A valve trim and direct stroke valve

Abstract

The utility model provides a valve inner part and straight stroke valve belongs to valve technical field, include: seal ring, valve core and welding bellows, the valve rod is arranged in seal ring, valve core sets up at the end of valve rod, has the extension of extending towards fluid passage on valve core, the extension is always with the inner wall of fluid passage sliding fit in the process of opening and closing of fluid passage, welding bellows is set in the outside of valve rod, the first end of welding bellows is welded with seal ring, the second end of welding bellows is welded with valve core, is provided with the balance hole of intercommunication welding bellows inner chamber and fluid passage on valve core, and the opening and plugging of balance hole make valve type have balanced type and unbalanced type conversion. Through the location cooperation of extension and seal ring in both ends and guide, balance cylinder and sleeve are omitted, and the number of parts is reduced, and the structure is simpler, and the installation is convenient, the utility model provides valve inner part, solves the problem that the internal part of balanced type valve body is more in prior art, and the structure is complex.

Description

TECHNICAL FIELD

[0001] The utility model relates to valve technical field, concretely relates to a valve inner and straight stroke valve. BACKGROUND

[0002] Industrial processes (such as petroleum, chemical, oil refining, power, pipeline, pulp and papermaking, etc.) with fluid generally need to use stop valves or control valves, especially straight stroke control valves, which have good whole-process control performance. When the straight stroke control valve works, the pressure difference before and after the valve acts on the valve core, which will generate a thrust on the valve core. For unbalanced valves, the thrust acts completely on the valve core, and for balanced valves, certain measures are taken to reduce or eliminate the thrust. Balanced valves have lower requirements for actuator output and control system than unbalanced valves, but their sealing level is lower than that of unbalanced valves of the same type.

[0003] The sliding seal (packing) of straight stroke control valves has always been a focus of quality problems such as leakage. The corrugated tube is the best solution to completely solve the sliding seal of unbalanced straight stroke valves, ensuring the highest level of zero external leakage, but the traditional external corrugated tube structure requires the design of additional pressure-bearing sleeve and other complex accessories, which increases the volume of the valve pressure-bearing part, increases the leakage points and significantly increases the cost.

[0004] Chinese patent document (CN212564475U) discloses a sleeve valve with a corrugated tube balance sleeve, a valve plug is arranged in the valve body, the valve plug is driven to open or close the valve through a valve stem, a balance hole is arranged on the valve plug to keep the pressure balance on both sides of the valve plug when the valve is closed.

[0005] In the above scheme, a balance cylinder and a corrugated tube are further arranged in the valve body, the balance cylinder is sealingly arranged between the upper valve cover and the valve body, one end of the corrugated tube is welded to the balance cylinder, and the other end is welded to the valve plug. In the above scheme, the structure of the balance cylinder includes a cylindrical structure extending towards the corrugated tube, the cylindrical structure of the balance cylinder is arranged to make the outer corrugation of the corrugated tube fit the inner wall of the balance cylinder, so as to guide and limit the corrugated tube, making the expansion and contraction of the corrugated tube more stable.

[0006] In the above scheme, a sleeve is further arranged in the valve body, the sleeve is installed on the valve body for secondary guiding, so that the valve plug is easy to center during use and is not easy to tilt or dislocate.

[0007] However, in the above scheme, the cylindrical structure of the balance cylinder and the sleeve arranged in the valve body result in a large number of parts in the valve body and a complex structure, which is not convenient for production and assembly. UTILITY MODEL CONTENTS

[0008] Therefore, the utility model wants to solve the technical problem in prior art is in, the inside part of balance type valve body is more, the problem of complex structure, thereby provide a valve trim and straight stroke valve, this simple built-in bellows valve trim structure can block up balance hole, become non balance type straight stroke valve.

[0009] In order to solve the above technical problems, the utility model provides a valve trim for setting in valve body, it include: sealing ring, valve core and welded bellows, the valve rod is arranged in the sealing ring, the valve core is arranged at the end of the valve rod, and the valve core is used for closing the fluid passage in the valve body, the valve core has the extension part extending towards the fluid passage, the extension part is always in sliding fit with the inner wall of the fluid passage in the process that the valve core opens and closes the fluid passage, the welded bellows is sleeved on the outside of the valve rod, the first end of the welded bellows is welded with the sealing ring, the second end of the welded bellows is welded with the valve core, the valve core is provided with balance hole, and the balance hole passes through the valve core and makes the inner chamber of the welded bellows communicate with the fluid passage.

[0010] In use, the valve trim is applied to the valve body, in the process that the valve core opens and closes the fluid passage, the valve rod is limited through the sealing ring, the extension part slides along the inner wall of the fluid passage, through the limiting fit of the two ends of the valve trim, the valve core and the valve rod are guided, the balance cylinder and the sleeve are omitted, the number of parts is reduced, the structure is simpler, and installation is facilitated, the welded bellows has good compression ratio, compared with the traditional formed bellows, space is saved, the built-in design in the valve body can be realized, and the self-centering effect of the welded bellows under pressure can assist the guidance and damping of the valve core and the valve rod, the fluid medium enters the inner chamber of the welded bellows through the balance hole on the valve core, the unbalanced force is relatively offset, dynamic balance is formed in the valve body, the smooth operation of the valve is ensured, the welded bellows can also play a sealing role, and internal leakage is prevented, the valve trim provided by the utility model solves the problems of more internal parts and complex structure of the balance type valve body in the prior art, and improves the closing grade of the balance type straight-through valve.

[0011] Optionally, the valve core has the guide part extending towards the fluid passage, the guide part has a plurality of intervals around the circumference of the valve core, and the extension part is arranged at the extension end of the guide part. Through the above setting, in the process that the valve core opens and closes the fluid passage, the guide part drives the extension part to slide in the valve seat, and the movement track of the valve core is guided, when the valve core opens to the maximum position, the extension part on the guide part remains the blocking fit with the valve seat, under the impact of the fluid medium, the shaking of the valve core and the valve rod can be reduced, and the deviation of the valve core relative to the valve seat to cause the fluid passage to be unable to be normally closed is prevented.

[0012] Optionally, the guide portion and the extension portion have arc-shaped outer walls. Through the above arrangement, the arc-shaped outer walls can make the guide portion and the extension portion fit the inner side wall of the opening of the valve seat, thereby enhancing the stability of the guide portion and the extension portion in sliding in the valve seat.

[0013] Optionally, the two side edges of the guide portion are arc-shaped, so that a flow guide opening is formed between the two guide portions. Through the above arrangement, when the valve core opens the fluid passage, the fluid medium flows through the flow guide opening between the two guide portions in the valve body, and the arc-shaped two side edges of the guide portion can guide the fluid medium when it flows through the flow guide opening, thereby reducing disturbance.

[0014] Optionally, the width of the flow guide opening gradually increases in a direction away from the valve core. Through the above arrangement, during the opening and closing of the fluid passage by the valve core, the guide portion slides along the valve seat, and as the distance between the valve core and the valve seat changes, the area of the flow guide opening exposed to the valve seat changes linearly, so that the flow area between the valve core and the valve seat changes, thereby being able to adjust the flow.

[0015] Optionally, a gap is formed between the roots of the two adjacent guide portions. Through the above arrangement, the gap between the roots of the two adjacent guide portions has a certain flow area, which prevents the flow area between the valve core and the valve seat from being too small when the valve core is opened.

[0016] Optionally, the two side edges of the extension portion are linear. Through the above arrangement, the linear two side edges can make the extension portion uniform in force.

[0017] Optionally, a sliding seal is arranged between the sealing ring and the valve stem. Through the above arrangement, the fluid medium in the welded bellows cavity can be prevented from leaking outward.

[0018] Optionally, a sealing member for plugging is arranged in the balance hole. Through the above arrangement, the sealing member can plug the balance hole, the balance hole can be sealed, the balanced valve element can be converted into a non-balanced valve element, the welded bellows can prevent external leakage, the same structure can become a non-balanced valve with built-in welded bellows and zero leakage, zero external leakage can be achieved, and the application range of the valve element and the valve type can be increased.

[0019] The utility model provides a kind of direct stroke valve, comprising: valve body, valve seat, valve cover and the valve element of any one of the above scheme, the valve body has fluid passage, the valve seat is arranged in the fluid passage, the valve element is arranged in the valve body, the valve element is in sealing contact with the valve seat, and the valve cover is arranged in the upper end surface of the valve body. Since the above valve element is used, dynamic balance is formed in the valve body, the stable operation of valve is guaranteed, so it has the advantages of any one of the above.

[0020] Optionally, the valve core is provided with a flange in the circumferential direction, the valve seat is provided with a first groove, a static seal is arranged in the first groove, in the closed state, the flange is embedded in the first groove; the valve body is provided with a second groove, the sealing ring of the valve inner part is embedded in the second groove, the second groove is provided with a static seal, the static seal is located between the sealing ring of the valve inner part and the valve body; the top of the valve cover is provided with a sealing cavity, the part of the valve stem extending out of the valve cover is located in the sealing cavity, the upper part of the sealing cavity is provided with a driving mechanism, the driving rod of the driving mechanism extends into the sealing cavity and is connected with the valve stem. Through the above arrangement, during the operation of the valve, the valve cover will generate dynamic compression force, the sealing ring can disperse and uniformly transmit the pressure, ensure that the force on the entire circumferential surface is uniform, thereby protecting the static seal in the second groove from unnecessary damage, keeping the static seal from deforming after being stressed, and avoiding external leakage; in the closed state of the valve core, the flange is embedded in the first groove and extrudes the static seal, which can ensure the sealing between the valve core and the valve seat; the sealing cavity can protect the valve stem extending out of the valve cover, and the valve stem is driven to rotate by the driving mechanism, thereby driving the valve to operate. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings described below are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0022] Figure 1 It is a schematic view of one embodiment of the valve inner part provided in the embodiments of the present application;

[0023] Figure 2 It is a left view schematic view of the valve inner part;

[0024] Figure 3 It is Figure 1 It is a schematic view of the plug seal arranged in the balance hole.

[0025] Explanation of reference signs:

[0026] 1, sealing ring; 2, valve stem; 3, valve core; 4, welded corrugated pipe; 5, balance hole; 6, guide part; 7, flow guide; 8, curved surface structure; 9, extension; 10, valve body; 11, valve seat; 12, valve cover; 13, first groove; 14, second groove; 15, sealing cavity; 16, driving mechanism; 17, seal. DETAILED DESCRIPTION

[0027] The technical solutions of the present application will be described clearly and completely in connection with the drawings. Obviously, the described embodiments are some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0028] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second", "third" are only for the purpose of description, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0031] The present embodiment provides a structure of a valve element capable of balancing, for opening and closing of a valve.

[0032] As Figure 1As shown, a specific embodiment of a valve inner part provided by the present embodiment is used for being arranged in a valve body 10, which comprises a sealing ring 1, a valve core 3 and a welded bellows 4; a valve rod 2 is arranged in the sealing ring 1; the valve core 3 is arranged at the end of the valve rod 2, and is used for closing a fluid passage in the valve body 10; the valve core 3 has an extension 9 extending towards the fluid passage; the extension 9 is always in sliding fit with the inner wall of the fluid passage during the opening and closing of the valve core 3; the welded bellows 4 is sleeved on the outer side of the valve rod 2; the first end of the welded bellows 4 is welded with the sealing ring 1, and the second end of the welded bellows 4 is welded with the valve core 3; the valve core 3 is provided with a balance hole 5, which passes through the valve core 3 to make the inner cavity of the welded bellows 4 communicate with the fluid passage.

[0033] In use, the valve inner part is applied to the valve body 10; during the opening and closing of the valve core 3 to the fluid passage, the valve rod 2 is limited by the sealing ring 1, and the extension 9 slides along the inner wall of the fluid passage; the limiting fit at both ends of the valve inner part plays a guiding role for the valve core 3 and the valve rod 2, and the balance cylinder and sleeve are omitted, the number of parts is reduced, the structure is simpler, and the installation is facilitated; the welded bellows 4 has a good compression ratio, saves space compared with the traditional formed bellows, can realize the built-in design in the valve body 10, and the self-centering effect of the welded bellows 4 under pressure can assist the guiding and damping of the valve core 3 and the valve rod 2; the fluid medium enters the inner cavity of the welded bellows 4 through the balance hole 5 on the valve core 3, the unbalanced force is relatively offset, a dynamic balance is formed in the valve body 10, the smooth operation of the valve is ensured, and the welded bellows 4 can also play a sealing role to prevent internal leakage; the valve inner part provided by the present embodiment solves the problems of too many internal parts and complex structure of the balance type valve body 10 in the prior art.

[0034] It should be noted that the valve inner part provided by the present embodiment can change the unbalanced valve inner part into a balanced valve inner part by arranging the balance hole 5 on the valve core 3. According to the size of the valve and the application conditions, one or more balance holes 5 can be designed.

[0035] As Figure 1 , Figure 2As shown, in the valve internals provided in this embodiment, the valve core 3 has a guide portion 6 extending toward the fluid channel. The guide portion 6 has multiple portions circumferentially spaced around the valve core 3, and the extension portion 9 is disposed at the extension end of the guide portion 6. During the opening and closing of the fluid channel by the valve core 3, the guide portion 6 drives the extension portion 9 to slide within the valve seat 11, thereby guiding the movement trajectory of the valve core 3. When the valve core 3 is opened to its maximum position, the extension portion 9 on the guide portion 6 maintains a blocking engagement with the valve seat 11. Under the impact of the fluid medium, this reduces the shaking of the valve core 3 and the valve stem 2, preventing the valve core 3 from shifting relative to the valve seat 11 and thus failing to properly close the fluid channel. Alternatively, as an alternative embodiment, the guide portion 6 can be omitted, and only the extension portion 9 extending toward the fluid channel is provided on the valve core 3.

[0036] like Figure 1 , Figure 2 As shown, in the valve internals provided in this embodiment, the guide portion 6 and the extension portion 9 have arc-shaped outer walls. The arc-shaped outer walls allow the guide portion 6 and the extension portion 9 to fit against the inner wall of the opening in the valve seat 11, thereby enhancing the stability of the guide portion 6 and the limiting portion sliding within the valve seat 11. Alternatively, as an alternative embodiment, the outer walls of the guide portion 6 and the extension portion 9 can also be provided as planes, with the two sides of the planar outer walls slidingly engaging with the inner wall of the opening in the valve seat 11.

[0037] like Figure 1 , Figure 2 As shown, the two sides of the guide portion 6 are arc-shaped, forming a flow guide 7 between the two guide portions 6. When the valve core 3 opens the fluid passage, the fluid medium flows through the flow guide 7 between the two guide portions 6 within the valve body 10. The arc-shaped two sides of the guide portion 6 guide the fluid medium as it flows through the flow guide 7, reducing disturbance. Specifically, the inner wall of the guide portion 6 is configured as a streamlined curved surface structure 8. Alternatively, as an alternative embodiment, the two sides of the two guide portions 6 can also be configured as straight lines.

[0038] like Figure 2As shown in the figure, the width of the flow guide port 7 gradually increases along the direction away from the valve core 3. During the opening and closing of the fluid passage by the valve core 3, the guide part 6 slides along the valve seat 11, and as the distance between the valve core 3 and the valve seat 11 changes, the area of the flow guide port 7 exposed on the valve seat 11 changes linearly, so that the flow area between the valve core 3 and the valve seat 11 changes, thereby being able to adjust the flow. In addition, as an alternative embodiment, the width of the flow guide port 7 can also be set to be constant.

[0039] As shown in the figure, the width of the flow guide port 7 gradually increases along the direction away from the valve core 3. During the opening and closing of the fluid passage by the valve core 3, the guide part 6 slides along the valve seat 11, and as the distance between the valve core 3 and the valve seat 11 changes, the area of the flow guide port 7 exposed on the valve seat 11 changes linearly, so that the flow area between the valve core 3 and the valve seat 11 changes, thereby being able to adjust the flow. In addition, as an alternative embodiment, the width of the flow guide port 7 can also be set to be constant. Figure 2 As shown in the figure, the width of the flow guide port 7 gradually increases along the direction away from the valve core 3. During the opening and closing of the fluid passage by the valve core 3, the guide part 6 slides along the valve seat 11, and as the distance between the valve core 3 and the valve seat 11 changes, the area of the flow guide port 7 exposed on the valve seat 11 changes linearly, so that the flow area between the valve core 3 and the valve seat 11 changes, thereby being able to adjust the flow. In addition, as an alternative embodiment, the width of the flow guide port 7 can also be set to be constant.

[0040] As shown in the figure, the width of the flow guide port 7 gradually increases along the direction away from the valve core 3. During the opening and closing of the fluid passage by the valve core 3, the guide part 6 slides along the valve seat 11, and as the distance between the valve core 3 and the valve seat 11 changes, the area of the flow guide port 7 exposed on the valve seat 11 changes linearly, so that the flow area between the valve core 3 and the valve seat 11 changes, thereby being able to adjust the flow. In addition, as an alternative embodiment, the width of the flow guide port 7 can also be set to be constant. Figure 1 As shown in the figure, the width of the flow guide port 7 gradually increases along the direction away from the valve core 3. During the opening and closing of the fluid passage by the valve core 3, the guide part 6 slides along the valve seat 11, and as the distance between the valve core 3 and the valve seat 11 changes, the area of the flow guide port 7 exposed on the valve seat 11 changes linearly, so that the flow area between the valve core 3 and the valve seat 11 changes, thereby being able to adjust the flow. In addition, as an alternative embodiment, the width of the flow guide port 7 can also be set to be constant.

[0041] As shown in the figure, the width of the flow guide port 7 gradually increases along the direction away from the valve core 3. During the opening and closing of the fluid passage by the valve core 3, the guide part 6 slides along the valve seat 11, and as the distance between the valve core 3 and the valve seat 11 changes, the area of the flow guide port 7 exposed on the valve seat 11 changes linearly, so that the flow area between the valve core 3 and the valve seat 11 changes, thereby being able to adjust the flow. In addition, as an alternative embodiment, the width of the flow guide port 7 can also be set to be constant. Figure 1 As shown in the figure, the width of the flow guide port 7 gradually increases along the direction away from the valve core 3. During the opening and closing of the fluid passage by the valve core 3, the guide part 6 slides along the valve seat 11, and as the distance between the valve core 3 and the valve seat 11 changes, the area of the flow guide port 7 exposed on the valve seat 11 changes linearly, so that the flow area between the valve core 3 and the valve seat 11 changes, thereby being able to adjust the flow. In addition, as an alternative embodiment, the width of the flow guide port 7 can also be set to be constant.

[0042] As shown in the figure, the width of the flow guide port 7 gradually increases along the direction away from the valve core 3. During the opening and closing of the fluid passage by the valve core 3, the guide part 6 slides along the valve seat 11, and as the distance between the valve core 3 and the valve seat 11 changes, the area of the flow guide port 7 exposed on the valve seat 11 changes linearly, so that the flow area between the valve core 3 and the valve seat 11 changes, thereby being able to adjust the flow. In addition, as an alternative embodiment, the width of the flow guide port 7 can also be set to be constant. Figure 3As shown, in the valve internals provided in this embodiment, a sealing element 17 for sealing is detachably provided inside the balance hole 5. The sealing element 17 seals the balance hole 5, enabling the balanced valve internals to be converted into unbalanced valve internals. The welded bellows 4 prevents external leakage, transforming the same structure into a zero-leakage unbalanced valve with a built-in welded bellows, achieving zero leakage and greatly increasing the applicability of the valve internals and valve types. Specifically, the sealing element 17 can be a pin or stud made of the same material as the valve core 3, or it can be welded shut, welded into the balance hole 5 by a welding block. Alternatively, as an alternative implementation, the sealing element 17 can be omitted. The fluid medium enters the inner cavity of the welded bellows 4 through the balance hole 5 on the valve core 3, where the unbalanced forces are relatively canceled out, forming a dynamic balance within the valve body 10, ensuring stable valve operation. The welded bellows 4 also provides a sealing function to prevent internal leakage.

[0043] It should be further noted that the valve core 3 may not require the balance hole 5, resulting in the same but simpler outcome as 17 described above. When the sealing element 17 blocks the balance hole 5, the sliding seal between the valve stem 2 and the sealing ring 1 forms a double seal, enhancing the sealing effect against external leakage; alternatively, when the sealing element 17 blocks the balance hole 5, the sliding seal between the valve stem 2 and the sealing ring 1 may not be required.

[0044] How to use:

[0045] like Figure 1 As shown, in this embodiment, the valve internals are applied to the valve body 10 during use. The fluid medium enters the cavity formed by the welded bellows 4 and the sealing ring 1 through the balance hole 5 on the valve core 3. This ensures dynamic balance within the valve, with unbalanced forces relatively canceling each other out, thus guaranteeing smooth valve operation. During the process of the valve core 3 opening the fluid passage, the drive mechanism 16 drives the valve stem 2 to rotate, causing the valve core 3 to move away from the valve seat 11. The welded bellows 4 is compressed, and the guide part 6 slides out of the valve seat 11. The flow area at the guide port 7 varies depending on the opening position of the valve core 3, thereby achieving flow regulation. When the valve core 3 is opened to its maximum position, the extension 9 blocks and cooperates with the inner wall of the opening in the valve seat 11 to reduce the shaking of the valve core 3 and the valve stem 2. During the process of the valve core 3 closing the fluid channel, the drive mechanism 16 drives the valve stem 2 to rotate, causing the valve core 3 to move towards the valve seat 11. The welded bellows 4 returns to its original shape, the guide 6 slides into the valve seat 11, and the guide port 7 gradually shrinks until it is completely closed.

[0046] In addition, such as Figure 1As shown in the drawings, the embodiment also provides a direct stroke valve, comprising a valve body 10, a valve seat 11, a valve cover 12 and the valve inner part of any one of the above solutions, the valve body 10 has a fluid passage therein, the valve seat 11 is arranged in the fluid passage, the valve inner part is arranged in the valve body 10, the valve inner part is in sealing contact with the valve seat 11, and the valve cover 12 is arranged on the upper end face of the valve body 10. The direct stroke valve of the balanced type is realized, the design of the valve body 10 built-in welded corrugated pipe 4 makes the volume small and greatly reduces the leakage points, and the cost is greatly reduced without reducing the safety and reliability. Since the valve inner part described in the above embodiment is used, it has any one of the advantages described above.

[0047] As shown in the drawings, Figure 1 As shown in the drawings, the embodiment provides a direct stroke valve, wherein the valve core 3 is provided with a flange in the circumferential direction, the valve seat 11 is provided with a first groove 13, the static seal is arranged in the first groove 13, in the closed state, the flange is embedded in the first groove 13. In the closed state of the valve core 3, the flange is embedded in the first groove 13 and extrudes the static seal, which can ensure the sealing between the valve core 3 and the valve seat 11. In addition, as an alternative embodiment, a sealing groove is arranged on the valve core 3, and a flange for embedding the sealing groove is arranged on the valve seat 11.

[0048] As shown in the drawings, Figure 1 As shown in the drawings, the embodiment provides a direct stroke valve, wherein the valve body 10 is provided with a second groove 14, the sealing ring 1 of the valve inner part is embedded in the second groove 14, the second groove 14 is provided with a static seal, and the static seal is located between the sealing ring 1 of the valve inner part and the valve body 10. In the operation process of the valve, the valve cover 12 will generate dynamic compression force, the sealing ring 1 can disperse and uniformly transmit the pressure, ensure that the entire circumferential surface is uniformly stressed, thereby protecting the static seal in the second groove 14 from unnecessary damage, keeping the static seal from deforming after being stressed, and avoiding external leakage. Specifically, the static seal can be a sealing ring. In addition, as an alternative embodiment, the second groove 14 can be arranged on the sealing ring 1, and the upper end face of the valve body 10 is provided with an annular protrusion for embedding the second groove 14.

[0049] As shown in the drawings, Figure 1As shown, the straight stroke valve provided by the embodiment has a sealing cavity 15 arranged on the top of the valve cover 12, the valve rod 2 extending out of the valve cover 12 is located in the sealing cavity 15, a driving mechanism 16 is arranged above the sealing cavity 15, and the driving rod of the driving mechanism 16 extends into the sealing cavity 15 and is connected with the valve rod 2. The sealing cavity 15 can protect the valve rod 2 extending out of the valve cover 12, the valve rod 2 is driven to rotate by the driving mechanism 16, thereby driving the valve to operate. Specifically, the driving mechanism 16 is arranged as an electric motor. In addition, as an alternative embodiment, the driving mechanism 16 can be omitted, a hand wheel is arranged at the end of the valve rod 2, the valve rod 2 is driven to rotate by manually rotating the hand wheel by the user, thereby realizing the operation of the valve.

[0050] Obviously, the above embodiment is only an example for clearly illustrating, but not a limitation to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments need not and cannot be exhausted. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A valve trim for placement within a valve body (10), characterized by, The utility model relates to a valve, including: A sealing ring (1) is arranged in the valve rod (2), and a valve core (3) is arranged at the end of the valve rod (2), the valve core (3) is used for closing and opening the fluid passage in the valve body (10), the valve core (3) has an extension (9) extending towards the fluid passage, and the extension (9) is always in sliding fit with the inner wall of the fluid passage during the opening and closing of the valve core (3) to the fluid passage; A welded bellows (4) is arranged on the outer side of the valve rod (2), the first end of the welded bellows (4) is welded with the sealing ring (1), the second end of the welded bellows (4) is welded with the valve core (3), the valve core (3) is provided with a balance hole (5), and the balance hole (5) passes through the valve core (3) to communicate the inner cavity of the welded bellows (4) with the fluid passage. The valve core (3) has a guide portion (6) extending towards the fluid passage, the guide portion (6) is circumferentially spaced around the valve core (3), and the extension (9) is arranged at the extension end of the guide portion (6).

2. The valve trim of claim 1, wherein, The guide portion (6) and the extension (9) both have arc-shaped outer walls.

3. The valve trim of claim 2, wherein, The two side edges of the guide portion (6) are arc-shaped, so that a guide port (7) is formed between the two guide portions (6).

4. The valve trim of claim 2, wherein, The width of the guide port (7) gradually increases away from the valve core (3).

5. The valve trim of claim 4, wherein, And / or, there is a gap between the roots of the two adjacent guide portions (6). The two side edges of the extension (9) are linear.

6. The valve trim of any one of claims 2-5, wherein, A sliding seal is arranged between the sealing ring (1) and the valve rod (2).

7. The valve trim of any one of claims 1-5, wherein, A sealing member (17) for plugging is detachably arranged in the balance hole (5).

8. The valve trim of any one of claims 1-5, wherein, The utility model relates to a valve, including:

9. A direct stroke valve characterized by, A valve body (10), a valve seat (11), a valve cover (12) and the valve element in any one of claims 1-8, the valve body (10) has a fluid passage, the valve seat (11) is arranged in the fluid passage, the valve element is arranged in the valve body (10), the valve element is in sealing contact with the valve seat (11), and the valve cover (12) is arranged on the upper end surface of the valve body (10). The valve core (3) is circumferentially provided with a flange, the valve seat (11) is provided with a first groove (13), a static seal is arranged in the first groove (13), in the closed state, and the flange is embedded in the first groove (13); 10. The direct stroke valve of claim 9, wherein, The valve body (10) is provided with a second groove (14), the sealing ring (1) of the valve element is embedded in the second groove (14), the second groove (14) is provided with a static seal, and the static seal is located between the sealing ring (1) of the valve element and the valve body (10); The top of the valve cover (12) is provided with a sealing cavity (15), the part of the valve rod (2) extending out of the valve cover (12) is located in the sealing cavity (15), a driving mechanism (16) is arranged above the sealing cavity (15), and the driving rod of the driving mechanism (16) extends into the sealing cavity (15) and is connected with the valve rod (2). ​

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