A device and method for measuring the sealing surface of a triple offset butterfly valve disc

Abstract

The application provides a three-eccentric butterfly valve disc sealing surface measuring device and a measuring method, the measuring device comprises an inclined tire, a valve disc tire, a valve disc piece to be detected, a valve disc measuring scale and a measuring body; the measuring body comprises a valve rod hole positioning shaft, a sliding groove column and a measuring cantilever, the valve rod hole positioning shaft and the sliding groove column are respectively located at two ends of the measuring cantilever; the valve disc piece to be detected is provided with a valve rod hole, a guide hole is arranged at a position corresponding to the valve rod hole on the valve disc tire, the valve rod hole positioning shaft is sequentially passed through and rotationally installed in the guide hole and the valve rod hole, and the valve rod hole positioning shaft is coaxially installed with the valve rod hole and the guide hole; one end of the valve disc measuring scale is slidingly installed on the sliding groove column, and the other end can be in contact with a valve disc sealing surface of the valve disc piece to be detected. The technical scheme of the application relates to simple measurement data measurement and processing, and improves the measurement efficiency.

Description

Technical Field

[0001] This invention relates to the field of measurement technology for triple eccentric butterfly valves, and more particularly to a measuring device and method for measuring the sealing surface of a triple eccentric butterfly valve disc. Background Technology

[0002] Triple offset butterfly valves are widely used in pipeline transportation and many other applications, ranging from small-scale agricultural irrigation and natural gas / water supply to large-scale industrial sectors such as oil and gas extraction, offshore platforms, oil refining, petrochemicals, inorganic chemicals, and power generation. They function to regulate flow and cut off fluid flow. Triple offset butterfly valves can reach a maximum pressure rating of 2500 psi, withstand temperatures from -196°C to 700°C, adapt to various corrosive environments, and offer a wide range of material choices, including wafer, lug, flange, ring, butt weld, and jacketed designs. They can also achieve zero leakage. Especially in large-diameter applications, their superior regulating performance is leading to their increasing replacement of bulky gate valves in control valves and their growing adoption of large ball valves and gate valves in shut-off valves. In various important, harsh, and critical process control pipelines, whether gate valves or control valves, if properly selected, triple offset butterfly valves can currently replace them at a low cost. The triple eccentric butterfly valve combines the advantages of various valves while eliminating their disadvantages, making it a rising star in the valve industry and highly valued by users and designers.

[0003] Machining the sealing surface of the triple eccentric butterfly valve disc is one of the key processes in the manufacturing of triple eccentric butterfly valves. The machining accuracy of the sealing surface has a significant impact on subsequent assembly. This leads to increasingly higher requirements for the measurement and inspection of the dimensions of the triple eccentric butterfly valve disc sealing surface, and consequently, higher demands are placed on the accuracy and ease of measurement of the measuring tools for the dimensions of the triple eccentric butterfly valve disc sealing surface.

[0004] The sealing surface of a triple eccentric butterfly valve can be considered as an elliptical cross-section formed by two parallel planes obliquely cutting a cone. Commonly used methods for measuring the sealing surface dimensions of triple eccentric butterfly valve discs in existing technologies include conventional dedicated measuring tools, coordinate measuring machines (CMMs), and tapered hole measuring standard parts. Conventional online measurement of the valve disc sealing surface dimensions using conventional measuring tools results in large errors, failing to meet production and processing requirements. CMMs cannot perform measurements during processing, requiring workpiece disassembly, which affects machining accuracy. Measuring with tapered hole measuring standard parts requires further conversion using complex formulas, making both the measurement and calculation methods cumbersome. Summary of the Invention

[0005] To address the problems existing in current measurement technologies, this invention provides a device and method for measuring the sealing surface of a triple eccentric butterfly valve disc.

[0006] The technical means employed in this invention are as follows:

[0007] A measuring device for the sealing surface of a triple eccentric butterfly valve disc includes an eccentric die, a valve disc die, a valve disc component to be inspected, a valve disc measuring ruler, and a measuring body; the valve disc die is mounted on the upper surface of the eccentric die, and the valve disc component to be inspected is mounted on the upper surface of the valve disc die;

[0008] The measuring body includes a valve stem hole positioning shaft, a sliding column, and a measuring cantilever, with the valve stem hole positioning shaft and the sliding column located at both ends of the measuring cantilever, respectively.

[0009] The valve disc to be inspected is provided with a valve stem hole, and a guide hole is provided on the valve disc base at a position corresponding to the valve stem hole. The valve stem hole positioning shaft passes through and is rotatably installed in the guide hole and the valve stem hole in sequence. The valve stem hole positioning shaft is coaxially installed with the valve stem hole and the guide hole. The lower end face of the measuring cantilever is on the same plane as the lower end face of the sliding column. One end of the valve disc measuring ruler is slidably installed on the sliding column, and the other end can contact the valve disc sealing surface of the valve disc to be inspected.

[0010] Furthermore, the inclined jig is a slant-shaped tooling with an inclined upper surface. The inclined surface is provided with a leveling column, and the lower end face of the sliding column can contact the leveling column. A valve disc jig positioning hole is provided at the center of the inclined surface, and a valve disc jig positioning post is provided at the bottom of the valve disc jig. The valve disc jig positioning post is provided with a fixing pin hole. The valve disc jig is installed in the valve disc jig positioning hole through the valve disc jig positioning post and fixed by the fixing pin cooperating with the fixing pin hole. The rotation axis of the valve disc jig positioning post and the rotation axis of the valve disc jig positioning hole are on the same axis.

[0011] Furthermore, the valve disc fixture is a hollow cylindrical tool; the lower end face of the valve disc to be inspected is on the same plane as the upper end face of the valve disc fixture, and the lower end face of the valve disc fixture is on the same plane as the upper end face of the inclined fixture; the inclination angle of the upper end face of the inclined fixture is equal to the half-apex angle θ of the cone corresponding to the valve disc to be inspected.

[0012] Furthermore, the valve disc tire has two guide holes on its sidewalls and two valve stem holes on its sidewalls, with each guide hole corresponding to one valve stem hole. The measuring body can be installed on either side of the valve disc tire through the guide holes and the corresponding valve stem holes.

[0013] Furthermore, the front end of the valve stem hole positioning shaft has a tapered structure, and the valve stem hole is a tapered hole that matches the tapered structure.

[0014] Furthermore, a groove is provided on the upper surface of the sliding column, the valve disc measuring ruler is slidably installed in the groove, the valve disc measuring ruler is coaxially installed with the groove, and the axis of the valve stem hole positioning shaft is perpendicular to the axis of the groove;

[0015] The valve disc measuring ruler is marked with scale values; when the lower end face of the inclined tire is in a horizontal plane, and the lower end face of the measuring cantilever and the lower end face of the sliding groove column are in the same plane parallel to the horizontal plane: the valve disc measuring ruler can make tangential contact with the valve disc sealing surface, the axis of the valve disc measuring ruler is perpendicular to the generatrix of the cone corresponding to the valve disc component to be inspected, and the measurement value of the valve disc measuring ruler is L1.

[0016] Furthermore, the valve disc measuring ruler includes a measuring contact and a ruler body arranged coaxially. The measuring contact is installed at one end of the ruler body, and the other end of the ruler body is slidably installed in the slide groove. The ruler body is marked with scale values.

[0017] This invention also provides a method for measuring the sealing surface of a triple eccentric butterfly valve disc, which employs the aforementioned measuring device and specifically includes the following steps:

[0018] S1: Place the inclined tire on a horizontal surface;

[0019] S2: Rotate the measuring cantilever so that the lower end face of the sliding groove column contacts the leveling column;

[0020] S3: Place the level on the measuring arm, adjust the height of the leveling column by rotating it, so that the lower end face of the measuring arm and the lower end face of the sliding column are in the same plane parallel to the horizontal plane, and then lock the leveling column.

[0021] S4: After leveling, slide and adjust the valve disc measuring scale along the slide groove so that the valve disc measuring scale is in tangential contact with the valve disc sealing surface, and the axis of the valve disc measuring scale is perpendicular to the generatrix of the cone corresponding to the valve disc component to be inspected.

[0022] S5: Read the measured value L1 of the valve disc measuring scale along the axial direction of the valve disc measuring scale, that is, the end face of the sliding column facing the valve disc component to be inspected corresponds to the scale value on the valve disc measuring scale.

[0023] S6: Measure the S value and calculate the characteristic dimension L of the valve disc sealing surface according to the following formula:

[0024] L=S-L1cosθ

[0025] Wherein, S is the distance between the axis of the cone corresponding to the valve disc under test and the end face of the sliding column facing the valve disc under test, and θ is the half-apex angle of the cone corresponding to the valve disc under test.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] The device and method for measuring the sealing surface of a triple eccentric butterfly valve disc provided by this invention employs a slanted wheel, a valve disc wheel, a valve stem hole positioning shaft, and a measuring body. The characteristic dimensions are measured by tangenting the measuring contact to the sealing surface of the valve disc to be inspected. The measuring device and method are not limited by the angle of the sealing surface of a valve disc of a specific specification, thus improving versatility. Furthermore, the measurement and processing of the measurement data involved in the method are simple, thus improving measurement efficiency.

[0028] Based on the above reasons, this invention can be widely applied in the field of valve disc measurement. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of the valve disc sealing surface measuring device for the triple eccentric butterfly valve described in this invention;

[0031] Figure 2 This is a schematic diagram of the main measuring structure described in this invention;

[0032] Figure 3 This is a schematic diagram of the valve disc measuring ruler structure described in this invention;

[0033] Figure 4 This is a schematic diagram of the bias tire structure described in this invention;

[0034] Figure 5 This is a schematic diagram of the valve disc tire structure described in this invention;

[0035] Figure 6 This is a schematic diagram of the valve disc tire structure described in this invention;

[0036] Figure 7 This is a schematic diagram illustrating the principle of the method for measuring the sealing surface of the triple eccentric butterfly valve disc according to the present invention.

[0037] In the diagram: 1. Inclined tire; 2. Valve disc tire; 3. Valve disc to be inspected; 4. Valve disc measuring scale; 5. Measuring body; 6. Valve disc sealing surface; 7. Valve stem hole positioning shaft; 8. Sliding groove column; 9. Measuring cantilever; 10. Measuring contact; 11. Scale body; 12. Valve disc tire positioning hole; 13. Leveling column; 14. Valve disc tire positioning column; 15. Guide hole; 16. Fixing pin hole. Detailed Implementation

[0038] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0039] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0041] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0042] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0043] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0044] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0045] Example 1

[0046] like Figure 1-6 As shown, the present invention provides a measuring device for the sealing surface of a triple eccentric butterfly valve disc, including an inclined plate 1, a valve disc plate 2, a valve disc component to be inspected 3, a valve disc measuring ruler 4, and a measuring body 5; the valve disc plate 2 is mounted on the upper surface of the inclined plate 1, and the valve disc component to be inspected 3 is mounted on the upper surface of the valve disc plate 2.

[0047] The measuring body 5 includes a valve stem hole positioning shaft 7, a sliding groove column 8, and a measuring cantilever 9, with the valve stem hole positioning shaft 7 and the sliding groove column 8 located at both ends of the measuring cantilever 9, respectively.

[0048] The valve disc component 3 to be inspected is provided with a valve stem hole. The valve disc base 2 is provided with a guide hole 15 at a position corresponding to the valve stem hole. The valve stem hole positioning shaft 7 passes through and is rotatably installed in the guide hole 15 and the valve stem hole in sequence. The valve stem hole positioning shaft 7 is coaxially installed with the valve stem hole and the guide hole 15. The lower end face of the measuring cantilever 9 is on the same plane as the lower end face of the sliding column 8. One end of the valve disc measuring ruler 4 is slidably installed on the sliding column 8, and the other end can contact the valve disc sealing surface 6 of the valve disc component 3 to be inspected.

[0049] Furthermore, the inclined jig 1 is a slant-shaped tooling with an inclined surface on its upper end. The inclined surface is provided with a leveling column 13, and the lower end of the sliding column 8 can contact the leveling column 13. A valve disc jig positioning hole 12 is provided at the center of the inclined surface. A valve disc jig positioning column 14 is provided at the bottom of the valve disc jig 2. The valve disc jig positioning column 14 is provided with a fixing pin hole 16. The valve disc jig 2 is installed in the valve disc jig positioning hole 12 through the valve disc jig positioning column 14 and is fixed by the fixing pin cooperating with the fixing pin hole 16. The rotation axis of the valve disc jig positioning column 14 is on the same axis as the rotation axis of the valve disc jig positioning hole 12.

[0050] Furthermore, the valve disc fixture 2 is a hollow cylindrical tooling; the lower end face of the valve disc component 3 to be inspected is on the same plane as the upper end face of the valve disc fixture 2, and the lower end face of the valve disc fixture 2 is on the same plane as the upper end face of the inclined fixture 1; the inclination angle of the upper end face of the inclined fixture 1 is equal to the half-apex angle θ of the cone corresponding to the valve disc component 3 to be inspected.

[0051] Furthermore, the valve disc 2 has two guide holes 15 oppositely arranged on its sidewall, and the valve disc 3 to be inspected has two valve stem holes oppositely arranged on its sidewall. Each guide hole 15 corresponds to one valve stem hole, and the measuring body 5 can be installed on either side of the valve disc 2 through the guide holes 15 and the corresponding valve stem holes.

[0052] Furthermore, the front end of the valve stem hole positioning shaft 7 is a tapered structure, and the valve stem hole is a tapered hole that matches the tapered structure. By installing the valve stem hole positioning shaft 7 through the mutual cooperation between the tapered structure and the tapered hole, the positioning accuracy and fitting accuracy can be improved.

[0053] Furthermore, a groove is provided on the upper surface of the sliding column 8, the valve disc measuring ruler 4 is slidably installed in the groove, the valve disc measuring ruler 4 is coaxially installed with the groove, the axis of the valve stem hole positioning shaft 7 is perpendicular to the axis of the groove, but the two straight lines are not in the same plane and are skew lines; the angle between the axis of the groove and the plane where the lower end face of the sliding column 8 is located is equal to the half-apex angle θ of the cone corresponding to the valve disc part 3 to be inspected;

[0054] The valve disc measuring ruler 4 is marked with scale values; when the lower end face of the inclined tire 1 is in a horizontal plane, and the lower end face of the measuring cantilever 9 and the lower end face of the sliding groove column 8 are in the same plane parallel to the horizontal plane: the valve disc measuring ruler 4 can be in tangential contact with the valve disc sealing surface 6, the axis of the valve disc measuring ruler 4 is perpendicular to the generatrix of the cone corresponding to the valve disc component 3 to be inspected, and the measurement value of the valve disc measuring ruler 4 is L1.

[0055] Furthermore, the valve disc measuring ruler 4 includes a measuring contact 10 and a ruler body 11 arranged coaxially. The measuring contact 10 is installed at one end of the ruler body 11, and the other end of the ruler body 11 is slidably installed in the slide groove. The ruler body 11 is marked with scale values.

[0056] Furthermore, the leveling column 13 is bolted to the inclined surface. When measuring the valve disc sealing surface, the inclined tire 1 is placed on a horizontal surface, and the height of the leveling column 13 is adjusted by rotating the bolt, thereby adjusting the lower end face of the measuring cantilever 9 and the lower end face of the sliding column 8 to be horizontal, and then subsequent measurements are performed.

[0057] Furthermore, the upper end face of the valve disc 2 and the edge of the valve disc component 3 to be inspected are respectively provided with mutually matching stepped structures, and the valve disc component 3 to be inspected and the valve disc 2 are connected through the stepped structures.

[0058] Furthermore, the measuring contact 10 is wedge-shaped.

[0059] like Figure 7 As shown, the present invention also provides a method for measuring the sealing surface of a triple eccentric butterfly valve disc, using the aforementioned measuring device, specifically including the following steps:

[0060] S1: Place the inclined tire 1 on a horizontal surface;

[0061] S2: Rotate the measuring cantilever 9 so that the lower end face of the sliding groove column 8 contacts the leveling column 13;

[0062] S3: Place the level on the measuring arm 9, adjust the height of the leveling column 13 by rotation, so that the lower end face of the measuring arm 9 and the lower end face of the sliding column 8 are in the same plane parallel to the horizontal plane, and then lock the leveling column 13.

[0063] S4: After leveling, slide and adjust the valve disc measuring scale 4 along the slide groove so that the valve disc measuring scale 4 is in tangential contact with the valve disc sealing surface 6, and the axis of the valve disc measuring scale 4 is perpendicular to the generatrix of the cone corresponding to the valve disc component 3 to be inspected.

[0064] S5: Read the measured value L1 of the valve disc measuring scale 4 along the axial direction of the valve disc measuring scale 4, that is, the scale value on the valve disc measuring scale 4 corresponding to the end face of the sliding column 8 facing the valve disc 3 to be inspected.

[0065] S6: Measure the S value and calculate the characteristic dimension L of the valve disc sealing surface 6 according to the following formula, which represents the dimension of the valve disc sealing surface corresponding to the valve disc component 3 under inspection:

[0066] L=S-L1cosθ

[0067] Wherein, S is the distance between the axis of the cone corresponding to the valve disc 3 under test and the end face of the sliding column 8 facing the valve disc 3 under test, and θ is the half apex angle of the cone corresponding to the valve disc 3 under test.

[0068] When processing the valve disc sealing surface 6 of the valve disc component 3 to be inspected, the value of the feature dimension L can be calculated based on the real-time measurement value L1, and the processing process can be monitored in real time. As the processing progresses, when the value of the feature dimension L meets the requirements, it indicates that the processing is completed.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for measuring a sealing surface of a disc of a triple offset butterfly valve, characterized in that, It includes a bias tire (1), a valve disc tire (2), a valve disc component to be inspected (3), a valve disc measuring ruler (4), and a measuring body (5); the valve disc tire (2) is installed on the upper surface of the bias tire (1), and the valve disc component to be inspected (3) is installed on the upper surface of the valve disc tire (2); The measuring body (5) includes a valve stem hole positioning shaft (7), a sliding column (8), and a measuring cantilever (9), with the valve stem hole positioning shaft (7) and the sliding column (8) located at both ends of the measuring cantilever (9); The valve disc component (3) to be inspected is provided with a valve stem hole. The valve disc base (2) is provided with a guide hole (15) at a position corresponding to the valve stem hole. The valve stem hole positioning shaft (7) passes through and is rotatably installed in the guide hole (15) and the valve stem hole in sequence. The valve stem hole positioning shaft (7) is coaxially installed with the valve stem hole and the guide hole (15). The lower end face of the measuring cantilever (9) is on the same plane as the lower end face of the sliding column (8). One end of the valve disc measuring ruler (4) is slidably installed on the sliding column (8), and the other end can contact the valve disc sealing surface (6) of the valve disc component (3) to be inspected. The inclined jig (1) is a slant-shaped tool. The upper end face of the inclined jig (1) is an inclined surface. The inclined surface is provided with a leveling column (13). The lower end face of the sliding column (8) can contact the leveling column (13). The center of the inclined surface is provided with a valve disc jig positioning hole (12). The bottom of the valve disc jig (2) is provided with a valve disc jig positioning column (14). The valve disc jig positioning column (14) is provided with a fixing pin hole (16). The valve disc jig (2) is installed in the valve disc jig positioning hole (12) through the valve disc jig positioning column (14) and fixed by the fixing pin cooperating with the fixing pin hole (16). The rotation axis of the valve disc jig positioning column (14) and the rotation axis of the valve disc jig positioning hole (12) are on the same axis. The valve disc fixture (2) is a hollow cylindrical tooling; the lower end face of the valve disc component (3) to be inspected is on the same plane as the upper end face of the valve disc fixture (2), and the lower end face of the valve disc fixture (2) is on the same plane as the upper end face of the inclined fixture (1); the inclination angle of the upper end face of the inclined fixture (1) is equal to the half-apex angle θ of the cone corresponding to the valve disc component (3) to be inspected. The upper surface of the slide column (8) is provided with a slide groove, the valve disc measuring ruler (4) is slidably installed in the slide groove, the valve disc measuring ruler (4) is coaxially installed with the slide groove, and the axis of the valve stem hole positioning shaft (7) is perpendicular to the axis of the slide groove. The valve disc measuring ruler (4) is marked with scale values; when the lower end face of the inclined tire (1), the lower end face of the measuring cantilever (9) and the lower end face of the sliding column (8) are all on the horizontal plane: the valve disc measuring ruler (4) can be in tangential contact with the valve disc sealing surface (6), the axis of the valve disc measuring ruler (4) is perpendicular to the generatrix of the cone corresponding to the valve disc component (3) to be inspected, and the measurement value of the valve disc measuring ruler (4) is L1.

2. The triple offset butterfly valve disc sealing face measuring device of claim 1, wherein, The valve disc (2) has two guide holes (15) on its side wall and the valve disc (3) to be inspected has two valve stem holes on its side wall. Each guide hole (15) corresponds to one valve stem hole. The measuring body (5) can be installed on either side of the valve disc (2) through the guide hole (15) and the corresponding valve stem hole.

3. The triple offset butterfly valve disc sealing surface measuring device of claim 1, wherein, The front end of the valve stem hole positioning shaft (7) is a tapered structure, and the valve stem hole is a tapered hole that matches the tapered structure.

4. The triple offset butterfly valve disc sealing surface measuring device of claim 1, wherein, The valve disc measuring ruler (4) includes a measuring contact (10) and a ruler body (11) arranged coaxially. The measuring contact (10) is installed at one end of the ruler body (11), and the other end of the ruler body (11) is slidably installed in the slide groove. The ruler body (11) is marked with scale values.

5. A method of measuring a sealing surface of a triple offset butterfly valve disc, characterized in that, The measuring device as described in claim 1 specifically includes the following steps: S1: Place the bias tire (1) on a horizontal surface; S2: Rotate the measuring cantilever (9) so that the lower end face of the sliding column (8) comes into contact with the leveling column (13); S3: Place the level on the measuring arm (9), adjust the height of the leveling column (13) by rotating it, so that the lower end face of the measuring arm (9) and the lower end face of the sliding column (8) are both on the horizontal plane, and then lock the leveling column (13). S4: After leveling, slide and adjust the valve disc measuring scale (4) along the groove so that the valve disc measuring scale (4) is in tangential contact with the valve disc sealing surface (6), and the axis of the valve disc measuring scale (4) is perpendicular to the generatrix of the cone corresponding to the valve disc component (3) to be inspected; S5: Read the measured value L1 of the valve disc measuring scale (4) along the axial direction of the valve disc measuring scale (4), that is, the end face of the sliding column (8) facing the valve disc part (3) to be inspected corresponds to the scale value on the valve disc measuring scale (4); S6: Measure the S value and calculate the characteristic dimension L of the valve disc sealing surface (6) according to the following formula: L = S - L1cosθ Wherein, S is the distance between the axis of the cone corresponding to the valve disc (3) under test and the end face of the sliding column (8) facing the valve disc (3) under test, and θ is the half apex angle of the cone corresponding to the valve disc (3) under test.

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