Low torque butterfly valve

Abstract

This invention provides a low-torque butterfly valve, comprising: a valve body, a valve seat, a valve plate, and a valve stem. The width of the valve seat gradually increases from the rotational connection point between the valve stem and the valve body, extending circumferentially along the medium channel. By providing a valve seat with a gradually increasing width starting from the rotational connection point between the valve stem and the valve body, extending circumferentially along the medium channel, the butterfly valve shown in this invention ensures that the valve plate only comes into contact with the valve seat when the valve plate is closed to a set angle during opening and closing. Compared to the uniformly raised valve seat sealing surface of conventional rubber-lined butterfly valves, this design avoids the problem of significant friction between the valve plate and the valve seat during opening and closing, effectively reducing torque and frictional wear during the opening and closing process, and significantly improving the performance of the rubber-lined butterfly valve.

Description

Technical Field

[0001] This utility model relates to the field of valve technology, and in particular to a low-torque butterfly valve. Background Technology

[0002] Compared to eccentric butterfly valves, centerline rubber-lined butterfly valves have the advantages of simple structure, no need for special tooling during manufacturing, and low requirements for processing equipment. Therefore, their production cost is very low. Furthermore, because centerline rubber-lined butterfly valves use a soft seal, they can achieve zero leakage, making them widely used in industries with high sealing requirements, such as nuclear power. Therefore, centerline rubber-lined butterfly valves have significant market value.

[0003] Currently, existing centerline rubber-lined butterfly valves experience significant compression friction between the valve plate and seat during operation, especially near the upper and lower positions where the valve stem and seat contact. Frictional wear occurs between the valve plate and seat at any angle during the valve plate's opening and closing process. As the valve plate gradually closes further away from the upper and lower positions of the seat, the magnitude of compression friction increases. Therefore, the lifespan of centerline rubber-lined butterfly valves is shorter than that of eccentric butterfly valves. Summary of the Invention

[0004] This invention provides a low-torque butterfly valve to solve the technical problem that existing centerline rubber-lined butterfly valves have friction between the valve plate and valve seat at any opening angle during the opening and closing process, and the area of ​​pressure friction between the valve plate and valve seat gradually increases as the valve plate gradually closes, resulting in a shorter lifespan for centerline rubber-lined butterfly valves compared to eccentric butterfly valves.

[0005] This utility model provides a low-torque butterfly valve, the low-torque butterfly valve comprising:

[0006] The valve body is equipped with a medium passage;

[0007] The valve seat is located on the side wall of the medium passage.

[0008] A valve plate, located within the medium channel, is used to press against the valve seat to seal the medium channel;

[0009] A valve stem extends radially along the valve plate and passes through the valve plate, rotatably connecting to the valve body. The valve stem is used to drive the valve plate to rotate, so that the valve plate opens or closes the medium passage.

[0010] Specifically, the width of the valve seat gradually increases from the rotatable connection position between the valve stem and the valve body along the circumferential extension direction of the medium channel.

[0011] In one embodiment of the present invention, an actuator is further included. The actuator is connected to the valve stem and is used to drive the valve stem to rotate, thereby causing the valve plate to rotate and opening or closing the medium channel.

[0012] In one embodiment of this utility model, the valve seat is a flexible valve seat.

[0013] In one embodiment of the present invention, the valve plate is provided with a through-channel for inserting a valve stem.

[0014] In one embodiment of the present invention, the valve body is provided with a positioning seat, which is used for positioning and installing the valve plate.

[0015] In one embodiment of this utility model, the positioning seat is a cylindrical positioning seat, and the outer diameter of the positioning seat is smaller than the through-channel.

[0016] In one embodiment of this utility model, a rotating hole is provided on the positioning seat coaxially with the through hole, and the rotating hole is used to rotatably connect the valve stem.

[0017] In one embodiment of the present invention, a pin is provided between the valve stem and the valve plate, and the valve plate and the valve stem are connected by the pin.

[0018] In one embodiment of the present invention, the valve stem is interference-fitted with the through-channel, and the valve stem is provided with a protrusion, which is clearance-fitted with the rotating hole.

[0019] In one embodiment of the present invention, the valve body is provided with an end cap, and a sealing component is provided between the valve body and the end cap. The valve stem passes through the end cap and is connected to the actuator. The sealing component is used to seal the gap between the valve stem and the valve body.

[0020] The beneficial effects of this utility model are as follows: This utility model proposes a low-torque butterfly valve. By providing a valve seat with a gradually increasing width along the circumferential extension direction of the medium channel at the rotational connection point between the valve stem and the valve body on the side wall of the medium channel, the valve plate only comes into contact with the valve seat when it is closed to a set angle during the opening and closing process. Compared to the uniformly raised valve seat sealing surface of conventional rubber-lined butterfly valves, this avoids the problem of significant friction between the valve plate and the valve seat during opening and closing, effectively reducing torque and frictional wear during the opening and closing process of the centerline rubber-lined butterfly valve, and effectively improving its performance. Attached Figure Description

[0021] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application. It is obvious that the drawings described below are merely some embodiments of this application, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort.

[0022] In the attached diagram:

[0023] Figure 1 This is a schematic diagram of the structure of a low-torque butterfly valve provided in an embodiment of the present invention;

[0024] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure of the middle AA section;

[0025] Figure 3 This is a schematic diagram of the valve body and valve seat in a low-torque butterfly valve provided in one embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the valve plate in a low-torque butterfly valve provided in one embodiment of the present invention.

[0027] The attached figures are labeled as follows:

[0028] Valve body 1, medium passage 101, positioning seat 102, rotating hole 102a, valve seat 2, valve plate 3, through passage 301, valve stem 4, pin 5, end cover 6, sealing component 7. Detailed Implementation

[0029] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. Various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0030] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of the present invention. The drawings only show the components related to the present invention and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0031] In the following description, numerous details are explored to provide a more thorough explanation of embodiments of the present invention. However, it will be apparent to those skilled in the art that embodiments of the present invention may be practiced without these specific details. In other embodiments, well-known structures and devices are shown in block diagram form rather than in detail to avoid obscuring embodiments of the present invention.

[0032] Please combine Figures 1 to 4 As shown, this utility model provides a low-torque butterfly valve.

[0033] In an exemplary embodiment of this application, the valve body 1 has a medium channel 101; the valve seat 2 is disposed on the side wall of the medium channel 101; the valve plate 3 is located inside the medium channel 101, and the valve plate 3 is used to press against the valve seat 2 to seal the medium channel 101; the valve stem 4 extends radially along the valve plate 3 and passes through the valve plate 3 to be rotatably connected to the valve body 1, and the valve stem 4 is used to drive the valve plate 3 to rotate so that the valve plate 3 opens or closes the medium channel 101; wherein, from the position where the valve stem 4 is rotatably connected to the valve body 1, the width of the valve seat 2 gradually increases along the circumferential extension direction of the medium channel 101.

[0034] In this embodiment, by providing a valve seat 2 with a gradually increasing width along the circumferential extension direction of the medium channel 101 at the rotatable connection position between the valve stem 4 and the valve body 1 on the side wall of the medium channel 101, the butterfly valve shown in this utility model ensures that the valve plate 3 only comes into contact with the valve seat 2 when the valve plate 3 is closed to a set angle during the opening and closing process. Compared to the uniformly raised sealing surface of the valve seat 2 in conventional rubber-lined butterfly valves, this avoids the problem of significant friction between the valve plate 3 and the valve seat 2 during the opening and closing process, thereby effectively reducing the torque and frictional wear of the centerline rubber-lined butterfly valve during opening and closing, and effectively improving the performance of the centerline rubber-lined butterfly valve.

[0035] In an exemplary embodiment of this application, an actuator is also included. The actuator is connected to the valve stem 4 and is used to drive the valve stem 4 to rotate, thereby causing the valve plate 3 to rotate and opening or closing the medium passage 101.

[0036] In this embodiment, since the valve seat 2 is designed to gradually increase in width along the circumferential extension direction of the medium channel 101 at the rotational connection position between the valve stem 4 and the valve body 1, the valve plate 3 only comes into contact with the valve seat 2 when the valve plate 3 is closed to a set angle. In the open and closed position where the valve plate 3 and the valve seat 2 are not in contact, the actuator only needs to output a low torque to drive the valve plate 3 to rotate, thereby effectively reducing the energy consumption of the actuator.

[0037] In an exemplary embodiment of this application, the valve seat 2 is a flexible valve seat 2.

[0038] In this embodiment, the valve seat 2 includes, but is not limited to, a flexible valve seat 2 made of rubber, so that when the valve plate 3 contacts and squeezes the valve seat 2, the valve seat 2 deforms, thereby achieving a sealing effect on the medium channel 101.

[0039] In an exemplary embodiment of this application, the valve plate 3 is provided with a through channel 301 for passing through the valve stem 4.

[0040] In this embodiment, the through channel 301 is opened radially along the valve plate 3, and the valve stem 4 passes through the through channel 301 and is rotatably connected to the valve body 1.

[0041] In an exemplary embodiment of this application, the valve body 1 is provided with a positioning seat 102, which is used to position and install the valve plate 3.

[0042] In this embodiment, by providing a positioning seat 102 on the valve body 1, the valve plate 3 can be quickly positioned and installed with the valve body 1, which effectively improves the installation efficiency.

[0043] In an exemplary embodiment of this application, the positioning seat 102 is a cylindrical positioning seat 102, and the outer diameter of the positioning seat 102 is smaller than that of the through channel 301.

[0044] In this embodiment, by designing the positioning seat 102 as a cylinder and the outer diameter of the positioning seat 102 being smaller than the through channel 301, the valve plate 3 can cooperate with the positioning seat 102 through the through channel 301 to achieve the positioning and installation of the valve plate 3 and the valve body 1.

[0045] In an exemplary embodiment of this application, a rotating hole 102a is provided on the positioning seat 102 coaxially with the through hole, and the rotating hole 102a is used to rotate and connect the valve stem 4.

[0046] In this embodiment, by opening a rotating hole 102a on the positioning seat 102, when the valve stem 4 passes through the through-channel 301 on the valve plate 3 and engages with the rotating hole 102a, a rotating connection between the valve stem 4 and the valve body 1 can be achieved. The outer diameter of the valve stem 4 is smaller than the inner diameter of the rotating hole 102a.

[0047] In an exemplary embodiment of this application, a pin 5 is provided between the valve stem 4 and the valve plate 3, and the valve plate 3 and the valve stem 4 are connected by the pin 5.

[0048] In this embodiment, the valve plate 3 and the valve stem 4 are fixedly connected by a pin 5, so that the valve stem 4 can drive the valve plate 3 to rotate.

[0049] In an exemplary embodiment of this application, the valve stem 4 is interference-fitted with the through channel 301, and the valve stem 4 is provided with a protrusion that is clearance-fitted with the rotating hole 102a.

[0050] In this embodiment, the valve stem 4 is fixedly connected to the valve plate 3 by an interference fit with the through channel 301, thereby enabling the valve stem 4 to drive the valve plate 3 to rotate; the valve stem 4 is rotated to the valve body 1 by a clearance fit between the protrusion on the axial end and the rotating hole 102a.

[0051] In an exemplary embodiment of this application, the valve body 1 is provided with an end cap 6, and a sealing component 7 is provided between the valve body 1 and the end cap 6. The valve stem 4 passes through the end cap 6 and is connected to the actuator. The sealing component 7 is used to seal the gap between the valve stem 4 and the valve body 1.

[0052] In this embodiment, the end cap 6 and the valve body 1 are connected by bolts. The bolt connection causes the end cap 6 to press against the sealing component 7, providing a sealing preload force to the sealing component 7. This causes the sealing component 7 to undergo elastic deformation, thereby sealing the gap between the valve stem 4 and the valve body 1. The sealing component 7 includes, but is not limited to, a sealing ring.

[0053] In another exemplary embodiment, valve plates 3 of different sizes and specifications can be selected according to the medium pressure under different working conditions to reduce the working torque of the actuator, thereby reducing the overall configuration cost of the centerline rubber-lined butterfly valve.

[0054] For example, since the centerline rubber-lined butterfly valve is sealed by the protrusion of the valve plate 3 and the rubber valve seat 2, when the extrusion amount is large, good sealing performance can be guaranteed in the range of low pressure difference to high pressure difference. However, the opening and closing torque of the butterfly valve will also increase accordingly, resulting in a larger actuator configuration, which increases the cost of the butterfly valve. In addition, the friction and wear between the valve seat 2 and the valve plate 3 will also increase, leading to a reduction in the service life of the butterfly valve.

[0055] Therefore, to improve the service life of the rubber-lined butterfly valve and reduce costs, the extrusion amount between the valve plate 3 and the valve seat 2 is designed according to different pressure differentials. When the pressure differential is within the range of 0.6MPa, 1MPa, and 1.6MPa, the outer circle dimensions of the contact position between the valve plate 3 and the valve seat 2 are D+L, D+2L, and D+3L, respectively, where D is the inner diameter of the valve seat 2 and L is the radial extrusion amount between the valve plate 3 and the valve seat 2. In the low pressure differential range of 0.6MPa, the radial extrusion amount between the valve plate 3 and the valve seat 2 is L; in the range of 0.7 to 1MPa, the radial extrusion amount is 2L; and in the range of 1.1MPa to 1.6MPa, the radial extrusion amount is 3L. For non-metallic materials, the greater the deformation, the smaller the extrusion amount can be achieved. By designing the sealing outer diameter of the valve plate 3 according to different pressure differentials, the radial compression of the butterfly valve with the valve seat 2 can be reduced when the pressure differential is low. While ensuring sealing, the friction between the valve plate 3 and the valve seat 2 can be effectively reduced, thereby reducing the torque of the actuator, and thus reducing the configuration of the actuator and the overall cost.

[0056] The working principle involves a valve seat 2, located on the side wall of the medium channel 101 at the rotatable connection point between the valve stem 4 and the valve body 1, with its width gradually increasing along the circumferential extension direction of the medium channel 101. This ensures that during the opening and closing process of the butterfly valve shown in this invention, the valve plate 3 only comes into contact with the valve seat 2 when it is closed to a set angle. Compared to the uniformly raised sealing surface of the valve seat 2 in conventional rubber-lined butterfly valves, this avoids the problem of significant friction between the valve plate 3 and the valve seat 2 during the opening and closing process. This effectively reduces the torque and frictional wear during the opening and closing of the centerline rubber-lined butterfly valve, thus significantly improving its performance.

[0057] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

Claims

1. A low torque butterfly valve characterized by, include: The valve body is equipped with a medium passage; Valve seat, located on the side wall of the medium passage; A valve plate, located within the medium channel, is used to press against the valve seat to seal the medium channel; A valve stem extends radially along the valve plate and passes through the valve plate, rotatably connecting to the valve body. The valve stem is used to drive the valve plate to rotate, so that the valve plate opens or closes the medium passage. Specifically, the width of the valve seat gradually increases from the rotatable connection position between the valve stem and the valve body along the circumferential extension direction of the medium channel.

2. The low-torque butterfly valve according to claim 1, characterized in that: It also includes an actuator connected to the valve stem, which drives the valve stem to rotate, thereby causing the valve plate to rotate and opening or closing the medium channel.

3. The low-torque butterfly valve according to claim 1, characterized in that: The valve seat is a flexible valve seat.

4. The low-torque butterfly valve according to claim 1, characterized in that: The valve plate is provided with a through-passage for inserting the valve stem.

5. The low-torque butterfly valve according to claim 4, characterized in that: The valve body is provided with a positioning seat, which is used to position and install the valve plate.

6. The low-torque butterfly valve according to claim 5, characterized in that: The positioning seat is a cylindrical positioning seat, and the outer diameter of the positioning seat is smaller than the through-channel.

7. The low-torque butterfly valve according to claim 6, characterized in that: The positioning seat has a rotating hole coaxial with the through hole, and the rotating hole is used to rotatably connect the valve stem.

8. The low-torque butterfly valve according to claim 1, characterized in that: A pin is provided between the valve stem and the valve plate, and the valve plate and the valve stem are connected by the pin.

9. The low-torque butterfly valve according to claim 7, characterized in that: The valve stem is interference-fitted with the through-channel, and the valve stem has a protrusion that is clearance-fitted with the rotating hole.

10. The low-torque butterfly valve according to claim 2, characterized in that: The valve body is provided with an end cap, and a sealing component is provided between the valve body and the end cap. The valve stem passes through the end cap and is connected to the actuator. The sealing component is used to seal the gap between the valve stem and the valve body.

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