64results about How to "Strong field operability" patented technology

The invention discloses a method for removing heavy metal ions in sewage by nanometer hydroxylapatite, belonging to the technical field of heavy metal sewage treatment. The method comprises the following steps: adding nanometer grade hydroxylapatite powder in waste water containing heavy metal ions, wherein, the dosage of the hydroxylapatite powder is 6-8g / L; balancing the mixture for 12-48 hours at a temperature of 23-27 DEG C; and standing the mixture to remove the heavy metal ions in the waste water. The method uses the hydroxylapatite with relatively lower economic value to treat the heavy metal sewage, has high treatment efficiency, low treatment cost, strong field operability and small environment risk, and has heavy metal ion removal rate over 90 percent under conditions that concentration of Cd, Pb or Cu ions does not exceed 60mg / L.

The invention belongs to the technical field of evaluation for gas storages of gas fields, and particularly relates to an evaluating method for a closure property of a lithologic gas reservoir type gas storage. The evaluating method comprises the steps that evaluation of the closure property of a cover plate and a bottom plate is performed, specifically, the macroscopic closure property of the cover plate and the bottom plate is evaluated firstly, and then the microscopic closure property of the cover plate and the bottom plate is evaluated; the evaluation of the closure property of a lateralboundary is performed, specifically, the microscopic closure property of the lateral boundary is evaluated firstly, then a spatial form of the lateral boundary is evaluated, and finally dynamic evaluation of the lateral boundary is performed; and the overall sealing capability of the gas storage is inspected. According to the evaluating method for the closure property of the lithologic gas reservoir type gas storage, the problem that no systematic evaluating method for the sealing capability of the lithologic gas reservoir type gas storage is obtained in the prior art is solved; and the evaluating method is scientific, reliable, and highly operable on site, the sealing property of the gas storage is more accurately judged, the problem that the closure property of the lithologic gas reservoir type gas storage is difficult to demonstrate due to the trapped boundary is solved, the construction risk and the operational risk of the gas storage are reduced, and the safety of the gas storageis improved.

Disclosed is a method for testing the cavity mechanical completeness integrity of the salt cavity air library. The method comprises steps of: laying down a suite of pressure testing pipe column, employing nitrogen or air as pressure testing media to test pressure in the salt cavity; measuring the variation value of the air-water interface depth during testing time, obtaining the readings of each well head meters in the testing time via ground detecting meter, and calculating the variation trend of the cavity leakage rate versus time; combining the variation of cavity air-water interface depth and the variation trend of the air leakage rate versus time to evaluate the cavity's mechanical completeness integrity.

The invention relates to a transformer winding deformation fault diagnosis method based on frequency sweep short circuit characteristics. The transformer winding deformation fault diagnosis method comprises the following steps: 1) measuring frequency sweep short circuit impedance data of a transformer three-phase winding through a testing device under the power failure state of a transformer; 2) obtaining three diversity factor curves of the frequency sweep short circuit impedance data of the three-phase winding measured in step 1); 3) comparing three diversity factor curves DAB, DBC and DCA calculated from step 2) with standard diversity factor curves, diagnosing that the winding has slightly deformation when any one diversity factor curve exceeds attention value curves of the standard diversity factor curves; otherwise diagnosing that the winding has no deformation; and if the diversity factor curves exceed alarm value curves of the standard diversity factor curves, diagnosing that the winding has obvious deformation. The transformer winding deformation fault diagnosis method is accurate and sensitive to diagnose, easy to implement, and strong in field maneuverability and can be widely applied to fault diagnosis of transformer winding.

The hot forging process of high temperature large alloy turbine disc includes the following steps: 1) conventional upsetting and drawing to form cylindrical alloy blank of 730 mm diameter with electroslag ingot of 900 mm diameter; 2) low temperature heating the blank at 900 deg.c, coating the sides with diathermic cotton, further heating to stipulated temperature and maintaining for prolonged 5 hr; 3) upsetting the blank to intermediate blank of 1700 mm diameter through the first traditional process to machining limit of the press and then local deforming with rectangular upper anvil of width below 400 mm; 4) coating the lower surface of the circular cake blank and heating in furnace for 2 hr; and 5) final rotary forging for local deformation with upper anvil of width of 200 mm and rotating angle of 15 deg to forge the intermediate blank of 1700 mm diameter into finished product of 2000 mm diameter in the reducing amount of 25 mm and deformation amount of 35 %.

The invention discloses an oil well dual crosslinking selective plugging agent, and solves the problems that the selectivity of selective plugging agents in the prior art is not high, and effective plugging of a water layer and complete unblocking of an oil layer cannot be achieved. The oil well dual crosslinking selective plugging agent comprises the following components by mass: 2% of dispersing agent calcium lignosulfonate, 0.6% of suspending agent polyacrylamide, 0.9% of a cross-linking agent, 8% of oil soluble resin, and balance of water; wherein the 0.9% of crosslinking agent comprises 0.4% of reductant thiourea and 0.5% of oxidizing agent potassium dichromate. Compared with general plugging agents, water phase plugging rate and oil phase recovery rate of the oil well dual crosslinking selective plugging agent are higher, and the selective water plugging performance of the oil well dual crosslinking selective plugging agent is more superior.

The invention discloses supramolecular polymer clean fracturing fluid resistant to high temperature of 170 DEG C. The fracturing fluid is prepared from the following components in percentage by weight: 0.2 to 0.5 percent of thickening agent for the clean fracturing fluid, 0.1 to 0.5 percent of viscosity synergist, 0.2 to 0.4 percent of structural intensifier, 0.05 to 0.2 percent of deoxidant, 0.1 to 0.3 percent of metal ion chelating agent, 1 to 2 percent of clay stabilizer and the balance of fresh water. According to the clean fracturing fluid, a reversible supramolecular network structure is formed through the intermolecular interaction, and the thickening agent is low in use concentration and can be used for effectively controlling the viscosity of a base solution of the fracturing fluid and improving the pumping performance of the fluid; viscoelastic sand-carrying of the fracturing fluid is realized by low viscosity and high viscoelasticity; the temperature resistance can reach 170 DEG C under a long-term shear condition; the shear resistance is excellent, and the fluid viscosity and the structure after high shear can be effectively recovered; the construction friction is low, and the equipment load and the fracturing construction risk are reduced; the residue content is low, so that the damages to a reservoir stratum and prop fractures are greatly reduced, and the fracturing stimulation effect is greatly improved.

The invention provides a pipeline leakage detection method and device and relates to the field of pipeline leakage monitoring. The pipeline leakage detection method comprises the steps of obtaining anegative pressure wave signal caused by pipeline leakage; preprocessing the negative pressure wave signal to obtain the dynamic change sequence of pressure along a pipeline; determining the interval of a leakage point on the basis of the dynamic change sequence of pressure along the pipeline; and obtaining the position of the leakage point on the basis of dynamic change sequences of pressure at the two ends of the interval of the leakage point. According to the method and the device, the pipeline is detected in a segmented manner by multiple sensors arranged in the pipeline so as to determinethe interval of the leakage point, then the leakage point is positioned on the basis of the interval of the leakage point, the positioning precision is high, the site operability is high, and the method and the device can be widely applied to leakage detection of long oil and gas transmission pipelines and city water supply and heat supply pipelines.

The present invention relates to coal burning boiler in thermal power plant, and is especially judgment method for high temperature corrosion degree of boiler water cooling wall in large power station. The present invention features that the judgment includes first determining the main factors of affecting the high temperature corrosion of water cooling wall; then determining measuring conditions and relevant measuring parameters; and final rating to high temperature corrosion trend of water cooling wall via grey clustering procedure. The present invention makes it possible to grasp high temperature corrosion degree of boiler at all time for taking measures timely and to select apparatus reforming scheme with optimal performance / cost ratio.

The invention relates to a transformer winding and iron core fault diagnosis method based on a vibration characteristic. The methods comprises the steps that the time domain sequences of an original vibration signal and a to-be-detected vibration signal are collected; the time domain sequences are respectively transformed into respective frequency domain sequences; the frequency domain sequences of an original iron core vibration signal, an original winding vibration signal, a to-be-detected iron core vibration signal and a to-be-detected winding vibration signal are determined; data processing are carried out on the frequency domain sequences of the original iron core vibration signal, the original winding vib ration signal, the to-be-detected iron core vibration signal and the to-be-detected winding vibration signal; and fault diagnosis is carried out according to the data processing result. The method provided by the invention realizes the separation of iron core and winding vibration signals, can effectively reflect the vibration states of a winding and an iron core of a transformer, and has the advantages of accurate monitoring result and strong practicality.

The invention provides high-temperature-resistant ground cross-linked acid liquor. The acid liquor comprises the following components in percentage by mass: 15-28 weight percent of acid, 0.4-1.0 weight percent of polyacrylamide polymer, 0.1-0.5 weight percent of aldehyde cross-linking agent, 0.05-0.25 weight percent of phenol cross-linking agent, 0.05-0.02 weight percent of crosslinking promoter, 0.5-2.0 weight percent of corrosion inhibitor, 0.5-2.0 weight percent of ferric ion stabilizer, 0.01-0.1 weight percent of ammonium persulfate and the balance of water, wherein the acid is calculated based on pure substances. The invention also provides a method for preparing the high-temperature-resistant ground cross-linked acid liquor. Industrial raw materials which are low in toxicity and low in price are taken as cross-linking agents and cross-linking promoter, the toxicity of the cross-linking agents can be reduced, the process for preparing the high-temperature-resistant ground cross-linked acid liquor is simple, further synthesis is not needed, the field operability is high, the cost is effectively reduced, and application of acid fracturing is further widened.

The invention discloses a high-frequency variable displacement volume fracturing method for an atmospheric pressure shale gas reservoir. The method comprises the steps of (1) evaluation of shale key reservoir parameters, (2) optimization of crack parameters, (3) determination of geological engineering filling points and determination of cluster perforation positions, (4) optimization of fracturingconstruction parameters, (5) cluster perforation operation, (6) acid pretreatment operation, (7) injection construction of acid slick water for making main cracks, (8) neutral slick water high-displacement injection construction (9) 140-230 mesh or 70-140 mesh proppant middle-displacement injection construction (10) low-displacement injection construction of sealing liquid; (11) repeating of thesteps (8)-(10) until the total liquid amount and the proppant of a current section are used up; and (12) displacement operation. According to the invention, an acidic slick water system and a neutralslick water high-frequency variable displacement process are adopted. The production effect of the atmospheric pressure shale gas well after fracturing is improved, and the aim of economically and effectively developing the atmospheric pressure shale is better achieved.

Disclosed is a multi-rope friction lifter load identification method based on vibration analysis. According to the method, an acceleration sensor is arranged on a main shaft of a lifter to collect a vibration signal, and the signal is captured to serve as a time-domain signal to be processed; the signal to be analyzed is decomposed into a limited number of intrinsic mode functions by means of the empirical mode decomposing method, false and margin components are eliminated, and an effective IMF set is extracted; energy feature information of the signal is extracted by means of an effective IMF component, the energy, energy variance contribution rate and energy moment of the IMF component are selected to serve as feature values to construct a feature vector and a high-dimensional sample space thereof, the nonlinear mapping relation between a sample and a target is built by means of the vector regression algorithm with total lifting weight and load difference as the estimation target, and then the load value is calculated. The multi-rope friction lifter load identification method based on the vibration analysis is high in stability and estimation accuracy, used for obtaining the real-time lifting load of the lifter to further monitor the lifting load in real time, and capable of avoiding lifting failures caused by overloading, rope clamping, rope loosening and the like.

A technology for manufacturing large-size (300 mm in diameter) raw intermediate Ti-alloy rod incldues such steps as cleaning surface of Ti-alloy ingot, unidirectionally coating high-temp water glass, drying in air, heating to 1150-1200 deg.C, forging reduction and forging longer.

The invention relates to a transformer on-load tap-changer fault diagnosis method based on vibration characteristics. The transformer on-load tap-changer fault diagnosis method comprises steps of detecting original off-line vibration data; detecting original electrification vibration data; obtaining an original off-line vibration energy curve; calculating original off-line vibration characteristic parameters; obtaining an original electrification vibration energy curve, calculating original electrification vibration characteristic parameters; detecting electrification vibration data to be diagnosed; obtaining an electrification vibration energy curve to be diagnosed; calculating electrification vibration characteristic parameters to be diagnosed; calculating a correlation coefficient A of the electrification vibration energy curve to be diagnosed and the original electrification vibration energy curve and a range difference (B and C) of the electrification vibration characteristic parameters to be diagnosed and the original electrification vibration characteristic parameters; judging whether faults exist through the correlation coefficient A and the range difference (B and C); detecting off-line vibration data to be diagnosed; calculating an off-line vibration energy curve to be diagnosed; calculating off-line vibration characteristic parameters to be diagnosed; calculating a correlation coefficient A of the off-line vibration energy curve to be diagnosed and the original off-line vibration energy curve and a range difference (E and F) of the off-line vibration characteristic parameters to be diagnosed and the original off-line vibration characteristic parameters; and judging whether faults exist through the correlation coefficient D and the range difference (E and F).

The invention discloses a steam-flooding well network structure for an extra-heavy oil reservoir and an oil extraction method. The well network structure comprises a herringbone horizontal well, at least one straight well and layered steam injection mechanisms. The herringbone horizontal well comprises a vertical section, a horizontal section communicating with the lower end of the vertical section and located on the lower portion of an interlayer, and a plurality of branch sections; one ends of the branch sections communicate with the horizontal section, and the other end of at least one of the branch sections is located above the interlayer; sectioned plugging devices are arranged in the positions, in the interlayer, of the branch sections; the herringbone horizontal well serves as an oil extraction well; the straight wells are arranged close to the horizontal section, serve as steam injection wells and are provided with at least two perforations located on the upper portion and thelower portion of the interlayer correspondingly; and the layered steam injection mechanisms are arranged in the straight wells and enable the perforations to be opened in a perforated mode. Accordingto the steam-flooding well network structure for the extra-heavy oil reservoir and the oil extraction method, the influence of formation heterogeneity on the production effect is avoided, the oil extraction speed and the crude oil recovery ratio are increased, and comprehensive benefits of heavy oil extraction are improved further.

The invention discloses a composite lightening material which comprises the following components in parts by weight: 100 parts of coal ash, 10-15 parts of expanding materials and 5-10 parts of toughening materials, wherein the particle size range of the coal ash is 5-10 microns. The invention also relates to a preparation method of the composite lightening material, and the preparation method comprises the following steps: i) carrying out smashing and ball milling on the coal ash through an overhang roll mill, classifying the smashed and ball-milled coal ash through a classifier, and collecting the coal ash with the particle size range of 5-10 microns after the classification to obtain modified coal ash; and ii) mixing the modified coal ash obtained in the step i) with the expanding materials and the toughening materials according to the proportion so as to obtain the composite lightening material. Meanwhile, the invention also discloses deep well composite cement paste and an application of the composite cement paste in well cementing of oil / gas wells.

The invention provides a construction device and method of a double-curved-surface arch-shaped concrete wall, and relates to the field of double-curved-surface arch-shaped wall construction. The construction device of the double-curved-surface arch-shaped concrete wall comprises a plurality of arc-shaped steel supports arranged along a horizontal arc line at intervals, a plurality of inner side transverse wooden edges arranged at intervals are fixedly connected to the outer side surfaces of the arc-shaped steel supports, layers of inner side longitudinal wooden edges are fixedly connected to the outer side surfaces of the inner side transverse wooden edges, the outer side surfaces of the inner side longitudinal wooden edges are laid with layers of inner formworks, wall steel bars are bond to the outer side surfaces of the layers of inner formworks, the outer side surfaces of the wall steel bars are laid with layers of outer formworks, and concrete linings are arranged between the inner formworks and the outer formworks. A plurality of outer side longitudinal wooden edges arranged at intervals are arranged along the outer side surfaces of the outer formworks, the outer side surfaces of the outer side longitudinal wooden edges are laid with layers of outer side transverse wooden edges, and concrete is poured between the inner formworks and the outer formworks to obtain the double-curved-surface arch-shaped concrete wall. According to the construction device of the double-curved-surface arch-shaped concrete wall, safe, economic and efficient construction of a double-curved-surface arch-shaped wall structure can be realized.

The invention discloses a method for improving thick oil recovery ratio. The method comprises the followings steps of: first, injecting 5 to 10 mass percent crude oil extracting agent aqueous solution; then, injecting 10 to 50 m<3> of 40 to 50 mass percent urea aqueous solution; and finally, injecting steam, and simultaneously injecting an crude oil extracting agent dropwise in the process of injecting the 20 to 80 percent of steam or injecting an oil deposit protective agent accomplished with the injection of the crude oil extracting agent each time. By utilizing the characteristics of the crude oil extracting agent, the crude oil extracting agent can search thick oil automatically; because the composition particles of the crude oil extracting agent are close to nano-scale, the functionsof compatibilization and catalysis of the thick oil are derived; and the crude oil extracting agent can rapidly search the thick oil and oil dirt, adsorb on the surfaces of the thick oil and the oil dirt, penetrate and decompose the thick oil and the oil dirt so as to be brought out of the stratum.

The invention relates to a composite gel well killing rubber plug capable of rapidly gelatinizing and weighting at high temperature and a preparation method thereof. The problem that a common temporary plugging agent cannot effectively balance the formation pressure due to too small density in the drilling and completion process of the high-temperature and high-pressure oil and gas reservoir is solved; and the cementing time can be controlled within 2-24 hours, the final setting strength can reach the visual inspection code I level, dehydration and shrinkage are avoided within 90 days, and theplugging requirement of an oil reservoir at the temperature of 90-150 DEG C can be met. According to the invention, the flexibilizer and the copolymer are mixed and intercalated; the strength of a rubber plug system is effectively improved in the aspect of chemical gelling, the density of the rubber plug system is improved by adding the weighting agent, the physical performance of the rubber plugsystem is improved on the chemical basis, and the temporary plugging agent is convenient to prepare on site, high in operability and wide in application prospect in the field of safety risk control of downhole operation such as high-temperature and high-pressure drilling and completion and well repair.

The invention relates to a detection method and a detection device for conversion ratio of a nitrogen oxide detector of a diesel vehicle. The detection method comprises the following steps: first, introducing NO2 gas of constant concentration into a conversion device; then acquiring an indicating value of concentration of a nitrogen and oxygen channel to calculate the conversion ratio; and correcting the conversion ratio by means of the indicating value of concentration of the nitrogen and oxygen channel by pre-introducing NO gas of constant temperature into an analyzing platform. The detection device comprises a gas source, a gas circuit switching module, a flow monitoring module and upper computer control software. The gas source is connected to the gas inlet end of the gas circuit switching module, the gas outlet end of the gas circuit switching module is connected to the air inlet of the flow monitoring module, and the gas outlet end of the flow monitoring module is connected to the gas inlet end of the nitrogen oxide detector of the diesel vehicle. The detection method and the detection device provided by the invention have good field operability and traceability, so that influence of measuring errors caused by the analyzing platform is solved effectively and the accuracy of a conversion ratio detection result is guaranteed.

The invention belongs to the fields of a power transmission line and a power cable, and particularly relates to a crimping type cable conductor connector with a current sharing effect and a preparation method. Each layered insulating conductor consists of a first cylinder positioned in the centre of the conductor, and a second cylinder and a third cylinder with hollow-out central parts and arranged outside the first cylinder in a sleeving manner; the layered insulating conductor is inserted into a hollow conductor connecting pipe from the two ends of the conductor connecting pipe; in a crimping process, a crimping die surrounds the upper and lower sides of a crimping section of the conductor connecting pipe; and the cable conductor connector is extruded by die closing of the crimping die,and the conductor connecting pipe and the layered insulating conductor are subjected to micro deformation. By virtue of the crimping type cable conductor connector, the alternating current resistanceof the large-section cable conductor with the layered insulating structure in the conductor connector position can be lowered, so that the problem of temperature rise in the conductor and the connector positions when the large-section layered insulating conductor is applied can be overcome.

The invention provides an on-load tap-changer switching program online detection and diagnosis method. The method comprises the following steps that original online vibration data is detected and acquired; an enveloping curve of the original online vibration data is calculated and is defined as an original fingerprint of on-load tap-changer vibration; an original fingerprint switching program feature vector X is calculated; to-be-diagnosed online vibration data is detected and acquired; an enveloping curve of the to-be-diagnosed online vibration data is calculated and is defined as a to-be-diagnosed fingerprint of on-load tap-changer vibration; a to-be-diagnosed fingerprint switching program feature vector X is calculated; correlation coefficients A are calculated; according to the correlation coefficients A and diagnosis criteria, it is judged whether an on-load tap-changer switching program is abnormal or not. By adopting the on-load tap-changer switching program online detection anddiagnosis method, the online detection purpose is achieved.

The invention relates to a high-speed electrified rail traction power supply line protective belt load test method which comprises the analysis of phase relations between voltages and currents of a high-speed rail traction line in different running states and the design of traction line protective belt load calibration methods, and analyzes the phase relations between the voltages and the currents of the high-speed rail traction line under the conditions of locomotive normal load running, electric locomotive regenerative braking and electric locomotive switching in rush currents. Three traction line protective belt load calibration methods and implementation steps are designed by utilizing the voltage and current characteristics of the traction line according to different test conditions, wherein the three traction line protective belt load calibration methods comprise judgment by utilizing the electric locomotive running state in a power supply section, comprehensive judgment by utilizing a bus protection device sampling value, and judgment by utilizing the locomotive switching in rush currents. The three methods all have strong field operability and can be selected according to supplied test conditions at the time of a field test.

The invention relates to a transformer winding deformation fault diagnosis method based on frequency sweep short circuit characteristics. The transformer winding deformation fault diagnosis method comprises the following steps: 1) measuring frequency sweep short circuit impedance data of a transformer three-phase winding through a testing device under the power failure state of a transformer; 2) obtaining three diversity factor curves of the frequency sweep short circuit impedance data of the three-phase winding measured in step 1); 3) comparing three diversity factor curves DAB, DBC and DCA calculated from step 2) with standard diversity factor curves, diagnosing that the winding has slightly deformation when any one diversity factor curve exceeds attention value curves of the standard diversity factor curves; otherwise diagnosing that the winding has no deformation; and if the diversity factor curves exceed alarm value curves of the standard diversity factor curves, diagnosing that the winding has obvious deformation. The transformer winding deformation fault diagnosis method is accurate and sensitive to diagnose, easy to implement, and strong in field maneuverability and can be widely applied to fault diagnosis of transformer winding.

The invention discloses a material and a construction method for the ocean engineering rubble throwing foundation grouting consolidation. The grouting material comprises a gel material, cellulose, a high-performance water reducing agent, a flocculating agent, an inert powder, calcium chloride, starch glue, seaweed gel, a microbial composite inoculant, and calcium carbonate. The grouting construction method comprises the following steps: current situation investigation, field formula test, measurement and positioning, drilling, hole-cleaning, slurry preparation, upward grouting from the bottomof a hole to a designed position, and hole-sealing. The grouting material provided by the invention can effectively solve the problem of underwater grouting, can work with water, and avoids the problem that the common slurry is dispersed when meeting water or is washed away by water flow, and the like.

A technology for manufacturing large-size (300 mm in diameter) raw intermediate Ti-alloy rod incldues such steps as cleaning surface of Ti-alloy ingot, unidirectionally coating high-temp water glass, drying in air, heating to 1150-1200 deg.C, forging reduction and forging longer.

The invention discloses a deep low-damage acidizing fluid which solves the problem that the existing acidizing fluid has a great damage to formation. The acidizing fluid comprises the following components by taking the total weight of the acidizing fluid as a reference: 5-7% of DH, 2-5% of fluoboric acid, 3% of dodecyl trimethyl ammonium chloride, 3-6% of HCl, 1% of corrosion inhibitor, 1.5% of anti-swelling agent, 1% of demulsifying agent, and the balance of water. The acidizing fluid keeps the strength of acid, and has a certain retardance action, so that acid has a low pH value and longer reaction time in a reaction system, an action distance is increased, an acidizing effect is more obvious, and the damage to the formation is reduced effectively.

The invention discloses a negative-pressure vacuumizing pouring method for a high-pressure regulating valve casting. The method includes the following steps that S1, a sand mold is closed and put intoa tool which is a box body with an opening formed in the upper end, an air suction cavity is formed in the lower end of the box body, and the air suction cavity is separated from the box body througha filter screen; S2, the space between the box body and the sand mold is filled with dry sand; S3, after the spaced is full of the dry sand, plastic is laid at the upper end of the box body, and thedry sand is laid on the plastic; S4, a vacuum pump is started, and the air suction cavity is vacuumized; S5, pouring is conducted in the sand mold, and the vacuum pump is kept to be started; and S6, after pouring is completed, the vacuum pump is stopped. According to the method, the pouring speed is increased, the mold filling time of the high-pressure thick-wall casting is shortened, the qualityof the casting is further improved, particularly, the shrinkage crack defects of the chromium-molybdenum steel shot casting of the high-pressure regulating valve are overcome, and the problem of structure segregation of the high-pressure thick-wall valve body casting is effectively solved.