Lifting type check valve

Abstract

The invention relates to the technical field of valves, in particular to a lifting type check valve which comprises a valve body and a valve deck installed at an opening in the upper side of the valve body, a flow channel with the two ends communicated with the outside is formed in the valve body, a valve seat located below the valve deck is fixedly arranged on the inner wall of the valve body, and a valve plate located above the valve seat is arranged on the inner wall of the valve body in a sliding mode. A guide sleeve is fixedly arranged on the inner wall of the valve deck, and a positioning rod inserted into the guide sleeve in a sliding mode is fixedly arranged on the side face, away from the valve seat, of the valve plate. A positioning convex ring is fixedly arranged on the opening edge, facing the valve plate, of the valve seat, and an elastic sealing ring which can abut against the positioning convex ring is embedded in the side face, facing the valve seat, of the valve plate; the periphery of the guide sleeve is sleeved with a spring. According to the valve, the elastic sealing ring is embedded in the side face, facing the valve seat, of the valve plate, so that the elastic sealing ring can be tightly connected with the positioning convex ring on the edge of the opening of the valve seat in an abutting mode, and the valve plate can rapidly and stably fall on the valve seat when a medium stops flowing due to the arrangement of the spring.

Description

Technical Field

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

[0002] A check valve, also known as a non-return valve, one-way valve, reflux valve or isolation valve, is a valve that automatically opens and closes by the force generated by the flow of the medium in the pipeline. Its core function is to prevent the medium from flowing back, while protecting the pump and its drive motor from the impact of reverse rotation, and ensuring the safe discharge of the medium in the container. The development history of the check valve is long, and with the advancement of technology, its structure has been continuously optimized and its performance has been increasingly improved.

[0003] In the related art, a lifting check valve includes a valve body, a valve cover for blocking the upper opening of the valve body, and a valve seat formed in the valve body, wherein the valve seat is arranged in the horizontal direction, and a valve disc is also slidably arranged in the valve body in the vertical direction and located above the valve seat; the valve disc slides along the vertical center line of the valve body. When the medium flows downstream, the valve disc is opened by the thrust of the medium; when the medium stops flowing, the valve disc falls on the valve seat by its own weight, thereby preventing the medium from flowing back.

[0004] Due to the up and down reciprocating movement of the valve disc, the valve disc and the valve seat will frequently collide with each other. After a period of time, the abutting surfaces of the valve disc and the valve seat may not fit tightly, resulting in the inability to guarantee the sealing performance by relying on the valve disc's own weight. Specifically, when the stop valve is used, the medium may leak back from the abutting gap, and there is room for improvement. Summary of the invention

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

[0006] The present application provides a lifting check valve adopting the following technical solution: A lifting check valve comprises a valve body and a valve cover installed at an opening on the upper side of the valve body, the valve body is provided with flow channels whose two ends are connected to the outside, a valve seat located below the valve cover is fixedly provided on the inner wall of the valve body, and a valve plate located above the valve seat is slidably provided; a guide sleeve is fixedly provided on the inner wall of the valve cover, and a positioning rod slidably inserted into the guide sleeve is fixedly provided on the side of the valve plate away from the valve seat; a positioning convex ring is fixedly provided on the opening edge of the valve seat facing the valve plate, and an elastic sealing ring capable of pressing against the positioning convex ring 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 are respectively pressed against the side surfaces of the valve cover and the valve plate close to each other.

[0007] By adopting the above technical solution, an elastic sealing ring is embedded on the side of the valve plate facing the valve seat, so that it can be closely abutted against the positioning convex ring on the edge of the valve seat opening, thereby enhancing the sealing effect. At the same time, the design of the guide sleeve and the positioning rod ensures the stability of the valve plate during movement, avoiding poor sealing caused by shaking. In addition, the setting of the spring enables the valve plate to land on the valve seat quickly and smoothly when the medium stops flowing, further ensuring the reliability of the seal.

[0008] Optionally, two connecting rods are relatively hinged on the upper side surface of the valve cover, and a support rod facing the valve body is vertically fixed to the end of the connecting rod away from the valve cover, and a support plate is fixed to the end of the support rod away from the connecting rod; a control component is provided on the valve cover for rotating the connecting rod to a state of being in contact with the upper side surface of the valve cover, and the support plate can be flush with the bottom edge of the valve body away from the valve cover when the connecting rod is rotated to a state of being in contact with the upper side surface of the valve cover.

[0009] By adopting the above technical solution, when necessary, the connecting rod can be rotated through the control member to a state where it is in contact with the upper side of the valve cover, and the support plate can be made 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.

[0010] Optionally, a plurality of moving wheels are arranged on the side of the support plate away from the support rod.

[0011] By adopting the above technical solution, these moving wheels allow the valve to slide easily on the ground when it needs to be moved or adjusted, without relying on manual lifting or heavy machinery handling, thus greatly reducing the labor intensity of the staff. At the same time, the setting of the moving wheels also enables the valve to be positioned more quickly and accurately during installation, maintenance or overhaul, thereby improving work efficiency.

[0012] Optionally, the fixing member includes a center rod rotatably arranged in the middle of the upper side surface of the valve cover, the center rod can rotate around its own axis, and a fixing plate is fixedly provided on the end surface of the center rod away from the valve cover; when the connecting rod rotates in a direction close to the valve body to a state in which it abuts the upper side surface of the valve cover, the fixing plate can rotate with the center rod to a state in which it is in contact with the upper side surface of the connecting rod in this state, and a fixing bolt is provided above the valve cover to fix the fixing plate in this state to the connecting rod.

[0013] 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 center rod to fit the upper side of the connecting rod, and is firmly fixed to the connecting rod by fixing bolts. This design is not only simple in structure and easy to operate, but also can effectively prevent the connecting rod from shaking or falling off when subjected to force, thereby ensuring the stability and reliability of the support plate.

[0014] Optionally, an elastic clamping piece is provided on the fixing plate, and a positioning groove for the elastic clamping piece to be clamped into is opened on the connecting rod.

[0015] By adopting the above technical solution, the elastic clamping piece added to the fixing plate cooperates with the positioning groove on the connecting rod, providing a more convenient and efficient way to fix the lifting check valve. When the fixing plate rotates with the center rod to fit with the connecting rod, the elastic clamping piece can automatically snap into the positioning groove to achieve preliminary fixation and positioning without additional alignment or adjustment.

[0016] Optionally, the support rod can rotate with the connecting rod to a vertically upward state, and the fixed plate rotates to a state perpendicular to the connecting rod when the support rod is in this state, and the fixed plate is provided with a locking member for fixing the support rod in this state.

[0017] By adopting the above technical solution, when the support plate is not needed for ground support, the support rod and the support plate can be rotated upward and retracted, thereby reducing the overall volume of the valve and facilitating storage and transportation. When the road surface is rough during short-distance movement, the two support plates located above the valve cover can act as "handles" to facilitate direct transportation of the check valve.

[0018] Optionally, the locking member includes a locking rod hinged on 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; a locking notch is provided on the locking block, and when the locking block rotates with the locking rod, the support rod can be interference fit into the locking notch.

[0019] By adopting the above technical solution, the locking rod is hinged on the fixing plate, and the support rod can be inserted into the locking notch by interference fit as the locking block rotates, thereby achieving a firm fixing effect. This design is not only easy to operate, but also stable and reliable in fixing, and can effectively prevent the support rod from shaking or falling off in a vertical state. At the same time, the interference fit of the locking notch also has a certain self-locking function, which can resist external force impact to a certain extent and ensure the safety of the support rod.

[0020] Optionally, the locking block is fixedly provided with an elastic pad on the inner wall of the locking notch.

[0021] 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 being inserted into the locking notch and not easy to loosen or fall off due to external force. Secondly, the elastic pad has a certain buffering effect, which can reduce the impact and wear when the support rod is inserted into or pulled out of the locking notch, thereby extending the service life of the locking piece and the support rod.

[0022] 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 fixed plate for the indicator rod to pass through; a first sealing ring is embedded on 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 then extends to the top of the valve cover.

[0023] By adopting the above technical solution, the staff can clearly observe the position status of the valve plate. At the same time, the setting of the first sealing ring effectively prevents the leakage of the medium or external impurities from the first through hole, ensuring the sealing performance of the valve. In addition, the indicator rod extends above the valve cover, which is convenient for the staff to observe and operate, and improves work efficiency and safety.

[0024] Optionally, the two support plates are both provided with an extension plate located above the indicator rod on the sides close to each other when the two support rods are in a vertically upward state, and the sides of the two extension plates close to each other in this state abut against each other.

[0025] 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, ensuring that the staff can clearly observe the position status of the valve plate; the extension plate can also be used to protect the top of the indicator rod, reducing the possibility of external dust adhering to the indicator rod from above the valve cover; in addition, the setting of the extension plate also makes it easier for the staff to hold and apply force when carrying or moving the valve, thereby improving the convenience and safety of operation.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. An elastic sealing ring is embedded on the side of the valve plate facing the valve seat, so that it can be closely abutted against the positioning convex ring on the edge of the valve seat opening, thereby enhancing the sealing effect. At the same time, the design of the guide sleeve and the positioning rod ensures the stability of the valve plate during movement and avoids poor sealing caused by shaking. In addition, the setting of the spring enables the valve plate to land on the valve seat quickly and smoothly when the medium stops flowing, further ensuring the reliability of the seal.

[0027] 2. When necessary, the connecting rod can be rotated to fit the upper side of the valve cover through the control part, 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. The moving wheels allow the valve to slide easily on the ground when it needs to be moved or adjusted, without relying on manual lifting or heavy machinery, thus greatly reducing the labor intensity of the staff.

[0028] 3. When the support plate is not needed for ground support, the support rod and support plate can be turned upward and retracted, thereby reducing the overall volume of the valve and facilitating storage and transportation. When the road surface is rough for short-distance movement, the two support plates above the valve cover can act as "handles" to facilitate direct transportation of the check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 It is a schematic diagram of the overall structure of Example 1 of the present application; Figure 2 is a schematic cross-sectional structural diagram of Example 1 of the present application; Figure 3 yes Figure 2 A magnified schematic diagram of part A; Figure 4 It is a schematic diagram of the overall structure of Example 2 of the present application; Figure 5 It is a partial cross-sectional structural schematic diagram of the installation and matching of the indicator rod in Example 2 of the present application; Figure 6 yes Figure 5 A magnified schematic diagram of part B; Figure 7 This is a schematic diagram of the structure of the embodiment 2 of the present application when the support rod is in a vertically upward state; Figure 8 It is a schematic diagram of the partial cross-sectional structure of the locking member installation cooperation embodied in Example 2 of the present application.

[0031] In the figure, 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 member; 51, center rod; 511, second through hole; 52, fixing plate; 521, placement groove; 53, fixing bolt; 531, butterfly bolt; 54, elastic clamping member; 541, compression spring; 542, arc convex block; 6, locking member; 61, locking rod; 62, locking block; 621, locking notch; 63, elastic pad. DETAILED DESCRIPTION

[0032] The present application is further described in detail below in conjunction with all the accompanying drawings.

[0033] Embodiment 1: Reference Figure 1 and Figure 2 A lifting check valve comprises a valve body 1 and a valve cover 2 installed at an opening on the upper side of the valve body 1. A flow channel 11 is arranged in the valve body 1 with both ends connected to 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; A valve seat 12 located below the valve cover 2 is integrally formed on the inner wall of the valve body 1, and a valve plate 3 located above the valve seat 12 is slidably provided in the valve body 1; when the transported medium enters from the medium inlet 111, it is impacted by the valve plate 3 covered on the valve seat 12, and finally discharged from the medium outlet 112; when the transportation stops, the valve plate 3 blocks the opening of the valve seat 12 by its own weight, and the check valve is in a closed state at this time.

[0034] 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 is integrally formed on the side of the valve plate 3 away from the valve seat 12 and is slidably inserted into the guide sleeve 21; a positioning convex 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 embedded and fixed on the side of the valve plate 3 facing the valve seat 12 by glue; A spring 22 is sleeved on the outer periphery of the guide sleeve 21, and the two ends of the spring 22 are respectively pressed against the side surfaces of the valve cover 2 and the valve plate 3 that are close to each other; when the medium stops being input from the medium inlet 111, under the weight of the valve plate 3 and the squeezing of the valve plate 3 by the spring 22, the elastic sealing ring 32 is pressed against the positioning protrusion, thereby ensuring the sealing performance of the valve when the valve is in a closed state.

[0035] The implementation principle of the embodiment of the present application is: When the medium flows in from the inlet, the fluid impact pushes the valve plate 3 to overcome the elastic force of the spring 22 and move upward, so that the elastic sealing ring 32 is separated from the graphene positioning convex ring 13, and the valve port is opened to realize the circulation of the medium; when the medium stops inputting, the valve plate 3 moves downward under the dual action of its own weight and the compression force of the spring 22, and the elastic sealing ring 32 fits tightly with the positioning convex ring 13, and cooperates with the linear guiding constraint of the guide sleeve 21 on the positioning rod 31 to form a double sealing structure, ensuring that the valve seat 12 is completely closed, effectively preventing the medium from flowing back, and realizing the high-reliability one-way shut-off function of the small valve.

[0036] Embodiment 2: Reference Figure 4 and Figure 5, the embodiment of the present application is different from the embodiment 1 in that a support assembly 4 is provided on the outside of the valve body 1, wherein the support assembly 4 comprises two connecting rods 41 relatively hinged to the upper side of the valve cover 2, wherein the end of the connecting rod 41 away from the valve cover 2 is vertically fixed with a support rod 42 facing the valve body 1, and the end of the support rod 42 away from the connecting rod 41 is fixed with a support plate 43, and a plurality of moving wheels 44 are installed on the side of the support plate 43 away from the support rod 42; A control member 5 is provided on the valve cover 2 for rotating the connecting rod 41 to fit with the upper side of the valve cover 2 and fix it; when the connecting rod 41 is rotated to fit 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, and 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 staff to drag the check valve for a short distance.

[0037] Refer to 4 and Figure 5 The fixing member includes a center rod 51 rotatably arranged in the middle of the upper side of the valve cover 2, the center rod 51 can rotate around its own axis, and a fixing plate 52 is fixedly arranged on the end surface of the center rod 51 away from the valve cover 2, wherein the fixing plate 52 is parallel to the upper side of the valve cover 2; When the connecting rod 41 rotates toward the valve body 1 to abut against the upper side of the valve cover 2, the fixing plate 52 can rotate with the center rod 51 to abut against the upper side of the connecting rod 41 in this state; and a fixing bolt 53 is provided above the valve cover 2 to fix the fixing plate 52 in this state to the connecting rod 41; A fixing through hole is provided on the fixing plate 52, and a fixing screw hole that can overlap with the fixing through hole is provided on the connecting rod 41. The fixing bolt 53 is a butterfly bolt 531 that can penetrate the fixing through hole and then be screwed into the fixing screw hole, thereby achieving limited fixation of the connecting rod 41 in this state.

[0038] Reference Figure 5 and Figure 6 The fixing plate 52 is provided with an elastic clamping member 54, wherein the elastic clamping member 54 includes a compression spring 541 and an arc-shaped protrusion 542. A placement groove 521 for the compression spring 541 and the arc-shaped protrusion 542 to be placed is provided on the side of the fixing plate 52 facing the valve cover 2. The compression spring 541 presses one side of the arc-shaped protrusion 542 so that a part of the arc-shaped protrusion 542 protrudes from the opening of the placement groove 521. The outer side surface of the corresponding protruding part is an arc surface, and the arc length corresponding to the arc surface is a minor arc. The connecting rod 41 is provided with a positioning groove 411 for the protruding part of the arc-shaped protrusion 542 to be snapped into; when the fixing through hole coincides with the fixing screw hole, the elastic clip 54 is just snapped into the positioning groove 411, and the snap-in feeling during snapping reminds the staff that the fixing through hole and the fixing screw hole are appropriately overlapped, thereby facilitating the installation of the fixing bolt 53.

[0039] Reference Figure 7 and Figure 8 The fixing plate 52 is provided with a locking member 6, which includes two locking rods 61 relatively hinged to the side of the fixing plate 52 away from the valve cover 2, wherein 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, and a locking notch 621 is formed on the locking block 62, and an elastic pad 63 of rubber material is glued on the inner wall of the locking notch 621 of the locking block 62; When it is necessary to rotate the support rod 42 along with the connecting rod 41 to a vertically upward state, the fixing plate 52 is rotated in advance in this state of the support rod 42 to a state perpendicular to the length direction of the connecting rod 41, and then the support rod 42 is flipped over; then the staff controls the locking rod 61 to rotate so that the support rod 42 is interference fit into the locking notch 621, and at this time the elastic pad 63 is pressed against the outer peripheral surface of the support rod 42 to fix the two support rods 42 in the vertically upward state.

[0040] When the check valve needs to be transported over a long distance, this state is convenient for packaging and transporting the check valve; when the road surface for a short distance is rough, in this state the two support plates 43 located above the valve cover 2 can act as "handles" to facilitate direct transportation of the check valve.

[0041] Reference Figure 5 , an indicating 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 for the indicating rod 33 to pass through is coaxially opened on the valve cover 2, and a second through hole 511 for the indicating rod 33 to pass through is coaxially opened on the center rod 51 and the fixing plate 52, and a first sealing ring 24 made of rubber is embedded on the inner wall of the first through hole 23; the end of the indicating rod 33 away from the positioning rod 31 passes through the first through hole 23 and the second through hole 511 and then extends to the top of the valve cover 2; When the check valve is installed on the pipeline, the staff can judge the opening and closing status of the check valve by observing the upward height of the indicator rod 33, which is more intuitive; in other embodiments, an additional sealing ring is also embedded on the inner wall of the first through hole 23 to enhance the corresponding sealing performance, which will not be repeated here.

[0042] Reference Figure 7 When the two support rods 42 are in a vertically upward state, the sides of the two support plates 43 close to each other are fixed with extension plates 431 located above the indicator rod 33, and in this state, the sides of the two extension plates 431 close to each other abut against each other; thereby, the upper part of the indicator rod 33 is protected by the extension plate 431, reducing the possibility of external dust adhering to the indicator rod 33 from above the valve cover 2.

[0043] The implementation principle of the embodiment of the present application is: In the check valve, by hingedly connecting the connecting rod 41 on the upper side of the valve cover 2, and arranging the support rod 42 and the support plate 43, as well as the moving wheel 44 at the end of the connecting rod 41 away from the valve cover 2, the functions of auxiliary support for the valve body 1 and facilitating short-distance movement before the valve is installed are realized. At the same time, the connecting rod 41 is rotated to a state of being in contact with the upper side of the valve cover 2 by using the control member 5 (including the center rod 51, the fixing plate 52, the fixing bolt 53, etc.) to fix it, ensuring that the supporting plate 43 is flush with the bottom edge of the valve body 1 and the moving wheel 44 is in contact with the ground. In addition, an elastic clamping member 54 and a locking member 6 are designed, which are respectively used to remind the fixing through hole to coincide with the fixing screw hole and to fix the vertically upward support rod 42. The setting of the indicator rod 33 makes it convenient for the staff to observe the opening and closing state of the check valve. When the two support rods 42 are vertically upward, the extension plate 431 protects the upper part of the indicator rod 33 to prevent dust from adhering.

[0044] Unless otherwise defined, the terms or scientific terms used in this application should be understood by people with ordinary skills in the field to which this application belongs. The "first", "second", "third" and similar words used in this application do not indicate any order, quantity or importance, but are only used to distinguish different components. "One" or "one" and other similar words do not indicate a quantitative limit, but indicate that there is at least one. "Including" or "comprising" and other similar words mean that the elements or objects appearing in front of "including" or "comprising" cover the elements or objects listed after "including" or "comprising" and their equivalents, and do not exclude other elements or objects. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0045] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A lift check valve, comprising a valve body (1) and a valve cover (2) mounted on an upper opening of the valve body (1), wherein a flow channel (11) is provided in the valve body (1) with both ends communicating with the outside, and a valve seat (12) is fixedly provided on the inner wall of the valve body (1) and is located below the valve cover (2), and a valve plate (3) is slidably provided and is located 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) is fixedly provided on the side of the valve plate (3) away from the valve seat (12) and is slidably inserted into the guide sleeve (21); A positioning convex 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) capable of pressing tightly against the positioning convex ring (13) is embedded on the side surface 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 two ends of the spring (22) are respectively pressed tightly against the side surfaces of the valve cover (2) and the valve plate (3) that are close to each other.

2. A lift check valve according to claim 1, characterized in that: Two connecting rods (41) are hingedly connected to each other on the upper side of the valve cover (2); a support rod (42) facing the valve body (1) is vertically fixed to the end of the connecting rod (41) away from the valve cover (2); and a support plate (43) is fixed to the end of the support rod (42) away from the connecting rod (41); The valve cover (2) is provided with a control member (5) for rotating the connecting rod (41) to a state of being in contact with the upper side of the valve cover (2), and the support plate (43) can be flush with the bottom edge of the valve body (1) away from the valve cover (2) when the connecting rod (41) is rotated to a state of being in contact with the upper side of the valve cover (2).

3. A lift check valve according to claim 2, characterized in that: A plurality of moving wheels (44) are arranged on the side of the support plate (43) away from the support rod (42).

4. A lift check valve according to claim 2, characterized in that: The fixing member comprises a center rod (51) rotatably arranged at the middle of the upper side surface of the valve cover (2), the center rod (51) being capable of rotating around its own axis, and a fixing plate (52) being fixedly arranged on the end surface of the center rod (51) away from the valve cover (2); When the connecting rod (41) rotates in a direction close to the valve body (1) to a state where it abuts against the upper side of the valve cover (2), the fixing plate (52) can rotate along with the center rod (51) to a state where it abuts against the upper side of the connecting rod (41) in this state, and a fixing bolt (53) is provided above the valve cover (2) for fixing the fixing plate (52) in this state to the connecting rod (41).

5. A lift check valve according to claim 4, characterized in that: The fixing plate (52) is provided with an elastic clamping piece (54), and the connecting rod (41) is provided with a positioning groove (411) for the elastic clamping piece (54) to be clamped into.

6. A lift check valve according to claim 4, characterized in that: The support rod (42) can rotate with the connecting rod (41) to a vertically upward state, and the fixing plate (52) rotates to a state perpendicular to the connecting rod (41) when the support rod (42) is in this state, and a locking piece (6) is provided on the fixing plate (52) for fixing the support rod (42) in this state.

7. A lift check valve according to claim 6, characterized in that: The locking member (6) comprises a locking rod (61) hingedly connected to the side of the fixing plate (52) away from the valve cover (2), and a locking block (62) is fixedly arranged on the outer periphery of the end of the locking rod (61) away from the fixing plate (52); The locking block (62) is provided with a locking notch (621), and when the locking block (62) rotates with the locking rod (61), the support rod (42) can be interference fit into the locking notch (621).

8. A lift check valve according to claim 7, characterized in that: The locking block (62) is fixedly provided with an elastic pad (63) on the inner wall of the locking notch (621).

9. A lift check valve according to claim 6, characterized in that: An indicating rod (33) is coaxially fixedly arranged on the side of the positioning rod (31) away from the valve plate (3); a first through hole (23) for the indicating rod (33) to pass through is formed on the valve cover (2); and a second through hole (511) for the indicating rod (33) to pass through is formed on the center rod (51) and the fixing plate (52); A first sealing ring (24) is embedded on the inner wall of the first through hole (23), and the end of the indicating rod (33) away from the positioning rod (31) passes through the first through hole (23) and the second through hole (511) and then extends to the top of the valve cover (2).

10. A lift check valve according to claim 9, characterized in that: The two support plates (43) are both provided with an extension plate (431) located above the indicator rod (33) on the sides close to each other when the two support rods (42) are in a vertically upward state. The sides close to each other of the two extension plates (431) in this state abut against each other.

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