Regulating valve with bivalve butterfly type non-return function

Abstract

The invention discloses an adjusting valve with a bivalve butterfly type non-return function. The adjusting valve comprises a valve body, two valve rods and two adjusting assemblies. A circulation channel is arranged in the valve body, and a step face is arranged on the circulation channel. The two valve rods are arranged along the same rotation axis, and one end of each valve rod extends into the circulation channel. The two adjusting assemblies are connected to the two valve rods in the circulation channel correspondingly. The adjusting 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 adjusting assemblies are spliced to form a closed plate, and the closed plate is connected with the step face to break the circulation channel. 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 the valve rod can drive the mounting sleeve to rotate in the same direction when rotating in the closing direction, and the valve rod does not drive the mounting sleeve to rotate when rotating in the opening direction.

Description

Technical Field

[0001] The invention belongs to the technical field of regulating valves, and in particular relates to a regulating valve with a double-flap butterfly check function. Background Art

[0002] The current straight-through control valves all have S-shaped flow channels, complex flow paths, high flow resistance, and low flow capacity. The butterfly valve control valve has low flow resistance and high flow capacity, but its flow rate is large when the opening is small, and the adjustment accuracy is low. Moreover, these two control valves do not have a check function. If the medium flows back under abnormal circumstances, it will cause great damage to the entire system. Summary of the invention

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

[0004] The technical solution of the present invention is: A regulating valve with a double-flap butterfly check function, comprising: 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; and 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 is located outside the valve body, and the other end of each valve stem passes through the valve body and extends into the circulation channel from the inner side wall of the circulation channel; and the two valve stems are arranged along the same rotation axis; Two adjustment components are both located in the circulation channel and are respectively connected to the two valve stems; the two adjustment components each have a first direction; The regulating assembly comprises a butterfly plate, a mounting sleeve and an elastic preload member, the butterfly plate is fixedly connected to the mounting sleeve, the mounting sleeve is sleeved on the corresponding valve stem and is rotatably connected thereto; in the closed state of the regulating valve, the two butterfly plates in the two regulating assemblies are assembled to form a closing plate, the surroundings 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 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, and the linkage structure 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.

[0005] Optionally, 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.

[0006] Optionally, 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 direction of 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. A first gap is provided between the adjustment section of the valve stem and the second section. The first limiting member and the second limiting member are provided in the first gap.

[0007] Optionally, a valve stem sleeve is sleeved and fixedly connected to the adjusting section of the valve stem, and a second gap is provided between the outer side wall of the valve stem sleeve and the inner side wall of the second section; The first limiter is protruded on the outer side wall of the valve stem sleeve, the second limiter protrudes from the inner side wall of the second section to the second gap, and the second limiter can rotate around the rotation axis in a region of the second gap other than the first limiter.

[0008] Optionally, the second limiting member is a limiting bolt, and a threaded hole is provided on the mounting sleeve. The limiting bolt passes through the threaded hole and extends into the second gap, and the limiting bolt is threadedly fastened to the threaded hole.

[0009] Optionally, the closing plate is divided into two halves along a dividing line parallel to the rotation axis, which are respectively the butterfly plates in the two adjusting assemblies.

[0010] Optionally, the elastic preload member is a torsion spring, which is sleeved on the corresponding valve stem, and two ends of the torsion spring respectively abut against the butterfly plate in the corresponding adjusting assembly and the butterfly plate in another adjusting assembly.

[0011] Optionally, 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 end surface of the connecting end of one of the valve stems, and a positioning connecting groove is provided on the end surface of the connecting end of the other valve stem, and the positioning connecting column is inserted into the positioning connecting groove to realize the connection of the two valve stems; Furthermore, the positioning connection column can rotate around the rotation axis in the positioning connection groove.

[0012] Optionally, the cross-section of the circulation channel is circular, and the rotation axis passes through the center of the circle.

[0013] Optionally, two valve stem actuators are further included, and the valve stem actuators 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 angles of the corresponding valve stems to control the opening of the regulating valve.

[0014] Due to the adoption of the above technical solution, the present invention has the following advantages and positive effects compared with the prior art: The regulating valve with a double-flap butterfly check function provided by the present invention controls the opening of the regulating valve by driving the valve stem to rotate in a first direction. After the valve stem rotates to an angle corresponding to the required opening, the medium pressure pushes the butterfly plate to overcome the elastic preload force of the elastic preload component and rotate in the first direction, thereby realizing the circulation of the medium.

[0015] The regulating valve with double-flap butterfly check function provided by the present invention has two butterfly plates (one butterfly plate in each of the two regulating components) respectively connected to the two valve stems and independently controlled. Only one of the butterfly plates can be opened, and the two butterfly plates can also be opened at the same time, or one butterfly plate can be opened first and then the other butterfly plate. Therefore, the regulating valve of the present invention has the advantages of high regulating accuracy and large flow capacity.

[0016] The regulating valve with double-flap butterfly check function provided by the present invention has only two valve stems, two butterfly plates and two elastic preload members in the flow channel, has a low flow resistance coefficient and a high flow capacity. When the medium flows in the normal direction (that is, from the first end to the second end of the flow channel), the butterfly plate is opened, which has little effect on the flow capacity of the regulating valve.

[0017] In the regulating valve with double-flap butterfly check function provided by the present invention, when the medium flows back, the elastic preload force of the elastic preload member will drive the butterfly plate to rotate in the direction opposite to the first direction, so that the butterfly plate is closed; at the same time, the pressure of the backflowing medium will also push the butterfly plate to rotate in the direction opposite to the first direction. Therefore, the regulating valve of the present invention can be closed in time in the case of backflow of the medium, cut off the backflow of the medium, and prevent accidents from occurring.

[0018] The regulating valve with double-flap butterfly check function provided by the present invention has two butterfly plates with their own corresponding elastic preload parts, and the elastic preload parts can provide independent closing force (closing force is also elastic preload force). When the regulating valve needs to be closed, in the process of rotating the valve stem, when it is rotated to the angle corresponding to the smaller opening, the medium flow rate slows down, and the medium pressure begins to be less than the elastic preload force. The elastic preload part will automatically drive the butterfly plate to rotate toward the step surface faster than the valve stem (that is, rotate in the direction opposite to the first direction), thereby reducing the closing time of the regulating valve. When the medium flows back, not only the backflowing medium will drive the butterfly plate to rotate toward the step surface, but the elastic preload part will also drive the butterfly plate to rotate in the direction of the step surface, thereby greatly increasing the dynamic response speed of the regulating valve (the dynamic response here refers to the automatic check function of the regulating valve when the medium flows back) and reducing the influence of the water hammer phenomenon, thereby achieving impact-free performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the following detailed description of the preferred embodiment.The drawings are only for the purpose of illustrating the preferred embodiments and are not to be construed as limiting the invention.

[0020] Figure 1 It is a schematic cross-sectional structure diagram of a regulating valve with a double-flap butterfly check function according to the present invention; Figures 2 to 4 It is a schematic diagram of a regulating valve with a double-flap butterfly check function according to the present invention under three opening degrees corresponding to the first valve stem when the medium is allowed to flow; Figure 5 It is a schematic cross-sectional structure diagram of a regulating valve with a double-flap butterfly check function at a first valve stem of the present invention; Figures 6 to 8 It is a schematic diagram of a regulating valve with a double-flap butterfly check function according to the present invention under three opening degrees corresponding to the second valve stem when the medium allows the flow direction; Fig. 9 It is a schematic cross-sectional structure diagram of a regulating valve with a double-flap butterfly check function at the second valve stem of the present invention; Fig.10 It is a schematic structural diagram of a regulating valve with a double-flap butterfly check function in a flow channel of the present invention; Fig.11 It is a schematic diagram of the structure of a regulating valve with a double-flap butterfly check function located in a flow channel when closed according to the present invention.

[0021] Description of reference numerals: 1: valve stem actuator; 2: valve stem; 3: mounting sleeve; 4: butterfly plate; 5: torsion spring; 6: valve body; 7: flow channel; 8: valve stem sleeve; 9: first limiter; 10: second limiter; 11: fixing pin; A: medium allowed flow direction; B: first direction. DETAILED DESCRIPTION

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0023] In order to simplify the drawings, only the parts related to the present invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0024] See also Figures 1 to 11 This embodiment provides a regulating valve with a double-flap butterfly check function, including a valve body 6, two valve stems 2 and two regulating assemblies. A circulation channel 7 is provided in the valve body 6, and the regulating valve allows the medium to flow from the first end of the circulation channel 7 to the second end; a step surface facing the second end of the circulation channel 7 is provided on the inner side wall of the circulation channel 7. One end of the valve stem 2 is located outside the valve body 6, and the other end of the valve stem 2 passes through the valve body 6 and extends into the circulation channel 7 from the inner side wall of the circulation channel 7; and the two valve stems 2 are arranged along the same rotation axis. Two regulating assemblies are both located in the circulation channel 7 and are respectively connected to the two valve stems 2; the two regulating assemblies each have their own first direction B.

[0025] The regulating assembly includes a butterfly plate 4, a mounting sleeve 3 and an elastic preload member. The butterfly plate 4 is fixedly connected to the mounting sleeve 3. The mounting sleeve 3 is sleeved on the corresponding valve stem 2 and is rotatably connected thereto. In the closed state of the regulating valve, the two butterfly plates 4 in the two regulating assemblies are assembled to form a closing plate. The surrounding surfaces of the closing plate facing the first end of the circulation channel 7 abut against the step surface to disconnect the circulation channel 7. The direction in which the butterfly plate 4 rotates around the rotation axis toward the second end of the circulation channel 7 from the closed state is the first direction B of the regulating assembly (the first directions B of the two regulating assemblies are opposite from the perspective of the regulating valve, that is, based on the perspective of the regulating valve, the first direction B of one regulating assembly is clockwise, and the first direction B of the other regulating assembly is counterclockwise). When the butterfly plate 4 rotates in the direction opposite to the first direction B, it is the butterfly plate 4 rotating in the direction of the step surface. When the regulating valve opening increases, the butterfly plate 4 rotates in the first direction B; when the regulating valve opening decreases, the butterfly plate 4 rotates in the direction opposite to the first direction B, that is, it rotates in the direction of the step surface.

[0026] The elastic preload member is used to provide an elastic preload force for driving the butterfly plate 4 to rotate in a direction opposite to the first direction B. The mounting sleeve 3 and the valve stem 2 are provided with a linkage structure, and the linkage structure is configured such that when the valve stem 2 rotates in a direction opposite to the first direction B, the valve stem 2 drives the mounting sleeve 3 to rotate in the same direction, and when the valve stem 2 rotates in the first direction B, the valve stem 2 does not drive the mounting sleeve 3 to rotate.

[0027] The regulating valve with double-flap butterfly check function of this embodiment is further described below.

[0028] One end of the valve stem 2 located in the flow channel 7 is the connection end of the valve stem 2. Among the two valve stems 2, a positioning connection column is provided on the connection end face of one valve stem 2, and a positioning connection groove is provided on the connection end face of the other valve stem 2. The positioning connection column is inserted into the positioning connection groove to achieve the connection of the two valve stems 2; and the positioning connection column can rotate around the rotation axis in the positioning connection groove. In this way, the two valve stems 2 are arranged along the rotation axis, and the connection ends of the two valve stems 2 are abutted to form an integral rod-shaped component, and the rotation of the two valve stems 2 can be controlled separately.

[0029] The butterfly plate 4 and the mounting sleeve 3 may be made in one piece; of course, the butterfly plate 4 and the mounting sleeve 3 may also be fixedly connected by fastener connection, key connection, snap connection, etc.

[0030] The linkage structure includes a first limit member 9 and a second limit member 10. The first limit member 9 is connected to the valve stem 2, and the second limit member 10 is connected to the mounting sleeve 3. The first limit member 9 is arranged in the first direction B of the second limit member 10 so that when the valve stem 2 rotates in a direction opposite to the first direction B until the first limit member 9 abuts against the second limit member 10, it drives the mounting sleeve 3 to rotate in the same direction.

[0031] Specifically, the installation sleeve 3 is provided with a through hole, which is sleeved on the corresponding valve stem 2; the through hole has a first section and a second section arranged along the rotation axis direction, the first section is rotatably connected to the valve stem 2, and the diameter of the second section is larger than the diameter of the first section. The area on the valve stem 2 corresponding to the second section on the installation sleeve 3 is the adjustment section of the valve stem 2, and there is a first gap between the adjustment section and the second section of the valve stem 2, and the first limiter 9 and the second limiter 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 opening of the regulating valve is reduced), the valve stem 2 drives the first limiter 9 to rotate, the first limiter 9 abuts against the second limiter 10 and pushes the second limiter 10 to rotate, and the second limiter 10 drives the installation sleeve 3 and the butterfly plate 4 fixed to the installation sleeve 3 to rotate; when the valve stem 2 rotates in the first direction B (that is, the opening of the regulating valve is increased), the butterfly plate 4 rotates in the first direction B under the action of the medium pressure until it rotates to the second limiter 10 abuts against the first limiter 9. The area where the first limiting member 9 and the second limiting member 10 rotate is the first gap.

[0032] More specifically, a valve stem sleeve 8 is sleeved and fixedly connected on the adjustment section of the valve stem 2, and a second gap is provided between the outer wall of the valve stem sleeve 8 and the inner wall of the second section (the valve stem sleeve 8 is located in the first gap, and the second gap remains after the first gap is partially occupied by the valve stem sleeve 8); the first limiter 9 is protruded on the outer wall of the valve stem sleeve 8 (that is, the part of the first limiter 9 protruding from the valve stem sleeve 8 is located in the second gap), and the second limiter 10 protrudes from the inner wall of the second section to the second gap, and the second limiter 10 can rotate around the rotation axis in the non-first limiter 9 area of ​​the second gap. Among them, the valve stem sleeve 8 can be fixed on the valve stem 2 by means of a fixing pin 11 or the like; the second limiter 10 can be a limiter bolt, and a threaded hole is provided on the mounting sleeve 3, and the limiter bolt passes through the threaded hole and then extends into the second gap, and the limiter bolt is threadedly fastened to the threaded hole.

[0033] The closing plate is divided into two halves along a dividing line parallel to the rotation axis, which are butterfly plates 4 in two adjusting assemblies.

[0034] The elastic preload member is a torsion spring 5, which is sleeved on the corresponding valve stem 2, and two ends of the torsion spring 5 respectively abut against the butterfly plate 4 in the corresponding adjustment component and the butterfly plate 4 in another adjustment component.

[0035] Preferably, the cross section of the circulation channel 7 is circular, and the rotation axis passes through the center of the circle.

[0036] The regulating valve with double-flap butterfly check function of this embodiment also includes two valve stem actuators 1. The valve stem actuator 1 is located outside the valve body 6; the two valve stem actuators 1 are respectively connected to the two valve stems 2, and are used to respectively control the rotation angle of the corresponding valve stems 2 to control the opening of the regulating valve. The valve stem actuator 1 can be a handle, etc., and the valve stem actuator 1 is manually operated to drive the valve stem 2 to rotate. The valve stem actuator 1 can also be a cylinder, etc., and the valve stem 2 is driven to rotate through electric control. The specific structure of the valve stem actuator 1 is not limited.

[0037] When the regulating valve with double-flap butterfly check function of this embodiment is in a fully open state, when the medium flows in the permitted flow direction A (i.e., flows from the first end to the second end of the flow channel 7), the medium pressure pushes the butterfly plate 4 to overcome the elastic preload force (i.e., elastic torsion force) of the torsion spring 5 and rotate in the first direction B, the two butterfly plates 4 will move toward each other until they are close together, the flow channel 7 is opened, and the pipeline is connected, such as Fig.10 The valve stem actuator 1 drives the valve stem 2 to rotate in a direction opposite to the first direction B, so that the opening of the regulating valve is reduced (here, the opening reduction includes the opening reduction to zero), thereby adjusting the flow rate of the medium in the flow channel 7.

[0038] For ease of description, the two valve stems 2 are named the first valve stem and the second valve stem respectively. The regulating valve with double-flap butterfly check function of this embodiment mainly has the following three ways to adjust the medium flow: ① The valve stem actuator 1 corresponding to the first valve stem drives the first valve stem to rotate, and the corresponding limit bolt is used to limit the angle that the corresponding butterfly plate 4 can rotate in the first direction B, so as to adjust the medium flow in the circulation channel 7; ② The valve stem actuator 1 corresponding to the second valve stem drives the second valve stem to rotate, and the corresponding limit bolt is used to limit the angle that the corresponding butterfly plate 4 can rotate in the first direction B, so as to adjust the medium flow in the circulation channel 7; ③ The two valve stem actuators 1 corresponding to the first valve stem and the second valve stem simultaneously control the first valve stem and the second valve stem, so as to adjust the medium flow in the circulation channel 7.

[0039] When the medium flows backward, the two butterfly plates 4 rotate in the direction opposite to the first direction B (that is, both in the direction of the step surface) under the push of the corresponding torsion springs 5 ​​and the pressure of the counterflow medium, until the two butterfly plates 4 are assembled into a whole closing plate. At this time, the surrounding of the closing plate abuts against the step surface, thereby cutting off the flow channel 7. Fig.11 shown.

[0040] Both butterfly plates 4 have their own corresponding elastic preloads, which can provide independent closing forces (closing forces are also elastic preloads). When the regulating valve needs to be closed, during the process of rotating the valve stem 2, when the valve stem 2 is rotated to an angle corresponding to a smaller opening, the medium flow rate slows down, and the medium pressure begins to be less than the elastic preload. The elastic preload will automatically drive the butterfly plate 4 to rotate toward 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 impact of the water hammer phenomenon. When the medium flows back, not only will the backflowing medium drive the butterfly plate 4 to rotate toward the step surface, but the elastic preload will also drive the butterfly plate 4 to rotate in the direction of the step surface, thereby greatly increasing the dynamic response speed of the regulating valve (the dynamic response here refers to the automatic non-return function of the regulating valve when the medium flows back), reducing the impact of the water hammer phenomenon, and achieving impact-free performance. Experiments have shown that the regulating valve with double-flap butterfly check function in this embodiment has a 30% longer life and a 60% reduction in water hammer phenomenon compared to an ordinary butterfly valve regulating valve (with only one valve stem and one butterfly plate, and the butterfly plate is fixedly connected to the valve stem).

[0041] The regulating valve with double-flap butterfly check function of this embodiment has a check function to prevent the backflow of the medium; it has a simple structure, low cost, good adjustment, cut-off and check functions, high adjustment accuracy, and a wide adjustment range; it has a low flow resistance coefficient and a large flow capacity, which can effectively prevent or reduce the occurrence of water hammer and extend the service life of the valve.

[0042] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Even if various changes are made to the present invention, if these changes fall within the scope of the claims of the present invention and their equivalents, they still fall within the protection scope of the present invention.

Claims

1. A regulating valve with 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; and 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 is located outside the valve body, and the other end of each valve stem passes through the valve body and extends into the circulation channel from the inner side wall of the circulation channel; and the two valve stems are arranged along the same rotation axis; Two adjustment components are both located in the circulation channel and are respectively connected to the two valve stems; the two adjustment components each have a first direction; The regulating assembly comprises a butterfly plate, a mounting sleeve and an elastic preload member, the butterfly plate is fixedly connected to the mounting sleeve, the mounting sleeve is sleeved on the corresponding valve stem and is rotatably connected thereto; in the closed state of the regulating valve, the two butterfly plates in the two regulating assemblies are assembled to form a closing plate, the surroundings 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 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, and the linkage structure 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 direction of 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. A first gap is provided between the adjustment section of the valve stem and the second section. The first limiting member and the second limiting member are provided in the first gap.

4. The regulating valve with double-flap butterfly check function according to claim 2, characterized in that: A valve stem sleeve is sleeved and fixedly connected on the adjusting section of the valve stem, and a second gap is provided between the outer side wall of the valve stem sleeve and the inner side wall of the second section; The first limiter is protruded on the outer side wall of the valve stem sleeve, the second limiter protrudes from the inner side wall of the second section to the second gap, and the second limiter can rotate around the rotation axis in a region of the second gap other than the first limiter.

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, and a threaded hole is provided on the mounting sleeve. The limiting bolt passes through the threaded hole and extends into the second gap, and 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, and two ends of the torsion spring respectively abut against the butterfly plate in the corresponding adjusting assembly and the butterfly plate in another adjusting 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 end surface of one of the valve stems, and a positioning connecting groove is provided on the connecting end end surface of the other valve stem, and the positioning connecting column is inserted into the positioning connecting groove to realize the connection of 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 angles of the corresponding valve stems to control the opening of the regulating valve.

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