Research on the Best Autofrettage Pressure of Ultra-High Pressure Valve Body

2015 ◽  
Vol 667 ◽  
pp. 524-529
Author(s):  
Xiu Hua Ma
Keyword(s):  
High Pressure ◽  
Simulation Analysis ◽  
Equivalent Stress ◽  
Maximum Pressure ◽  
Working Pressure ◽  
Valve Body ◽  
Ultra High Pressure ◽  
Pressure Discharge ◽  
Maximum Equivalent Stress ◽  
Autofrettage Pressure

This paper takes the ultra-high pressure (103.5MPa) valve body as the research object and adopts the finite element method to perform simulation analysis on the three bearing conditions involved with the valve body, i.e., autofrettage pressure, discharge and working pressure. The simulation shows identical results with the theoretical calculation. The relationship between the maximum equivalent stress and autofrettage pressure during the operation of the valve is obtained from the simulation results; therefore the best autofrettage pressure is determined. When determining the maximum value of autofrettage pressure, the maximum pressure, at which reverse yield does not happen, and the complete yield pressure shall be taken into consideration, with the smaller value of the two taken after comparison and analysis. When the size of the valve body is fixed at certain value, the best autofrettage pressure is not a fixed value, but it varies with the change of working pressure.

Numerical Simulation Analysis of Centrifugal Pump Floating Ring Seal

2011 ◽  
Vol 317-319 ◽  
pp. 2148-2151
Author(s):  
Jian Yong Han ◽  
Guo Jing Chen
Keyword(s):  
Numerical Simulation ◽  
High Pressure ◽  
Centrifugal Pump ◽  
Simulation Analysis ◽  
Maximum Pressure ◽  
Force Analysis ◽  
Sealing Ring ◽  
Fluent Software ◽  
Ring Seal ◽  
Liquid Flows

According to the studying on the force analysis of floating ring of centrifugal pump, the paper think that floating ring stress will change with the change of centrifugal pump’ s condition. Using fluent software, the floating ring seal was simulated and analyzed. Results show that the liquid force acted on the floating ring is nonuniform and asymmetrical as wedging effect, and that section maximum pressure is not lies in the smallest clearance place, but in the wedge area where liquid flows to the minimum clearance, because the effect of Leak resistance is better in high pressure than low pressure. The leakage decreases and liquid resistance increases with the increases of RPM. The leakage increases with the increases of differential pressure in sealing ring sides and eccentricity. Pressure distribution within the seal clearance is not uniform with the increases of eccentricity.

Attainment of the Pease-Braginskii current in an ultra-high-pressure discharge

2008 ◽  
Vol 34 (5) ◽  
pp. 366-375 ◽  
Author(s):  
A. A. Bogomaz ◽  
A. V. Budin ◽  
S. Yu. Losev ◽  
M. E. Pinchuk ◽  
A. A. Pozubenkov ◽  
...  
Keyword(s):  
High Pressure ◽  
Ultra High Pressure ◽  
Pressure Discharge ◽  
High Pressure Discharge

Design of Ultra-High Pressure Cylinders Based on Principle of Autofrettage

2011 ◽  
Vol 142 ◽  
pp. 24-27 ◽  
Author(s):  
Yu Xian Zhang ◽  
Fang Yao ◽  
Xiao Shuang Men
Keyword(s):  
High Pressure ◽  
Stress Distribution ◽  
Key Words ◽  
Diameter Ratio ◽  
Cylinder Block ◽  
Outer Diameter ◽  
Elastic Plastic ◽  
Ultra High Pressure ◽  
Improved Design ◽  
Autofrettage Pressure

Through the analysis of stress in ultra high-pressure cylinders, found that its stress distribution is very uneven. In order to use the principle of autofrettage for improving design of the cylinders, first with Faupel-Furbe formula to calculate estimates of diameter ratio, and thus are inner and outer diameter of the cylinder block. Then the cylinder is determined parameter of autofrettage on the cylinder such as the optimum radius of elastic-plastic junction and the optimum autofrettage pressure. Finally, analysis and calculation of stress in improved design cylinder, the results show that the improved design of cylinder have a greater degree of improvement in weight, size and stress distribution of three areas. Key words: autofrettage; ultra-high pressure cylinders; diameter ratio; stress distribution.

Theoretical and experimental study on sealing performance of a novel ultra-high pressure bursting disc

2020 ◽  
pp. 095440892095989
Author(s):  
Chao Yang ◽  
Hu Hui ◽  
Song Huang
Keyword(s):  
High Pressure ◽  
Mechanical Analysis ◽  
The Novel ◽  
Device Structure ◽  
Working Pressure ◽  
Burst Test ◽  
Ultra High Pressure ◽  
Sealing Performance ◽  
Sealing Ring ◽  
High Working Pressure

Bursting disc overpressure relief device services as the last safety barrier in preventing catastrophic overpressure of the pressure vessel. The design of ultra-high pressure bursting disc device is a tough engineering issue as it requires both strength and sealing reliability under ultra-high working pressure. In this paper, a novel ultra-high pressure bursting disc device is proposed as well as the sealing structure is designed. Firstly, the novel bursting disc device structure is introduced. Then, the wall thickness of the sealing ring is designed based on elastoplastic mechanical analysis. Numerical simulation is also conducted to investigate the mechanical and sealing performance theoretically. At last, the strength and the reliability of the sealing performance is proved by hydraulic burst test.

Dynamic Load Simulation Analysis of Hemp Stalk

2013 ◽  
Vol 303-306 ◽  
pp. 2724-2726
Author(s):  
Xue Qiang Liu ◽  
Jian Chun Zhang ◽  
Hao Zhang ◽  
Xin Hu
Keyword(s):  
Feeding Rate ◽  
Rotation Speed ◽  
Simulation Analysis ◽  
Equivalent Stress ◽  
Stress And Strain ◽  
Ansys Software ◽  
Bast Fiber ◽  
Maximum Equivalent Stress ◽  
The Difference ◽  
Load Simulation

The distribution of maximum equivalent stress on hemp stalks at different roller speeds were scavenged by LS-PREPOST function. The stress and strain distributions of hemp stalk under the transversely even-distributed load are analyzed through ANSYS software. The results show that hemp decortication largely depended on the rotation speed of separation roller and the feeding rate. In addition, the failure degree of bast fiber, the maturity and the water content of the stalk, and the difference in mechanical properties and geometrical size should be also taken into account.

The Finite Element Analysis of Lei-Ring Applied to Upright Column for Hydraulic Support

2014 ◽  
Vol 635-637 ◽  
pp. 541-544
Author(s):  
Hai Ning Li ◽  
Dan Li ◽  
Xin Xin
Keyword(s):  
Finite Element ◽  
Simulation Analysis ◽  
Equivalent Stress ◽  
Element Model ◽  
Hydraulic Support ◽  
Working Pressure ◽  
Element Analysis ◽  
Sealing Performance ◽  
Sealing Ring ◽  
The Impact

Abstract:In this paper ,the finite element model of the lei-ring was established in ANSYS software,the sealing performance of hydraulic support column piston was analyzed.Also,the numerical simulation analysis was made of the impact of column working pressure on the sealing performance,and a series of the integrated equivalent stress and contact pressure images of sealing ring when working were got. From those images,the location most prone to failure can be concluded.All of work can provide a theoretical reference for the design and use of drum sealing ring used on hydraulic support upright column.

scholarly journals Structure optimization design of high-temperature, high-pressure nuclear power valve

DYNA ◽  
2020 ◽  
Vol 87 (213) ◽  
pp. 148-158
Author(s):  
Wei Li ◽  
Enda Li ◽  
Hao Chang ◽  
Jianrui Liu ◽  
Chang Li ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Stress Distribution ◽  
Nuclear Power ◽  
Optimization Design ◽  
Gate Valve ◽  
Equivalent Stress ◽  
High Stress ◽  
Temperature Deformation ◽  
Valve Body

The nuclear power valve is an important piece of equipment in any nuclear power system. The finite element method was used in this study to analyze the strength and rigidity of the high-temperature and high-pressure nuclear gate valve. The structural characteristics were optimized as per the parameters that affect the strength of the valve body. Fluid-solid coupling technology was utilized to investigate the temperature, deformation, and stress distributions in the structure. A high stress concentration was observed in the initial design; the maximum equivalent stress exceeded the allowable range. Three optimization methods were deployed in efforts to improve the stress distribution. The stress distribution was found to be more uniform post-optimization and the gate valve structure of all three schemes tested met the relevant stress requirements. The optimal scheme was then determined by further comparison. The results presented here may provide a theoretical reference for the optimization of nuclear power valve designs.

Stress Analysis and Exploration of the Rotary Valve

2014 ◽  
Vol 952 ◽  
pp. 206-209
Author(s):  
Ji Cheng Yu
Keyword(s):  
High Pressure ◽  
Stress Analysis ◽  
Axial Force ◽  
Vibration Frequency ◽  
Low Pressure ◽  
Chamber Pressure ◽  
Rotary Valve ◽  
Working Pressure ◽  
Valve Body

the low pressure oil chamber and the high pressure oil chamber act directly on Both sides of the rotary valve. It will be large axial force to the valve body If the system working pressure is greater. The resulting outcome is low vibration frequency of the rotary valve driven hydraulic exciter. How to improve the hydraulic exciter frequency?We can improve the speed of the rotary valve or increase the number of rotary valve guide groove. But if we increase the tank guided number ,the diameter of the rotary valve spoo must be increased. Design a rotary valve without axial force can solve the problem of the rotary valve spool shaft size restricted. By calculation and analysis of the rotary valve spool suffered axial force . The work of a single rotary valve chamber pressure problems can be solved spool axial force

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