Check valve with detachable valve seat

Abstract

The utility model discloses a check valve with a detachable valve seat, and relates to the field of valves. The valve body is of a hollow structure with the two ends open, and a first annular step is arranged on the inner wall of the valve body. The valve seat is detachably mounted in the first groove, and a second conical surface matched with the first conical surface is arranged on the outer wall of the valve seat; the bottom wall of the valve seat abuts against the first annular step. A third groove is formed in the top wall of the valve seat, and a fourth groove communicated with the third groove is formed in the bottom wall of the valve seat; the bottom wall of the fourth groove is an inclined plane, and the inclined plane is provided with a second annular step; a rotating shaft is arranged on one side of the valve clack and rotationally connected to the side wall of the fourth groove. The valve body and the valve seat are automatically centered and sealed through cooperation of the first conical surface and the second conical surface, the sealing performance is improved, and medium leakage is prevented; the detachable design of the valve seat facilitates later maintenance and replacement, and the maintainability of equipment is improved. The integrated valve clack structure reduces the number of parts, avoids assembly deviation and improves production efficiency.

Description

Technical Field

[0001] The present application relates to the field of valve technology, and in particular to a check valve with a detachable valve seat. Background Art

[0002] Wafer check valve is a one-way valve. When working, the opening and closing parts are opened or closed automatically by the flow and force of the medium. It belongs to the automatic valve category and is mainly used in pipelines where the medium flows in one direction. Its main function is to prevent the medium from flowing back, prevent the pump and its drive motor from reversing, and prevent the discharge of fluid medium in the container.

[0003] The valve seat and valve body of traditional wafer-type check valves are integrally molded. Wear or corrosion of the valve seat necessitates complete valve body replacement, resulting in high maintenance costs and time-consuming repairs. Furthermore, the rotating mechanism of existing wafer-type check valves consists of multiple components, including the disc, rocker, nut, pin, anti-drop pin, and gasket. This not only results in a long production cycle, but also poses a risk of assembly errors, impacting valve performance. Utility Model Content

[0004] The embodiments of the present application solve the problems raised in the background art by providing a check valve with a detachable valve seat.

[0005] The embodiment of the present application provides a check valve with a detachable valve seat, comprising a valve body, a valve seat and a valve disc; the valve body is a hollow structure with openings at both ends, and the inner wall of the valve body is provided with a first annular step, dividing the hollow structure into a first groove close to the top wall of the valve body and a second groove close to the bottom wall of the valve body, the side wall of the first groove is a first conical surface; the valve seat is detachably installed in the first groove, and the outer wall of the valve seat is provided with a second conical surface matching the first conical surface; the first conical surface and the second conical surface cooperate to realize automatic centering and sealing of the valve body and the valve seat; the bottom wall of the valve seat abuts against the first annular step, and the valve seat is opened. It is fixed by two flanges arranged at both ends of the valve body; the top wall of the valve seat is provided with a third groove, and the bottom wall is provided with a fourth groove connected to the third groove; the diameter of the fourth groove is larger than that of the third groove, and its bottom wall is an inclined surface, and the inclined surface is provided with a second annular step; a rotating shaft is provided on one side of the valve disc, and the rotating shaft is rotatably connected to the side wall of the fourth groove to make the valve disc rotate around the rotating shaft; the side of the valve disc away from the rotating shaft is used to abut or disengage from the second annular step to realize the opening and closing of the check valve; the height of the second annular step toward the side of the rotating shaft is less than the height on the opposite side.

[0006] In a possible implementation, the check valve with a detachable valve seat further includes a plurality of sealing rings; a plurality of sealing grooves are axially provided on an outer wall of the valve seat; and the plurality of sealing rings are respectively disposed in corresponding sealing grooves.

[0007] In one possible implementation, the side of the valve flap away from the rotating shaft is a conical structure, and the thickness on both sides is smaller than the thickness in the middle, so that the valve flap produces a slight deformation toward the second annular step under the pressure of the medium, thereby increasing the contact force of the sealing surface formed by the valve flap and the second annular step.

[0008] In a possible implementation, a boss is provided in the middle of the side of the valve flap facing the third groove, so as to allow the valve flap to extend into the third groove during closing, thereby limiting radial displacement of the valve flap.

[0009] In a possible implementation, the cone angle of the first cone surface is 8-15°.

[0010] In a possible implementation, the sealing ring is an O-ring.

[0011] One or more technical solutions provided in the embodiments of this application have at least the following technical effects:

[0012] The check valve with a removable valve seat of the present application, when the medium flows in the forward direction, the valve disc is pushed by the medium pressure to rotate around the rotation axis and disengage the second annular step to open, allowing the medium to flow normally. When the medium flows in the reverse direction, the valve disc rotates back to abut the second annular step under the action of the reverse medium pressure and its own gravity, closing the valve, effectively preventing the medium from flowing back. Therefore, the valve body and valve seat of the present application achieve automatic centering and sealing through the cooperation of the first conical surface and the second conical surface, improving the sealing performance and preventing the leakage of the medium. The removable valve seat design facilitates subsequent maintenance and replacement, reducing the cost of use and improving the maintainability of the equipment. The asymmetric height design of the bottom wall of the fourth groove and the second annular step allows the valve disc to sensitively respond to changes in the flow direction of the medium, quickly open and close, improving the response speed and reliability, and ensuring stable operation under complex working conditions. The integrated valve disc reduces the number of parts, avoids assembly deviation, improves production efficiency, and can withstand harsh working conditions such as high pressure and large flow, maintaining stable performance during frequent opening and closing, and extending the life of the valve. When the valve seat is damaged, it can be directly disassembled and replaced for repair, reducing maintenance time and cost, improving equipment operation efficiency, and bringing significant economic benefits to the enterprise. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments of the present application. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0014] Figure 1 A schematic structural diagram of a check valve with a detachable valve seat provided in an embodiment of the present application;

[0015] Figure 2 A schematic diagram of the structure of the valve seat provided in an embodiment of the present application;

[0016] Figure 3 A schematic structural diagram of the second annular step provided in an embodiment of the present application;

[0017] Figure 4 A schematic diagram of the structure of the valve disc provided in an embodiment of the present application;

[0018] Figure 5 This is a schematic structural diagram of the rotating shaft provided in an embodiment of the present application.

[0019] Icon: 1-valve body; 11-first annular step; 12-first groove; 13-second groove; 14-first conical surface; 2-valve seat; 21-second conical surface; 22-sealing groove; 23-second annular step; 24-third groove; 25-fourth groove; 3-valve disc; 31-rotating shaft; 32-boss; 33-conical structure; 4-sealing ring. DETAILED DESCRIPTION

[0020] The following will be combined with the accompanying drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0021] In the description of the embodiments of the present application, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limitations on the present application. The terms "first", "second" and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the terms "installed", "connected" 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 a direct connection, or an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0022] The present application provides a check valve with a detachable valve seat, such as Figures 1 to 5As shown in the figure, this check valve with a removable valve seat comprises a valve body 1, a valve seat 2, and a valve disc 3. The valve body 1 is a hollow structure with openings at both ends. A first annular step 11 is provided on the inner wall of the valve body 1, dividing the hollow structure into a first groove 12 near the top wall of the valve body 1 and a second groove 13 near the bottom wall. The sidewall of the first groove 12 is a first tapered surface 14. The valve seat 2 is removably mounted within the first groove 12. Its outer wall is provided with a second tapered surface 21 that matches the first tapered surface 14. The first tapered surface 14 and the second tapered surface 21 cooperate to achieve automatic centering and sealing between the valve body 1 and the valve seat 2. The bottom wall of the valve seat 2 abuts the first annular step 11 and is secured by two flanges at each end of the valve body 1. A third groove 24 is provided on the top wall of the valve seat 2, and a fourth groove 25 is provided on the bottom wall, communicating with the third groove 24. The fourth groove 25 has a larger diameter than the third groove 24 and a sloped bottom wall with a second annular step 23. A rotation shaft 31 is provided on one side of the valve flap 3, and the rotation shaft 31 is rotatably connected to the side wall of the fourth groove 25, so that the valve flap 3 rotates around the rotation shaft 31. The valve flap 3 of the present application is an integrated structure.

[0023] The side of the valve flap 3 away from the rotating shaft 31 is used to abut or disengage from the second annular step 23 to realize the opening and closing of the check valve. The height of the second annular step 23 on the side facing the rotating shaft 31 is less than the height on the opposite side. When the medium flows in the opposite direction, the valve flap 3 rotates under the dual action of the reverse medium pressure and its own gravity until it abuts against the second annular step 23. At this time, due to the existence of this height difference, the valve flap 3 can contact the second annular step 23 in a more fitting posture during the closing process, and the sealing surface formed by the two is more tightly matched, which greatly enhances the tightness of the seal compared to the traditional planar sealing structure. This tight fit can effectively reduce the gap for medium leakage, thereby more efficiently and reliably preventing the medium from flowing back, improving the sealing performance and non-return effect of the check valve, and ensuring the safe and stable operation of the pipeline system under reverse working conditions.

[0024] It should be noted that, in the check valve with a detachable valve seat of the present application, when the medium flows in the forward direction, the valve flap 3 is pushed by the medium pressure to rotate around the rotation axis 31 to disengage from the second annular step 23 and open, allowing the medium to flow normally; when flowing in the reverse direction, the valve flap 3 rotates and abuts against the second annular step 23 under the action of the reverse medium pressure and its own gravity and closes, effectively preventing the medium from flowing back. Therefore, the valve body 1 and the valve seat 2 of the present application are automatically aligned and sealed through the cooperation of the first conical surface 14 and the second conical surface 21, thereby improving the sealing and preventing medium leakage; the detachable design of the valve seat 2 facilitates later maintenance and replacement, reduces the use cost, and improves the maintainability of the equipment; the asymmetric height design of the bottom wall slope of the fourth groove 25 and the second annular step 23 allows the valve flap 3 to sensitively respond to changes in the flow direction of the medium, open and close quickly, improve the response speed and reliability, and ensure stable operation under complex working conditions; the integrated valve flap 3 reduces the number of parts, avoids assembly deviations, improves production efficiency, and can withstand harsh working conditions such as high pressure and large flow, with stable performance during frequent opening and closing, extending the life of the valve; when the valve seat 2 is damaged, it can be directly disassembled, repaired and replaced, reducing maintenance time and cost, improving equipment operation efficiency, and bringing significant economic benefits to the enterprise.

[0025] In the embodiment of the present application, the check valve with a detachable valve seat further comprises a plurality of sealing rings 4. The outer wall of the valve seat 2 is provided with a plurality of sealing grooves 22 along the axial direction. The plurality of sealing rings 4 are respectively disposed in corresponding sealing grooves 22.

[0026] In the embodiment of the present application, the sealing ring 4 is an O-ring.

[0027] In one embodiment of the present application, two sealing grooves 22 are provided, corresponding to two sealing rings 4. Compared with existing wafer-type check valves, which are prone to media leakage under high-temperature and high-pressure conditions and have poor sealing effects using PPL or flexible graphite gasket screw plug compression structures, the present invention applies greater compression force to the valve seat 2 exerted by the bolts between the two flanges, and the first conical surface 14 and the second conical surface 21 fit more tightly, increasing the contact area between the O-ring and the two, and significantly improving the sealing effect.

[0028] In the embodiment of the present application, the side of the valve flap 3 away from the rotating shaft 31 is a conical structure 33, the thickness of which on both sides is less than the thickness in the middle, so that the valve flap 3 produces a slight deformation toward the second annular step 23 under the pressure of the medium, thereby increasing the contact force of the sealing surface formed by the valve flap 3 and the second annular step 23.

[0029] It should be noted that under the action of medium pressure, the valve disc 3 will produce a slight deformation toward the second annular step 23. This slight deformation increases the contact force of the sealing surface formed by the valve disc 3 and the second annular step 23. The increase in contact force means that the sealing surfaces fit more tightly, effectively filling any small gaps that may exist, thereby improving sealing performance and further reducing the risk of medium leakage. This ensures that the check valve can reliably prevent medium backflow under various operating conditions and guarantees the safe and stable operation of the pipeline system.

[0030] In the embodiment of the present application, a boss 32 is provided in the middle of the side of the valve flap 3 facing the third groove 24 , which is used for the valve flap 3 to extend into the third groove 24 during the closing process to limit the radial deviation of the valve flap 3 .

[0031] It should be noted that during the closing process of the valve flap 3, the boss 32 on the middle portion of the side of the valve flap 3 facing the third groove 24 extends into the third groove 24, bringing the center of gravity of the valve flap 3 closer to the sealing surface formed by the valve flap 3 and the second annular step 23. Under low pressure or operating conditions with relatively low sealing requirements, the valve flap 3 can achieve a primary seal by its own gravity, ensuring high stability during movement and allowing the valve flap 3 to accurately open or close along the predetermined trajectory.

[0032] In the embodiment of the present application, the cone angle of the first cone surface 14 is 8-15°.

[0033] It should be noted that this angle range helps to form a tighter and more reliable sealing structure, effectively enhances the fit of the sealing surface formed by the valve body 1 and the valve seat 2, improves the sealing performance, reduces the risk of medium leakage, and ensures that the valve can operate stably and reliably under various working conditions to meet actual usage needs.

[0034] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other. Each embodiment focuses on the differences from other embodiments.

[0035] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit the present application. Although the present application has been described in detail with reference to the aforementioned embodiments, a person of ordinary skill in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present application.

Claims

1. A check valve with a detachable valve seat, characterized in that: It comprises a valve body (1), a valve seat (2) and a valve disc (3); The valve body (1) is a hollow structure with openings at both ends, and the inner wall of the valve body (1) is provided with a first annular step (11), which divides the hollow structure into a first groove (12) close to the top wall of the valve body (1) and a second groove (13) close to the bottom wall of the valve body (1), and the side wall of the first groove (12) is a first conical surface (14); The valve seat (2) is detachably mounted in the first groove (12), and its outer wall is provided with a second conical surface (21) matching the first conical surface (14); the first conical surface (14) and the second conical surface (21) cooperate to achieve automatic centering and sealing of the valve body (1) and the valve seat (2); The bottom wall of the valve seat (2) abuts against the first annular step (11) and is pressed and fixed by two flanges provided at both ends of the valve body (1); The top wall of the valve seat (2) is provided with a third groove (24), and the bottom wall is provided with a fourth groove (25) communicating with the third groove (24); the diameter of the fourth groove (25) is larger than that of the third groove (24), and the bottom wall thereof is an inclined surface, and the inclined surface is provided with a second annular step (23); A rotating shaft (31) is provided on one side of the valve flap (3), and the rotating shaft (31) is rotatably connected to the side wall of the fourth groove (25), so that the valve flap (3) rotates around the rotating shaft (31); the side of the valve flap (3) away from the rotating shaft (31) is used to abut or disengage from the second annular step (23) to realize the opening and closing of the check valve; The height of the second annular step (23) on the side facing the rotation axis (31) is smaller than the height on the opposite side.

2. The check valve with a detachable valve seat according to claim 1, characterized in that: Also includes a plurality of sealing rings (4); The outer wall of the valve seat (2) is provided with a plurality of sealing grooves (22) along the axial direction; The plurality of sealing rings (4) are respectively arranged in the corresponding sealing grooves (22).

3. The check valve with a detachable valve seat according to claim 1, characterized in that: The side of the valve flap (3) away from the rotating shaft (31) is a conical structure (33), the thickness of the two sides of which is smaller than the thickness of the middle part, so that the valve flap (3) produces a slight deformation toward the second annular step (23) under the pressure of the medium, thereby increasing the contact force of the sealing surface formed by the valve flap (3) and the second annular step (23).

4. The check valve with a detachable valve seat according to claim 1, characterized in that: A boss (32) is provided in the middle of the side of the valve flap (3) facing the third groove (24), which is used for the valve flap (3) to extend into the third groove (24) during the closing process, thereby limiting the radial deviation of the valve flap (3).

5. The check valve with a detachable valve seat according to claim 1, characterized in that: The cone angle of the first cone surface (14) is 8-15°.

6. The check valve with a detachable valve seat according to claim 2, characterized in that: The sealing ring (4) is an O-ring.

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