A type of lift check valve

Abstract

This application relates to a lift-type check valve, belonging to the technical field of valves. It includes a valve body and a valve cover with an opening on the upper side of the valve body. The valve body has flow channels communicating with the outside at both ends. A valve seat located below the valve cover is fixed to the inner wall of the valve body, and a valve plate located above the valve seat is slidably mounted thereon. A guide sleeve is fixed to the inner wall of the valve cover. A positioning rod that slides into the guide sleeve is fixed to the side of the valve plate away from the valve seat. A positioning protrusion is fixed to the opening edge of the valve seat facing the valve plate. An elastic sealing ring that can abut against the positioning protrusion is embedded on the side of the valve plate facing the valve seat. A spring is sleeved on the outer periphery of the guide sleeve. In this application, the elastic sealing ring embedded on the side of the valve plate facing the valve seat allows it to tightly abut against the positioning protrusion on the opening edge of the valve seat, while the spring allows the valve plate to quickly and smoothly descend onto the valve seat when the medium stops flowing.

Description

Technical Field

[0001] This application relates to the technical field of valves, and in particular to a lift check valve. Background Technology

[0002] A check valve, also known as a non-return valve, one-way valve, backflow valve, or isolation valve, is a type of valve that automatically opens and closes based on the force generated by the flow of the medium in the pipeline. Its core function is to prevent backflow of the medium, protect the pump and its drive motor from reverse rotation, and ensure the safe release of the medium from the container. Check valves have a long history of development, and with technological advancements, their structure has been continuously optimized, and their performance has been continuously improved.

[0003] In related technologies, a lift-type check valve includes a valve body, a valve cover for sealing the upper opening of the valve body, and a valve seat formed within the valve body. The valve seat is arranged horizontally, and a valve disc is slidably mounted vertically above the valve seat within the valve body; the valve disc slides along the vertical centerline of the valve body. When the medium flows downstream, the valve disc opens due to the thrust of the medium; when the medium stops flowing, the valve disc falls onto the valve seat due to its own weight, thereby preventing the backflow of the medium.

[0004] Because of the reciprocating movement of the valve disc, the valve disc and the valve seat will frequently collide. After a period of time, the contact surfaces of the valve disc and the valve seat may not fit tightly, so the sealing performance cannot be guaranteed by the valve disc's own weight. Specifically, when this gate valve is used, the medium may leak from the contact gap in the reverse direction, which indicates room for improvement. Summary of the Invention

[0005] The purpose of this application is to provide a lift-type check valve to solve the problem that the sealing performance between the valve disc and the valve seat may decrease and leakage may occur after the above-mentioned check valve has been used for a long time.

[0006] The lift-type check valve provided in this application adopts the following technical solution:

[0007] A lift-type check valve includes a valve body and a valve cover with an opening on the upper side of the valve body. The valve body has flow channels with both ends communicating with the outside. A valve seat located below the valve cover is fixed on the inner wall of the valve body, and a valve plate located above the valve seat is slidably mounted thereon. A guide sleeve is fixed on the inner wall of the valve cover. A positioning rod that slides into the guide sleeve is fixed on the side of the valve plate away from the valve seat. A positioning protrusion is fixed on the opening edge of the valve seat facing the valve plate. An elastic sealing ring that can abut against the positioning protrusion is embedded on the side of the valve plate facing the valve seat. A spring is sleeved on the outer periphery of the guide sleeve, and the two ends of the spring abut against the sides of the valve cover and the valve plate that are close to each other.

[0008] By adopting the above technical solution, an elastic sealing ring is embedded on the side of the valve plate facing the valve seat, allowing it to tightly abut against the positioning protrusion on the edge of the valve seat opening, thereby enhancing the sealing effect. Simultaneously, the design of the guide sleeve and positioning rod ensures the stability of the valve plate during movement, preventing poor sealing due to shaking. Furthermore, the spring design allows the valve plate to quickly and smoothly descend onto the valve seat when the medium flow stops, further guaranteeing the reliability of the seal.

[0009] Optionally, two connecting rods are hinged to each other on the upper side of the valve cover. A support rod is vertically fixed to the end of the connecting rod away from the valve cover and facing the valve body. A support plate is fixed to the end of the support rod away from the connecting rod. The valve cover is provided with a control component that rotates the connecting rod to a fixed state of being in contact with the upper side of the valve cover. When the connecting rod is rotated to a state of being in contact with the upper side of the valve cover, the support plate can be flush with the bottom edge of the valve body away from the valve cover.

[0010] By adopting the above technical solution, when needed, the connecting rod can be rotated to fit against the upper side of the valve cover by the control component, and the support plate can be flush with the bottom edge of the valve body, thereby providing stable support for the valve. This design enhances the stability of the valve during installation or maintenance.

[0011] Optionally, the support plate is provided with several casters on the side away from the support rod.

[0012] By adopting the above technical solutions, these casters allow the valves to slide easily on the ground when they need to be moved or repositioned, without relying on manual lifting or heavy machinery handling, thus greatly reducing the labor intensity of workers. At the same time, the casters also enable faster and more accurate positioning of the valves during installation, maintenance, or repair, improving work efficiency.

[0013] Optionally, the control component includes a central rod rotatably disposed in the middle of the upper side of the valve cover. The central rod is rotatable about its own axis, and a fixing plate is fixedly disposed on the end face of the central rod away from the valve cover. When the connecting rod rotates towards the valve body to the state of abutting against the upper side of the valve cover, the fixing plate can rotate with the central rod to a state of fitting against the upper side of the connecting rod in this state. A fixing bolt is provided on the upper part of the valve cover to fix the fixing plate to the connecting rod in this state.

[0014] By adopting the above technical solution, when the connecting rod rotates to abut against the upper side of the valve cover, the fixing plate can rotate with the central rod to fit against the upper side of the connecting rod, and be firmly fixed to the connecting rod by fixing bolts. This design is not only simple in structure and easy to operate, but also effectively prevents the connecting rod from shaking or falling off under force, thereby ensuring the stability and reliability of the support plate.

[0015] Optionally, the fixing plate is provided with an elastic snap-fit ​​component, and the connecting rod is provided with a positioning groove for the elastic snap-fit ​​component to snap into.

[0016] By adopting the above technical solution, the elastic snap-fit ​​component added to the fixing plate cooperates with the positioning groove on the connecting rod, providing a more convenient and efficient way to fix the lift-type check valve. As the fixing plate rotates with the central rod until it is in contact with the connecting rod, the elastic snap-fit ​​component automatically engages in the positioning groove, achieving initial fixing and positioning without the need for additional alignment or adjustment.

[0017] Optionally, the support rod can rotate with the connecting rod to a vertically upward state, and the fixing plate rotates to a state perpendicular to the connecting rod when the support rod is in this state. The fixing plate is provided with a locking member to fix the support rod in this state.

[0018] By adopting the above technical solution, when ground support is not required, the support rod and support plate can be rotated upwards and retracted, thereby reducing the overall size of the valve and facilitating storage and transportation. On uneven terrain during short-distance travel, the two support plates located above the valve cover can act as "handles," making it easy to move the check valve directly.

[0019] Optionally, the locking element includes a locking rod hinged to the side of the fixing plate away from the valve cover, and a locking block is fixed on the outer periphery of the end of the locking rod away from the fixing plate; the locking block has a locking notch, and when the locking block rotates with the locking rod, the support rod can be interference-engaged into the locking notch.

[0020] By adopting the above technical solution, the locking rod is hinged to the fixed plate, allowing the support rod to be interference-locked into the locking notch as the locking block rotates, thus achieving a secure fixation. This design is not only easy to operate but also provides stable and reliable fixation, effectively preventing the support rod from swaying or falling off in a vertical position. Furthermore, the interference-locking mechanism of the locking notch also has a certain self-locking function, resisting external impacts to a certain extent and ensuring the safety of the support rod.

[0021] Optionally, the locking block is fixed with an elastic pad on the inner wall of the locking notch.

[0022] By adopting the above technical solution, the elastic pad can increase the friction between the locking block and the support rod, making the support rod more stable after it is engaged in the locking notch, and less likely to loosen or fall off due to external forces. Secondly, the elastic pad has a certain buffering effect, which can reduce impact and wear when the support rod is engaged or disengaged from the locking notch, and extend the service life of the locking parts and the support rod.

[0023] Optionally, an indicator rod is coaxially fixed on the side of the positioning rod away from the valve plate, a first through hole is opened on the valve cover for the indicator rod to pass through, and a second through hole is opened on the center rod and the fixing plate for the indicator rod to pass through; a first sealing ring is embedded in the inner wall of the first through hole, and the end of the indicator rod away from the positioning rod passes through the first through hole and the second through hole and extends to the top of the valve cover.

[0024] By adopting the above technical solution, operators can clearly observe the position and status of the valve plate. Simultaneously, the first sealing ring effectively prevents leakage of the medium or external impurities from the first through-hole, ensuring the valve's sealing performance. Furthermore, the indicator rod extends above the valve cover, facilitating observation and operation by operators, improving work efficiency and safety.

[0025] Optionally, when the two support plates are in a vertically upward state, an extension plate located above the indicator rod is fixed on the side of each support plate that is close to each other, and the side of the two extension plates that are close to each other in this state abut against each other.

[0026] By adopting the above technical solution, the extension plate is located above the indicator rod, which will not interfere with the visual indication function of the indicator rod and ensure that the staff can clearly observe the position and status of the valve plate; it can also protect the top of the indicator rod by extending the plate, reducing the possibility of external dust adhering to the indicator rod from the top of the valve cover; in addition, the setting of the extension plate also makes it easier for the staff to hold and apply force when handling or moving the valve, improving the convenience and safety of operation.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. An elastic sealing ring is embedded on the side of the valve plate facing the valve seat, allowing it to tightly abut against the positioning protrusion on the edge of the valve seat opening, thereby enhancing the sealing effect. Simultaneously, the design of the guide sleeve and positioning rod ensures the stability of the valve plate during movement, preventing poor sealing due to shaking. Furthermore, the spring design allows the valve plate to quickly and smoothly descend onto the valve seat when the medium flow stops, further guaranteeing the reliability of the seal.

[0029] 2. When needed, the connecting rod can be rotated to fit against the upper side of the valve cover using the control components, and the support plate can be aligned with the bottom edge of the valve body, thus providing stable support for the valve. This design enhances the stability of the valve during installation or maintenance. The casters allow the valve to slide easily on the ground when it needs to be moved or repositioned, without relying on manual lifting or heavy machinery handling, greatly reducing the workload of workers.

[0030] 3. When ground support is not required, the support rod and support plate can be rotated upwards and retracted, thereby reducing the overall size of the valve and facilitating storage and transportation. On uneven terrain during short-distance travel, the two support plates located above the valve cover can act as "handles," making it easy to move the check valve directly. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application;

[0033] Figure 2 This is a cross-sectional structural diagram of Embodiment 1 of this application;

[0034] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle;

[0035] Figure 4 This is a schematic diagram of the overall structure of Embodiment 2 of this application;

[0036] Figure 5 This is a partial cross-sectional view of Embodiment 2 of this application illustrating the installation and fit of the indicator rod;

[0037] Figure 6 yes Figure 5 Enlarged schematic diagram of part B in the middle;

[0038] Figure 7 This is a schematic diagram of the structure of Embodiment 2 of this application, showing the support rod in a vertically upward state;

[0039] Figure 8 This is a partial cross-sectional structural diagram illustrating the installation and mating of the locking component in Embodiment 2 of this application.

[0040] In the diagram, 1. Valve body; 11. Flow channel; 111. Medium inlet; 112. Medium outlet; 12. Valve seat; 13. Positioning convex ring; 2. Valve cover; 21. Guide sleeve; 22. Spring; 23. First through hole; 24. First sealing ring; 3. Valve plate; 31. Positioning rod; 32. Elastic sealing ring; 33. Indicator rod; 4. Support assembly; 41. Connecting rod; 411. Positioning groove; 42. Support rod; 43. Support plate; 431. Extension plate; 44. Moving wheel; 5. Control component; 51. Center rod; 511. Second through hole; 52. Fixing plate; 521. Placement groove; 53. Fixing bolt; 531. Wing bolt; 54. Elastic snap-fit ​​component; 541. Compression spring; 542. Arc-shaped protrusion; 6. Locking component; 61. Locking rod; 62. Locking block; 621. Locking notch; 63. Elastic pad. Detailed Implementation

[0041] The present application will be further described in detail below with reference to all the accompanying drawings.

[0042] Example 1:

[0043] Reference Figure 1 and Figure 2 A lift-type check valve includes a valve body 1 and a valve cover 2 installed on the upper opening of the valve body 1. The valve body 1 is provided with flow channels 11 at both ends communicating with the outside. The openings of the two flow channels 11 are a medium inlet 111 and a medium outlet 112, respectively. The check valve is a small valve.

[0044] A valve seat 12 is integrally formed on the inner wall of the valve body 1, located below the valve cover 2. A valve plate 3 is slidably mounted inside the valve body 1, located above the valve seat 12. When the transported medium enters from the medium inlet 111, it is impacted by the valve plate 3 covering the valve seat 12 and finally discharged from the medium outlet 112. When the transport stops, the valve plate 3 seals the opening of the valve seat 12 by its own weight, and the check valve is in a closed state at this time.

[0045] Reference Figure 2 and Figure 3 A guide sleeve 21 is integrally formed on the inner wall of the valve cover 2, and a positioning rod 31 that slides into the guide sleeve 21 is integrally formed on the side of the valve plate 3 away from the valve seat 12; a positioning protrusion ring 13 made of graphene material is fixed on the opening edge of the valve seat 12 facing the valve plate 3, and an elastic sealing ring 32 made of rubber material is fixed by glue on the side of the valve plate 3 facing the valve seat 12.

[0046] A spring 22 is fitted on the outer periphery of the guide sleeve 21. The two ends of the spring 22 are respectively pressed against the sides of the valve cover 2 and the valve plate 3 that are close to each other. When the medium stops entering from the medium inlet 111, under the pressure of the valve plate 3 itself and the spring 22 on the valve plate 3, the elastic sealing ring 32 is pressed against the positioning protrusion, thereby ensuring the sealing performance when the valve is closed.

[0047] The implementation principle of this application embodiment is as follows:

[0048] When the medium flows in from the inlet, the fluid impact pushes the valve plate 3 upward against the elastic force of the spring 22, causing the elastic sealing ring 32 to disengage from the graphene positioning convex ring 13, and the valve port opens to allow the medium to flow. When the medium stops input, the valve plate 3 moves downward under the combined action of its own weight and the compression force of the spring 22. The elastic sealing ring 32 fits tightly with the positioning convex ring 13, and together with the guide sleeve 21 to linearly guide and constrain the positioning rod 31, a double sealing structure is formed to ensure that the valve seat 12 is completely closed, effectively preventing the medium from flowing back and realizing the high reliability of the one-way shut-off function of the small valve.

[0049] Example 2:

[0050] Reference Figure 4 and Figure 5 The difference between this embodiment and Embodiment 1 is that a support assembly 4 is provided on the outside of the valve body 1. The support assembly 4 includes two connecting rods 41 that are hinged to the upper side of the valve cover 2. A support rod 42 facing the valve body 1 is vertically fixed at the end of the connecting rod 41 away from the valve cover 2. A support plate 43 is fixed at the end of the support rod 42 away from the connecting rod 41. A plurality of movable wheels 44 are installed on the side of the support plate 43 away from the support rod 42.

[0051] The valve cover 2 is equipped with a control component 5 that rotates the connecting rod 41 to a fixed state that is in contact with the upper side of the valve cover 2. When the connecting rod 41 is rotated to a state that is in contact with the upper side of the valve cover 2, the support plate 43 can be flush with the bottom edge of the valve body 1 away from the valve cover 2. In this state, the moving wheel 44 is in contact with the ground, which can not only provide auxiliary support for the valve body 1 before the valve is installed, but also facilitate the operator to drag the check valve for a short distance.

[0052] Refer to 4 and Figure 5 The control component 5 includes a central rod 51 rotatably disposed in the middle of the upper side of the valve cover 2. The central rod 51 is rotatable about its own axis. A fixing plate 52 is fixed on the end face of the central rod 51 away from the valve cover 2, wherein the fixing plate 52 is parallel to the upper side of the valve cover 2.

[0053] When the connecting rod 41 rotates towards the valve body 1 and abuts against the upper side of the valve cover 2, the fixing plate 52 can rotate with the center rod 51 to fit against the upper side of the connecting rod 41 in this state; and the valve cover 2 is provided with fixing bolts 53 on the top to fix the fixing plate 52 to the connecting rod 41 in this state.

[0054] The fixing plate 52 has a fixing through hole, and the connecting rod 41 has a fixing screw hole that can coincide with the fixing through hole. The fixing bolt 53 is a wing bolt 531 that can pass through the fixing through hole and be screwed into the fixing screw hole, thereby realizing the limiting and fixing of the connecting rod 41 in this state.

[0055] Reference Figure 5 and Figure 6 The fixing plate 52 is provided with an elastic snap-fit ​​member 54, wherein the elastic snap-fit ​​member 54 includes a compression spring 541 and an arc-shaped protrusion 542. The side of the fixing plate 52 facing the valve cover 2 is provided with a placement groove 521 for the compression spring 541 and the arc-shaped protrusion 542 to be placed. The compression spring 541 presses one side of the arc-shaped protrusion 542, causing a part of the arc-shaped protrusion 542 to protrude from the opening of the placement groove 521. The outer side of the protruding part is an arc surface, and the arc length corresponding to the arc surface is a minor arc.

[0056] The connecting rod 41 is provided with a positioning groove 411 for the protruding part of the arc-shaped protrusion 542 to be inserted; when the fixing through hole coincides with the fixing screw hole, the elastic snap fastener 54 is just inserted into the positioning groove 411. The snap-fit ​​feeling when it is inserted reminds the staff that the fixing through hole and the fixing screw hole should coincide, which facilitates the installation of the fixing bolt 53.

[0057] Reference Figure 7 and Figure 8 The fixing plate 52 is provided with a locking component 6. The locking component 6 includes two locking rods 61 that are hinged to each other on the side of the fixing plate 52 away from the valve cover 2. A locking block 62 is integrally formed on the outer periphery of the end of the locking rod 61 away from the fixing plate 52. A locking notch 621 is provided on the locking block 62, and an elastic pad 63 of rubber material is glued to the inner wall of the locking notch 621 of the locking block 62.

[0058] When it is necessary to rotate the support rod 42 with the connecting rod 41 to a vertically upward state, the fixing plate 52 is rotated in advance to a state perpendicular to the length direction of the connecting rod 41 in this state of the support rod 42, and then the support rod 42 is flipped; then the operator controls the locking rod 61 to rotate, so that the support rod 42 is interference-locked into the locking notch 621. At this time, the elastic pad 63 is pressed against the outer peripheral surface of the support rod 42, thereby fixing the two vertically upward support rods 42.

[0059] When the check valve needs to be transported over a long distance, this configuration facilitates the packing and transport of the check valve; when the road surface is uneven during short-distance travel, the two support plates 43 located above the valve cover 2 can act as "handles" to facilitate the direct handling of the check valve.

[0060] Reference Figure 5An indicator rod 33 is coaxially fixed on the side of the positioning rod 31 away from the valve plate 3, and a first through hole 23 is coaxially opened on the valve cover 2 for the indicator rod 33 to pass through. A second through hole 511 is coaxially opened on the center rod 51 and the fixing plate 52 for the indicator rod 33 to pass through. A first sealing ring 24 made of rubber is embedded in the inner wall of the first through hole 23. The end of the indicator rod 33 away from the positioning rod 31 passes through the first through hole 23 and the second through hole 511 and extends to the top of the valve cover 2.

[0061] When the check valve is installed on the pipeline, the operator can judge the opening and closing status of the check valve by observing the upward movement of the indicator rod 33, which is more intuitive. In other embodiments, an additional sealing ring is also embedded in the inner wall of the first through hole 23 to enhance the corresponding sealing performance, which will not be described in detail here.

[0062] Reference Figure 7 When the two support rods 42 are in a vertically upward state, an extension plate 431 located above the indicator rod 33 is fixed on the side of the two support plates 43 that are close to each other, and the side of the two extension plates 431 that are close to each other abut against each other in this state; thereby protecting the top of the indicator rod 33 through the extension plate 431, reducing the possibility of external dust adhering to the indicator rod 33 from the top of the valve cover 2.

[0063] The implementation principle of this application embodiment is as follows:

[0064] In this check valve, a connecting rod 41 is hinged to the upper side of the valve cover 2, and a support rod 42 and a support plate 43 are provided at the end of the connecting rod 41 away from the valve cover 2, along with a moving wheel 44. This provides auxiliary support for the valve body 1 before valve installation and facilitates short-distance movement. Simultaneously, the connecting rod 41 is rotated to a position flush with the upper side of the valve cover 2 using control components 5 (including a center rod 51, a fixing plate 52, and fixing bolts 53) to ensure that the support plate 43 is flush with the bottom edge of the valve body 1 and that the moving wheel 44 is in contact with the ground. Furthermore, an elastic snap-fit ​​component 54 and a locking component 6 are designed to indicate the alignment of the fixing through hole and the fixing screw hole, and to fix the vertically upward support rod 42, respectively. The indicator rod 33 facilitates the observation of the check valve's opening and closing status by the operator. When the two support rods 42 are vertically upward, the extension plate 431 protects the area above the indicator rod 33 from dust accumulation.

[0065] Unless otherwise defined, the terms or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms "first," "second," "third," and similar words used in this application do not indicate any order, quantity, or importance, but are merely used to distinguish different components. The terms "a" or "one," and similar words do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms "comprising," "including," and similar words mean that the element or object preceding "comprising" encompasses the element or object listed following "comprising" or "including," and their equivalents, but do not exclude other elements or objects. "Above," "below," "left," "right," etc., are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0066] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A lift-type check valve, comprising a valve body (1) and a valve cover (2) with an opening on the upper side of the valve body (1), wherein the valve body (1) has a flow channel (11) communicating with the outside at both ends, and a valve seat (12) is fixedly disposed on the inner wall of the valve body (1) below the valve cover (2), and a valve plate (3) is slidably disposed above the valve seat (12); characterized in that, A guide sleeve (21) is fixedly provided on the inner wall of the valve cover (2), and a positioning rod (31) that slides into the guide sleeve (21) is fixedly provided on the side of the valve plate (3) away from the valve seat (12); A positioning protrusion ring (13) is fixedly provided on the opening edge of the valve seat (12) facing the valve plate (3), and an elastic sealing ring (32) that can abut against the positioning protrusion ring (13) is embedded on the side of the valve plate (3) facing the valve seat (12); a spring (22) is sleeved on the outer periphery of the guide sleeve (21), and the two ends of the spring (22) abut against the sides of the valve cover (2) and the valve plate (3) that are close to each other. Two connecting rods (41) are hinged to each other on the upper side of the valve cover (2). A support rod (42) facing the valve body (1) is vertically fixed at the end of the connecting rod (41) away from the valve cover (2). A support plate (43) is fixed at the end of the support rod (42) away from the connecting rod (41). The valve cover (2) is provided with a control component (5) to rotate the connecting rod (41) to a state of contact with the upper side of the valve cover (2). When the connecting rod (41) is rotated to a state of contact with the upper side of the valve cover (2), the support plate (43) can be flush with the bottom edge of the valve body (1) away from the valve cover (2). The support plate (43) is provided with several moving wheels (44) on the side away from the support rod (42); the control component (5) includes a central rod (51) rotatably disposed in the middle of the upper side of the valve cover (2), the central rod (51) can rotate around its own axis, and a fixing plate (52) is fixedly provided on the end face of the central rod (51) away from the valve cover (2); when the connecting rod (41) rotates towards the valve body (1) to the state of abutting the upper side of the valve cover (2), the fixing plate (52) can rotate with the central rod (51) to the state of fitting against the upper side of the connecting rod (41) in this state, and a fixing bolt (53) is provided on the upper part of the valve cover (2) to fix the fixing plate (52) in this state to the connecting rod (41); The support rod (42) can rotate with the connecting rod (41) to a vertically upward state. When the support rod (42) is in this state, the fixing plate (52) rotates to a state perpendicular to the connecting rod (41). The fixing plate (52) is provided with a locking member (6) to fix the support rod (42) in this state.

2. The lift-type check valve according to claim 1, characterized in that, The fixing plate (52) is provided with an elastic snap-fit ​​member (54), and the connecting rod (41) is provided with a positioning groove (411) for the elastic snap-fit ​​member (54) to be snapped into.

3. A lift-type check valve according to claim 1, characterized in that, The locking member (6) includes a locking rod (61) hinged to the side of the fixing plate (52) away from the valve cover (2), and a locking block (62) is fixed on the outer periphery of the end of the locking rod (61) away from the fixing plate (52); The locking block (62) has a locking notch (621) and when the locking block (62) rotates with the locking rod (61), the support rod (42) can be interference-fitted into the locking notch (621).

4. A lift-type check valve according to claim 3, characterized in that, The locking block (62) has an elastic pad (63) fixed on the inner wall of the locking notch (621).

5. A lift-type check valve according to claim 1, characterized in that, The positioning rod (31) is coaxially fixed with an indicator rod (33) on the side away from the valve plate (3). The valve cover (2) has a first through hole (23) for the indicator rod (33) to pass through. The center rod (51) and the fixing plate (52) have a second through hole (511) for the indicator rod (33) to pass through. A first sealing ring (24) is embedded on the inner wall of the first through hole (23), and the end of the indicator rod (33) away from the positioning rod (31) extends through the first through hole (23) and the second through hole (511) to the top of the valve cover (2).

6. A lift-type check valve according to claim 5, characterized in that, When the two support plates (43) are in a vertically upward state, an extension plate (431) located above the indicator rod (33) is fixed on the side of each other. The side of the two extension plates (431) in this state abuts against each other.

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