Intelligent adaptive control method for soft sealing frictionless ball valve

Abstract

The application discloses a soft sealing frictionless ball valve intelligent adaptive control method, and relates to the technical field of valve control, which comprises the following steps: in step one, a perturbation is superimposed on the seat section to determine the instant of the contact seat by judging the residual point of the stiffness mutation and the non-contact stroke reference curve, and the position of the contact seat and the local stiffness are output; in step two, the pressure difference, temperature and seat ring material are collected, the minimum necessary compression load is calculated, and the upper limit of the allowable torque-angle curve is generated; in step three, the smooth closing trajectory is executed with the position of the contact seat as the starting point, the minimum necessary compression load is reached under the amplitude limitation, and the process is stopped, and the contact energy and sealing confirmation are recorded; in step four, the breathing type pressure maintaining is implemented in the maintaining stage, the seat ring health index is formed, and the material-temperature correction coefficient is written back. The method can reduce overload and underload, stabilize zero visible leakage, reduce energy consumption and prolong the service life of the soft seat, improve the predictability of operation and maintenance and the consistency of parameters, and support online diagnosis and maintenance decision.

Description

Technical Field

[0001] This invention relates to the field of valve control technology, specifically to an intelligent adaptive control method for soft-seal frictionless ball valves. Background Technology

[0002] Soft-seal ball valves are widely used in petrochemical, natural gas, air separation, and utility engineering units as key components for switching, isolation, and tight shut-off. These valves are used in environments with significant differences in medium pressure, temperature cycles, and opening / closing frequencies. Typical operating conditions include rapid switching under high pressure differentials, alternating hot and cold conditions, and media containing particles or viscous substances.

[0003] The materials used for valve seats are mostly polytetrafluoroethylene (PTFE), modified or filled PTFE, polyetheretherketone (PEEK), etc., which have viscoelastic and cold flow properties and are sensitive to compression loads and holding time. The actuators are mostly pneumatic quarter-turn or electric motor driven; the former is often equipped with a Scottish cycloidal mechanism, and the output torque varies with the angle, being "high at both ends and low in the middle." To ensure shut-off, existing devices generally employ stroke-cut-off or fixed-torque seating, combined with valve fingerprinting, partial stroke testing, and alarm monitoring. Meanwhile, some devices require low volatile emissions and long-term position retention, causing the valve stem packing and seat ring to be under high load for extended periods.

[0004] Under the aforementioned technical system, there are still common failure chains and cost burdens: First, the stroke cut-off is replaced by a preset stroke instead of contact judgment, and the fixed torque seating is replaced by an empirical ratio instead of working conditions and material constraints. Neither of these can identify the "contact seat" in real time at the end of the closure and apply the "minimum necessary pressing load" based on the pressure difference, temperature and seat material bearing capacity. Second, the angle transmission characteristics of the pneumatic actuator do not match the torque required by the valve. Increasing the seat load according to the "guarantee" approach can easily lead to soft seat overpressure, local extrusion and wear, which in turn causes the starting torque to climb, energy consumption to increase and the sealing level to deteriorate. Third, the goal of zero leakage and long-term maintenance coexist. Continuous high load maintenance accelerates viscoelastic relaxation and cold flow, and repeated pressure replenishment amplifies air / electricity consumption and impact. Fourth, existing diagnostics are mostly limited to the recording and alarm level, which cannot reverse the constraint of the closing load and maintain the cycle time. It also lacks quantitative management of contact seat drift, hysteresis increase and contact energy accumulation.

[0005] Maintenance typically addresses these issues by increasing the closure safety factor or shortening the replacement cycle, but this leads to increased energy consumption and spare parts costs. These problems are particularly pronounced in scenarios with frequent high pressure differential switching, fluctuating temperatures, and limited maintenance windows, often resulting in early internal leakage, over-supplied actuators, unplanned downtime, and escalating maintenance costs. Current technology cannot accurately determine the contact moment between the valve ball and seat under actual operating conditions at the end of the soft-seal ball valve's closure phase, and cannot apply only the minimum necessary pressure load to meet the specified leakage level while simultaneously considering pressure differential, temperature, seat material viscoelastic constraints, and actuator angular transmission characteristics. Therefore, it is difficult to avoid the risks of wear, energy consumption, and seal degradation caused by overload or underload. Summary of the Invention

[0006] (a) Technical problems to be solved

[0007] To address the shortcomings of existing technologies, this invention provides an intelligent adaptive control method for soft-seal frictionless ball valves. This method includes: superimposing micro-perturbations on the seat section; determining the contact point instant using stiffness abrupt changes and the residual change point of the non-contact stroke reference curve; outputting the contact point position and local stiffness; collecting pressure difference, temperature, and seat material data; calculating the minimum necessary pressure load and generating an allowable torque upper limit-angle curve; executing a smooth, slow-closing trajectory starting from the contact point position; stopping when the minimum necessary pressure load is reached within a limited range; and recording contact energy and sealing confirmation; implementing a breathing-type pressure holding phase and generating a seat health index; writing back the material-temperature correction coefficient; reducing energy consumption and extending the soft seat life; improving maintenance predictability and parameter consistency; and supporting online diagnostics, thereby solving the technical problems described in the background art.

[0008] (II) Technical Solution

[0009] To achieve the above objectives, the present invention provides the following technical solution:

[0010] The intelligent adaptive control method for a soft-seal frictionless ball valve includes: superimposing a limited-amplitude micro-perturbation in the final stroke near the valve seat; determining the instant of contact with the valve seat based on the stiffness abrupt change of the load-displacement curve combined with the residual change point of the non-contact stroke reference curve; outputting the contact seat position and local stiffness; collecting information on the pressure difference across the valve, valve body temperature, and seat ring material; calculating the minimum necessary pressure load to satisfy zero visible leakage; and generating an upper limit of allowable torque versus angle curve that varies with the angle according to the mechanism transmission geometry, taking the minimum value of the maximum allowable torque of the valve stem.

[0011] Starting from the contact seat position, a smooth, slow-closing trajectory with continuous speed is generated. It advances within the limit of the allowable torque upper limit-angle curve, and stops increasing the load when the minimum necessary pressure load is reached. The contact energy is recorded and a seal confirmation based on pressure and valve position stability is performed. During the holding phase, the breathing pressure holding cycle and amplitude are set according to the viscoelastic time constant and contact energy, and are constrained by the allowable torque upper limit-angle curve. The contact seat drift, breaking torque and energy accumulation are extracted to form the seat health index, which is written back to the material-temperature correction factor.

[0012] Furthermore, the perturbation is a micro-pulse of the differential pressure in the output chamber or a micro-step of the motor current, the amplitude of which is constrained by the maximum allowable torque of the valve stem and the actuator parameters; a baseline is established using the non-contact stroke reference curve, and the contact seat position and local stiffness are determined by the first exceedance of the limit according to the fusion criterion threshold. The seat section window is a preset interval for the end of the full stroke. The fusion criterion is composed of equivalent stiffness and residual cumulative amount normalized weighted, and a judgment sequence is formed by synchronously collecting data with a unified timestamp.

[0013] Furthermore, structural coordination verification is performed before entering the seat section; for valve bodies with retractable valve seats or lifting and tilting mechanisms, a pre-disengagement segment is first performed, and the slope of the non-contact stroke reference curve is reduced as the retraction criterion. Then, the seat confirmation is completed and output according to the perturbation and fusion criterion process. After the pre-disengagement segment is completed, the seat section window is aligned with the same valve position calibration coordinates, and the sampling frequency is kept consistent to complete the data handover.

[0014] Furthermore, the minimum necessary pressure load is obtained by multiplying the operating condition safety factor function with the material-temperature-holding time viscoelastic factor on the basis of the pressure difference and the pressure area of ​​the valve orifice; and the effective contact area and the allowable contact stress of the material are used for verification. When the limit is exceeded, the parameters are converged in a predetermined order or the conservative closure is switched. The operating condition safety factor function is a monotonically non-decreasing piecewise function, and the viscoelastic factor is read by matching the material library table entries with the holding time.

[0015] Furthermore, based on the actuator type spectrum and the interpolation of the survey points, the equivalent force arm is obtained. The transmission efficiency is obtained based on the valve fingerprint regression and the angle transmission coefficient is constructed. The minimum necessary pressure load is mapped to the torque domain curve using the angle transmission coefficient, and the maximum allowable torque of the valve stem is taken angle by angle to generate the upper limit of allowable torque-angle curve. The equivalent force arm adopts monotonic interpolation, and the transmission efficiency is bounded by the historical fingerprint curve. Both are output with the same angle resolution.

[0016] Furthermore, a smooth, gradually closing trajectory with zero endpoint velocity and acceleration is adopted. The nominal drive is generated by position-velocity servo and constrained by the allowable torque upper limit-angle curve by the amplitude limiting operator. When the amplitude limit is reached, inverse integration freeze is performed. The contact energy is recorded by integrating the measured equivalent torque in the angle domain. The starting point of the trajectory is taken as the contact seat position and the propulsion range is limited by the displacement of the last segment. After reaching the minimum necessary pressing load, it switches to holding.

[0017] Furthermore, after reaching the minimum necessary compression load, the downstream pressure and valve position curves are obtained for a fixed holding time, and the seal is confirmed using a weighted stability criterion. If the condition is not met, a limited number of retests are performed according to the predetermined load increment, and the retest strategy parameters are recorded. The maximum number of retests is the upper limit parameter. If the upper limit is exceeded, the conservative closure mode is switched, and each retest is recalculated within the same holding range and a retest record is generated.

[0018] Furthermore, based on the viscoelastic time constant and the ratio of contact energy to rated energy, the breathing pressure holding cycle is determined. The amplitude is obtained by taking the minimum value of the difference between the allowable torque upper limit-angle curve and the actual holding torque, as well as the material amplitude upper limit, according to the angular position, and the duty cycle is limited. Both the amplitude and the duty cycle are constrained by the allowable torque upper limit-angle curve and are executed with a unified time reference in the pneumatic or electric channel.

[0019] Furthermore, a percentage-based seat health index is constructed based on characteristics such as seat drift, accumulated contact energy, breaking torque, and hysteresis area. The health index is generated using bounded mapping.

[0020] The health index is mapped to a four-state diagnostic status based on a preset threshold range, and archived on a time axis according to the cycle. The four-state diagnostic status includes four categories: maintenance required, functional check, exceeding specifications, and fault. The threshold range is the online parameter, and it is called by a unified variable name throughout the cycle for invocation.

[0021] Furthermore, the seat health index is used as a weight to write back the material-temperature correction coefficient, and the breathing pressure holding cycle, amplitude and duty cycle are adjusted simultaneously; all write-back parameters and load limit delivery documents are archived with version numbers, the latest version of parameter set and curves are called, and after writing back, parameter version numbers are generated and locked as the currently effective configuration. The configuration is automatically referenced in the next calculation of minimum necessary compression load and restricted slow closing trajectory.

[0022] (III) Beneficial Effects

[0023] This invention provides an intelligent adaptive control method for a soft-seal frictionless ball valve, which has the following beneficial effects:

[0024] By superimposing a limited perturbation on the seat section and jointly determining the instant of contact with the contact seat by the equivalent stiffness mutation and the residual change point of the non-contact stroke reference curve, the fixed stroke point is avoided from replacing the actual contact. The contact seat position and local stiffness are uniquely output, providing an accurate starting point for subsequent load limiting and trajectory generation.

[0025] Collect the pressure difference across the valve and the valve body temperature, and associate them with the seat ring material information. Combine the mechanism transmission geometry and angle transmission coefficient to calculate the minimum necessary pressing load, generate the upper limit of allowable torque-angle curve, and merge it with the maximum allowable torque point state of the valve stem to establish the upper limit of the full stroke and the threshold for stopping the load increase.

[0026] Construct a smooth, gradual closing trajectory with continuous endpoint velocity and acceleration, advance within the hard limit of the allowable torque upper limit-angle curve, stop increasing the load when the minimum necessary pressure load is reached, and simultaneously record the contact energy and complete the seal confirmation and archiving with pressure and valve position stability.

[0027] Based on the viscoelastic time constant and combined with the previous contact energy and rated energy, the breathing pressure holding cycle and amplitude are set. The amplitude and duty cycle are constrained by the allowable torque upper limit-angle curve and the actual holding torque, replacing the continuous compression method and suppressing material relaxation and deformation accumulation caused by long-term holding. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the intelligent adaptive control method for a soft-seal frictionless ball valve according to the present invention. Detailed Implementation

[0029] 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. 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.

[0030] Please see Figure 1 This invention provides an intelligent adaptive control method for a soft-seal frictionless ball valve, comprising:

[0031] Step 1: In the seat-adjacent section, a near-seat response is induced by a perturbation with limited amplitude. By combining the equivalent stiffness abrupt change with the residual change point of the non-contact stroke reference curve, the instant of contact between the valve ball and the seat ring is accurately identified. The contact position, local stiffness, and traceable non-contact reference are output. Recording is completed within a unified timestamp and seat-adjacent section window to ensure coordinate system consistency. This provides a consistent input and call starting point for subsequent allowable torque upper limit-angle curves, smooth closing, and breathing pressure holding. At the same time, a trigger flag for abnormal backoff is set.

[0032] To address the challenge of accurately determining whether a soft-seal ball valve has made contact with the valve seat during the final stroke near the seat due to the combined effects of medium pressure difference, valve body temperature, and the viscoelastic properties of the seat material, a proactive detection approach is proposed to replace guesswork in determining the stroke point. Typical field scenarios include: When a switching valve in a unit frequently opens and closes under high pressure differential conditions, and the control room issues a valve-closing command, the actuator enters the final stroke. If a fixed stroke point is still used to trigger slow closing or forced seating, mismatches can easily occur, such as deceleration before contact or increased load after contact, further exacerbating localized seat compression and cold flow, or causing underload leading to recurring internal leakage.

[0033] The mechanical response of the near-seat section is influenced by the viscoelasticity of the seat ring material, the pressure difference of the medium, and the transmission geometry of the mechanism. Without the introduction of controllable excitation, it is difficult to separate the contact-non-contact difference from the natural signal in a short time. By applying a small perturbation with limited amplitude in the near-seat section, a identifiable slope change is produced in the load-displacement curve. Combined with safety boundary constraints, this ensures that the maximum permissible torque of the valve stem is not touched.

[0034] The processing logic is divided into two layers: the allowable perturbation intensity is back-calculated from the torque domain to the pressure domain or current domain according to the transmission geometry of the mechanism; the response curve is interpolated and differentiated according to the near-seat interval sliding window to obtain a smooth first derivative, which is used to construct the stiffness abrupt change degree.

[0035] To ensure that the disturbance does not exceed the torque boundary, the maximum allowable torque of the valve stem is converted into the upper limit of the disturbance amplitude at each angular position using a transfer coefficient: ;

[0036] Disturbance pressure amplitude The upper limit is given by this formula, greater than 0 and not exceeding the gas supply capacity; disturbance intensity coefficient. : Used to leave a margin within the safety boundary, between 0 and 1; maximum permissible torque of the valve stem. : A constant given on the equipment nameplate or type test certificate; effective area of ​​the actuator piston. : Known structural parameters; Angular transfer coefficient Mapping actuator thrust to valve stem torque. This is the current valve position angle, from zero to a quarter turn.

[0037] In this implementation, the pneumatic channel uses differential injection via the output chamber, while the electric channel uses step injection via current. Both are triggered within the same seat section window, and the injection sequence follows a handover method where pressure-displacement recording is performed first, followed by the issuance of perturbations for verification. During application, the perturbation amplitude is limited within the seat section to prevent additional pressure on the seat ring due to local overload. Simultaneously, the comparison benchmark is kept consistent to ensure comparability of response curves under different operating conditions. The final state is a dual indication of perturbation injection completion and the safety boundary not being exceeded.

[0038] To quickly determine the deviation between the non-contact travel reference curve and the real-time curve during the seat-holding phase, a cumulative statistic of weighted residuals is introduced: ;

[0039] Cumulative Residual Statistics : Varies with valve position Monotonic accumulation, with no limit on the range of values; starting valve position near the seat section. : A fixed starting point under the current operating conditions; weighting function Use a Hanning or triangular window within the near-seat interval, with values ​​ranging from 0 to 1; sign function. Used to distinguish the direction of residuals;

[0040] Measured equivalent torque curve : Derived from pressure / current and geometry mapping; contactless stroke reference curve : Measured under conditions of deseatment or no differential pressure and obtained through cubic spline interpolation; Shape index Used to amplify large deviations, with a value range greater than or equal to 1.

[0041] In the implementation method, cubic spline interpolation is first used to... and Perform reconstruction at the same sampling rate, then integrate by window to form... . Perform a valve closure under unseated or zero differential pressure conditions, record the valve position, pressure, and current synchronously, and obtain the values ​​through cubic spline interpolation. The transmission is driven by pneumatic pressure difference, piston area, and actuator, or by "motor current, electromagnetic torque constant, reduction ratio, and efficiency mapping".

[0042] When applied, the residual statistics amplify the deviation in the near-seat region, highlighting the mechanical abrupt changes caused by contact in a weak noise background; a cumulative residual curve is generated on the page, providing input for subsequent fusion criteria.

[0043] The cumulative residuals alone are insufficient to eliminate the gradual change trend caused by low-frequency drift or slow pressing. It is necessary to introduce the slope information of the equivalent stiffness and integrate it with the residual statistics to form a more selective triggering quantity for contact events.

[0044] Here, the processing logic is divided into two layers: First, the equivalent stiffness function is obtained by smoothing the derivative with a local polynomial, and then the stiffness mutation degree is constructed by normalization and threshold setting; Second, a fusion criterion is constructed, which simultaneously absorbs the normalized amount of residual statistics and stiffness mutation degree, and searches for the first threshold crossing point, i.e., the contact position, in the near seat interval.

[0045] To suppress the influence of noise on the differentiation, a smooth differentiation is first performed within the seat section window using a local quadratic polynomial to obtain the equivalent stiffness function. ; then, the cumulative residual statistic Joint normalization generates fusion criteria: ;

[0046] Fusion Criteria Values ​​range from 0 to 1; fusion weights The value ranges from 0 to 1, and is given by engineering experience or offline tuning; equivalent stiffness function. : The first derivative of the measured equivalent load-valve position curve, with units matching the load / displacement; near-seat interval : The closed interval of the valve position of the seat section; cumulative residual statistics : The definition is the same as before.

[0047] In the implementation method, the equivalent stiffness function The denominator is taken as the nearest maximum value in the interval to complete interval normalization and avoid incomparability across working conditions; the cumulative residual statistic is... Synchronous normalization is used to ensure consistency of dimensions.

[0048] When applied, the fusion criterion superimposes two types of evidence, namely slope abrupt change and curve deviation, with equal or partial weights, significantly reducing the false alarm probability of a single criterion; the page displays the fusion criterion curve and the threshold line side by side, which helps on-duty personnel to verify.

[0049] To ensure the uniqueness of the determination, an initial threshold search is performed on the fusion criterion within the near-seat interval to obtain the estimated contact position: ;

[0050] Among them, contact position estimation : The unique solution within the nearest interval; Decision threshold The range of 0 to 1 is determined by background statistics obtained from multiple samplings under the contactless travel reference curve; the proximity interval Definitions are the same as above; fusion criteria : The definition is the same as before.

[0051] In this implementation, the search process employs a monotonic scanning strategy to ensure that the first threshold crossing occurs before any subsequent threshold crossing events in time; once the contact position is estimated... Upon confirmation, the page immediately highlights that the contact has been confirmed, and packages the contact position, equivalent torque curve at contact, and non-contact travel reference curve into a record file, which is then entered into the database according to the electronic handover process. In application, the first-time threshold crossing method naturally avoids repeated judgments caused by multi-peak interference, and the output is a single trigger point, facilitating downstream load limiting and slow-closing trajectory recall. The final state is a double confirmation of the contact position label and the completion of the record file generation. The measurement conditions still use the channel configuration and sampling frequency of the previous technical point.

[0052] Step 2: Given the determined contact seat, integrate the pressure difference across the valve, valve body temperature, and seat material information to calculate the minimum necessary pressure load to achieve zero visible leakage. Generate an upper limit torque-angle curve that varies with the angle based on the mechanism's transmission geometry. Simultaneously, perform contact stress verification and merge it with the maximum allowable torque point state of the valve stem into a hard limit. Output a load-limited delivery document for direct use during smooth and gradual closure. Maintain a consistent mapping between the material-temperature correction coefficient and the holding time, and archive the data synchronously.

[0053] If the pressure applied after the contact seat relies solely on a fixed empirical load, it can easily cause overpressure on the seat ring under high pressure differential and high temperature conditions, and underpressure under low pressure differential and low temperature conditions, leading to the recurrence of internal leakage. Therefore, it is necessary to adjust the pressure differential based on the known true starting point of the contact seat. The pressure-bearing area of ​​the valve orifice and the increase in required contact stress due to the material's viscoelasticity are unified to the minimum necessary compressive load. In a single dimension, thus providing a computable basis for subsequent finite twist lines.

[0054] The processing logic is divided into two parts: first, the static baseline is given by pressure difference minus area; then, the baseline is amplified by a viscoelastic enhancement factor based on material, temperature, and holding time. Simultaneously, a contact stress upper limit check and a background safety factor function are introduced. ,make This achieves the desired sealing rating without triggering cold flow or localized extrusion. All of the above quantities are estimated at the contact point. The interpretation of the proximity interval ensures that the coordinates and timing of the previous step's output are consistent with the current step's input.

[0055] After providing the pressures before and after the valve on the process side and confirming the valve port geometry on the operating side, a base number consisting of pressure difference, area, and safety factor is formed. Then, a viscoelastic factor considering material, temperature, and holding time is introduced to obtain the solution for the minimum necessary pressure load: ;

[0056] Minimum Necessary Press Load : The minimum pressure required to ensure zero visible leakage; the value must be a positive number.

[0057] Operating condition safety factor function As a monotonically non-decreasing function of pressure difference, it is used to resist small fluctuations and is greater than 1;

[0058] ;

[0059] in, : Slope constant; Reference pressure difference; Upper limit (e.g., 1.3); differential pressure across the valve. : Given by the pressure point at the site, the value is non-negative;

[0060] Valve port pressure area The value is determined by the geometry of the valve's internal components and is a positive number. Material-temperature-holding time viscoelastic factor, a deterministic expression based on the Kelvin-Voyt or standard linear solid model, is derived from a material library and holding time. It is mapped and its value range is greater than 1.

[0061] In the implementation method, viscoelastic factor The specific form is recorded in the material library as a parameter table, and can be read according to the three-dimensional index of material family-temperature range-holding time range; The function family is selected and the interval is locked by the running side to form a generalized-preferred-more preferred backoff hierarchy.

[0062] viscoelastic factor Based on the standard linear closed-form solution for solids, a deterministic expression with temperature-time effects is given: ;

[0063] Material-Temperature Gain (Materials Library Entries); : Viscoelastic relaxation time constant (see identification and write-back in step four); Duration of retention.

[0064] In application, multiplicative coupling combines the static basis and viscoelastic enhancement into a single dimension. This facilitates subsequent adjustment of the angle transfer coefficient. The mapping is shown on the page; the minimum necessary compressive load has been generated, avoiding the arbitrariness of empirical loads.

[0065] To avoid minimum necessary compression load The calculated result exceeds the material's allowable contact stress. Perform a contact stress check and provide a rollback prompt: ;

[0066] Among them, the contact stress estimate : by minimum necessary compression load Divide by effective contact area The value is obtained, and its range is non-negative; effective contact area. : Determined by valve seat geometry or type specification, the value range is positive; : The upper limit of the allowable contact stress of the material, which is a temperature-dependent parameter in the material library, and its value range is positive.

[0067] In the implementation method, when the inequality does not hold, the system displays a contact stress exceeding the limit warning on the page and reduces the stress in a more preferred-preferred-generalized order. Or adjust The hold time parameter is maintained until the constraint is met or the system rolls back to a conservative closed mode.

[0068] In application, explicit inequalities are used to protect the material boundaries to ensure the obtained inequalities. It can be withstood by actual materials; the deliverables include contact stress verification records, facilitating alignment with maintenance and repair practices. It reduces the multi-factor problem of pressure difference, geometry, materials, temperature, and holding time to a single quantity. This provides a consistent input for subsequent angle mapping and ensures that the material safety boundary is not crossed through contact stress verification.

[0069] The angular transmission geometry of actuators commonly exhibits an output characteristic that is high at both ends and low in the middle. If the minimum necessary pressure load is not considered... Transform to the angular domain and match the maximum permissible torque of the valve stem. If merged, the final stage of slow closure will lack clear hard constraints.

[0070] Therefore, it is necessary to transfer the coefficient by angle. Will Mapped to torque domain curve, and compared with Point-to-point comparisons are performed to generate an allowable torque upper limit-angle curve that can be used throughout the entire stroke. Therefore, the angle transfer coefficient is constructed first. A deterministic expression for the force-moment dimension is established; then, the strength limit is expressed by minimizing the point state. with by By merging the derived angle curves, we obtain the allowable torque upper limit - angle curve. .

[0071] To map the linear load domain to the torque domain, an angle transfer factor is constructed using the product of the lever arm and the efficiency. And obtain the mapping relationship: ;

[0072] Angular transfer coefficient Multiplying the load by this coefficient yields the valve stem torque, which is a positive number; equivalent force arm function. : Given by the linkage or cycloidal geometry of the actuator, the value range is positive;

[0073] Transmission efficiency function : Absorbs friction and clearance losses in the absorption mechanism, ranging from 0 to 1; Valve position angle variable. : with valve position variable Equivalent mapping, with values ​​ranging from zero to a quarter of a cycle.

[0074] Load conversion factor (contact-mechanism): ;

[0075] : Measured torque-displacement slope of the seat section; Local stiffness of the contact seat.

[0076] In the implementation method, the equivalent force arm function The transmission efficiency function is obtained by cubic spline interpolation of discrete points on the spectrum curve. A deterministic function is obtained by regressing the long-term trend of the valve fingerprint curve, and the product of the two functions is output with the same angular resolution.

[0077] In application, structural geometry and energy loss are embodied in a single function. In the middle, it is convenient to observe in the full angular domain. Perform consistent dimensional transformation; page-based load conversion factors. The curve is for later use.

[0078] With minimum necessary compression load Using the strength base, mapping it to the angle domain and taking the minimum value with the maximum allowable torque of the valve stem in a point state, we obtain: ;

[0079] Where: Maximum allowable torque - angle curve : This is a hard constraint for the subsequent gradual closing of the outer ring, and its value is non-negative; minimum necessary compression load. : Definition as above; Load conversion factor : Load conversion factor; Maximum permissible torque of valve stem : This is the limit for type test certificates or manufacturers, and the value range is positive.

[0080] In this implementation, the curves are sampled and output at equal angular intervals, and the endpoints are truncated at structural limiting angles; page overlay. Curves and horizontal lines And the following envelope is displayed Simultaneously, a limit twist line delivery document is generated and archived together with the minimum necessary compression load record.

[0081] In application, the torque limit of the entire angular domain is clearly defined by the deterministic curve, and the material strength and mechanism geometry are unified into an executable outer loop limiting curve. The deliverable is consistent with the next step interface to avoid secondary interpretation. The strength boundary and geometric characteristics are fused in a point state to generate an outer loop limiting curve that can directly drive the slow closure. This ensures that the next step of the restricted smooth slow closure curve has clear hard constraints in the angular domain, avoiding the alternation of overvoltage and undervoltage.

[0082] Step 3: Starting from the contact seat position, construct a smooth, gradual closing trajectory with continuous endpoint velocity and acceleration. Advance within the allowable torque upper limit-angle curve limit, stopping load increase once the minimum necessary pressure load is reached, and record the contact energy. Then, enter the fixed holding interval, completing seal verification based on pressure and valve position stability. If not satisfied, re-verify by load increment and generate a record, providing input and boundaries for the calculation of the breathing pressure holding and seat health index during the maintenance phase. A unified time reference and angle mapping are used throughout the process.

[0083] If the contact seat is pressed against the bearing at a constant speed or in a stepwise manner after contact, a load peak is likely to occur in the bearing section, leading to localized intrusion and cold flow into the bearing ring. Conversely, if the speed is reduced to near a standstill prematurely, underload may occur under high pressure differential, resulting in substandard sealing performance. Therefore, a smooth, gradual closing curve with continuously controllable speed, acceleration, and jerk in the final stage of the stroke is required, and this curve should be applied during its execution. As an outer ring hard limiter, it couples the trajectory propulsion with the upper limit of the load.

[0084] By contact position As the starting point of the trajectory, the displacement ratio and total duration of the final segment are set, and a smooth curve with zero endpoint velocity and zero endpoint acceleration is used as the reference trajectory; then, a nominal driving quantity is generated using position-velocity servo as the inner loop, and a saturation operator is used to force it not to exceed the limit. This enables restricted trajectory following. When the equivalent load reaches... When this happens, immediately freeze the trajectory to maintain it, in order to avoid unnecessary overloading.

[0085] A smooth trajectory with zero velocity and zero acceleration at the endpoints is constructed within the normalized time variable at the end of the phase to achieve a continuous transition of displacement-velocity-acceleration: ;

[0086] Among them: the final target displacement trajectory : This is the reference curve for the seating section, and its value ranges from and Between; Contact position estimation : The unique trigger point of the previous output; final displacement : Set by the operator within the generalized-preferred-more preferred range, with a value ranging from one percent to three percent of the total travel; normalized time variable at the end of the journey. Defined as The value ranges from 0 to 1.

[0087] This form is in and The first and second derivatives at the point are both zero, which suppresses mechanical impact and, simultaneously, affects the estimation of the contact position. Align on the coordinate system to ensure that the boundaries of the previous step and the current step are consistent.

[0088] In application, the smoothness of the trajectory prevents speed and acceleration spikes during seat movement; The controllable settings allow the trajectory to match the working conditions; the measurable effect is a superimposed graph of displacement-velocity-acceleration curves.

[0089] Inner ring press Generate nominal drive torque And force hard limiting of the outer loop with a saturation operator: ;

[0090] Among them, the outer ring output drive quantity : The target pressure difference corresponds to pneumatic operation, and the target current corresponds to electrodynamic operation; the value range is a finite interval; saturation operator Defined as , used to implement the upper and lower limit widths;

[0091] Nominal drive torque : Generated by position-velocity servo, with values ​​ranging from real numbers; Allowable torque upper limit - angle curve : This represents the outer ring hard constraint output from the previous step; valve position angle variable. : with valve position variable Equivalent mapping.

[0092] When nominal drive torque When the limit is reached, the inner loop integrator immediately enters anti-integral freeze mode to prevent rebound caused by integral accumulation after saturation; the pneumatic channel will drive the outer loop output. Mapped to the output chamber pressure difference target, the electric channel will drive the outer loop output. The target is mapped to current, and both are advanced on the same time base.

[0093] When applied, without altering the inner ring target trajectory, the outer ring amplitude limit ensures that the target will not be exceeded at any time. Inverse integral processing suppresses secondary impacts after saturation; the measurable effect is nominal drive-limited output- Three-curve comparison chart. The combination of deterministic smooth trajectory and outer ring hard limiting ensures that trajectory advancement and torque upper limit are coordinated within the same time base, achieving controlled final pressure without over- or under-pressure.

[0094] During the process of moving the seat, the same Energy exposure varies under different temperatures and pressure differentials. Without budgeting and managing contact energy, excessive energy may accumulate when materials are vulnerable. Meanwhile, verifying the seal's adequacy requires verifiable criteria without additional process disruption. Therefore, it is necessary to use the integral of contact energy as a budget to adjust the trajectory by slowing down or shortening it, and to confirm the seal using pressure-displacement stability criteria.

[0095] The target displacement trajectory in the final segment While maintaining limited following, the measured equivalent torque is integrated over the angular domain to accumulate contact energy. When approaching the budget limit, the maximum speed in the final stage or the displacement in the final stage is reduced or shortened according to fixed rules, thus avoiding exceeding the limit. Reduce energy exposure under these conditions. Achieve Afterwards, immediately proceed to seal confirmation and maintenance, with the fixed maintenance duration and downstream pressure stability and valve position stability forming the criteria; if not met, proceed according to load increment. Perform a limited number of retests.

[0096] Integrating the measured equivalent torque curve over the angular domain yields the final contact energy: ;

[0097] Among them, contact energy : Work done in the final angle domain, with a non-negative value range; contact angle position. Corresponding contact position Angle mapping; final angle measurement : Corresponding to the final displacement Angle mapping; measured equivalent torque curve : Conversion factor between pressure or current and load The numbers are obtained through mapping.

[0098] The energy budget limit is set in conjunction with the seat ring material type, temperature, and contact time; when in contact with energy... When approaching the budget limit, rule one is to reduce the maximum speed at the end of the phase, and rule two is to shorten the displacement at the end of the phase. The two rules are executed with a fixed priority, following the same order; after the two rules are executed, The outer ring hard limit remains unchanged.

[0099] In application, energy is used as a unified budget quantity across materials and working conditions, and the goal of minimizing damage is placed on a measurable physical quantity; the measurable effect is the superposition of the cumulative contact energy curve and the budget line.

[0100] achieve Afterwards, it enters a fixed holding range, where the single criterion is the superposition of the downstream pressure and the valve position stability: ;

[0101] Among them, the stability criterion value To maintain the weighted average rate of change within the interval, the value range is non-negative; Sealing confirmation holding time. : Set by the operation side within the procedure, the value range is positive; maintain the start time In order to achieve Timing; Downstream pressure curve : Provided by downstream pressure point; valve position variable Definitions are the same as before; Valve position change weights : The value is non-negative and is used to suppress the effects of minor mechanical rebound; stability threshold : Set constants within the procedure.

[0102] The derivative calculation employs local polynomial smoothing to suppress high-frequency noise; if the inequality holds, the page displays a confirmation of successful sealing and archives the data; if the inequality does not hold, the calculation is performed using a fixed load increment. Perform one re-verification, and at most execute one re-verification. Once the limit is exceeded, the system will roll back to a conservative closed-loop mode and output a prompt indicating that maintenance / functional checks are required.

[0103] In application, a unified single criterion is used to balance process pressure and valve position stability, avoiding conflicts between multiple criteria; the fixed increment and upper limit of the number of retests make the operation traceable; the measurable effect is a superimposed graph of criterion value-time curve and threshold line.

[0104] The chain structure of energy budgeting, trajectory scheduling, stability criteria, and limited verification enables seal confirmation and material protection to work together on the same timeline, achieving compliance verification while controlling energy exposure. The output records provide weights and initial values ​​for the next step of respiratory pressure maintenance and health index.

[0105] Step 4: During the holding phase, the breathing pressure holding cycle and amplitude are set based on the viscoelastic time constant and the energy of the last contact. The amplitude and duty cycle are constrained by the allowable torque upper limit-angle curve and the actual holding torque point state. At the same time, the contact seat drift, breaking torque, hysteresis area and energy accumulation are extracted to calculate the seat health index. This index is written back to the material-temperature correction coefficient and the holding parameters to update the minimum necessary pressing load and the basis for generating the limit torsion line for the next cycle, and to generate the holding and health records.

[0106] Under constant compression load, soft seat materials exhibit time-dependent relaxation and permanent deformation. Maintaining continuous compression accelerates cooling and increases the subsequent breaking torque; conversely, maintaining excessively low loads can lead to internal leakage during pressure differential fluctuations. Therefore, it is necessary to achieve... It generates pulses with controlled amplitude and bounded beats on the baseline, which both counteract viscoelastic relaxation and avoid touching the baseline. Hard constraints.

[0107] First, estimate the viscoelastic relaxation time constant based on the material library and historical retention curves, and then set the breathing-style pressure holding cycle accordingly; then, based on... The difference between the actual torque curve and the actual torque curve determines the amplitude margin. The minimum value between the upper limit of the material amplitude and the angle margin is taken as the pulse amplitude. Finally, the actuator is driven with a fixed duty cycle. The pneumatic channel outputs the target differential pressure waveform, and the electric channel outputs the target current waveform. Both advance on the same time reference.

[0108] To adapt the pulse timing to the viscoelastic properties of the material and the previous energy exposure level, a multiplicative scheduling of relaxation time and energy weights is adopted, and the timing determination formula is given: ;

[0109] Among them, breathing pressure-holding rhythm : The time interval between adjacent pulses, with a positive value; clock speed ratio coefficient. : is a dimensionless constant, with a value range of to Used for scaling within a specified interval; viscoelastic relaxation time constant : Obtained from the material library and the holding section curve, the value range is positive;

[0110] Energy weighting coefficient : is a dimensionless constant, with a value range of to Contact energy : The final angular domain work output from the previous sequential step, with a non-negative value; Energy budget rating. : Obtained by mapping material family to temperature, and the value range is positive.

[0111] The viscoelastic time constant is identified by fitting a closed-form solution of a standard linear solid in the holding phase, and the solution is obtained using a one-dimensional nonlinear least squares method; the energy ratio is calculated using a trapezoidal integral; the beat limit is achieved using a bilateral thresholding method to ensure that it is within the allowable range of the procedure.

[0112] When applied, the beat rate is adjusted synchronously with the material's viscoelasticity and energy exposure to prevent repeated loading with an excessively dense beat rate after high energy exposure; the beat rate is a fixed value, which is convenient for comparison with the team's operation card; the measurable effect is a beat-time curve superimposed on a set interval graph.

[0113] To ensure that no angle position exceeds the hard constraint, the minimum of the available margin at the angle point and the upper limit of the material amplitude is taken to obtain the amplitude determination formula: ;

[0114] Among them, the amplitude of the respiratory pressure holding pulse Torque domain or equivalent torque domain, mapped to pressure difference amplitude for aerodynamics and current amplitude for electrodynamics, with a non-negative value range; amplitude margin coefficient. : is a dimensionless constant, with a value range of to Allowable torque limit - angle curve : This is the output of the previous sequential step, and its value range is non-negative;

[0115] Actual holding torque curve To achieve The torque recorded during the holding phase is non-negative. : Upper limit of material amplitude, which is a temperature-material mapping function, and its value range is non-negative; Valve position angle variable. : with valve position variable Equivalent mapping; duty cycle uses a dimensionless parameter , is the ratio of pulse width to beat, and its value ranges from 0 to 1. to During execution, the boundary saturator is called to ensure... and Within the allowable range.

[0116] In application, the amplitude is constrained by both the angle margin and the material limit to prevent exceeding limits in the angle end region or high-temperature conditions; the duty cycle limits the loading percentage per unit time, reducing the cumulative energy input; the measurable effect is the pulse waveform and... - Difference overlay plot.

[0117] During the maintenance phase, a unified quantitative indicator is needed to reflect the health status of the seat ring material, and based on this, the adjustment range of pulse beat, amplitude, and subsequent model parameters should be determined. At the same time, the operation and maintenance system needs to align the health status with the industry-standard four-state diagnostic semantics to facilitate scheduling maintenance and generating work orders.

[0118] Using contact position drift, contact energy accumulation, torque ramp-up, and hysteresis area change as core features, a percentage-based health index is constructed. Then, the health index is mapped to diagnostic semantics of needing maintenance, functional inspection, exceeding specifications, and fault according to a fixed threshold. Finally, the health index is used as a weight to write back the material-operating condition factor and breathing pressure holding parameters, so that the cycle time and amplitude of the next cycle are closer to the material state.

[0119] To ensure that the health index is bounded and monotonic within a percentage range, a logistic function is used as a bounded mapping, and features are integrated using linear combinations to give a deterministic formula: ;

[0120] Among them, the seat health index The range of values ​​is within to Logical functions Defined as Ensure output is to ; Fusion weights The value range is a real number, and it is adjusted before going online according to the material family and the importance of the device; contact position drift amount. : This represents the reference difference between the current contact position and the non-contact travel reference curve, and its value range is a real number;

[0121] Contact position drift reference value : Baseline constant at the time of connection, with a positive value range; cumulative contact energy. : The sum of energy integrals over multiple cycles, with a non-negative range; Energy budget rating. Definition as above; breaking torque : This represents the initial peak torque at each start-up, and its value is non-negative; it breaks the torque baseline value. : Baseline constant at the time of going online, with a positive value range; hysteresis area : The work-displacement loop area for one reciprocating stroke, with a non-negative value; hysteresis area reference value. : This is the baseline constant at the time of going online, and its value range is positive.

[0122] In implementation, feature quantities are extracted from valve fingerprint curves using a unified timestamp, integrals are obtained using trapezoidal integrals, derivatives are obtained using local polynomial smoothing, and weights are obtained by offline least squares or bounded constraint fitting.

[0123] When applied, the health index is output as a percentage, which is easy to interpret directly in the operation and maintenance interface; multi-feature fusion avoids misjudgment caused by a single indicator; the measurable effect is a superimposed graph of health index-time curve and threshold band, and the measurement conditions are fixed sampling rate, consistent feature extraction algorithm, and no weight drift during operation.

[0124] To utilize the health index for parameter scheduling in the next cycle, and to align with industry-wide four-state diagnostics, a deterministic health-parameter linear writeback formula is adopted, and explicit rules for threshold mapping are provided: ;

[0125] in, The rewritten material-temperature correction factor is used for the minimum necessary press load calculation in the next cycle, and its value is a positive number. : Current material-temperature-holding time correction factor, which is the factor used in the previous sequential step, and its value range is positive; write-back gain coefficient : is a dimensionless constant, with a value range of to Seat health index : The definition is the same as before.

[0126] Threshold mapping rule: When the seat health index When, the diagnosis indicates maintenance is required (not triggered); when When, the diagnosis indicates that maintenance is required; when At that time, the diagnosis was a functional test; when When the diagnosis is found to be outside the norm, the conservative closure mode is activated.

[0127] Meanwhile, the breathing pressure holding duty cycle With rhythm by Even with linear shrinkage of the weights, the upper limit of the amplitude is still affected. constraint.

[0128] During implementation, the parameter version number is archived to ensure traceability; threshold judgment is performed using a state machine, and the output is aligned with the alarm code of the control system; the solver is a combination of a rule engine and a one-dimensional linear transformer.

[0129] In application, diagnostics and parameters are linked on the same timeline, avoiding the disconnect of alarms only providing notifications without taking action; the write-back amplitude changes with the health index in a bounded manner to prevent over-adjustment; the measurable effect is a superimposed graph of the health index and parameter write-back coefficients over time. The pipeline structure of health index - four-state diagnostics - parameter write-back integrates maintenance strategies, material factors, and operating condition responses, ensuring that subsequent on / off and maintenance are self-consistent under the same semantics and dimensions.

[0130] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0131] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0132] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0133] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0134] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for intelligent adaptive control of a soft-seal frictionless ball valve, characterized in that: include, In the final stroke near the valve seat, a limited perturbation is superimposed. Based on the stiffness change of the load-displacement curve and the residual change point of the non-contact stroke reference curve, the instantaneous contact position and local stiffness are determined. Collect information on the pressure difference across the valve, valve body temperature, and seat ring material; calculate the minimum necessary pressure load to satisfy zero visible leakage; and generate an upper limit of allowable torque versus angle curve that varies with the angle according to the mechanism's transmission geometry, taking the minimum value of the maximum allowable torque of the valve stem. Starting from the contact seat position, a smooth, slow-closing trajectory with continuous speed is generated. It advances within the limit of the allowable torque upper limit-angle curve, stops increasing the load when the minimum necessary pressure load is reached, records the contact energy, and performs a seal confirmation based on pressure and valve position stability. During the holding phase, the breathing pressure holding cycle and amplitude are set according to the viscoelastic time constant and contact energy, and are constrained by the allowable torque upper limit-angle curve; Extracting contact seat drift, breaking torque and energy accumulation to form a seat health index, and writing it back to the material-temperature correction factor; The perturbation is a micro-pulse of the differential pressure in the output chamber or a micro-step of the motor current, and its amplitude is constrained by the maximum allowable torque of the valve stem and the actuator parameters. A baseline is established using a non-contact travel reference curve. The contact seat position and local stiffness are determined based on the first exceedance of the fusion criterion threshold. The backrest section window is a preset interval for the end of the entire travel. The fusion criterion is composed of equivalent stiffness and normalized weighted cumulative residuals. A judgment sequence is formed by synchronously collecting data with a unified timestamp. Perform structural coordination verification before entering the seating area; For valve bodies with retractable valve seats or lifting and tilting mechanisms, a pre-disengagement segment is first executed. The slope of the non-contact stroke reference curve decreases as the retraction criterion. Then, the contact seat confirmation and output are completed according to the perturbation and fusion criterion process. After the pre-disengagement segment is completed, the seat section window is aligned with the same valve position calibration coordinates, and the sampling frequency is kept consistent to complete the data handover. The minimum necessary pressure load is obtained by multiplying the pressure difference and the base of the valve port pressure area with the working condition safety factor function and the material-temperature-holding time viscoelastic factor. The minimum necessary pressure load is then checked with the effective contact area and the allowable contact stress of the material. If the limit is exceeded, the parameters are converged in a predetermined order or the conservative closure is switched. The working condition safety factor function is a monotonically non-decreasing piecewise function, and the viscoelastic factor is read by matching the material library table entries with the holding time. Based on the actuator type profile and interpolation of survey points, the equivalent force arm is obtained; based on valve fingerprint regression, the transmission efficiency is obtained and the angle transmission coefficient is constructed. The minimum necessary press load is mapped to the torque domain curve using the angle transmission coefficient, and the maximum allowable torque of the valve stem is taken to generate the upper limit of allowable torque-angle curve by taking the minimum value at each angle. The equivalent force arm is monotonic interpolation, and the transmission efficiency is bounded regression using the historical fingerprint curve. Both are output with the same angle resolution.

2. The intelligent adaptive control method for a soft-seal frictionless ball valve according to claim 1, characterized in that: A smooth, gradually closing trajectory with zero endpoint velocity and acceleration is adopted. The nominal drive is generated by position-velocity servo and constrained by the allowable torque upper limit-angle curve through a limiting operator. When the limit is reached, inverse integration freeze is performed. The contact energy is recorded by integrating the measured equivalent torque in the angle domain. The starting point of the trajectory is taken as the contact seat position and the propulsion range is limited by the displacement of the last segment. After reaching the minimum necessary pressing load, it switches to holding.

3. The intelligent adaptive control method for a soft-seal frictionless ball valve according to claim 2, characterized in that: After reaching the minimum necessary compression load, the downstream pressure and valve position curves are obtained for a fixed holding time, and the seal is confirmed using a weighted stability criterion. If the condition is not met, a limited number of retests are performed according to the predetermined load increment, and the retest strategy parameters are recorded. The maximum number of retests is the upper limit parameter. If the upper limit is exceeded, the conservative closure mode is switched, and each retest is recalculated within the same holding range and a retest record is generated.

4. The intelligent adaptive control method for a soft-seal frictionless ball valve according to claim 3, characterized in that: Based on the viscoelastic time constant and the ratio of contact energy to rated energy, the breathing pressure holding cycle is determined. The amplitude is obtained by taking the minimum value of the difference between the allowable torque upper limit-angle curve and the actual holding torque, as well as the material amplitude upper limit, according to the angular position, and the duty cycle is limited. Both the amplitude and the duty cycle are constrained by the allowable torque upper limit-angle curve and are executed with a unified time reference in the pneumatic or electric channel.

5. The intelligent adaptive control method for a soft-seal frictionless ball valve according to claim 4, characterized in that: The seat health index is composed of a percentage system based on contact seat drift, accumulated contact energy, breaking torque, and hysteresis area. The health index is generated using a bounded mapping. The health index is mapped to a four-state diagnostic status based on a preset threshold range, and archived on a time axis according to the cycle. The four-state diagnostic status includes four categories: maintenance required, functional check, exceeding specifications, and fault. The threshold range is the online parameter, and it is called by a unified variable name throughout the cycle for invocation.

6. The intelligent adaptive control method for a soft-seal frictionless ball valve according to claim 5, characterized in that: The seat health index is used as a weight to write back the material-temperature correction coefficient, and the breathing pressure holding rhythm, amplitude and duty cycle are adjusted simultaneously. All write-back parameters and load limit delivery documents are archived with version numbers. Subsequent calls to the latest version of parameter sets and curves will generate parameter version numbers after write-back and lock them as the currently effective configuration. The configuration will be automatically referenced in the next calculation of minimum necessary compression load and restricted slow closure trajectory.

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