The Development of Ultra High-Pressure Hydraulic Systems

1947 ◽  
Vol 156 (1) ◽  
pp. 282-285 ◽  
Author(s):  
S. M. Parker
Keyword(s):  
Hydraulic Engineer ◽  
High Pressure ◽  
Industrial Design ◽  
Hydraulic Systems ◽  
Working Pressure ◽  
Ultra High Pressure ◽  
Specific Loading

Most engineers seek to reduce weight and bulk by the use of higher specific loading of their material. The hydraulic engineer is no exception to this; but his choice of working pressure determines to an unusually large extent the detail construction of most parts of the system. The purpose of this paper is to examine briefly the reasons which lie behind this choice of pressure, with particular reference to the possibility of using a higher working pressure than is in common use at present for the lighter forms of equipment in aircraft, automobile, and industrial design. Within the scope of this paper it will only be possible to examine the essentials of the problem, and to suggest likely solutions, with the knowledge that time and experience will probably provide other and better answers.

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.

scholarly journals Bench tests of a support system of a powered roof support’s hydraulic leg aimed at minimizing consequences of leaks

2019 ◽  
Vol 134 ◽  
pp. 01003
Author(s):  
Dawid Szurgacz ◽  
Jarosław Brodny ◽  
Marcin Brzózka ◽  
Ryszard Diederichs
Keyword(s):  
High Pressure ◽  
Support System ◽  
Extraction Process ◽  
Main Element ◽  
Hydraulic Systems ◽  
Working Pressure ◽  
Bench Tests ◽  
Main Component ◽  
Valve Block ◽  
Roof Support

Effectiveness of a powered roof support significantly impacts on the efficiency and safety of a mining process. The main element of the support is a hydraulic leg which transfers loads imposed by the rock mass. One of the basic issues occurring during the extraction process are internal and external leaks of hydraulic systems. A new support system was designed to limit and later eliminate the consequences of such leaks. Its main component is a valve block equipped with two independent check valves. This solution allows to maintain high pressure in both chambers of a leg despite leaks. The article discusses the developed solution and presents preliminary results of bench tests of a leg equipped with the new block and loaded dynamically. The results are promising, and the tested block fulfils its task by maintaining the working pressure in the leg during load.

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.

scholarly journals Trans-lithospheric diapirism explains the presence of ultra-high pressure rocks in the European Variscides

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Petra Maierová ◽  
Karel Schulmann ◽  
Pavla Štípská ◽  
Taras Gerya ◽  
Ondrej Lexa
Keyword(s):  
High Pressure ◽  
Numerical Models ◽  
Classical Concept ◽  
Plate Interface ◽  
Ultra High Pressure ◽  
Common Process ◽  
Mountain Belts ◽  
Collisional Orogens ◽  
Rock Association ◽  
European Variscides

AbstractThe classical concept of collisional orogens suggests that mountain belts form as a crustal wedge between the downgoing and overriding plates. However, this orogenic style is not compatible with the presence of (ultra-)high pressure crustal and mantle rocks far from the plate interface in the Bohemian Massif of Central Europe. Here we use a comparison between geological observations and thermo-mechanical numerical models to explain their formation. We suggest that continental crust was first deeply subducted, then flowed laterally underneath the lithosphere and eventually rose in the form of large partially molten trans-lithospheric diapirs. We further show that trans-lithospheric diapirism produces a specific rock association of (ultra-)high pressure crustal and mantle rocks and ultra-potassic magmas that alternates with the less metamorphosed rocks of the upper plate. Similar rock associations have been described in other convergent zones, both modern and ancient. We speculate that trans-lithospheric diapirism could be a common process.

scholarly journals Advances in ultra‐high‐pressure and multi‐dimensional liquid chromatography instrumentation and workflows

2021 ◽  
Author(s):  
Jelle De Vos ◽  
Dwight Stoll ◽  
Stephan Buckenmaier ◽  
Sebastiaan Eeltink ◽  
James P. Grinias
Keyword(s):  
High Pressure ◽  
Liquid Chromatography ◽  
Ultra High Pressure
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