Method for adjusting the sealing angle of a sealing valve

Abstract

This invention provides a method for adjusting the sealing angle of a sealing valve, comprising the following steps: Step 1, measuring the original sealing surface angle α0 of the valve disc of the sealing valve to be tested; Step 2, adjusting the sealing angle according to the data measured in Step 1 and the preset valve actuator thrust F of the sealing valve. ' Calculate the sealing specific pressure q corresponding to the original sealing surface angle α0. p Step 3: Determine the valve sealing specific pressure q0[q] that meets the sealing requirements. min ,q max Step 4: Determine the sealing specific pressure q corresponding to the original sealing surface angle α0. p Is it in q0[q min ,q max Within the range of ], if so, the original sealing surface angle α0 is modified to adjust the sealing angle α. x Step 5: Calculate the sealing angle of the sealing valve as the modified adjusted sealing angle α. x The actual sealing pressure q at that time x This invention achieves the adjustment of the sealing specific pressure to meet the mechanical properties of the valve disc material by adjusting the sealing angle without adjusting the thrust of the actuator.

Description

Technical Field

[0001] This invention relates to the field of sealing valve technology, and in particular to a method for adjusting the sealing angle of a sealing valve. Background Technology

[0002] Valves are extremely common components of piping systems, and their performance directly affects the piping system. Valves consist of a valve disc and a valve seat, and both the valve disc and valve seat can use conical surface seals.

[0003] During valve use, improper fit between the valve disc and valve seat sealing surfaces can lead to internal leakage due to insufficient sealing pressure. Conversely, excessive sealing pressure can cause indentations. Currently, there is no way to adjust the valve's sealing pressure by adjusting the sealing angle. Summary of the Invention

[0004] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a method for adjusting the sealing angle of a sealing valve, which solves the problems of internal leakage of the sealing surface caused by insufficient valve sealing pressure and damage to the sealing surface caused by excessive valve sealing pressure in the prior art.

[0005] To achieve the above and other related objectives, the present invention provides a method for adjusting the sealing angle of a sealing valve, characterized by comprising the following steps:

[0006] Step 1: Measure the original sealing surface angle of the valve disc of the valve to be tested. ;

[0007] Step 2: Based on the data measured in Step 1 and the preset valve actuator thrust of the sealing valve... Calculate the angle of the original sealing surface. Corresponding sealing pressure ;

[0008] Step 3: Determine the valve sealing pressure that meets the sealing requirements. [ , ];

[0009] Step 4: Determine the angle of the original sealing surface. The corresponding sealing pressure Is it in [ , Within the range of ], if [ , Then the angle of the original sealing surface will be... Modified to adjust sealing angle ;

[0010] Step 5: Calculate the sealing angle of the sealing valve as the modified adjusted sealing angle. Actual sealing pressure at that time Determine the modified adjusted sealing angle The corresponding actual sealing pressure Does it meet the requirements? ∈ [ , If the condition is not met, repeat steps one through five. If the condition is met, the adjustment of the sealing angle of the sealing valve is completed.

[0011] In one embodiment of the present invention, the calculation formulas used in steps two and five are as follows: ;in, The mid-diameter of the sealing surface, The width of the sealing surface. For the sealing surface angle, The friction angle of the sealing surface. The thrust of the valve actuator in step two.

[0012] In one embodiment of the present invention, the sealing surface angle ∈[30°, 60°].

[0013] In one embodiment of the present invention, in step four, when > If the actual sealing pressure is too high relative to the sealing pressure under the condition that the sealing valve meets the sealing requirements, then the sealing pressure is determined to be too high.

[0014] In one embodiment of the present invention, in step four, when < If the actual sealing pressure is insufficient relative to the sealing pressure under the condition that the sealing valve meets the sealing requirements, then the sealing pressure is determined to be insufficient.

[0015] In one embodiment of the present invention, when the actual sealing pressure is too large relative to the sealing pressure under the condition that the sealing valve meets the sealing requirements, the angle of the original sealing surface is adjusted. Increase △ Adjust the sealing angle as described .

[0016] In one embodiment of the present invention, when the actual sealing pressure is insufficient relative to the sealing pressure under the condition that the sealing valve meets the sealing requirements, the angle of the original sealing surface is adjusted. Decrease △ Adjust the sealing angle as described .

[0017] In one embodiment of the present invention, the sealing performance of the sealing valve meets the sealing requirements by gradually applying pressure to the sealing surface to achieve the minimum sealing specific pressure at which the sealing valve completes the sealing. and the maximum sealing specific pressure that enables the sealing valve to achieve a seal at its mechanical limit. Requirements.

[0018] In one embodiment of the present invention, step five utilizes the modified adjusted sealing angle. Calculate the actual sealing pressure At that time, the thrust of the valve actuator It remains unchanged.

[0019] In one embodiment of the present invention, in step one, the lateral movement distance along the side of the valve disc sealing surface of the sealing valve is measured using a sealing angle measuring tool. And measure the vertical movement distance at the sealing angle. The angle of the original sealing surface is obtained. =arctan( / ).

[0020] As described above, the sealing angle adjustment method for a sealing valve according to the present invention has the following beneficial effects:

[0021] By pre-measuring the original sealing angle of the sealing surface and the thrust of the valve actuator, the sealing pressure of the original sealing angle is calculated. When the sealing pressure is greater than the maximum sealing pressure required for the valve to meet sealing requirements, it is confirmed whether there are indentations on the original sealing surface. The sealing pressure is then adjusted by increasing the sealing angle to decrease the sealing pressure. Conversely, when the sealing pressure is less than the minimum sealing pressure required for the valve to meet sealing requirements, it is confirmed that there is internal leakage on the sealing surface. The sealing pressure is then adjusted by decreasing the sealing angle to increase the sealing pressure. Through these methods, the valve disc sealing pressure can be adjusted without changing the thrust of the valve actuator, ensuring the valve disc operates under reasonable mechanical performance conditions. Attached Figure Description

[0022] Figure 1 This is a flowchart illustrating the adjustment method of the present invention.

[0023] Figure 2 This is a schematic diagram of the sealing angle measuring tool and the sealing valve to be adjusted in this invention.

[0024] Figure 3 This is a sectional view of the sliding rod and base of the sealing angle measuring tool in this invention during installation;

[0025] Figure 4This is a schematic diagram of the slide block of the sealing angle measuring tool in this invention from a top-down perspective;

[0026] Figure 5 The sealing angle of the sealing surface of the sealing valve of the present invention. Schematic diagram;

[0027] Figure 6 This is a coordinate graph of the measurement data from the sealing angle measuring tool of the present invention. Detailed Implementation

[0028] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, unless otherwise specified, the following embodiments and features can be combined with each other. It should also be understood that the terminology used in the embodiments of the present invention is for describing specific implementation schemes and not for limiting the scope of protection of the present invention. Test methods in the following embodiments that do not specify specific conditions are generally performed under conventional conditions or according to the conditions recommended by the respective manufacturers.

[0029] Please see Figures 1 to 6 It should be understood that the structures, proportions, sizes, etc., illustrated in the accompanying drawings are merely for illustrative purposes to aid those skilled in the art and to facilitate understanding. They are not intended to limit the scope of the invention and therefore have no substantial technical significance. Any modifications to the structure, changes in proportions, or adjustments to size, without affecting the effectiveness or purpose of the invention, should still fall within the scope of the technical content disclosed herein. Furthermore, the terms "upper," "lower," "left," "right," "middle," and "one" used in this specification are merely for clarity and not intended to limit the scope of the invention. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of the invention.

[0030] Please see Figure 1 This invention provides a method for adjusting the sealing angle of a sealing valve, comprising the following steps:

[0031] Step 1: Measure the original sealing surface angle of the valve disc of the valve to be tested. ;

[0032] Step 2: Based on the data measured in Step 1 and the preset valve actuator thrust of the sealing valve... Calculate the original sealing surface angle Corresponding sealing pressure ;

[0033] Step 3: Determine the sealing performance of the sealing valve and the valve sealing specific pressure that meets the sealing requirements. [ , ];

[0034] Step 4: Determine the angle of the original sealing surface Corresponding sealing pressure Is it in [ , Within the range of ], if [ , ], then the original sealing surface angle Modified to adjust sealing angle ;

[0035] Step 5: Calculate the sealing angle of the sealing valve to obtain the modified adjustment sealing angle. Actual sealing pressure at that time Determine the adjusted sealing angle after modification. Corresponding actual sealing pressure Does it meet the requirements? ∈ [ , If it does not meet the requirements, repeat steps one through five. If it does meet the requirements, then stop adjusting the sealing angle of the sealing valve.

[0036] In this embodiment, the angle of the original sealing surface of the valve disc is first adjusted. Measurements are taken, and the actuator thrust is determined based on a preset (usually provided by the valve manufacturer) value when a seal is achieved between the valve disc and valve seat. Furthermore, based on the original sealing surface angle of the valve disc , Execution agency thrust The calculation formula between them yields the original sealing surface angle. Corresponding sealing pressure .

[0037] Then, based on the maximum sealing pressure of the valve disc to meet the on-site sealing requirements... and minimum sealing pressure ,Right now [ , ]. Further judgment on the above Is it in [ , Within this range, the method for improving the sealing angle was determined. This allows... After being modified to hour, able to fall into [ , Within the range of ], to complete the sealing angle The modifications and adjustments can improve the internal leakage or indentation on the valve disc surface, and also solve the problem of excessive sealing force on the valve disc caused by directly adjusting the axial force of the valve stem, which exceeds the mechanical performance limit of the valve disc material and causes overall damage to the valve disc.

[0038] The calculation formula is: ;in, The mid-diameter of the sealing surface, The width of the sealing surface. For the sealing surface angle, The friction angle of the sealing surface. This refers to the thrust of the valve actuator. The above formula is from "Valve Magazine", Issue 1, 2010, No. 1002-5855, page 9.

[0039] sealing surface angle ∈[30°, 60°], for example, when adjusting the sealing angle, if the sealing force is insufficient and the sealing angle needs to be increased, the original sealing angle is adjusted by... Reduce from 60° to adjust the sealing angle. During the process of 30°, the maximum angle modification range was calculated according to the calculation formula. =60° and The sealing pressure at 30° was increased by 1.15 times, thus achieving the goal of improving the sealing condition by adjusting the angle of the sealing surface.

[0040] In step three, the sealing performance of the sealing valve meets the sealing requirements by gradually applying pressure to the sealing surface to achieve the minimum sealing specific pressure at which the sealing valve completes the seal. And the maximum sealing specific pressure that enables the sealing valve to achieve a seal, which is the mechanical limit. Requirements. Minimum sealing specific pressure. and maximum sealing pressure It can be provided by the manufacturer, or it can be determined on-site by conducting a test that gradually applies pressure to the sealing surface based on the actual usage conditions at the time.

[0041] In step four, when > If the actual sealing pressure is too high relative to the sealing valve's sealing performance, indicating that the sealing surface has indentations, it means that the sealing surface has indentations. When the actual sealing pressure is too high relative to the sealing valve's sealing performance, the original sealing surface angle should be adjusted. Increase △ Adjust the sealing angle .

[0042] In step four, when < If the actual sealing pressure is insufficient relative to the sealing valve's sealing performance under the condition that the sealing requirements are met, it indicates internal leakage at the sealing surface. When the actual sealing pressure is insufficient relative to the sealing valve's sealing performance under the condition that the sealing requirements are met, the original sealing surface angle should be adjusted. Decrease △ Adjust the sealing angle .

[0043] In step five, the modified sealing angle is used. Calculate the actual sealing pressure At that time, the valve actuator thrust The thrust of the valve actuator remains constant. No change, only the angle of the original sealing surface is changed. Adjusting the sealing angle Adjusting the valve's sealing pressure allows for adjustment of the valve's sealing pressure ratio. The valve's sealing pressure ratio refers to the sealing pressure ratio between the valve disc and the valve seat of a sealing valve.

[0044] In step one, the lateral movement distance along the sealing surface of the valve disc is measured using a sealing angle measuring tool. And measure the vertical movement distance at the sealing angle. The original sealing surface angle is obtained. =arctan( / ).

[0045] like Figure 3 As shown, in order to achieve the original sealing surface angle of the valve disc of the valve under test... To achieve precise measurement, this invention also provides a sealing angle measuring tool. The sealing valve includes a valve disc 902 and comprises: a sliding rod 2, an adjusting assembly 3, a first measuring device 4, a second measuring device 5, and a control device. The adjusting assembly 3 is slidably mounted on the sliding rod 2. The first measuring device 4 is mounted on one side of the adjusting assembly 3 and measures the distance from the side of the valve disc 902 in the lateral direction. The second measuring device 5 is mounted on the other side of the adjusting assembly 3 and measures the distance the first measuring device 4 moves in the longitudinal direction along the sliding rod 2. The control device is electrically connected to both the first measuring device 4 and the second measuring device 5. When the measurement data of the first measuring device 4 changes linearly, the control device controls the second measuring device 5 to enter the state of measuring the sealing angle of the valve disc 902.

[0046] In this embodiment, during the measurement of the sealing angle of the sealing valve, the sealing valve is kept parallel to the sliding rod 2. By adjusting the component 3 and moving it back and forth on the sliding rod 2, the first measuring device 4 will obtain measurement data that increases or decreases linearly. Based on the information that the measurement data of the first measuring device increases or decreases linearly, the control device sends a control signal to the second measuring device 5. The second measuring device 5 then enters the state of measuring the sealing angle, thereby realizing the measurement from the starting point to the ending point of the sealing angle of the sealing surface.

[0047] like Figure 2 As shown, the sealing valve also includes a valve stem 901, which is installed at the bottom center of the valve disc 902, and the top edge of the valve disc 902 is located on a conical sealing surface.

[0048] The control device can be a microcontroller or PLC, which is electrically connected to the first measuring device 4 and the second measuring device 5 respectively.

[0049] The measuring tool also includes a display 7, which is mounted on the first measuring device 4 and electrically connected to the first measuring device 4 and the second measuring device 5, respectively.

[0050] The first measuring device 4 is a laser emitting device.

[0051] The second measuring device 5 is a displacement sensor.

[0052] When the measurement data of the first measuring device 4 remains unchanged, the control device controls the second measuring device 5 to be in a state ready to measure the sealing angle.

[0053] When the measurement data of the first measuring device 4 experiences a step change, the control device controls the second measuring device 5 to stop measuring the sealing angle.

[0054] In this embodiment, when the first detection device 4 moves to the top of the sealing angle, that is, the upper surface of the valve disc 902, the measurement data of the first detection device 4 suddenly increases to infinity, and this process is called a "step".

[0055] like Figure 3 As shown, the lower end of the sliding rod 2 is vertically provided with a base 1, the lower end of the sliding rod 2 is a spherical structure, and the upper surface of the base 1 is provided with an active space 11 corresponding to the spherical structure.

[0056] In this embodiment, the sliding rod 2 is adjusted on the base 1 to make the sliding rod 2 and the base 1 mutually vertical. When the sliding rod 2 is adjusted on the base 1, the sliding rod 2 can be rotated directly on the base 1 to make the sliding rod 2 mutually perpendicular to the base 1. Then, the first measuring device 4 and the second measuring device 5 are used to accurately measure the sealing angle of the valve disc 902.

[0057] A right-angle template 8 is fixed at the angle between the sliding rod 2 and the base 1, so that the sliding rod 2 and the base 1 are arranged perpendicular to each other.

[0058] In this embodiment, the right-angle template 8 can be used to support the sliding rod 2 after it is adjusted on the base 1, thereby ensuring that the sliding rod 2 can be stably kept vertical on the base 1.

[0059] like Figure 4 As shown, the adjustment assembly 3 includes: a slide 31, the middle of which has a sliding cavity for the slide 31 to move on the sliding rod 2; and a locking assembly 32, which is located on one side of the slide 31 and locks the slide 31 onto the moving rod 2.

[0060] In this embodiment, when the adjusting component 3 moves up and down on the sliding rod 2, the locking component 32 is released from locking the sliding rod 2, so that the slide block 31 can move up and down on the sliding rod 2, thereby using the first measuring device 4 and the second measuring device 5 to measure the sealing angle of the valve disc 902.

[0061] The locking assembly 32 includes a set screw 321 that is threaded through the sidewall of the slide 31 and extends into the sliding cavity.

[0062] In this embodiment, when locking the slide block 31 onto the sliding rod 2, the locking assembly 32 rotates the set screw 321, causing the end of the set screw 321 to move toward the sliding cavity side, thereby locking the slide block 31 onto the sliding rod 2.

[0063] like Figure 5 As shown, when calculating the sealing angle on the valve disc, the first measuring device 4 obtains the change value L1 when the distance between it and the side of the valve disc changes linearly. The second measuring device 5 measures the displacement height L2 of the first measuring device 4 along the sliding rod 2 when the data measured by the first measuring device 4 changes linearly. Thus, the formula tan... =L1 / L2, thus the valve disc sealing angle is: =arctanL1 / L2.

[0064] For example, a displacement sensor measures a vertical movement distance of 9mm, and a laser measurement shows a difference of 10mm from the starting position to the ending position of the cone. According to tan... =10 / 9, we get arctan(10 / 9)≈48°, and thus the sealing angle of the sealing surface is about 48°.

[0065] This invention can also use other suitable measuring tools to measure the original sealing surface angle of the valve disc of the sealing valve. .

[0066] This invention also provides a method for measuring the sealing angle of a sealing valve using a measuring tool, comprising:

[0067] Step 1: Place the valve disc vertically on one side of the sliding rod 2, so that the valve disc 902 is at the top and the valve rod 901 is at the bottom;

[0068] Step 2: Release the locking component 32 from the sliding rod 2, and manually move the slide block 31 from bottom to top;

[0069] Step 3: The first measuring device 4 probes the side of the valve disc 902 from bottom to top to obtain fixed measurement data.

[0070] Step 4: When the first measuring device 4 reaches the sealing angle, the measurement data of the first measuring device 4 increases linearly.

[0071] Step 5: Upon receiving the linearly increasing signal, the control device controls the second measuring device 5 to perform measurement and obtain the vertical distance of the sealing angle.

[0072] Step 6: Establish a coordinate system based on the measurement data from the first measuring device 4 and the second measuring device 5.

[0073] like Figure 6 As shown, line 1 represents the process of the first measuring device 4 probing the side of valve disc 902, line 2 represents the process of the first measuring device 4 probing the sealing surface of valve disc 902, and line 3 represents the process of the first measuring device 4 leaving the sealing surface of valve disc 902.

[0074] The angle between line 2 and the horizontal line is the sealing angle of the sealing surface. If line 2 is not a straight line, but a curved line, it means that the sealing surface is not conical, but has a certain curvature.

[0075] Example 1

[0076] Pneumatic control valve internal leakage exceeding standard when closed:

[0077] Step 1: Measure the original sealing surface angle of the valve disc of the valve to be tested. It is 60°;

[0078] Step 2: Based on the original sealing surface angle data measured in Step 1 and the preset valve actuator thrust... (Usually provided by the manufacturer) is 10883N, the friction angle μ of the sealing surface is 30°, the center diameter dm of the sealing surface is 60mm, the width Nr of the sealing surface is 1mm, and the original sealing surface angle is calculated using a formula. Sealing pressure at 60° Approximately 50 MPa;

[0079] Step 3: Determine the minimum sealing pressure of the valve that meets the sealing requirements under normal temperature and pressure conditions. It is 57.7 MPa;

[0080] Step 4: Judgment < If the actual sealing pressure is insufficient relative to the sealing pressure required by the sealing valve, it indicates internal leakage at the sealing surface. Therefore, the original sealing surface angle should be adjusted. =60° turning △ =30° to adjust the sealing angle =30°;

[0081] Step 5: Calculate the improved sealing angle using the formula to adjust the sealing angle. Actual sealing pressure at 30° =57.7MPa, reaching the minimum actual sealing specific pressure. Once the sealing pressure requirement is met, the sealing angle of the sealing valve can be adjusted.

[0082] Example 2

[0083] Pneumatic control valve internal leakage exceeding standard when closed:

[0084] Step 1: Measure the original sealing surface angle of the valve disc of the valve to be tested. It is 70°;

[0085] Step 2: Based on the original sealing surface angle data measured in Step 1 and the preset valve actuator thrust... (Usually provided by the manufacturer) 32152N, sealing surface friction angle μ is 30°, sealing surface center diameter dm is 100mm, sealing surface width Nr is 1.5mm, and the original sealing surface angle is calculated using a formula. Sealing pressure at 70° Approximately 60 MPa;

[0086] Step 3: Determine the minimum sealing pressure of the valve that meets the sealing requirements under normal temperature and pressure conditions. It is 69.7 MPa;

[0087] Step 4: Judgment < If the actual sealing pressure is insufficient relative to the sealing pressure required by the sealing valve, it indicates internal leakage at the sealing surface. Therefore, the original sealing surface angle should be adjusted. =70° turning △ =42° to adjust the sealing angle =28°;

[0088] Step 5: Calculate the improved sealing angle using the formula to adjust the sealing angle. Actual sealing pressure at 28° =69.7MPa, reaching the minimum actual sealing specific pressure. Once the sealing pressure requirement is met, the sealing angle of the sealing valve can be adjusted.

[0089] Example 3

[0090] Excessive closing force of the pneumatic control valve caused indentation damage to the sealing surface.

[0091] Step 1: Measure the original sealing surface angle of the valve disc of the valve to be tested. It is 30°;

[0092] Step 2: Based on the original sealing surface angle data measured in Step 1 and the preset valve actuator thrust... (Usually provided by the manufacturer) is 10883N, the friction angle μ of the sealing surface is 30°, the center diameter dm of the sealing surface is 60mm, the width Nr of the sealing surface is 1mm, and the original sealing surface angle is calculated using a formula. Sealing pressure at 30° Approximately 57.7 MPa;

[0093] Step 3: Determine the maximum sealing pressure of the valve that meets the sealing requirements under normal temperature and pressure conditions. It is 50.0 MPa;

[0094] Step 4: Judgment > If the actual sealing pressure is too high relative to the sealing valve's sealing performance under the condition that the sealing requirements are met, it indicates that there is indentation damage on the sealing surface.

[0095] Original sealing surface angle =30° turning △ =30° to adjust the sealing angle =60°;

[0096] Step 5: Calculate the improved sealing angle using the formula to adjust the sealing angle. Actual sealing pressure at 60° =50.0MPa, reaching the maximum actual sealing specific pressure. Once the sealing pressure requirement is met, the sealing angle of the sealing valve can be adjusted.

[0097] Example 4

[0098] Excessive closing force of the pneumatic control valve caused indentation damage to the sealing surface.

[0099] Step 1: Measure the original sealing surface angle of the valve disc of the valve to be tested. It is 28°;

[0100] Step 2: Based on the original sealing surface angle data measured in Step 1 and the preset valve actuator thrust... (Usually provided by the manufacturer) 32152N, sealing surface friction angle μ is 30°, sealing surface center diameter dm is 100mm, sealing surface width Nr is 1.5mm, and the original sealing surface angle is calculated using a formula. Sealing pressure at 28° Approximately 69.7 MPa;

[0101] Step 3: Determine the maximum sealing pressure of the valve that meets the sealing requirements under normal temperature and pressure conditions. It is 60.0 MPa;

[0102] Step 4: Judgment > If the actual sealing pressure is too high relative to the sealing valve's sealing performance under the condition that the sealing requirements are met, it indicates that there is indentation damage on the sealing surface. In this case, the original sealing surface angle should be adjusted. =28° turning △ =42° to adjust the sealing angle =70°;

[0103] Step 5: Calculate the improved sealing angle using the formula to adjust the sealing angle. Actual sealing pressure at 70° =60.0MPa, reaching the maximum actual sealing specific pressure. Once the sealing pressure requirement is met, the sealing angle of the sealing valve can be adjusted.

[0104] In summary, this invention first measures the actuator thrust when the valve stem completely seals the valve disc against the valve seat. The angle between the valve disc and the original sealing surface of the valve under test Thus, the original sealing pressure can be obtained according to the calculation formula. and in Greater than [ , When the pressure is [high], it indicates that the original sealing pressure is too high. Adjusting the angle of the original sealing surface can help. To adjust and reduce Gradually tending to [ , Within the specified range to ensure sealing pressure. Maintaining within the range of mechanical properties that the valve disc can withstand; similarly, in Less than [ , When the pressure is insufficient, it indicates that the original sealing pressure is inadequate. This can be addressed by adjusting and reducing the angle of the original sealing surface. To adjust and increase Gradually tending to [ , Within this range, it is possible to achieve direct adjustment of the sealing pressure, but directly by adjusting the angle of the original sealing surface. This invention enables adjustment of the sealing pressure ratio and ensures the service life of the valve disc under suitable sealing pressure. Therefore, this invention effectively overcomes the various shortcomings of the prior art and has high industrial application value.

[0105] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in the present invention should still be covered by the claims of the present invention.

Claims

1. A method for adjusting the sealing angle of a sealing valve, characterized in that, Includes the following steps: Step 1: Measure the original sealing surface angle of the valve disc of the valve to be tested. ; Step 2: Based on the data measured in Step 1 and the preset valve actuator thrust of the sealing valve... Calculate the angle of the original sealing surface. Corresponding sealing pressure ; Step 3: Determine the valve sealing pressure that meets the sealing requirements. [ , ]; Step 4: Determine the angle of the original sealing surface. The corresponding sealing pressure Is it in [ , Within the range of ], if [ , Then the angle of the original sealing surface will be... Modified to adjust sealing angle ; Step 5: Calculate the sealing angle of the sealing valve as the modified adjusted sealing angle. Actual sealing pressure at that time Determine the modified adjusted sealing angle The corresponding actual sealing pressure Does it meet the requirements? ∈ [ , If it does not meet the requirements, repeat steps one through five; if it does meet the requirements, the adjustment of the sealing angle of the sealing valve is finished. in, ;in, The mid-diameter of the sealing surface, The width of the sealing surface. For the sealing surface angle, The friction angle of the sealing surface.

2. The method for adjusting the sealing angle of the sealing valve according to claim 1, characterized in that: The angle of the sealing surface ∈[30°, 60°].

3. The method for adjusting the sealing angle of the sealing valve according to claim 1, characterized in that: In step four, when > If the actual sealing pressure is too high relative to the sealing pressure under the condition that the sealing valve meets the sealing requirements, then the sealing pressure is determined to be too high.

4. The method for adjusting the sealing angle of the sealing valve according to claim 1, characterized in that: In step four, when < If the actual sealing pressure is insufficient relative to the sealing pressure under the condition that the sealing valve meets the sealing requirements, then the sealing pressure is determined to be insufficient.

5. The method for adjusting the sealing angle of the sealing valve according to claim 3, characterized in that: When the actual sealing pressure is too high relative to the sealing pressure under the condition that the sealing valve meets the sealing requirements, the angle of the original sealing surface will be adjusted. Increase △ Adjust the sealing angle as described .

6. The method for adjusting the sealing angle of the sealing valve according to claim 4, characterized in that: When the actual sealing pressure is insufficient relative to the sealing pressure under the condition that the sealing valve meets the sealing requirements, the angle of the original sealing surface will be adjusted. Decrease △ Adjust the sealing angle as described .

7. The method for adjusting the sealing angle of the sealing valve according to claim 1, characterized in that: The sealing valve meets the sealing requirements by gradually applying pressure to the sealing surface, achieving the minimum sealing specific pressure at which the valve completes a seal. and the maximum sealing specific pressure that enables the sealing valve to achieve a seal at its mechanical limit. Requirements.

8. The method for adjusting the sealing angle of the sealing valve according to claim 1, characterized in that: In step five, the modified sealing angle is used. Calculate the actual sealing pressure At that time, the thrust of the valve actuator It remains unchanged.

9. The method for adjusting the sealing angle of the sealing valve according to claim 1, characterized in that: In step one, the lateral movement distance along the side of the valve disc sealing surface of the sealing valve is measured using a sealing angle measuring tool. And measure the vertical movement distance at the sealing angle. The angle of the original sealing surface is obtained. =arctan( / ).

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