduced.

[0036] Embodiment 2

[0037] This embodiment provides a plug valve. On the basis of Embodiment 1, this embodiment further limits the structure of the plug valve as follows.

[0038] Refer to the attached drawings of the specification Figure 5, in order to enable the second lower valve seat to move reciprocally relative to the first lower valve seat along a specified direction and the overall movement to be smoother, in this embodiment, an installation groove 7 is provided on the first lower valve seat 41 along the axial direction, and a sliding convex block 8 is provided on the outer wall of the second lower valve seat 42 along the axial direction. The sliding convex block 8 is fitted and installed in the installation groove 7, and the sliding convex block 8 can slide arbitrarily along the axial direction in the installation groove 7. Further, in this embodiment, the spring 6 is also located in the installation groove 7. One end of the spring 6 is connected to the bottom of the slider convex block 8 of the second upper valve seat 42, and the other end is connected to the first lower valve seat 41.

[0039] Refer to the attached drawings of the specification Figure 1 , attached Figure 3 and attached Figure 4 , in order to make the upper valve seat easier to disassemble during subsequent maintenance of the valve, this embodiment has improved the fixing method of the upper valve seat in the valve body. In this embodiment, an upper valve seat fixing mechanism 9 is provided on the side of the upper valve seat 2 away from the valve ball 3. The upper valve seat fixing mechanism 9 includes a ring hook 91, a bushing 92, and a pressing plate 93. An annular groove 10 for accommodating the ring hook 91 is provided on the inner wall of the valve body 1 along the circumferential direction. The ring hook 91 is a split structure, formed by enclosing a plurality of ring hook bodies 911 to form a complete circular ring hook 91. A clamping block 10 is provided on the lower end surface of the ring hook body 911, and a clamping groove 12 is provided on the upper end surface of the first lower valve seat 41. The clamping block 11 is clamped in the clamping groove 12, and the upper end surface of the ring hook body 911 is arranged in the annular groove 10. The bushing 92 is a complete circular structure, arranged inside the circle formed by enclosing a plurality of ring hook bodies 911. The outer side wall of the bushing 92 is in contact with the ring hook body 911, and the lower end surface of the bushing 92 is in contact with the upper end surface of the upper valve seat 41, pressing on the upper end surface of the upper valve seat 41. The pressing plate 93 is a split structure, formed by enclosing a plurality of pressing plate bodies 931. The number of pressing plate bodies 931 matches the number of ring hook bodies 911. A screw is provided at one end of the pressing plate body 931, and a threaded hole is correspondingly provided on the ring hook body 911. The pressing plate body 931 is connected to the ring hook body 911 through a screw. The other end of the pressing plate body 931 extends along the radial direction of the valve body 1 and is located above the bushing 92, for pressing against the bushing to prevent it from coming out, that is, the bushing 92 is located between the pressing plate body 931 and the upper valve seat 2.

[0040] Further, the number of the ball valve opening mechanisms 5 is multiple and they are evenly distributed with respect to the valve ball 3.

[0041] In a traditional cock valve, an internal thread is provided on the inner wall of the valve body, and an external thread is provided on the upper valve seat. When installing the valve, the upper valve seat is screwed into the valve body. The upper valve seat is connected to the valve body by means of a threaded connection and is fixedly arranged in the valve body. During long-term use, impurities such as cement and mud will enter the gaps of the above-mentioned threaded connection, and the upper valve seat will adhere to the valve body. When repairing and replacing valve components later, it is very difficult to disassemble the upper valve seat. Therefore, this application changes the connection relationship between the upper valve seat and the valve body. The upper valve seat in this application is not directly connected to the valve body, but is connected to the valve body through an upper valve seat fixing mechanism. Moreover, the upper valve seat fixing mechanism and the valve body do not adopt the traditional threaded connection method, but are fixed by the mutual cooperation of a pressing plate, a bushing, a ring hook and an annular groove provided on the inner wall of the valve body. When repairing the valve, it is easier to disassemble the components.

[0042] Embodiment 3

[0043] This embodiment provides a cock valve. This embodiment is a further improvement based on Embodiment 2. Therefore, the main difference between this embodiment and Embodiment 2 lies in the different structures of the upper valve seat fixing mechanism. Refer to the attached Figure 6 , and the specific structure is as follows.

[0044] In this embodiment, the plurality of pressing plate bodies 931 and the bushing 92 are integrally formed. The lower end surface of the bushing 92 contacts the upper end surface of the upper valve seat 41, and the upper end surface is connected to one end of the pressing plate body 931. A threaded hole is provided on the ring hook body 911, and a screw is provided at the other end of the pressing plate body 931. The pressing plate body 931 is connected to the ring hook body 911 by the screw. Generally speaking, the bushing 92 is still pressed between the pressing plate body 931 and the upper valve seat 2.

[0045] On the side of the upper valve seat away from the valve ball, there is an upper valve seat fixing mechanism, which includes a ring hook 91, a bushing 92, and a pressing plate 93. An annular groove 10 for accommodating the ring hook 91 is provided along the circumference on the inner wall of the valve body 1. The ring hook 91 is a split structure, formed by enclosing multiple ring hook bodies 911 to form a complete circular ring hook 91. One end of the ring hook body 911 is provided with a clamping block 11, and the first lower valve seat 41 is provided with a clamping groove 12, and the clamping block 11 is clamped in the clamping groove 12. The other end of the ring hook body 911 is arranged in the annular groove 10. The bushing 92 and the pressing plate 93 are integrally formed. The bushing 92 is a complete circular structure. The bushing 92 is arranged inside the circle formed by enclosing the ring hook bodies 911. The outer side wall of the bushing 92 is in contact with the ring hook bodies 911, and the lower end surface of the bushing 92 is in contact with the upper end surface of the upper valve seat 41, pressing on the upper end surface of the upper valve seat 41. One end of the pressing plate 93 is connected to the upper end surface of the bushing 92, and the other end presses on the upper end surface of the ring hook bodies 911. Threaded holes are provided on the ring hook bodies 911, and screws are provided on the pressing plate body 931. The pressing plate body 931 is connected to the ring hook bodies 911 through screws.

[0046] Compared with Embodiment 2, this embodiment makes certain improvements to the structures of the pressing plate and the bushing. In this embodiment, the pressing plate body and the bushing are integrally formed, and the overall structure has better erosion resistance, which can avoid the ring hook being eroded and damaged. At the same time, it also improves the convenience of maintenance.

[0047] In this application, positive circulation means that the drilling fluid enters the valve from the upper part of the valve, flows through the through holes on the upper valve seat, the through holes on the valve ball, and the through holes on the lower valve seat, and finally flows out of the valve from the lower part of the valve. The upper part of the valve refers to the liquid inlet end of the valve, and the lower part refers to the liquid outlet end of the valve.

[0048] In the description of this application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the protection scope of this application.

[0049] In the description of the present application, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0050] The above are only the preferred embodiments of the present application, and do not impose any formal restrictions on the present application. Any simple modifications and equivalent changes made to the above embodiments based on the technical essence of the present application all fall within the protection scope of the present application.

Claims

1. A plug valve, comprising a valve body (1), an upper valve seat (2), a valve ball (3), a lower valve seat (4) and a valve ball opening mechanism (5) arranged in the valve body (1), the valve ball (3) being clamped between the upper valve seat (2) and the lower valve seat (4), the valve ball opening mechanism (5) being connected to the valve ball (3), characterized in that: The lower valve seat (4) includes a first lower valve seat (41) and a second lower valve seat (42). The first lower valve seat (41) is connected to the valve body (1), and the second lower valve seat (42) is sleeved on the first lower valve seat (41). The upper valve seat (2), the valve ball (3) and the second lower valve seat (42) form a sealing pair within the valve body (1). A first opening (411) is circumferentially provided on the first lower valve seat (41), and a second opening (421) is circumferentially provided on the second lower valve seat (42). A spring (6) is provided at the bottom of the second lower valve seat (42), and the other end of the spring (6) is connected to the first lower valve seat (41). The second lower valve seat (42) can reciprocate relative to the first lower valve seat (41) along its axis direction; the valve ball opening mechanism (5) can drive the valve ball (3) to rotate around a fixed axis to switch its communication state; An installation groove (7) is provided on the first lower valve seat (41), and a sliding convex block (8) is provided on the outer wall of the second lower valve seat (42). The sliding convex block (8) is fitted and installed in the installation groove (7) and can slide within the installation groove (7); An upper valve seat fixing mechanism (9) is provided on the upper valve seat (2). The upper valve seat fixing mechanism (9) includes a ring hook (91), a bushing (92) and a pressing plate (93). An annular groove (10) for accommodating the ring hook (91) is circumferentially provided on the inner wall of the valve body (1). The ring hook (91) is of a split structure and is formed by enclosing a plurality of ring hook bodies (911). A clamping block (11) is provided at one end of the ring hook body (911), and a clamping groove (12) for clamping with the clamping block (11) is provided on the first lower valve seat (41). The other end of the ring hook body (911) is arranged in the annular groove (10); the bushing (92) is arranged within the circle formed by enclosing a plurality of ring hook bodies (911). The outer side wall of the bushing (92) contacts the ring hook body (911), and the lower end surface of the bushing (92) contacts the upper end surface of the upper valve seat (2); the pressing plate (93) is of a split structure and is formed by enclosing a plurality of pressing plate bodies (931). A threaded hole is provided on the ring hook body (911), a screw is provided at one end of the pressing plate body (931), and the pressing plate body (931) is connected to the ring hook body (911) through the screw. The other end of the pressing plate body (931) extends radially along the valve body (1) and is located above the bushing (92).

2. The plug valve according to claim 1, characterized in that: The plurality of pressing plate bodies (931) are integrally formed with the bushing (92). The lower end surface of the bushing (92) contacts the upper end surface of the upper valve seat (2), and the upper end surface is connected to one end of the pressing plate body (931). A threaded hole is provided on the ring hook body (911), and a screw is provided at the other end of the pressing plate body (931). The pressing plate body (931) is connected to the ring hook body (911) through the screw.

3. The plug valve according to claim 1, characterized in that: The number of the valve ball opening mechanisms (5) is multiple and they are evenly distributed with respect to the valve ball (3).

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