Control method of high safety ball valve for oil pipeline

Abstract

The present application discloses a control method for a high-safety ball valve for oil pipelines, wherein a plurality of mounting holes are arranged on the outer circumference of the valve stem and below the boss ring, wherein an elastic pin assembly is arranged in the mounting hole, wherein the elastic pin assembly comprises an elastic member arranged at the inner end of the mounting hole and a pin arranged at the outer end of the mounting hole; in the control method for a high-safety ball valve for oil pipelines provided by the present invention, one end of the pin in the width direction is a chamfered structure and the other end is a straight structure, a plurality of pin holes corresponding to the plurality of elastic pin assemblies are arranged on the circumferential direction of the inner wall of the upper cylindrical groove of the sphere, and a torque sensor is arranged corresponding to the valve stem to monitor the torque of the valve stem; when the valve stem is rotated in the reverse direction, the pin will not form a combination with the pin hole, and the torque sensor data obtained in this process can evaluate the fixing effect of the valve stem and the installation effect of the sealing packing; when the valve stem is rotated in the forward direction, the pin forms a combination with the pin hole, and after deducting the partial torque of the valve stem, the combination effect between the ball and the valve seat is evaluated.

Description

Technical Field

[0001] The invention relates to the field of ball valves, and in particular to a control method for a high-safety ball valve for a petroleum pipeline. Background Art

[0002] The main structure of the ball valve is a sphere with a flow channel in the middle. The flow rate is adjusted by rotating the sphere. In general, the ball valve has the function of switching between opening and closing. In some cases, the flow rate can also be adjusted by adjusting the angle of the sphere. Ball valves have the advantages of simple structure, easy operation, good sealing performance, etc. Ball valves are widely used in many industrial and civil fields.

[0003] Ball valves include floating and fixed types. Floating types are often used in low-pressure and low-safety environments, while fixed types are often used in high-pressure and high-precision environments. In fixed ball valves, the impact of the fluid on the ball is transferred to the fixed structure of the ball by fixing the upper and lower ends of the ball, which reduces damage to the mechanical structure of the ball and ensures the sealing effect between the ball and the valve seat. However, it is currently impossible to monitor whether the ball valve is properly installed or fails during use.

[0004] The sealing effect between the ball and the valve seat is calibrated by testing the valve stem driving torque, without considering the obstacles that the valve stem itself needs to overcome for rotation. In particular, when sealing packing is set at the valve stem position, the obstacles to the valve stem rotation are further increased. Summary of the invention

[0005] The main purpose of the present invention is to provide a control method for a high-safety ball valve for a petroleum pipeline, aiming to solve the problem that whether a fixed ball valve is properly installed or fails in use cannot be monitored.

[0006] In order to achieve the above object, the present invention provides a high safety ball valve for petroleum pipelines, comprising:

[0007] The valve body has a spherical cavity in the middle, and both ends of the spherical cavity are joint ends respectively. A valve stem seat and a bottom cover seat are arranged on the outer wall of the valve body;

[0008] A valve stem is extended into the valve stem seat, a boss ring is arranged on the outer periphery of the inner end of the valve stem, a plurality of mounting holes are arranged on the outer periphery of the valve stem and below the boss ring, an elastic pin assembly is arranged in the mounting hole, the elastic pin assembly comprises an elastic member arranged at the inner end of the mounting hole and a pin arranged at the outer end of the mounting hole, wherein one end of the pin in the width direction is a chamfered structure and the other end is a straight structure;

[0009] A gland cylinder is installed and extends into the valve stem seat, and a sealing packing is sandwiched between the inner end of the gland cylinder and the boss ring;

[0010] A sphere is arranged in the sphere cavity, wherein an upper cylindrical groove and a lower cylindrical groove are respectively arranged at the upper end and the lower end of the sphere, and a plurality of pin holes corresponding to the plurality of elastic pin assemblies are arranged on the circumference of the inner wall of the upper cylindrical groove;

[0011] Two valve seats are respectively arranged at two ends of the sphere;

[0012] A bottom cover assembly, comprising a bottom cover and a support shaft, wherein the bottom cover is mounted on the bottom cover seat, and the support shaft is disposed at the inner end of the bottom cover and clamps the ball with the valve stem in a vertical direction;

[0013] A torque sensor is arranged corresponding to the valve stem.

[0014] Furthermore, the support shaft penetrates through and is threadedly connected to the bottom cover, and a pressure sensor is clamped between the support shaft and the sphere.

[0015] Furthermore, the degree of engagement between the gland cylinder and the valve stem seat is adjustable.

[0016] Furthermore, a rotation drive is provided corresponding to the valve stem.

[0017] Furthermore, the torque sensor is a strain gauge and is installed on the valve stem.

[0018] Furthermore, the bottom of the pin is chamfered.

[0019] Furthermore, the shape of the pin hole in the width direction matches the shape of the pin.

[0020] The present invention also provides a control method, which is applied to the above-mentioned high-safety ball valve for oil pipelines, comprising:

[0021] S1, controlling the rotation drive to drive the valve stem to rotate in the opposite direction for one circle at a first preset angular velocity, and obtaining the sensing data of the torque sensor as no-load torque data;

[0022] S2. evaluating the installation effect of the valve stem according to the no-load torque data;

[0023] S3, controlling the rotation drive to drive the valve stem to rotate in the positive direction for one circle at a second preset angular velocity, and obtaining the sensing data of the torque sensor as load torque data;

[0024] S4. Based on the no-load torque data, the load torque data is corrected and then the installation effect of the ball is evaluated.

[0025] Furthermore, the step of S4 includes:

[0026] The average value of the no-load torque data is calculated to obtain an average torque value, and the installation effect of the ball is evaluated after deducting the average torque value from the load torque data.

[0027] Furthermore, the step S1 includes:

[0028] The adjustment of the support shaft is guided according to the sensing data obtained from the pressure sensor.

[0029] The present invention provides a control method for a high-safety ball valve for an oil pipeline, wherein a plurality of elastic pin assemblies are arranged on the outer periphery of a valve stem, one end of the pin in the width direction is a chamfered structure and the other end is a straight structure, a plurality of pin holes corresponding to the plurality of elastic pin assemblies are arranged on the circumference of the inner wall of an upper cylindrical groove of a sphere, and a torque sensor is arranged corresponding to the valve stem to monitor the torque of the valve stem; when the valve stem rotates in the reverse direction, the pin will not form a stable combination with the pin hole, and the torque sensor data obtained in this process can evaluate the fixing effect of the valve stem and the installation effect of the sealing packing; when the valve stem rotates in the positive direction, the pin and the pin hole form a stable combination, and after deducting the partial torque of the valve stem, the torque sensor data can evaluate the combination effect between the ball and the valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 1 is a schematic diagram of a high safety ball valve for petroleum pipelines according to a first embodiment of the present invention;

[0031] Figure 2 It is a cross-sectional schematic diagram of a high-safety ball valve for oil pipelines according to the first embodiment of the present invention (a schematic diagram of the combination of a pin and a pin hole);

[0032] Figure 3 It is a cross-sectional schematic diagram of a high-safety ball valve for oil pipelines according to the first embodiment of the present invention (a schematic diagram of a pin falling out of a pin hole);

[0033] Figure 4 It is a cross-sectional schematic diagram of a valve body in a high safety ball valve for petroleum pipelines in a first embodiment of the present invention;

[0034] Figure 5 It is a cross-sectional schematic diagram of a ball in a high-safety ball valve for petroleum pipelines in the first embodiment of the present invention;

[0035] Figure 6 It is a cross-sectional schematic diagram of a valve stem in a high-safety ball valve for petroleum pipelines according to a first embodiment of the present invention;

[0036] Figure 7 yes Figure 6 A partial enlarged view of the

[0037] Figure 8 It is a schematic diagram of a valve stem in a high safety ball valve for petroleum pipelines according to a first embodiment of the present invention;

[0038] Fig. 9 yes Figure 8 A partial enlarged view of the .

[0039] Figure numerals: valve body (100), ball cavity (110), joint end (120), valve stem seat (130), bottom cover seat (140), valve stem (200), boss ring (210), mounting hole (220), elastic member (231), pin (232), gland cylinder (300), sealing packing (310), ball (400), upper cylindrical groove (410), lower cylindrical groove (420), pin hole (411), valve seat (500), bottom cover (610), support shaft (620), pressure sensor (630).

[0040] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0041] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0042] Those skilled in the art will appreciate that, unless expressly stated otherwise, the singular forms "a", "an", "said", "above", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present invention refers to the presence of the features, integers, steps, operations, elements, units, modules, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, units, modules, components, and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be intermediate elements. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any unit and all combinations of one or more associated listed items.

[0043] Those skilled in the art will understand that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as those generally understood by those skilled in the art in the field to which the present invention belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0044] Reference Figures 1 to 9 In one embodiment of the present invention, a high safety ball valve for a petroleum pipeline comprises:

[0045] The valve body 100 has a spherical cavity 110 in the middle, and the two ends of the spherical cavity 110 are joint ends 120 respectively. The outer wall of the valve body 100 is provided with a valve stem seat 130 and a bottom cover seat 140;

[0046] The valve stem 200 is inserted into the valve stem seat 130, and a boss ring 210 is provided on the outer periphery of the inner end of the valve stem 200. A plurality of mounting holes 220 are provided on the outer periphery of the valve stem 200 and below the boss ring 210. An elastic pin assembly is provided in the mounting hole 220. The elastic pin assembly includes an elastic member 231 provided at the inner end of the mounting hole 220 and a pin 232 provided at the outer end of the mounting hole 220, wherein one end of the pin 232 in the width direction is a chamfered structure and the other end is a straight structure;

[0047] A gland cylinder 300 is installed and extends into the valve stem seat 130 , and a sealing packing 310 is sandwiched between the inner end of the gland cylinder 300 and the boss ring 210 ;

[0048] The sphere 400 is disposed in the sphere cavity 110. The upper end and the lower end of the sphere 400 are respectively provided with an upper cylindrical groove 410 and a lower cylindrical groove 420. The inner wall of the upper cylindrical groove 410 is provided with a plurality of pin holes 411 corresponding to the plurality of elastic pin assemblies on the circumferential direction.

[0049] Two valve seats 500 are respectively disposed at two ends of the sphere 400;

[0050] A bottom cover assembly, comprising a bottom cover 610 and a support shaft 620, wherein the bottom cover 610 is mounted on the bottom cover seat 140, and the support shaft 620 is disposed at the inner end of the bottom cover 610 and clamps the ball 400 with the valve stem 200 in a vertical direction;

[0051] The torque sensor is arranged corresponding to the valve stem 200 .

[0052] In the prior art, it is currently impossible to monitor whether a fixed ball valve has been properly installed or has failed during use; the sealing effect between the ball and the valve seat is calibrated by testing the valve stem driving torque, without considering the obstacles that the valve stem itself needs to overcome when rotating, especially when a sealing packing is provided at the valve stem position, the obstacle to the rotation of the valve stem is further increased.

[0053] In the present invention, a high safety ball valve for oil pipelines has a ball cavity 110 in the middle of the valve body 100, and joint ends 120 at both ends of the ball cavity 110. A valve stem seat 130 and a bottom cover seat 140 are arranged on the outer wall of the valve body 100. A flange structure or a threaded structure is arranged on the valve stem seat 130 or the bottom cover seat 140 to provide a basis for subsequent parts installation.

[0054] The valve stem 200 is inserted into the valve stem seat 130. A boss ring 210 is provided on the outer periphery of the inner end of the valve stem 200. The boss ring 210 provides a basis for the subsequent installation of the sealing packing 310. A plurality of mounting holes 220 are provided on the outer periphery of the valve stem 200 and below the boss ring 210. An elastic pin assembly is provided in the mounting hole 220. The elastic pin assembly includes an elastic member 231 provided at the inner end of the mounting hole 220 and a pin 232 provided at the outer end of the mounting hole 220. The number of elastic pin assemblies can be 2, 4, 6, 8, etc., which provide a basis for the stable combination with the subsequent ball 400. The elastic action of the elastic member 231 pushes the pin 232 out of the mounting hole 220. Refer to Fig. 9 , one end of the pin 232 in the width direction is a chamfered structure and the other end is a straight structure. For example, the shape of the pin 232 is similar to the shape of the oblique tongue in the lock body structure, so that the elastic pin assembly can be retracted when pressed in one thickness direction, but will not be retracted when pressed in the other thickness direction. The rotation mode of the valve stem 200 can be manual or motor-driven, which is selected according to different application scenarios. A mechanical or electrically controlled angle limiting device can be set corresponding to the valve stem 200 to complete the limitation of the rotation angle of the valve stem 200.

[0055] The gland cylinder 300 is installed and extends into the valve stem seat 130. A sealing packing 310 is sandwiched between the inner end of the gland cylinder 300 and the boss ring 210. The gland cylinder 300 and the valve stem 200 act to compress the sealing packing 310, thereby generating a sealing effect in both the radial and longitudinal directions of the valve stem 200. The type of the sealing packing 310 is not limited, and can be various types such as rubber or graphite.

[0056] The sphere 400 is arranged in the sphere cavity 110. The upper end and the lower end of the sphere 400 are respectively provided with an upper cylindrical groove 410 and a lower cylindrical groove 420. The upper cylindrical groove 410 and the lower cylindrical groove 420 provide a basis for fixing the upper and lower ends of the sphere 400. A plurality of pin holes 411 corresponding to a plurality of elastic pin assemblies are arranged on the circumferential direction of the inner wall of the upper cylindrical groove 410. Since one end of the pin 232 in the width direction is a chamfered structure and the other end is a straight structure, when the elastic pin assembly extends into the pin hole 411, when the valve stem 200 rotates in one direction, the straight end of the pin 232 interacts with the pin hole 411, and the pin 232 does not retract and drives the sphere 400 to rotate; when the valve stem 200 rotates in the other direction, the chamfered end of the pin 232 interacts with the pin hole 411, and the pin 232 retracts, and at this time, the valve stem 200 rotates by itself without driving the sphere 400 to rotate.

[0057] The two valve seats 500 are respectively arranged at the two ends of the sphere 400. The sealing method between the valve seat 500 and the sphere 400 can be hard sealing and / or soft sealing. The specific fixing method of the valve seat 500 is not limited, and can refer to various common methods in the prior art.

[0058] The bottom cover assembly includes a bottom cover 610 and a support shaft 620. The bottom cover 610 is installed on the bottom cover seat 140. The support shaft 620 is arranged at the inner end of the bottom cover 610 and clamps the ball 400 in the vertical direction with the valve stem 200. The connection between the bottom cover assembly and the bottom cover seat 140 can be a flange connection or a bolt connection, which is not specifically limited. The support shaft 620 and the valve stem 200 work together to fix the ball 400, and the impact force on the ball 400 is transmitted to the support shaft 620 and the valve stem 200, so that the ball 400 is protected and the sealing effect is guaranteed.

[0059] The torque sensor is set corresponding to the valve stem 200. By introducing the torque sensor, the torque of the valve stem 200 during operation can be detected, so as to adjust and monitor the operation of the high-safety ball valve. The torque sensor is not limited to being installed on the valve stem 200. For example, a rotation drive is set corresponding to the valve stem 200, and a torque sensor is set on the rotation drive, so that the output torque of the rotation drive can be monitored.

[0060] After the installation of the high-safety ball valve is completed, first, the valve stem 200 is rotated in the reverse direction. At this time, the pin 232 will not form a stable combination with the pin hole 411. The torque sensor data obtained in this process can evaluate the fixing effect of the valve stem 200 and the installation effect of the sealing packing 310; then, the valve stem 200 is rotated in the positive direction. At this time, the pin 232 and the pin hole 411 form a stable combination. The torque sensor data obtained in this process can evaluate the combination effect between the ball 400 and the valve seat 500. During the evaluation process, it is necessary to deduct the valve stem 200 part from the relevant data in the torque sensor, so as to provide monitoring for the installation and operation of the ball 400.

[0061] In summary, a plurality of elastic pin assemblies are arranged on the outer periphery of the valve stem 200, one end of the pin 232 in the width direction is a chamfered structure and the other end is a straight structure, a plurality of pin holes 411 corresponding to the plurality of elastic pin assemblies are arranged on the circumference of the inner wall of the upper cylindrical groove 410 of the sphere 400, and the torque sensor is arranged corresponding to the valve stem 200 to monitor the torque of the valve stem 200; the valve stem 200 rotates in the reverse direction, at which time the pin 232 will not form a stable combination with the pin hole 411, and the torque sensor data obtained in this process can evaluate the fixing effect of the valve stem 200 and the installation effect of the sealing packing 310; the valve stem 200 rotates in the positive direction, at which time the pin 232 forms a stable combination with the pin hole 411, and after deducting part of the torque of the valve stem 200, the torque sensor data can evaluate the combination effect between the sphere 400 and the valve seat 500.

[0062] Reference Figures 1 to 4In one embodiment, the support shaft 620 penetrates and is threadedly connected to the bottom cover 610 , and a pressure sensor 630 is clamped between the support shaft 620 and the sphere 400 .

[0063] In this embodiment, by adjusting the support shaft 620 on the bottom cover 610, the support degree of the support shaft 620 for the ball 400 can be corrected, so that the interaction effect between the ball 400 and the valve seat 500 is optimal, and the best use effect of the high-safety ball valve for oil pipelines is guaranteed. The data guiding the adjustment of the support shaft 620 comes from the pressure sensor 630. The specific model of the pressure sensor 630 is not limited, and the pressure data that can monitor the ball 400 and the support shaft 620 shall prevail. It should be noted that the pressure sensor 630 does not need to test the pressure data in real time, and can only derive the relevant data line. When it is necessary to detect the pressure data, the data line is used for detection.

[0064] In one embodiment, the degree of engagement between the capping cylinder 300 and the valve stem seat 130 is adjustable.

[0065] In this embodiment, the compression degree of the sealing packing 310 can be adjusted by adjusting the gland cylinder 300. Specifically, the connection mode between the gland cylinder 300 and the valve stem seat 130 is preferably but not limited to a threaded connection. The parameters guiding the adjustment of the gland cylinder 300 can come from the torque sensor. For example, when the sealing packing 310 is over-compressed, the friction force formed between the sealing packing 310 and the valve stem 200 is greater, and the monitoring data of the torque sensor on the valve stem 200 is improved (the valve stem 200 needs to rotate in a specific direction to avoid driving the rotation of the ball 400). At this time, the compression degree of the sealing packing 310 can be adjusted by adjusting the gland cylinder 300.

[0066] In one embodiment, a rotation drive is provided corresponding to the valve stem 200 .

[0067] In this embodiment, the valve stem 200 is rotated by a rotary drive. The type of the rotary drive is not limited. It can be a rotary motor type, and cooperates with a reduction box to complete the rotation of the valve stem 200. The torque sensor can be set on the valve stem 200 or the rotary drive. The angle of the rotary drive output needs to be monitored, for example, the output angle is controlled by a grating or a travel switch, so that the angle of the ball 400 can be mastered.

[0068] In one embodiment, the torque sensor is a strain gauge and is mounted on the valve stem 200 .

[0069] In this embodiment, the torque sensor is installed on the outer wall of the valve stem 200, so that when the valve stem 200 rotates, the torque sensor can obtain a corresponding sensor signal. The above torque sensor does not need to continuously obtain torque data during the use of the high-safety ball valve. The torque sensor only needs to be started during installation, debugging and maintenance. In this case, the structural complexity of the high-safety ball valve will not be significantly increased.

[0070] Reference Fig. 9 In one embodiment, the bottom of the pin 232 is chamfered.

[0071] In this embodiment, the bottom of the pin 232 is chamfered so that the pin 232 can retract smoothly during the downward installation of the valve stem 200; during the removal of the valve stem 200, the valve stem 200 is first rotated a certain amount, and then the pin 232 retracts to complete the removal action.

[0072] In one embodiment, the shape of the pin hole 411 in the width direction matches the shape of the pin 232 .

[0073] In this embodiment, the shape of the pin hole 411 is restricted to match the shape of the pin 232. If one side of the pin 232 in the width direction is a chamfered structure, the corresponding position of the pin hole 411 is also set to a chamfered structure; if the other end of the pin 232 in the width direction is a straight structure, the corresponding position of the pin hole 411 is also set to a straight structure. Therefore, when the valve stem 200 rotates in a specific direction, the pin 232 will fall out of the pin hole 411, and when the valve stem 200 rotates in another direction, the pin 232 and the pin hole 411 form a stable combination in the circumferential direction.

[0074] The present invention also provides a control method, which is applied to the above-mentioned high-safety ball valve for oil pipelines, comprising:

[0075] S1, controlling the rotation drive to drive the valve stem 200 to rotate in the opposite direction for one circle at a first preset angular velocity, and obtaining the sensing data of the torque sensor as no-load torque data;

[0076] S2. evaluating the installation effect of the valve stem 200 according to the no-load torque data;

[0077] S3, controlling the rotation drive to drive the valve stem 200 to rotate in the positive direction for one circle at a second preset angular velocity, and obtaining the sensing data of the torque sensor as load torque data;

[0078] S4. After correcting the load torque data based on the no-load torque data, the installation effect of the ball 400 is evaluated.

[0079] In this embodiment, in step S1, the rotation drive is controlled to drive the valve stem 200 to rotate in the opposite direction for one circle at a first preset angular velocity, and the sensing data of the torque sensor is obtained as no-load torque data. Since the rotation speed has been limited, the torque data obtained at the valve stem 200 at this time has analyzable value. During the process of the valve stem 200 rotating in the opposite direction, the pin 232 will not form a stable combination with the pin hole 411 at this time, and will also come out after the combination. The no-load torque data specifically includes a torque value and corresponding angle data. At the angle at which the pin 232 is combined with the pin hole 411, the torque value of the no-load torque data will fluctuate. When the pin 232 comes out of the pin hole 411 and combines with the inner wall of the upper cylindrical groove 410, the torque value of the no-load torque data can largely reflect the installation status of the valve stem 200.

[0080] In step S2, the installation effect of the valve stem 200 is evaluated based on the no-load torque data. Specifically, after excluding some data (data when the pin 232 is combined with the pin hole 411), the installation effect of the valve stem 200 can be evaluated using tools such as range, variance, standard deviation or coefficient of variation.

[0081] In step S3, the rotation drive is controlled to drive the valve stem 200 to rotate in the positive direction for one revolution at a second preset angular velocity, and the sensing data of the torque sensor is obtained as load torque data. During the positive rotation of the valve stem 200, the pin 232 forms a stable combination with the pin hole 411, and the load torque data includes a torque value and corresponding angle data, and the specific torque value mainly includes the ball 400 and the valve stem 200.

[0082] In step S4, the installation effect of the ball 400 is evaluated after the load torque data is corrected based on the no-load torque data. The torque of the valve stem 200 is fitted through the no-load torque data, and then deducted from the load torque data. At this time, the load torque data can be used as an evaluation of the installation effect of the ball 400. The fitting method of the torque of the valve stem 200 can be various, such as the average method or the weighted average method.

[0083] In one embodiment, the step of S4 includes:

[0084] The average value of the no-load torque data is calculated to obtain an average torque value, and the installation effect of the ball 400 is evaluated after deducting the average torque value from the load torque data.

[0085] In this embodiment, a method for obtaining the torque of the valve stem 200 is provided, which has the advantages of being simple and convenient.

[0086] In one embodiment, the step S1 includes:

[0087] The adjustment of the support shaft 620 is guided according to the sensing data obtained from the pressure sensor 630 .

[0088] In this embodiment, before adjusting and testing the high-safety ball valve for oil pipelines, the support degree of the support shaft 620 for the ball 400 can be corrected by adjusting the support shaft 620 on the bottom cover 610, so that the interaction between the ball 400 and the valve seat 500 is optimal, ensuring the best use effect of the high-safety ball valve for oil pipelines. The data guiding the adjustment of the support shaft 620 comes from the pressure sensor 630. The specific model of the pressure sensor 630 is not limited, and the pressure data that can monitor the ball 400 and the support shaft 620 shall prevail. It should be noted that the pressure sensor 630 does not need to test the pressure data in real time, and can only derive the relevant data line. When it is necessary to detect the pressure data, the data line is used for detection.

[0089] In summary, the control method of the high-safety ball valve for oil pipeline provided by the present invention is that a plurality of elastic pin assemblies are arranged on the outer periphery of the valve stem 200, one end of the pin 232 in the width direction is a chamfered structure and the other end is a straight structure, and a plurality of pin holes 411 corresponding to the plurality of elastic pin assemblies are arranged on the inner wall circumferentially of the upper cylindrical groove 410 of the sphere 400, and the torque sensor is arranged corresponding to the valve stem 200 to monitor the torque of the valve stem 200; the valve stem 200 rotates in the reverse direction, at which time the pin 232 will not form a stable combination with the pin hole 411, and the torque sensor data obtained in this process can evaluate the fixing effect of the valve stem 200 and the installation effect of the sealing packing 310; the valve stem 200 rotates in the positive direction, at which time the pin 232 forms a stable combination with the pin hole 411, and after deducting part of the torque of the valve stem 200, the torque sensor data can evaluate the combination effect between the ball 400 and the valve seat 500.

[0090] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A control method for a high safety ball valve for a petroleum pipeline, characterized in that: The high safety ball valve for oil pipeline comprises: The valve body has a spherical cavity in the middle, and both ends of the spherical cavity are joint ends respectively. A valve stem seat and a bottom cover seat are arranged on the outer wall of the valve body; A valve stem is extended into the valve stem seat, a boss ring is arranged on the outer periphery of the inner end of the valve stem, a plurality of mounting holes are arranged on the outer periphery of the valve stem and below the boss ring, an elastic pin assembly is arranged in the mounting hole, the elastic pin assembly comprises an elastic member arranged at the inner end of the mounting hole and a pin arranged at the outer end of the mounting hole, wherein one end of the pin in the width direction is a chamfered structure and the other end is a straight structure; A gland cylinder is installed and extends into the valve stem seat, and a sealing packing is sandwiched between the inner end of the gland cylinder and the boss ring; A sphere is arranged in the sphere cavity, wherein an upper cylindrical groove and a lower cylindrical groove are respectively arranged at the upper end and the lower end of the sphere, and a plurality of pin holes corresponding to the plurality of elastic pin assemblies are arranged on the circumference of the inner wall of the upper cylindrical groove; Two valve seats are respectively arranged at two ends of the sphere; A bottom cover assembly, comprising a bottom cover and a support shaft, wherein the bottom cover is mounted on the bottom cover seat, and the support shaft is disposed at the inner end of the bottom cover and clamps the ball with the valve stem in a vertical direction; A torque sensor is arranged corresponding to the valve stem; Wherein, the support shaft penetrates and is threadedly connected to the bottom cover, and a pressure sensor is clamped between the support shaft and the sphere; The degree of engagement between the gland cylinder and the valve stem seat is adjustable; A rotation drive is provided corresponding to the valve stem; The control method comprises: S1, controlling the rotation drive to drive the valve stem to rotate in the opposite direction for one circle at a first preset angular velocity, and obtaining the sensing data of the torque sensor as no-load torque data; S2. evaluating the installation effect of the valve stem according to the no-load torque data; S3, controlling the rotation drive to drive the valve stem to rotate in the positive direction for one circle at a second preset angular velocity, and obtaining the sensing data of the torque sensor as load torque data; S4. Based on the no-load torque data, the load torque data is corrected and then the installation effect of the ball is evaluated.

2. The control method of the high safety ball valve for oil pipeline according to claim 1 is characterized in that: The torque sensor is a strain gauge and is mounted on the valve stem.

3. The control method of the high safety ball valve for oil pipeline according to claim 1, characterized in that: The bottom of the pin is chamfered.

4. The control method of the high safety ball valve for oil pipeline according to claim 1 is characterized in that: The shape of the pin hole in the width direction matches the shape of the pin.

5. The control method of a high safety ball valve for a petroleum pipeline according to claim 1, characterized in that: The steps of S4 include: The average value of the no-load torque data is calculated to obtain an average torque value, and the installation effect of the ball is evaluated after deducting the average torque value from the load torque data.

6. The control method of the high safety ball valve for oil pipeline according to claim 1, characterized in that: The step of S1 includes: The adjustment of the support shaft is guided according to the sensing data obtained from the pressure sensor.

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