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Letteratura scientifica selezionata sul tema "Valves"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 28 luglio 2024

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Articoli di riviste sul tema "Valves"

1

Abergel, E., Y. Bernard, E. Brochet, C. Chauvel, A. Cohen, B. Cormier, J. F. Forissier et al. "Valve prostheses, valves repair and homografts". Archives of Cardiovascular Diseases 101, n. 4 (aprile 2008): 264–71. http://dx.doi.org/10.1016/s1875-2136(08)73703-3.

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2

Klyshnikov, R. Yu, E. A. Ovcharenko, Yu A. Kudryavtseva e L. S. Barbarash. "“VALVE-IN-VALVE” REPROSTHESING OF CARDIAC ARTIFICIAL VALVES". Russian Journal of Cardiology, n. 11 (1 gennaio 2016): 73–80. http://dx.doi.org/10.15829/1560-4071-2016-11-73-80.

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3

Azadani, Ali N., e Elaine E. Tseng. "Transcatheter valve-in-valve implantation for failing bioprosthetic valves". Future Cardiology 6, n. 6 (novembre 2010): 811–31. http://dx.doi.org/10.2217/fca.10.106.

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4

Bapat, Vinayak, e Kaleab N. Asrress. "Transcatheter valve-in-valve implantation for failing prosthetic valves". EuroIntervention 10, n. 8 (dicembre 2014): 900–902. http://dx.doi.org/10.4244/eijv10i8a155.

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5

Hai, Ting, Yannis Amador, Jelliffe Jeganathan, Arash Khamooshian, Robina Matyal e Feroze Mahmood. "Percutaneous Valve in Valve Implantation for Dysfunctional Bioprosthetic Valves". A & A Case Reports 9, n. 8 (ottobre 2017): 227–32. http://dx.doi.org/10.1213/xaa.0000000000000579.

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6

Salaun, Erwan, Anne-Sophie Zenses, Marie-Annick Clavel, Tania Rodriguez-Gabella, Eric Dumont, Siamak Mohammadi, Daniel Doyle et al. "Valve-in-Valve Procedure in Failed Transcatheter Aortic Valves". JACC: Cardiovascular Imaging 12, n. 1 (gennaio 2019): 198–202. http://dx.doi.org/10.1016/j.jcmg.2018.03.011.

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7

Noorani, Alia, e Vinayak Bapat. "Valve-in-Valve Therapy for Failed Surgical Bioprosthetic Valves". Interventional Cardiology Clinics 4, n. 1 (gennaio 2015): 107–20. http://dx.doi.org/10.1016/j.iccl.2014.09.007.

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8

Webb, John G. "Transcatheter valve in valve implants for failed prosthetic valves". Catheterization and Cardiovascular Interventions 70, n. 5 (2007): 765–66. http://dx.doi.org/10.1002/ccd.21379.

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9

Asoh, K., M. Walsh, E. Hickey, M. Nagiub, R. Chaturvedi, K. J. Lee e L. N. Benson. "Percutaneous pulmonary valve implantation within bioprosthetic valves". European Heart Journal 31, n. 11 (15 marzo 2010): 1404–9. http://dx.doi.org/10.1093/eurheartj/ehq056.

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10

Chandola, Rahul, Kevin Teoh, Abdelsalam Elhenawy e George Christakis. "Perceval Sutureless Valve – are Sutureless Valves Here?" Current Cardiology Reviews 11, n. 3 (14 maggio 2015): 220–28. http://dx.doi.org/10.2174/1573403x11666141113155744.

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Tesi sul tema "Valves"

1

Anstine, Lindsey J. "Valve cell dynamics in developing, mature, and aging heart valves". The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1478692972995079.

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2

Золотова, Світлана Григорівна, Светлана Григорьевна Золотова, Svitlana Hryhorivna Zolotova e O. I. Sidorets. "Control ball valves". Thesis, Видавництво СумДУ, 2008. http://essuir.sumdu.edu.ua/handle/123456789/16055.

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3

Iredale, Peter David. "Investigation into unsteady valve flow in steam turbine inlet governing valves". Thesis, University of Leicester, 2000. http://hdl.handle.net/2381/30179.

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Abstract (sommario):

When partially closed, steam turbine governing valves rely on flow separation from the valve head and seat to generate loss and throttle the flow. The aim of this type of valve is to avoid separation and therefore eliminate loss when the valve is fully open, and to have stable and controllable separations at all other valve lifts. Any significant unsteadiness in the valve flow can result in unacceptable mechanical vibration of the valve, which in extreme cases can lead to failure. Results will be discussed from work that has been undertaken into valve flow instabilities at Leicester University Engineering Department in collaboration with Alstom Energy Ltd. At high lifts, the Mach number of the steam flow between the head and the seat is sufficiently low for the fluid to be considered as incompressible. Water was therefore used as the working fluid in the tests at Leicester to model accurately the flow in a fifth scale acrylic model valve under high lift conditions. Results from laser light sheet visualisation, Particle Image Velocimetry and transient pressure measurements of the valve flow are presented. Laser light sheet illumination and high-speed Cine photography have been used to visualise the highly three dimensional valve flow. A range of valve head geometries has been tested. The results of the flow visualisation show the presence of stable and unstable separation zones and their influence on the valve flow. Particle Image Velocimetry has provided quantitative information on these features. Methods for stabilising the separation zones by modifying the valve head and seat have also been investigated and the results from these tests have shown improvements in reducing valve exit pipe unsteadiness.

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4

Bishop, Winona F. "Hydrodynamic performance of mechanical and biological prosthetic heart valves". Thesis, University of British Columbia, 1990. http://hdl.handle.net/2429/29461.

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One of the major achievements in cardiac surgery over the past 30 years has been the ability to replace severely diseased heart valves with prosthetic ones. The option of using prosthetic heart valves for the treatment of valvular diseases has improved and prolonged many lives. This is reflected in around 120,000 heart valve replacement operations carried out every year in North America alone to correct the cardiovascular problems of stenosis, insufficiency, regurgitation, etc. The development of artificial heart valves depends on reliable knowledge of the hemodynamic performance and physiology of the cardiovascular system in addition to a sound understanding, at the fundamental level, of the associated fluid mechanics. It is evident from the literature review that noninvasive measurements in a confined area of complex transient geometry, providing critical information relating to valve performance, are indeed scarce. This thesis presents results of an extensive test program aimed at measuring turbulence stresses, steady and transient velocity profiles and their decay downstream of the mitral valve. Three mechanical tilting disc-type heart valves (Björk-Shiley convexo- concave, Björk-Shiley monostrut, and Bicer-Val) and two biological tissue valves (Hancock II and Carpentier-Edwards supraannular) are studied. The investigation was carried out using a sophisticated and versatile cardiac simulator in conjunction with a highly sensitive, noninvasive, two-component three-beam laser doppler anemometer system. The study covers both the steady (valve fully open) and pulsatile (resting heart rate) flow conditions. The continuous monitoring of the parametric time histories revealed useful details of the complex flow as well as helped establish location and timing of the peak parameter values. In addition, orientation experiments are conducted on the mechanical valves in an attempt to reduce stresses by altering the position of the major orifice. The experiments suggest correlation between high stresses and orientation. Based on the the data, the following general conclusions can be made: (i) Hemodynamic test results should be presented in nondimensional form to render them independent of test facilities, flow velocities, size of models, etc. This would facilitate comparison of results by different investigators, using different facilities and test conditions. (ii) The valves tested showed very disturbed flow fields which generated high turbulent stresses presenting a possibility of thromboembolism and, perhaps, haemolysis. (iii) Implantation orientation of the valve significantly affect the mechanical prostheses flow field. The single vortex formation in the posterior orientation results in a reduction in stresses compared to the anterior configuration. (iv) The present results together with the earlier information on pressure drop and regurgitation provide a comprehensive and organized picture of the valve performance. (v) The information is fundamental to the improvement in valve design, and development of guidelines for test methodology and acceptable performance criteria for marketing of the valves.
Applied Science, Faculty of
Mechanical Engineering, Department of
Graduate

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5

Chan, Gene Yel. "Cryopreservation of porcine heart valves". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/MQ60420.pdf.

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6

Huff, Michael Allan. "Silicon micromachined wafer-bonded valves". Thesis, Massachusetts Institute of Technology, 1993. http://hdl.handle.net/1721.1/12727.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1993.
Includes bibliographical references (v. 2, leaves 429-436).
by Michael Allan Huff.
Ph.D.

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7

Heinrich, Russell Shawn. "Assessment of the fluid mechanics of aortic valve stenosis with in vitro modeling and control volume analysis". Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/16664.

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8

Cole, Matthew. "Feasibility of miniature polypyrrole actuated valves". Thesis, University of British Columbia, 2006. http://hdl.handle.net/2429/32239.

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Polypyrrole is a conducting polymer that can change in volume as its oxidation state is altered. This change in volume, operable at low voltages, can be used to create small actuating devices. The goal of this thesis is to evaluate the use of polypyrrole for the creation of a low voltage polymer valve and to demonstrate the mechanisms that could be used to create these valves. There are a number of challenges in using polypyrrole in a commercially viable valve; it must be able to withstand large temperature variations, have a high strain (to minimize mechanical amplification), have high work density (to minimize the amount of polypyrrole required), have a long lifetime and be assemblable into a compact valve. To evaluate and meet these requirements: 1) The effect of modifying synthesis and actuation conditions on the electrochemical actuation of polypyrrole is investigated to find the conditions that give the highest electrochemical strain and strongest polypyrrole films. Stable and fast strains of 6% at up to 2 MPa for films grown in propylene carbonate and actuated in NaPF6(aq) are achieved. These films were stored for up to 3 months before use with no losses in strain but showed a loss of 0.06% of their maximum strain per electrochemical cycle. 2) Polypyrrole is exposed to temperature variations, showing that high temperature (up to 80°C) exposure has a deleterious effect on polypyrrole actuation. To try and minimize losses, the effect of temperature in both aqueous and organic electrolytes and the mechanism for degradation is investigated. -PF6 grown films in aqueous electrolytes show the least degradation. 3) A linear valve mechanism is built and demonstrates that it should be possible to achieve the force and displacement required to open and close a sliding plate valve. Empirical models suggest that it should be possible to use polypyrrole sliding oil sealed valves. 4) An encapsulatable trilayer is built that seals holes in a perforated plate and could also be used to make a valve.
Applied Science, Faculty of
Electrical and Computer Engineering, Department of
Graduate

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9

Sun, Yongbin. "Development of electromagnetic fluid disc valves". Thesis, University of Surrey, 1993. http://epubs.surrey.ac.uk/843323/.

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The development of electrohydraulic floating-disc valves at the University of Surrey started in the early 1980's. The progress in the last ten years since then has shown that floating-disc valves have the advantages of fast response time, reliable operation, simple configurations, few critical dimensions with no precision sliding surfaces, leading to low cost design and manufacture. They have great potential to fill the gap between conventional solenoid valves and high precision servo valves. However, limitations existed in previous designs hindering further development; for instance relatively large moving mass, low hydraulic stiffness, difficulty of installing springs and poor null position when operating in proportional control mode. The work presented in this thesis concentrates on improving the disc valve electromagnetic characteristics, hydraulic stiffness, electric power consumption, operating reliability, valve size and cost. A novel diaphragm-disc force motor has been successfully developed through this research. The theoretical study and experimental work has shown that the force motor has the features of high spring stiffness, fast response, improved accuracy and linearity, and miniaturised size. By implementing a pair of permanent ring magnets, the diaphragm-disc force motor also has the advantages of lower electric power consumption, dual-lane for fail safety operation, and higher control accuracy. Due to the use of conventional mild steel instead of Remco B soft iron as the coil magnetic conductor material, the valve manufacturing cost has been further reduced. Above all, this novel configuration shows good prospects of competing with the existing torque motor due to its low cost and simple construction. The research described also involves designing and testing two prototype disc valves for specific applications. A single disc pilot valve associated with the diaphragm configuration and permanent magnet arrangement has been built for use in an aviation engine fuel supply system. It has a dual-lane operating mode with a valve size of 58x50x50 millimetres, which is the smallest valve yet made in the disc valve family. The initial test results showed that the valve has good linearity and a bandwidth of 60 Hz in a blocked-load condition. Another successfully built valve is an improved version of a position controlled double-disc valve for use in vehicle semi-active suspension systems. It has been demonstrated that using proportional plus derivative electronic network compensation, the valve can operate continually in the whole damper control domain with the characteristics of balanced fluid forces and low electric power consumption.

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10

Dana, Seresht Mahmoudreza. "Material Selection for Deepwater Gate Valves". Thesis, KTH, Materialvetenskap, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-170023.

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Material selection is an important step during the design process of an object. The goal is to produce an object to meet the requirement with minimum cost. During the recent years with discovery of oil and gas in deep water, oil and gas industry facing new challenges of handling corrosive material in seabed that gives more importance and criticality to material selection of equipment for this kind of application. Hydrogen sulfide (H2S), chloride and carbon dioxide (CO2) have made the big challenges for material that handle corrosive fluids in the seabed.This report presents a brief review of material selection for two parts of deepwater gate valve, Body and Gate. It is mostly focused on mechanical properties and required corrosion resistance. Ferritic alloys with low PRE numbers and low mechanical properties and also austenitic alloys with low yield strength are not a proper option for this case. Alloy 2205 is the most common stainless steel which is used in deep water gate valve production. There are other alloys in duplex group that show better mechanical and chemical properties than alloy 2205 but because of their high expense are not used by industries.

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Libri sul tema "Valves"

1

Zappe, R. W. Valve selection handbook: Engineering fundamentals for selecting manual valves, check valves, pressure relief valves, and rupture discs. 4^a ed. Houston, Tex: Gulf Pub. Co., 1999.

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2

Love, Jack. Autologous tissue heart valves. Austin: R.G. Landes Co., 1993.

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3

Hester, Edward, Michael A. Deneen e Sean T. Socha. World valves. Cleveland: Freedonia Group, 1999.

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4

Hester, Edward, e Michael A. Deneen. Industrial valves. Cleveland, Ohio: Freedonia Group, 1999.

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5

Gottlob, Rainer, e Robert May. Venous Valves. Vienna: Springer Vienna, 1986. http://dx.doi.org/10.1007/978-3-7091-8827-9.

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6

Iaizzo, Paul A., Richard W. Bianco, Alexander J. Hill e James D. St. Louis, a cura di. Heart Valves. Boston, MA: Springer US, 2013. http://dx.doi.org/10.1007/978-1-4614-6144-9.

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Hester, Edward, Michael A. Deneen e Matt Zielenski. World valves. Cleveland, Ohio: Freedonia Group, 2001.

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8

Louis, Barfe, e Key Note Publications, a cura di. Industrial valves. 6^a ed. Hampton: Key Note, 1997.

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9

Dominic, Fenn, e Key Note Publications, a cura di. Industrial valves. 7^a ed. Hampton: Key Note Ltd., 1999.

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10

Deneen, Michael A., Paul N. Dean e Matt Zielenski. Industrial valves. Cleveland: Freedonia Group, 2000.

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Capitoli di libri sul tema "Valves"

1

Vegas, Annette. "Prosthetic Valves, Transcatheter Valves and Valve Repairs". In Perioperative Two-Dimensional Transesophageal Echocardiography, 173–97. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-60902-7_8.

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Vegas, Annette. "Prosthetic Valves Transcatheter Valves and Valve Repairs". In Perioperative Two-Dimensional Transesophageal Echocardiography, 117–35. New York, NY: Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-9952-8_5.

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3

Rennels, Donald C., e Hobart M. Hudson. "Valves". In Pipe Flow, 205–12. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118275276.ch18.

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4

Shoukat Choudhury, Ali Ahammad, Chikezie Nwaoha e Sharad Vishwasrao. "Valves". In Process Plant Equipment, 9–25. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2012. http://dx.doi.org/10.1002/9781118162569.ch2.

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5

Sotoodeh, Karan. "Valves". In Equipment and Components in the Oil and Gas Industry Volume 2, 124–66. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003465881-3.

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6

Pullarcot, Sunil. "Valves". In Process Plant Piping, 109–14. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003328124-8.

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7

Friend, James, e Leslie Yeo. "Piezoelectric Valves". In Encyclopedia of Microfluidics and Nanofluidics, 2765–66. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-5491-5_1246.

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8

Irimia, Daniel. "Pneumatic Valves". In Encyclopedia of Microfluidics and Nanofluidics, 2811–14. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-5491-5_1259.

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9

Gui, Lin, e Carolyn L. Ren. "Thermomechanical Valves". In Encyclopedia of Microfluidics and Nanofluidics, 3289–305. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-5491-5_1580.

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Arnold, Markus, e Heinz Kück. "Electrostatic Valves". In Encyclopedia of Microfluidics and Nanofluidics, 957–60. New York, NY: Springer New York, 2015. http://dx.doi.org/10.1007/978-1-4614-5491-5_465.

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Atti di convegni sul tema "Valves"

1

Schröter, F., R. U. Kuehnel, M. Hartrumpf, R. Ostovar e J. Albes. "Valve in Valve in Rapid Deployment Valves". In 49th Annual Meeting of the German Society for Thoracic and Cardiovascular Surgery. Georg Thieme Verlag KG, 2020. http://dx.doi.org/10.1055/s-0040-1705476.

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2

Xiao, S., J. Cao e M. W. Donoghue. "Valve section capacitance for 660KV HVDC converter valves". In 9th IET International Conference on AC and DC Power Transmission (ACDC 2010). IET, 2010. http://dx.doi.org/10.1049/cp.2010.0993.

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3

Johansen, Peter, Tina S. Andersen, J. Michael Hasenkam, Hans Nygaard e Peter K. Paulsen. "Mechanical heart valve cavitation in patients with bileaflet valves". In 2014 36th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2014. http://dx.doi.org/10.1109/embc.2014.6944910.

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4

Okabe, S., K. Sakamoto, Y. Murakami, T. Ishikawa e R. Miyake. "Pumps, NO-valves, NC-valves on paper analysis chip". In 2012 IEEE 25th International Conference on Micro Electro Mechanical Systems (MEMS). IEEE, 2012. http://dx.doi.org/10.1109/memsys.2012.6170354.

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Pusztai, Tamás. "Study of Backpressure Values of Direct Spring Loaded Safety Valves". In MultiScience - XXXIII. microCAD International Multidisciplinary Scientific Conference. University of Miskolc, 2019. http://dx.doi.org/10.26649/musci.2019.050.

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6

Liu, Xingheng, e Jørn Vatn. "Erosion State Estimation for Subsea Choke Valves Considering Valve Openings". In 32nd European Safety and Reliability Conference. Singapore: Research Publishing Services, 2022. http://dx.doi.org/10.3850/978-981-18-5183-4_r22-06-078-cd.

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Liu, Xingheng, e Jørn Vatn. "Erosion State Estimation for Subsea Choke Valves Considering Valve Openings". In 32nd European Safety and Reliability Conference. Singapore: Research Publishing Services, 2022. http://dx.doi.org/10.3850/978-981-18-5183-4_r22-06-078.

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8

Silva, Gabriel. "Silent Hydraulic Valves". In International Off-Highway & Powerplant Congress & Exposition. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 1991. http://dx.doi.org/10.4271/911804.

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Skrbek, Břetislav, e Jakub Mráz. "SLIDING COUPLES FOR VALVE GUIDES AND VALVES OF PICTON COMBUSTION ENGINES". In METAL 2020. TANGER Ltd., 2020. http://dx.doi.org/10.37904/metal.2020.3545.

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10

Useini, D., H. Christ, M. Schlömicher, P. L. Haldenwang, H. Naraghi, V. Moustafine, M. Bechtel e J. Strauch. "Third Generation Balloon-Expandable Transcatheter Valves versus Rapid Deployment Surgical Valves". In 50th Annual Meeting of the German Society for Thoracic and Cardiovascular Surgery (DGTHG). Georg Thieme Verlag KG, 2021. http://dx.doi.org/10.1055/s-0041-1725829.

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Rapporti di organizzazioni sul tema "Valves"

1

Scarbrough, T. Action plans for motor-operated valves and check valves. Office of Scientific and Technical Information (OSTI), giugno 1990. http://dx.doi.org/10.2172/7176279.

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2

MISKA, C. Griswold Tempered Water Flow Regulator Valves Used as Anti Siphon Valves. Office of Scientific and Technical Information (OSTI), settembre 2000. http://dx.doi.org/10.2172/804841.

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3

VAN KATWIJK, C. Griswold tempered water flow regulator valves used as anti-siphon valves. Office of Scientific and Technical Information (OSTI), luglio 1999. http://dx.doi.org/10.2172/797519.

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VAN KATWIJK, C. Griswold Tempered Water Flow Regulator Valves Used as Anti Siphon Valves. Office of Scientific and Technical Information (OSTI), maggio 1999. http://dx.doi.org/10.2172/798687.

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5

Leedy, R. R., A. R. Ellis, D. P. Hoffmann e G. C. Marsh. Valve studies: Hydrogen fluoride monitoring of UF{sub 6} cylinder valves. Office of Scientific and Technical Information (OSTI), agosto 1996. http://dx.doi.org/10.2172/369673.

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6

Wells, Beric E. Simulant Development for Hanford Tank Farms Double Valve Isolation (DVI) Valves Testing. Office of Scientific and Technical Information (OSTI), dicembre 2012. http://dx.doi.org/10.2172/1069216.

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7

Tullis, J. P. Cavitation guide for control valves. Office of Scientific and Technical Information (OSTI), aprile 1993. http://dx.doi.org/10.2172/10155405.

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8

VAN KATWIJK, C. Fabricated - MCO inlet / outlet valves. Office of Scientific and Technical Information (OSTI), luglio 1999. http://dx.doi.org/10.2172/797524.

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9

Kurita, C. H. Flow Sizing the Cryosystem Valves. Office of Scientific and Technical Information (OSTI), gennaio 1989. http://dx.doi.org/10.2172/1031150.

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10

Wendlandt, J. M. Leakage Rates for Cryolab Valves. Office of Scientific and Technical Information (OSTI), novembre 1988. http://dx.doi.org/10.2172/1031159.

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