Check valve with valve position indication function

Abstract

The utility model relates to the technical field of check valves, in particular to a check valve with a valve position indicating function, which comprises a casing, a synchronous shaft lever, a valve clack component and a valve position indicating mechanism arranged on the outer side of the casing. The valve clack assembly is located in the shell and fixedly connected with the synchronous shaft rod, the valve position indicating mechanism comprises a synchronous indicating part and a fixed indicating part, the synchronous indicating part is fixedly connected with the end, extending out of the shell, of the synchronous shaft rod, and the end, away from the synchronous shaft rod, of the synchronous indicating part forms a trigger end. The fixed indication part comprises a first position detection switch and a second position detection switch which are fixedly arranged on the outer side of the shell and can be triggered by the trigger end. The valve position indicating mechanism is arranged outside the shell and used for indicating the rotating angle of the synchronous shaft rod, so that an operator can know the opening degree of the valve clack on site or remotely in real time.

Description

Technical Field

[0001] The utility model belongs to the technical field of check valves, in particular to a check valve with a valve position indicating function. Background Art

[0002] The check valve of the present application is used to be connected to the heat recovery extraction pipeline of the steam turbine or the gas supply pipeline of the gas turbine. The power station staff needs to know the opening and closing status of the valve in real time to confirm whether the valve is in a normal state. In order to improve the closing speed of the valve, the shell sealing surface is generally designed to be an inclined surface with an angle of 30°, so as to reduce the closing time of the check valve with a valve position indication function and ensure its rapid closing. The rocker arm drives the closing member valve disc assembly to rotate to quickly open and close the valve. Although the above structure can meet the rapid closing requirement of the valve, due to the existence of the valve seat inclination angle, the initial opening force required for the valve is relatively large. At this time, it is more necessary to monitor the opening and closing of the valve. In the prior art, a travel switch is installed on the actuator outside the valve to monitor the lifting and lowering of the actuator output shaft. Although the travel switch can reflect the opening and closing position of the actuator, due to the asynchronous movement of the actuator output end and the valve disc, the travel switch on the actuator cannot truthfully feedback the opening and closing action of the valve disc assembly, nor can it display the real-time opening position of the valve disc assembly. It is difficult for users to judge the actual opening angle of the valve. Therefore, a check valve with a valve position indication function is designed to solve the above problems. Utility Model Content

[0003] The purpose of the utility model is to provide a check valve with a valve position indication function, which solves the above-mentioned problem that the opening and closing action of the valve flap assembly cannot be accurately fed back, the real-time opening position of the valve flap assembly cannot be displayed, and it is difficult for users to judge the actual opening angle of the valve.

[0004] In order to solve the above technical problems, the utility model provides a check valve with a valve position indication function, comprising a housing, a synchronous shaft, a valve flap assembly and a valve position indication mechanism arranged outside the housing, wherein the synchronous shaft is rotatably connected to the housing and one end thereof extends out of the housing, the valve flap assembly is located in the housing and fixedly connected to the synchronous shaft.

[0005] The valve position indicating mechanism includes a synchronous indicating part and a fixed indicating part. The synchronous indicating part is fixedly connected to the end of the synchronous shaft extending out of the shell, and its end away from the synchronous shaft constitutes a trigger end. The fixed indicating part includes a first position detection switch and a second position detection switch respectively fixedly arranged on the outside of the shell and capable of being triggered by the trigger end.

[0006] Further, the fixed indicating part includes an angle indicating unit, the synchronous indicating part includes a pointer, one end of the pointer is fixedly connected to the synchronous shaft, and the other end constitutes the trigger end, the angle indicating unit is fixedly connected to the shell, and the angle indicating unit includes a scale line arranged outside the shell and used to indicate the rotation angle of the trigger end.

[0007] Further, the first position detection switch is located in the triggering area of ​​the triggering end when the check valve is fully opened, and the second position detection switch is located in the triggering area of ​​the triggering end when the check valve is fully closed.

[0008] The first position detection switch and the second position detection switch are connected to a control unit.

[0009] Furthermore, the valve flap assembly includes a rocker arm and a valve flap, one end of the rocker arm is fixedly connected to the synchronization shaft, and the valve flap is installed on the other end of the rocker arm.

[0010] Furthermore, the check valve also includes a driving mechanism for driving the synchronous shaft to rotate, and the driving mechanism and the valve position indicating mechanism are respectively arranged on both sides of the shell relative to each other, and the synchronous shaft includes a first shaft, a second shaft, a clutch active part and a clutch driven part, the first shaft and the second shaft are respectively rotatably connected to the shell, one end of the first shaft passes through the shell and is fixedly connected to the output end of the driving mechanism, the clutch active part is fixedly arranged on the other end of the first shaft, the clutch driven part is fixedly connected to one end of the second shaft and / or the rocker arm, and the clutch driven part is clutch-matched with the clutch active part, and the other end of the second shaft extends out of the shell and is connected to the valve position indicating mechanism.

[0011] Furthermore, sealing structures are provided between the first shaft rod and the second shaft rod and the openings on both sides of the shell respectively.

[0012] Furthermore, the first shaft and the clutch active part are an integrally formed structure, and the clutch driven part and the rocker arm are an integrally formed structure.

[0013] Furthermore, the clutch driven part is sleeved on the second shaft rod, and a second key is provided between the clutch driven part and the second shaft rod.

[0014] Furthermore, the driving mechanism includes a lifting actuator, a rotating rod, an upper limit piece and a lower limit piece. The lifting actuator is fixedly mounted on the outside of the shell, one end of the rotating rod is sleeved on the first shaft rod, and the output shaft of the lifting actuator passes through the other end of the rotating rod and extends out. The upper limit piece and the lower limit piece are respectively located on the upper and lower sides of the rotating rod and are arranged on the output shaft of the lifting actuator to limit the rotating rod.

[0015] Furthermore, the synchronous shaft is a third shaft, the end of the third shaft extends out of the shell, the check valve also includes a driving mechanism for driving the third shaft, the driving mechanism includes a lifting actuator, a rotating rod and an upper limit member, the lifting actuator is fixedly mounted on the outside of the shell, one end of the rotating rod is sleeved on the end of the third shaft extending out of the shell, a balancing weight is sleeved on the third shaft, the output shaft of the lifting actuator passes through the other end of the rotating rod and extends out, the upper limit member is arranged on the output shaft of the lifting actuator and is located above the rotating rod, and is used to limit the rotating rod.

[0016] Beneficial effects of the utility model: a valve position indicating mechanism is arranged on the outside of the shell of the utility model, and the synchronous shaft rod rotates synchronously with the valve flap assembly, and the valve position indicating mechanism indicates the rotation angle of the synchronous shaft rod. The control unit can receive the rotation angle of the synchronous shaft rod fed back by the valve position indicating mechanism in real time through the first stroke switch and the second stroke switch, and the on-site operator can indicate the rotation angle of the valve flap through the synchronous indicating part which rotates synchronously with the valve flap assembly, so that the operator can understand the opening of the valve flap at any time on-site.

[0017] Through the cooperation of the first position detection switch and the second position detection switch with the pointer, the valve disc opening can be read on site and the valve position of the check valve can be remotely monitored;

[0018] The synchronous shaft adopts a double shaft design. The second shaft rotates synchronously with the valve disc assembly and drives the pointer of the valve position indicator mechanism to rotate, so as to effectively monitor the rotation angle of the second shaft and the opening of the valve disc assembly.

[0019] With the single-axis design, the third axis and the valve disc assembly rotate synchronously, which will drive the pointer of the valve position indicating mechanism to rotate, thereby effectively monitoring the rotation angle of the third axis and the opening of the valve disc assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 It is a cross-sectional view of a check valve with valve position indication function of the utility model;

[0022] Figure 2 It is a partial cross-sectional view of a first shaft rod and a second shaft rod of a check valve with a valve position indicating function of the utility model;

[0023] Figure 3 It is an enlarged view of the A direction of a check valve with valve position indication function of the utility model;

[0024] Figure 4 It is a right view of the driving mechanism of a check valve with valve position indication function with two states of a lower limiter of the utility model;

[0025] Figure 5 It is a right view of two states of a driving mechanism of a check valve with a valve position indicating function without a lower limit piece of the utility model;

[0026] Figure 6 It is a partial cross-sectional view of a rocker arm of a check valve with a valve position indicating function according to the utility model;

[0027] Figure 7 It is a partial cross-sectional view of a first shaft rod of a check valve with a valve position indicating function of the utility model;

[0028] Figure 8 It is a partial cross-sectional view of the third shaft rod of a check valve with valve position indication function of the utility model;

[0029] In the figure: 1-housing, 2-sealing structure, 4-valve disc, 5-driving mechanism, 6-valve position indicating mechanism, 7-synchronizing shaft, 9-rocker arm, 10-balancing weight, 18-second key, 17-first key, 51-output shaft, 52-rotating rod, 53-upper limit member, 54-lower limit member, 62-angle indicating unit, 63-first position detection switch, 64-second position detection switch, 65-pointer, 71-first shaft, 72-second shaft, 73-clutch active part, 74-clutch driven part, 711-third shaft. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings of the utility model specification to clearly and completely describe the technical solutions in the utility model embodiments. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] The following will be described in detail with reference to two specific embodiments of the present invention and the accompanying drawings.

[0032] A check valve with a valve position indication function comprises a housing 1, a synchronous shaft 7, a valve disc assembly and a valve position indication mechanism 6 arranged outside the housing 1, wherein the housing 1 comprises a valve body and a valve cover fixed to the upper end of the valve body, the synchronous shaft 7 is rotatably connected to the valve body, and one end of the synchronous shaft 7 extends out of the valve body, the valve disc assembly is located in the valve body and is fixedly connected to the synchronous shaft 7,

[0033] The valve position indicating mechanism 6 includes a synchronous indicating portion and a fixed indicating portion. The synchronous indicating portion is fixedly connected to the end of the synchronous shaft rod 7 extending out of the valve body, and the end thereof away from the synchronous shaft rod 7 constitutes a triggering end.

[0034] The fixed indicating part includes a first position detection switch 63 and a second position detection switch 64, which are respectively fixedly arranged on the outside of the valve body and can be triggered by the trigger end. The fixed indicating part also includes an angle indicating unit 62. The synchronous indicating part includes a pointer 65, one end of which is fixedly connected to the synchronous shaft 7, and the other end constitutes the trigger end. The angle indicating unit 62 is fixedly connected to the valve body. The angle indicating unit 62 is composed of a plurality of scale lines arranged outside the valve body and used to indicate the rotation angle of the trigger end. The plurality of scale lines include an end scale line for indicating that the valve flap 4 is fully open, a start scale line for indicating that the valve flap 4 is closed, and an opening scale line located between the end scale line and the start scale line and used to indicate the opening of the valve flap 4.

[0035] The sensing end of the first position detection switch 63 is located in the triggering area of ​​the triggering end when the check valve is fully opened, and the sensing end of the second position detection switch 64 is located in the triggering area of ​​the triggering end when the check valve is fully closed. The first position detection switch 63 and the second position detection switch 64 are connected to a control unit, and the control unit is arranged in the remote monitoring room of the power station.

[0036] In this embodiment, the first position detection switch 63 and the second position detection switch 64 are respectively the first travel switch and the second travel switch. The sensing end of the first position detection switch 63 is located at a position where it can be touched by the trigger end when the check valve is fully opened, that is, the sensing end of the first position detection switch 63 is located on the end scale line, and the sensing end of the second position detection switch 64 is located at a position where it can be touched by the trigger end when the check valve is fully closed, that is, the sensing end of the second position detection switch 64 is located on the start scale line.

[0037] In other embodiments, the first position detection switch 63 and the second position detection switch 64 may also be proximity switches or the like.

[0038] The fixed indicating part also includes an indicating plate, which is fixedly mounted on the valve body or the valve cover, on which the first position detection switch 63 and the second position detection switch 64 are fixedly mounted, and the angle indicating unit 62 is formed on the indicating plate. In this embodiment, a cantilever is fixedly mounted on the outside of the valve body, and the cantilever extends from one side of the valve body, and the cantilever has a shaft extension hole. The indicating plate is fixedly mounted on the cantilever.

[0039] The synchronous indicating part includes a pointer 65. After the second shaft rod 72 extends out of the valve body, it passes through the shaft extension hole and is fixedly connected to one end of the pointer 65. The other end of the pointer constitutes a trigger end. Specifically, a first key 17 is provided between the pointer 65 and the second shaft rod 72, so that the second shaft rod 72 and the pointer 65 can rotate synchronously.

[0040] The valve flap assembly includes a rocker arm 9 and a valve flap 4 . One end of the rocker arm 9 is fixedly connected to the synchronous shaft 7 , and the valve flap 4 is fixedly mounted on the other end of the rocker arm 9 .

[0041] The check valve also includes a driving mechanism 5 for driving the synchronous shaft rod 7 to rotate. The driving mechanism 5 and the valve position indicating mechanism 6 are respectively arranged on both sides of the valve body. The synchronous shaft rod 7 includes a first shaft rod 71, a second shaft rod 72, a clutch active part 73 and a clutch driven part 74. The first shaft rod 71 and the second shaft rod 72 are respectively rotatably connected to the valve body. A sealing structure 2 is respectively provided between the first shaft rod 71 and the second shaft rod 72 and the openings on both sides of the valve body. One end of the first shaft rod 71 passes through the valve body and is fixedly connected to the output end of the driving mechanism 5. The clutch active part 73 is fixedly arranged at the other end of the first shaft rod 71. The clutch driven part 74 is fixedly connected to one end of the second shaft rod 72 and / or the rocker arm 9, and the clutch driven part 74 is clutch-matched with the clutch active part 73. The other end of the second shaft rod 72 extends out of the valve body and is connected to the valve position indicating mechanism 6.

[0042] The clutch driven part 74 is sleeved on the second shaft 72 , and a second key 18 is provided between the clutch driven part 74 and the second shaft 72 , so that the second shaft 72 and the clutch driven part 74 can rotate synchronously.

[0043] In this embodiment, the first shaft 71 and the clutch active part 73 are an integrally formed structure. Of course, in other embodiments, the clutch active part 73 in this embodiment may be key-connected to the first shaft 71 , or the clutch active part 73 may be welded to the first shaft 71 .

[0044] In this embodiment, the clutch driven part 74 and the rocker arm 9 are an integrally formed structure. It is understandable that the clutch driven part 74 and the rocker arm 9 can be directly fixedly connected or indirectly fixedly connected, such as by fixing the clutch driven part 74 and the second shaft 72 through the second key 18 or welding to achieve fixed connection between the clutch driven part 74 and the rocker arm 9.

[0045] The driving mechanism 5 includes a lifting actuator, a rotating rod 52, an upper limit member 53 and a lower limit member 54. The lifting actuator is fixedly installed on the outer side of the valve body. In the present embodiment, the lifting actuator is a cylinder driving device. One end of the rotating rod 52 is fixedly sleeved on the first shaft rod 71. The output shaft 51 of the lifting actuator passes through the other end of the rotating rod 52 and extends out. The upper limit member 53 and the lower limit member 54 are respectively located on the upper and lower sides of the rotating rod 52 and are arranged on the output shaft 51 of the lifting actuator for limiting the rotating rod 52, so that the end of the rotating rod 52 connected to the output shaft 51 can be lifted and lowered with the output shaft 51.

[0046] The synchronous shaft 7 adopts a double-shaft design. The output shaft 51 of the driving mechanism 5 rises to drive the first shaft 71 to rotate. Since the clutch active part 73 and the clutch driven part 74 are clutch-coordinated, and there is a rotation margin between the clutch active part 73 and the clutch driven part 74 after the first shaft 71 rotates, the valve disc 4 realizes the opening or closing of the check valve under the action of the medium impact force or gravity.

[0047] The second shaft 72 rotates synchronously with the valve flap 4 , driving the pointer 65 of the valve position indicating mechanism 6 to rotate, and the opening and closing conditions of the valve flap 4 are monitored by detecting the rotation angle of the second shaft 72 .

[0048] Embodiment 2

[0049] The overall structure is basically the same as that of the first embodiment, except that the second embodiment defines the synchronous shaft as a single-axis structure, and only an upper limit member 19 is provided on the output shaft 51 of the lifting actuator, the synchronous shaft 7 is a third shaft 711, and the end of the third shaft 711 extends out of the valve body. The check valve with a valve position indication function also includes a driving mechanism 5 for driving the third shaft 711. The driving mechanism 5 includes a lifting actuator, a rotating rod 52 and an upper limit member 53. The lifting actuator is fixedly mounted on the outside of the valve body. In this embodiment, the lifting actuator is a cylinder driving device, one end of the rotating rod 52 is fixedly sleeved on the end of the third shaft 711 extending out of the valve body, and a balancing weight 10 is fixedly sleeved on the third shaft 711. The output shaft 51 of the lifting actuator passes through the other end of the rotating rod 52 and extends out. The upper limit member 53 is arranged on the output shaft 51 of the lifting actuator and is located above the rotating rod 52, and is used to limit the rotating rod 52.

[0050] The workflow of this utility model:

[0051] The operation process of the double-shaft rod: the output shaft 51 of the lifting actuator of the driving mechanism 5 moves upward, and the lower limit member 54 drives the rotating rod 52 to move upward along the rotation direction of the first shaft rod 71. At this time, there is a certain rotation margin between the clutch driven part 74 and the clutch active part 73. When the medium passes through, the impact of the medium pushes the valve disc 4 to open, so as to drive the rocker arm 9, the clutch driven part 74 and the second shaft rod 72 to rotate, so as to facilitate the medium to pass through; when no medium passes through, the valve disc assembly is closed under the action of gravity, so that the valve disc 4 fits with the gate of the housing 1, thereby achieving The check valve is opened and closed freely. When the valve is opened and closed freely, the pointer 65 of the valve position indicating mechanism 6 rotates with the rotation of the second shaft rod 72. The indicating end of the pointer 65 indicates the rotation angle of the second shaft rod 72. When the pointer reaches the end scale line of the scale line, it contacts the sensing end of the first position detection switch 63 or the second position detection switch 64. The first position detection switch 63 or the second position detection switch 64 feeds back the data to the control unit through a signal. The control unit can monitor the rotation of the second shaft rod 72 and the opening and closing of the valve disc 4 in real time.

[0052] Auxiliary valve closing process: the lifting actuator output shaft 51 of the driving mechanism 5 moves downward, and the upper limit member 53 drives the rotating rod 52 downward along the rotation direction of the first shaft 71, and drives the valve disc 4 to close with the gate of the housing 1 under the drive of the rocker arm 9 through the clutch active part 73 and the clutch driven part 74, thereby closing the valve, and the second shaft 72 rotates synchronously. During the valve closing process, the pointer 65 of the valve position indicating mechanism 6 rotates along with the rotation of the second shaft 72. The indicating end of the pointer 65 indicates the rotation angle of the second shaft 72. When the pointer 65 indicates the starting scale line of the scale line, it contacts the sensing end of the second position detection switch 64. The second position detection switch 64 feeds back the data to the control unit through the signal. The control unit can monitor the rotation of the second shaft 72 and the closing of the valve disc 4 in real time.

[0053] Working process of single axis rod:

[0054] The output shaft 51 of the lifting actuator extends upward, and the upper limit member 53 extends upward synchronously. The other end of the rotating rod 52 ( Figure 5The right end as shown in the figure) can freely move up and down with the rotation direction of the third shaft 711. When the medium flows, the valve flap 4 is opened under the impact of the medium to drive the valve flap assembly to rotate and realize the opening of the check valve. At the same time, the pointer 65 fixed on the third shaft 711 rotates with the third shaft 711, and the indicating end of the pointer 65 indicates the rotation angle of the third shaft 711. When the pointer 65 of the valve position indicating mechanism 6 reaches the end scale line, it contacts the sensing end of the first position detection switch 63. The first position detection switch 63 feeds back the data to the control unit through a signal. The control unit can monitor the rotation of the third shaft 711 and the opening of the valve flap 4 in real time.

[0055] When there is no medium flowing, the valve disc 4 fits with the gate of the housing 1 under the action of gravity to close the check valve. At the same time, the pointer 65 sleeved on the third shaft 711 rotates along with the third shaft 711, and the indicating end of the pointer 65 indicates the rotation angle of the third shaft 711. When the pointer 65 of the valve position indicating mechanism 6 reaches the starting scale line, it contacts the sensing end of the second position detection switch 64. The second position detection switch 64 feeds back the data to the control unit through a signal, and the control unit can monitor the rotation of the third shaft 711 and the closing of the valve disc 4 in real time.

[0056] Auxiliary closing process: the output shaft 51 of the lifting actuator moves downward, and the upper limit member 53 drives the rotating rod 52 downward along the rotation direction of the third shaft rod 711, and synchronously drives the third shaft rod 711 to rotate. The valve flap 4 is closed with the gate of the shell 1 under the drive of the rocker arm 9, thereby closing the valve. During the valve closing process, the pointer 65 of the valve position indicating mechanism 6 rotates along with the rotation of the third shaft rod 711. The indicating end of the pointer 65 indicates the rotation angle of the third shaft rod 711. When the pointer 65 indicates the starting scale line of the scale line, it contacts the sensing end of the second position detection switch 64. The second position detection switch 64 feeds back the data to the control unit through a signal. The control unit can monitor the rotation of the third shaft rod 711 and the closing status of the valve flap 4 in real time.

[0057] The above disclosure is only a preferred embodiment of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the claims of the present invention are still within the scope covered by the present invention.

Claims

1. A check valve with valve position indication function, characterized in that: The invention comprises a housing (1), a synchronous shaft (7), a valve flap assembly, and a valve position indicating mechanism (6) arranged outside the housing (1); the synchronous shaft (7) is rotatably connected to the housing (1), and one end of the synchronous shaft (7) extends out of the housing (1); the valve flap assembly is located inside the housing (1) and is fixedly connected to the synchronous shaft (7); The valve position indicating mechanism (6) comprises a synchronous indicating portion and a fixed indicating portion, wherein the synchronous indicating portion is fixedly connected to the end of the synchronous shaft (7) extending out of the housing (1), and the end thereof away from the synchronous shaft (7) constitutes a triggering end, and the fixed indicating portion comprises a first position detection switch (63) and a second position detection switch (64) which are respectively fixedly arranged on the outside of the housing (1) and can be triggered by the triggering end.

2. A check valve with valve position indication function according to claim 1, characterized in that: The fixed indicating portion comprises an angle indicating unit (62), the synchronous indicating portion comprises a pointer (65), one end of the pointer (65) is fixedly connected to the synchronous shaft (7), and the other end constitutes the trigger end, the angle indicating unit (62) is fixedly connected to the housing (1), and the angle indicating unit (62) comprises a scale line arranged outside the housing (1) and used to indicate the rotation angle of the trigger end.

3. The check valve with valve position indication function according to claim 1, characterized in that: The first position detection switch (63) is located in the triggering area of ​​the triggering end when the check valve is fully opened, and the second position detection switch (64) is located in the triggering area of ​​the triggering end when the check valve is fully closed. The first position detection switch (63) and the second position detection switch (64) are connected to a control unit.

4. The check valve with valve position indication function according to claim 1, characterized in that: The valve flap assembly comprises a rocker arm (9) and a valve flap (4), one end of the rocker arm (9) is fixedly connected to the synchronous shaft (7), and the valve flap (4) is mounted on the other end of the rocker arm (9).

5. The check valve with valve position indication function according to claim 4, characterized in that: The check valve further comprises a driving mechanism (5) for driving the synchronous shaft (7) to rotate. The driving mechanism (5) and the valve position indicating mechanism (6) are respectively arranged on two sides of the housing (1) opposite to each other. The synchronous shaft (7) comprises a first shaft (71), a second shaft (72), a clutch active part (73) and a clutch passive part (74). The first shaft (71) and the second shaft (72) are respectively rotatably connected to the housing (1). The clutch active part (73) is fixedly arranged on the other end of the first shaft (71), the clutch driven part (74) is fixedly connected to the second shaft (72) and / or one end of the rocker arm (9), and the clutch driven part (74) is clutch-matched with the clutch active part (73), and the other end of the second shaft (72) extends out of the housing (1) and is connected to the valve position indicating mechanism (6).

6. A check valve with valve position indication function according to claim 5, characterized in that: A sealing structure (2) is provided between the first shaft rod (71) and the second shaft rod (72) and the openings on both sides of the shell (1).

7. The check valve with valve position indication function according to claim 5, characterized in that: The first shaft (71) and the clutch active part (73) are an integrally formed structure, and the clutch driven part (74) and the rocker arm (9) are an integrally formed structure.

8. The check valve with valve position indication function according to claim 5, characterized in that: The clutch driven part (74) is sleeved on the second shaft (72), and a second key (18) is provided between the clutch driven part (74) and the second shaft (72).

9. The check valve with valve position indication function according to claim 5, characterized in that: The driving mechanism (5) comprises a lifting actuator, a rotating rod (52), an upper limit member (53) and a lower limit member (54); the lifting actuator is fixedly mounted on the outer side of the housing (1); one end of the rotating rod (52) is sleeved on the first shaft rod (71); the output shaft (51) of the lifting actuator passes through the other end of the rotating rod (52) and extends out; the upper limit member (53) and the lower limit member (54) are respectively located on the upper and lower sides of the rotating rod (52) and are arranged on the output shaft (51) of the lifting actuator for limiting the rotating rod (52).

10. The check valve with valve position indication function according to claim 1, characterized in that: The synchronous shaft (7) is a third shaft (711), the end of which protrudes from the housing (1). The check valve also includes a driving mechanism (5) for driving the third shaft (711). The driving mechanism (5) includes a lifting actuator, a rotating rod (52) and an upper limit member (53). The lifting actuator is fixedly mounted on the outer side of the housing (1). One end of the rotating rod (52) is sleeved on the end of the third shaft (711) protruding from the housing (1). A balancing weight (10) is sleeved on the third shaft (711). The output shaft (51) of the lifting actuator passes through the other end of the rotating rod (52) and protrudes. The upper limit member (53) is arranged on the output shaft (51) of the lifting actuator and is located above the rotating rod (52), and is used to limit the rotating rod (52).

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