A regulating valve with double flap butterfly check function

Abstract

The application discloses a regulating valve with double-disc butterfly check function, which comprises a valve body, two valve rods and two regulating assemblies. The valve body is internally provided with a flow passage, and the flow passage is provided with a stepped surface. The two valve rods are arranged along the same rotation axis, and one end of each valve rod extends into the flow passage. The two regulating assemblies are respectively connected to the two valve rods in the flow passage. Each regulating assembly comprises a butterfly plate, a mounting sleeve and an elastic pre-tightening piece. The butterfly plate is fixedly connected to the mounting sleeve, and the mounting sleeve is rotationally connected to the corresponding valve rod. In the closed state, the two butterfly plates in the two regulating assemblies are combined to form a closed plate, and the closed plate is connected to the stepped surface to disconnect the flow passage. The elastic pre-tightening piece is used for providing elastic pre-tightening force for driving the butterfly plate to rotate in the closing direction. The mounting sleeve and the valve rod are provided with a linkage structure, so that when the valve rod rotates in the closing direction, the mounting sleeve is driven to rotate in the same direction, and when the valve rod rotates in the opening direction, the mounting sleeve is not driven to rotate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of regulating valve, and particularly relates to a regulating valve with double-valve butterfly check function. BACKGROUND

[0002] The current straight-through regulating valve is S-shaped flow channel, and the flow path is complex, the flow resistance is high, the flow capacity is low, the flow resistance of the butterfly regulating valve is low, the flow capacity is high, but the flow is large at small opening, the regulating precision is low, and neither of the two regulating valves has the check function, and if the medium flows reversely under abnormal conditions, great damage will be caused to the whole system. SUMMARY

[0003] In view of the above problems, the present application provides a regulating valve with double-valve butterfly check function.

[0004] The technical scheme of the present application is as follows:

[0005] A regulating valve with double-valve butterfly check function, comprising:

[0006] A valve body, a flow passage is arranged in the valve body, the regulating valve allows the medium to flow from the first end to the second end of the flow passage, a stepped surface is arranged on the inner side wall of the flow passage and faces the second end of the flow passage;

[0007] Two valve rods, one end of the valve rod is located outside the valve body, the other end of the valve rod penetrates the valve body and extends into the flow passage from the inner side wall of the flow passage, and the two valve rods are arranged along the same rotation axis;

[0008] Two regulating assemblies are arranged in the flow passage and are connected to the two valve rods respectively, and each of the two regulating assemblies has a first direction;

[0009] The regulating assembly comprises a butterfly plate, a mounting sleeve and an elastic pre-tightening piece, the butterfly plate is fixedly connected to the mounting sleeve, the mounting sleeve is sleeved on the corresponding valve rod and is rotationally connected with the valve rod, in the closed state of the regulating valve, the two butterfly plates in the two regulating assemblies are combined to form a closed plate, the closed plate abuts the stepped surface around the surface facing the first end of the flow passage to disconnect the flow passage, and the direction in which the butterfly plate rotates from the closed state to the second end direction of the flow passage is the first direction of the regulating assembly;

[0010] The elastic pre-tightening member is configured to provide an elastic pre-tightening force for driving the butterfly plate to rotate in a direction opposite to the first direction; and the mounting sleeve and the valve stem are provided with a linkage structure configured to drive the mounting sleeve to rotate in the same direction as the valve stem when the valve stem rotates in a direction opposite to the first direction, and not to rotate the mounting sleeve when the valve stem rotates in the first direction.

[0011] Optionally, the linkage structure comprises a first limiting member and a second limiting member, the first limiting member is connected to the valve stem, and the second limiting member is connected to the mounting sleeve, the first limiting member is arranged in the first direction of the second limiting member so as to drive the mounting sleeve to rotate in the same direction as the valve stem when the valve stem rotates in a direction opposite to the first direction until the first limiting member abuts against the second limiting member.

[0012] Optionally, the mounting sleeve is provided with a through hole, the through hole is sleeved on the valve stem, the through hole has a first section and a second section arranged along the rotation axis, the first section is rotationally connected with the valve stem, and the second section has a diameter larger than that of the first section.

[0013] The region of the valve stem corresponding to the second section of the mounting sleeve is an adjusting section of the valve stem, the adjusting section of the valve stem and the second section have a first gap, and the first limiting member and the second limiting member are arranged in the first gap.

[0014] Optionally, a valve stem sleeve is sleeved and fixedly connected on the adjusting section of the valve stem, and a second gap is formed between the outer side wall of the valve stem sleeve and the inner side wall of the second section.

[0015] The first limiting member is protruded on the outer side wall of the valve stem sleeve, the second limiting member protrudes from the inner side wall of the second section to the second gap, and the second limiting member can rotate around the rotation axis in a region of the second gap other than the first limiting member.

[0016] Optionally, the second limiting member is a limiting bolt, the mounting sleeve is provided with a threaded hole, the limiting bolt extends into the second gap after passing through the threaded hole, and the limiting bolt is threadedly and tightly connected with the threaded hole.

[0017] Optionally, the closure plate is divided into two halves along a division line parallel to the rotation axis, and the two halves are the butterfly plates of the two adjusting assemblies respectively.

[0018] Optionally, the elastic pre-tightening member is a torsion spring, the torsion spring is sleeved on the corresponding valve stem, and the two ends of the torsion spring abut against the butterfly plates of the corresponding adjusting assembly and the other adjusting assembly respectively.

[0019] Optionally, one end of the valve stem in the flow passage is the connecting end of the valve stem; one end face of the connecting end of one of the two valve stems is provided with a positioning connecting column, and one end face of the connecting end of the other valve stem is provided with a positioning connecting groove; and the positioning connecting column is inserted into the positioning connecting groove to connect the two valve stems.

[0020] The positioning connecting column can rotate around the rotation axis in the positioning connecting groove.

[0021] Optionally, the cross section of the flow passage is circular, and the rotation axis passes through the center of the circle.

[0022] Optionally, the regulating valve further comprises two valve stem actuators, which are located outside the valve body; the two valve stem actuators are connected to the two valve stems respectively, and are used to control the rotation angle of the corresponding valve stem to control the opening degree of the regulating valve.

[0023] Compared with the prior art, the regulating valve with double flap butterfly check function has the following advantages and positive effects:

[0024] The regulating valve with double flap butterfly check function provided by the application controls the opening degree of the regulating valve by rotating the valve stem in the first direction; when the valve stem is rotated to the angle corresponding to the required opening degree, the medium pressure drives the flap to rotate in the first direction against the elastic pre-tightening force of the elastic pre-tightening member, thereby realizing the flow of the medium.

[0025] The two flaps (one flap in each of the two regulating assemblies) are connected to the two valve stems respectively and are independently controlled, so that only one flap can be opened, or both flaps can be opened simultaneously or one flap is opened first and then the other flap is opened; therefore, the regulating valve has the advantages of high regulating precision and large flow capacity.

[0026] The regulating valve with double flap butterfly check function provided by the application has only two valve stems, two flaps and two elastic pre-tightening members in the flow passage, so that the flow resistance coefficient is low and the flow capacity is high; when the medium flows in the normal direction (i.e. from the first end to the second end of the flow passage), the flaps are opened, and the influence on the flow capacity of the regulating valve is small.

[0027] When the medium flows in the reverse direction, the elastic pre-tightening force of the elastic pre-tightening member drives the flaps to rotate in the direction opposite to the first direction to close the flaps; at the same time, the pressure of the reverse flow medium also drives the flaps to rotate in the direction opposite to the first direction. Therefore, the regulating valve can be closed in time and cut off the reverse flow of the medium to prevent accidents.

[0028] The application provides a regulating valve with double butterfly check function, both butterfly plates have respective elastic pre-tightening members, the elastic pre-tightening members can provide independent closing force (the closing force is also the elastic pre-tightening force). When the regulating valve needs to be closed, in the process of rotating the valve rod, when rotating to the corresponding angle of small opening degree, the medium flow rate slows down, the medium pressure starts to be less than the elastic pre-tightening force, and the elastic pre-tightening member automatically drives the butterfly plate to rotate to the step surface faster than the valve rod (that is, to rotate in the direction opposite to the first direction), thereby reducing the closing time of the regulating valve. When the medium flows reversely, not only the reversely flowing medium drives the butterfly plate to rotate to the step surface, but also the elastic pre-tightening member drives the butterfly plate to rotate to the step surface, so that the dynamic response speed (here, the dynamic response refers to the automatic check function of the regulating valve when the medium flows reversely) of the regulating valve is greatly increased, the influence of the water hammer phenomenon is reduced, and the non-impact performance is realized. BRIEF DESCRIPTION OF DRAWINGS

[0029] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The detailed description is merely meant to teach a person skilled in the art how to implement and practice the present application. It is not meant to put limitations on the scope of the present application.

[0030] Figure 1 FIG. 1 is a sectional view of a regulating valve with double butterfly check function according to the present application;

[0031] Figures 2 to 4 FIG. 2 is a schematic view of the regulating valve with double butterfly check function according to the present application at three opening degrees corresponding to the first valve rod when the medium is allowed to flow;

[0032] Figure 5 FIG. 3 is a sectional view of the regulating valve with double butterfly check function according to the present application at the first valve rod;

[0033] Figures 6 to 8 FIG. 4 is a schematic view of the regulating valve with double butterfly check function according to the present application at three opening degrees corresponding to the second valve rod when the medium is allowed to flow;

[0034] Figure 9 FIG. 5 is a sectional view of the regulating valve with double butterfly check function according to the present application at the second valve rod;

[0035] Figure 10 FIG. 6 is a schematic view of the structure of the regulating valve with double butterfly check function according to the present application in the flow passage;

[0036] Figure 11 FIG. 7 is a schematic view of the structure of the regulating valve with double butterfly check function according to the present application in the flow passage when the regulating valve is closed.

[0037] BRIEF DESCRIPTION OF DRAWINGS

[0038] 1: valve stem actuator; 2: valve stem; 3: mounting sleeve; 4: butterfly plate; 5: torsion spring; 6: valve body; 7: flow passage; 8: valve stem sleeve; 9: first limiting member; 10: second limiting member; 11: fixing pin;

[0039] A: medium is allowed to flow; B: first direction. DETAILED DESCRIPTION

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, specific embodiments of the present application will be described below with reference to the drawings. Obviously, the drawings in the following description only represent some embodiments of the present application, and for those skilled in the art, other drawings can be obtained from these drawings without creative labor, and other embodiments can also be obtained.

[0041] In order to make the drawing simple, only the parts related to the present application are shown in each drawing, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some drawings, only one of the components with the same structure or function is shown, or only one of them is marked. In this paper, "one" not only means "only one", but also means "more than one".

[0042] Referring to Figures 1 to 11 The embodiment provides a regulating valve with double-valve butterfly check function, which comprises a valve body 6, two valve stems 2 and two regulating assemblies. The valve body 6 is provided with a flow passage 7, and the regulating valve allows the medium to flow from the first end to the second end of the flow passage 7; the inner side wall of the flow passage 7 is provided with a stepped surface facing the second end of the flow passage 7. One end of the valve stem 2 is located outside the valve body 6, and the other end of the valve stem 2 extends into the flow passage 7 from the inner side wall of the flow passage 7 through the valve body 6; and the two valve stems 2 are arranged along the same rotation axis. The two regulating assemblies are located in the flow passage 7 and are connected to the two valve stems 2 respectively; the two regulating assemblies each have a first direction B.

[0043] The adjusting assembly comprises the butterfly plate 4, the mounting sleeve 3 and the elastic pre-tightening member, the butterfly plate 4 is fixedly connected to the mounting sleeve 3, and the mounting sleeve 3 is sleeved on the corresponding valve rod 2 and is rotationally connected with the valve rod 2. In the closed state of the regulating valve, the two butterfly plates 4 in the two adjusting assemblies are combined to form a closing plate, the closing plate abuts against the step surface around the surface of the first end of the flow passage 7 to disconnect the flow passage 7; the direction in which the butterfly plate 4 rotates from the closed state to the second end direction of the flow passage 7 is the first direction B of the adjusting assembly (the first directions B of the two adjusting assemblies are opposite based on the angle of the regulating valve, that is, based on the angle of the regulating valve, the first direction B of one adjusting assembly is clockwise, and the first direction B of the other adjusting assembly is counterclockwise); the direction in which the butterfly plate 4 rotates to the step surface is the direction opposite to the first direction B. When the opening of the regulating valve increases, the butterfly plate 4 rotates in the first direction B; when the opening of the regulating valve decreases, the butterfly plate 4 rotates in the direction opposite to the first direction B, that is, rotates in the direction of the step surface.

[0044] The elastic pre-tightening member is used to provide the elastic pre-tightening force for driving the butterfly plate 4 to rotate in the direction opposite to the first direction B. The mounting sleeve 3 and the valve rod 2 are provided with a linkage structure, and the linkage structure is configured to rotate the mounting sleeve 3 in the same direction as the valve rod 2 when the valve rod 2 rotates in the direction opposite to the first direction B, and not to rotate the mounting sleeve 3 when the valve rod 2 rotates in the first direction B.

[0045] The double-valve butterfly regulating valve with the check function of the present embodiment will be further described below.

[0046] One end of the valve rod 2 located in the flow passage 7 is the connecting end of the valve rod 2. Among the two valve rods 2, a positioning connecting column is arranged on the end face of the connecting end of one valve rod 2, and a positioning connecting groove is arranged on the end face of the connecting end of the other valve rod 2, and the positioning connecting column is inserted into the positioning connecting groove to realize the connection of the two valve rods 2; and the positioning connecting column can rotate around the rotation axis in the positioning connecting groove. In this way, the two valve rods 2 are arranged along the rotation axis, and the connecting ends of the two valve rods 2 abut to form an integral rod-shaped member, and the rotation of the two valve rods 2 can be controlled separately.

[0047] The butterfly plate 4 and the mounting sleeve 3 can be integrally made; of course, the butterfly plate 4 and the mounting sleeve 3 can also be fixedly connected through fasteners, key connections, clamping connections and the like.

[0048] The linkage structure comprises a first limiting member 9 and a second limiting member 10, the first limiting member 9 is connected to the valve rod 2, the second limiting member 10 is connected to the mounting sleeve 3, and the first limiting member 9 is arranged in the first direction B of the second limiting member 10 so as to drive the mounting sleeve 3 to rotate in the same direction when the valve rod 2 rotates in the direction opposite to the first direction B to abut against the second limiting member 10 after the first limiting member 9.

[0049] Specifically, the mounting sleeve 3 is provided with a through hole, the through hole is sleeved on the corresponding valve stem 2; the through hole has a first section and a second section arranged along the direction of the rotation axis, the first section is rotationally connected with the valve stem 2, and the diameter of the second section is greater than that of the first section. The region of the valve stem 2 corresponding to the second section of the mounting sleeve 3 is an adjusting section of the valve stem 2, and the adjusting section of the valve stem 2 has a first gap with the second section, and the first limiting piece 9 and the second limiting piece 10 are arranged in the first gap. In this way, when the valve stem 2 rotates in the direction opposite to the first direction B (that is, the valve opening is adjusted to be smaller), the valve stem 2 drives the first limiting piece 9 to rotate, the first limiting piece 9 abuts against the second limiting piece 10 and drives the second limiting piece 10 to rotate, and the second limiting piece 10 drives the mounting sleeve 3 and the butterfly plate 4 fixed to the mounting sleeve 3 to rotate; when the valve stem 2 rotates in the first direction B (that is, the valve opening is adjusted to be larger), the butterfly plate 4 rotates in the first direction B under the action of the medium pressure until the second limiting piece 10 abuts against the first limiting piece 9. The rotation region of the first limiting piece 9 and the second limiting piece 10 is the first gap.

[0050] More specifically, the adjusting section of the valve stem 2 is sleeved and fixedly connected with the valve stem sleeve 8, the outer side wall of the valve stem sleeve 8 and the inner side wall of the second section have a second gap (the valve stem sleeve 8 is located in the first gap, and the first gap has a second gap after the valve stem sleeve 8 occupies part of the space), the first limiting piece 9 is protruded on the outer side wall of the valve stem sleeve 8 (that is, the part of the first limiting piece 9 protruding from the valve stem sleeve 8 is located in the second gap), the second limiting piece 10 protrudes from the inner side wall of the second section to the second gap, and the second limiting piece 10 can rotate around the rotation axis in the region of the second gap other than the first limiting piece 9. Among them, the valve stem sleeve 8 can be fixed on the valve stem 2 by a fixed pin 11 or the like; the second limiting piece 10 can adopt a limiting bolt, a threaded hole is arranged on the mounting sleeve 3, the limiting bolt penetrates through the threaded hole and extends into the second gap, and the limiting bolt is in threaded fastening connection with the threaded hole.

[0051] The closure plate is divided into two halves along a split line parallel to the rotation axis, and the two halves are the butterfly plates 4 in the two adjusting assemblies, respectively.

[0052] The elastic pre-tightening piece adopts a torsion spring 5, the torsion spring 5 is sleeved on the corresponding valve stem 2, and the two ends of the torsion spring 5 abut against the butterfly plate 4 in the corresponding adjusting assembly and the butterfly plate 4 in the other adjusting assembly, respectively.

[0053] Preferably, the cross section of the flow passage 7 is circular, and the rotation axis passes through the center of the circle.

[0054] The regulating valve with double-disc butterfly check function of the embodiment further comprises two valve rod actuators 1. The valve rod actuators 1 are located outside the valve body 6; the two valve rod actuators 1 are connected with the two valve rods 2 respectively, and are used to control the rotation angle of the corresponding valve rod 2 respectively to control the opening degree of the regulating valve. The valve rod actuators 1 can be handles and the like, and the valve rod actuators 1 are manually operated to drive the valve rod 2 to rotate. The valve rod actuators 1 can also be cylinders and the like, and the valve rod actuators 1 are electrically controlled to drive the valve rod 2 to rotate. The specific structure of the valve rod actuators 1 is not limited.

[0055] When the regulating valve with double-disc butterfly check function of the embodiment is in a fully open state, in the case that the medium flow direction is the allowed flow direction A (that is, from the first end to the second end of the flow passage 7), the medium pressure drives the butterfly plates 4 to rotate in the first direction B against the elastic pre-tightening force (that is, the elastic torsion force) of the torsion springs 5, and the two butterfly plates 4 move towards each other until they are close together, the flow passage 7 is opened, and the pipeline is connected, as shown in Figure 10 The valve rod actuators 1 drive the valve rods 2 to rotate in the direction opposite to the first direction B, so that the opening degree of the regulating valve is reduced (the opening degree is reduced to zero in this case), thereby adjusting the flow of the medium in the flow passage 7.

[0056] For the convenience of description, the two valve rods 2 are respectively named as a first valve rod and a second valve rod. The regulating valve with double-disc butterfly check function of the embodiment mainly has the following three ways to adjust the flow of the medium: ① the first valve rod corresponding valve rod actuator 1 drives the first valve rod to rotate, and the corresponding limit bolt is used to limit the angle at which the corresponding butterfly plate 4 can rotate in the first direction B, thereby adjusting the flow of the medium in the flow passage 7; ② the second valve rod corresponding valve rod actuator 1 drives the second valve rod to rotate, and the corresponding limit bolt is used to limit the angle at which the corresponding butterfly plate 4 can rotate in the first direction B, thereby adjusting the flow of the medium in the flow passage 7; ③ the first valve rod and the second valve rod corresponding two valve rod actuators 1 simultaneously control the first valve rod and the second valve rod, thereby adjusting the flow of the medium in the flow passage 7.

[0057] When the medium flows in the reverse direction, the two butterfly plates 4 rotate in the direction opposite to the first direction B (that is, both rotate towards the stepped surface) under the driving of the corresponding torsion spring 5 and the reverse medium pressure, until the two butterfly plates 4 are combined into a whole closed plate, at this time, the periphery of the closed plate abuts against the stepped surface, thereby cutting off the flow passage 7, as shown in Figure 11 .

[0058] Both butterfly plates 4 have respective elastic pre-tighteners, which can provide independent closing forces (the closing force is also the elastic pre-tightening force). When the regulating valve needs to be closed, during the rotation of the valve stem 2, when the rotation angle corresponding to a small opening degree is reached, the medium flow rate slows down, and the medium pressure begins to be less than the elastic pre-tightening force. The elastic pre-tightener will automatically drive the butterfly plate 4 to rotate to the step surface faster than the valve stem 2 (that is, to rotate in the direction opposite to the first direction B), thereby reducing the closing time of the regulating valve, and reducing the influence of the water hammer phenomenon. When the medium flows backward, not only the backward flowing medium will drive the butterfly plate 4 to rotate to the step surface, but also the elastic pre-tightener will drive the butterfly plate 4 to rotate to the step surface, thereby greatly increasing the dynamic response speed (here, the dynamic response refers to the automatic check function of the regulating valve when the medium flows backward) of the regulating valve, reducing the influence of the water hammer phenomenon, and achieving the non-impact performance. Experiments have proved that the regulating valve with double-valve butterfly check function of the embodiment has a service life 30% longer than that of a common butterfly valve regulating valve (only one valve stem and one butterfly plate, the butterfly plate is fixedly connected with the valve stem), and the water hammer phenomenon is reduced by 60%.

[0059] The regulating valve with double-valve butterfly check function of the embodiment has a specific check function to prevent medium backflow; has simple structure, low cost, good regulating, cutting and check functions, high regulating precision, wide regulating range, low flow resistance coefficient and large flow capacity, can effectively prevent or reduce the water hammer phenomenon, and prolong the service life of the valve.

[0060] The embodiments of the application are described in detail above in combination with the drawings, but the application is not limited to the above-described embodiments. Even if various changes are made to the application, if the changes fall within the scope of the claims of the application and equivalent technologies thereof, they still fall within the protection scope of the application.

Claims

1. A regulating valve with a double-flap butterfly check function, characterized in that: include: A valve body, wherein a flow channel is provided in the valve body, and the regulating valve allows the medium to flow from the first end to the second end of the flow channel; an inner side wall of the flow channel is provided with a step surface facing the second end of the flow channel; two valve stems, one end of each valve stem being located outside the valve body, and the other end of each valve stem passing through the valve body and extending into the circulation channel from the inner side wall of the circulation channel; and the two valve stems being arranged along the same rotation axis; Two adjustment assemblies, both located in the flow channel and respectively connected to the two valve stems; the two adjustment assemblies each have a first direction; The regulating assembly includes a butterfly plate, a mounting sleeve, and an elastic preload member, wherein the butterfly plate is fixedly connected to the mounting sleeve, and the mounting sleeve is sleeved on the corresponding valve stem and rotatably connected thereto; in the closed state of the regulating valve, the two butterfly plates in the two regulating assemblies are spliced ​​together to form a closing plate, and the surrounding surfaces of the closing plate facing the first end of the circulation channel abut against the step surface to disconnect the circulation channel, and the direction in which the butterfly plate rotates around the rotation axis toward the second end of the circulation channel from the closed state is the first direction of the regulating assembly; The elastic preload member is used to provide an elastic preload force that drives the butterfly plate to rotate in a direction opposite to the first direction; and the mounting sleeve and the valve stem are provided with a linkage structure, which is configured so that when the valve stem rotates in a direction opposite to the first direction, the valve stem drives the mounting sleeve to rotate in the same direction, and when the valve stem rotates in the first direction, the valve stem does not drive the mounting sleeve to rotate.

2. The regulating valve with double-flap butterfly check function according to claim 1, characterized in that: The linkage structure includes a first limit member and a second limit member, the first limit member is connected to the valve stem, the second limit member is connected to the mounting sleeve, and the first limit member is arranged in the first direction of the second limit member so that when the valve stem rotates in a direction opposite to the first direction until the first limit member abuts against the second limit member, the mounting sleeve is driven to rotate in the same direction.

3. The regulating valve with double-flap butterfly check function according to claim 2, characterized in that: The mounting sleeve is provided with a through hole, and the through hole is sleeved on the corresponding valve stem; the through hole has a first section and a second section arranged along the rotation axis, the first section is rotatably connected to the valve stem, and the diameter of the second section is larger than the diameter of the first section; The area on the valve stem corresponding to the second section on the mounting sleeve is the adjustment section of the valve stem. There is a first gap between the adjustment section of the valve stem and the second section. The first limiting member and the second limiting member are arranged in the first gap.

4. The regulating valve with double-flap butterfly check function according to claim 3, characterized in that: A valve stem sleeve is sleeved and fixedly connected to the adjusting section of the valve stem, and a second gap is formed between the outer side wall of the valve stem sleeve and the inner side wall of the second section; The first limiting member is protruded on the outer side wall of the valve stem sleeve, the second limiting member protrudes from the inner side wall of the second section to the second gap, and the second limiting member can rotate around the rotation axis in the area of ​​the second gap other than the first limiting member.

5. The regulating valve with double-flap butterfly check function according to claim 4, characterized in that: The second limiting member is a limiting bolt. A threaded hole is provided on the mounting sleeve. The limiting bolt passes through the threaded hole and extends into the second gap. The limiting bolt is threadedly fastened to the threaded hole.

6. The regulating valve with double-flap butterfly check function according to claim 1, characterized in that: The closing plate is divided into two halves along a dividing line parallel to the rotation axis, which are the butterfly plates in the two adjusting assemblies respectively.

7. The regulating valve with double-flap butterfly check function according to claim 6, characterized in that: The elastic preload member is a torsion spring, which is sleeved on the corresponding valve stem. Two ends of the torsion spring respectively abut against the butterfly plate in the corresponding adjustment assembly and the butterfly plate in another adjustment assembly.

8. The regulating valve with double-flap butterfly check function according to claim 1, characterized in that: One end of the valve stem located in the flow channel is the connecting end of the valve stem; among the two valve stems, a positioning connecting column is provided on the connecting end surface of one of the valve stems, and a positioning connecting groove is provided on the connecting end surface of the other valve stem, and the positioning connecting column is inserted into the positioning connecting groove to realize the connection between the two valve stems; Furthermore, the positioning connection column can rotate around the rotation axis in the positioning connection groove.

9. The regulating valve with double-flap butterfly check function according to claim 1, characterized in that: The cross section of the circulation channel is circular, and the rotation axis passes through the center of the circle.

10. The regulating valve with double-flap butterfly check function according to claim 1, characterized in that: It also includes two valve stem actuators, which are located outside the valve body; the two valve stem actuators are respectively connected to the two valve stems, and are used to respectively control the rotation angle of the corresponding valve stems to control the opening of the regulating valve.

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