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Relevant bibliographies by topics / Butterfly valve

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Academic literature on the topic 'Butterfly valve'

Author: Grafiati

Published: 4 June 2021

Last updated: 17 February 2022

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Journal articles on the topic "Butterfly valve"

1

Park, Ju Yeop, and Myung Kyoon Chung. "Study on Hydrodynamic Torque of a Butterfly Valve." Journal of Fluids Engineering 128, no. 1 (2005): 190–95. http://dx.doi.org/10.1115/1.2137348.

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Since knowledge on hydrodynamic torque of a butterfly valve is very important for butterfly valve design, its hydrodynamic torque is investigated theoretically. For this, a recently developed two-dimensional butterfly valve model is solved through the free-streamline theory with a newly devised iterative scheme and the resulting two-and three-dimensional torque coefficients are compared with previous theoretical results based on the conventional butterfly valve model and experiments. Comparison shows that the improvement due to the new butterfly valve model is marginal. That is, the three-dimensional torque coefficient is well represented by the new model. Otherwise, the two-dimensional torque coefficient is well predicted by the conventional model. In spite this fact, the present results can be used in further researches on butterfly valves because the improved butterfly valve model is mathematically correct and reflects physical reality more correctly than the conventional valve model.

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Eom, K. "Performance of Butterfly Valves as a Flow Controller." Journal of Fluids Engineering 110, no. 1 (1988): 16–19. http://dx.doi.org/10.1115/1.3243503.

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Butterfly valves have been used for shut-off and throttling-control application. It is found that the information available on loss coefficients of butterfly valves for good throttling control is limited at present. This report investigates the performance of two different configurations of butterfly valve: perforated blades and different diameter of solid blades that allow partial opening of the valve at closed position. The experimental results support the suitability of a butterfly valve for good flow control.

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Arman, Rizky, Yovial Mahyoedin, Kaidir Kaidir, and Nando Desilpa. "STUDI ALIRAN AIR PADA BALL VALVE DAN BUTTERFLY VALVE MENGGUNAKAN METODE SIMULASI COMPUTATIONAL FLUID DYNAMICS." JURNAL KAJIAN TEKNIK MESIN 4, no. 1 (2019): 38–49. http://dx.doi.org/10.52447/jktm.v4i1.1474.

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ABSTRAKValve adalah alat mekanis yang mengatur aliran atau tekanan cairan. Fungsinya adalah menutup atau membuka aliran, mengontrol laju aliran, mengalihkan aliran, mencegah aliran balik, mengontrol tekanan, atau mengurangi tekanan. Masalah yang umumnya ditemui adalah penutupan valve tidak sempurna dikarenakan adanya kotoran-kotoran yang menghalangi penutupnya untuk menutup secara sempurna. Penanganannya yang paling sederhana yaitu membersihkan dudukan dari kotoran-kotoran tadi secara intensif dan dilakukan pelumasan. Penelitian ini bertujuan untuk menjelaskan gambaran tentang simulasi aliran pada ball valve dan butterfly valve. Dan menjelaskan perbandingan tekanan, temperatur dan kecepatan distribusi air pada dua jenis valve. Tekanan fluida pada kondisi tertutup berbeda dengan kondisi terbuka. Hal ini akan berdampak terhadap kekuatan ball valve dan butterfly valve. Tekanan yang besar atau melebihi spesifikasi akan mempengaruhi mekanisme kerja dan kekuatan material. Pengaruh tekanan ini menjadi sangat penting dalam ball valve dan butterfly valve karena tekanan fluida dengan temperatur, pada kondisi tertentu bisa di luar batas spesifikasi khususnya pada ball valve Sanitary SS316 Mounting Pad 3 inci dan butterfly valve Sanitary SS 304 3 inci. Metode yang digunakan adalah Computational Fluid Dynamics dengan bantuan Software Flow Simulasi Solidwork 2014.Kata Kunci: Ball and Butterfly Valve, Solidwork, Flow Simulasi, CFD, Tekanan, Temperatur, Kecepatan aliran. ABSTRACTValves are mechanical devices that regulate fluid flow or pressure. Its function can close or open the flow, control the flow rate, divert flow, prevent backflow, control pressure, or reduce pressure. The problem commonly encountered is that the valve closure is not perfect due to the impurities that prevent the cover from closing completely. The simplest handling is to clean the holder from the dirts earlier and do lubrication. This study aims to explain the description of the flow simulation on ball valve and butterfly valve. This study also explain the comparison of pressure, temperature and velocity of water distribution in two types of valve heads. Fluid pressure under closed conditions is different from opening conditions. This will affect the strength of the ball valve and butterfly valve as a valve. Pressure that is large or exceeds specifications will affect the working mechanism and material strength. The effect of this pressure becomes very important in the ball valve and butterfly valve because of fluid pressure with temperature under certain conditions it can be out of the specification limits, especially in Sanitary SS316 Mounting Pad 3-inch ball valve and SS 304 3 inch Sanitary butterfly valve. This method was used in research is Computational Fluid Dynamics by utilizing of Flow Simulation Solidwork 2014 Software.Keywords: Ball Valve, Butterfly Valve, Solidwork 2014, Flow Simulation, CFD, Pressure, Temperature, Velocity

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Kimura, Takeyoshi, Takaharu Tanaka, Kazuhiko Ogawa, and Kayo Fujimoto. "Fluidmechanics Characteristics of Butterfly Valve." JOURNAL OF THE MARINE ENGINEERING SOCIETY IN JAPAN 30, no. 6 (1995): 448–52. http://dx.doi.org/10.5988/jime1966.30.448.

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Tian, Xiao Bo, Jin Tang Yang, and Dan Meng. "CAE Simulation Study on Thermal Stress of Butterfly Valve and Actuator." Applied Mechanics and Materials 532 (February 2014): 301–6. http://dx.doi.org/10.4028/www.scientific.net/amm.532.301.

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To the valve system in the furnace hot air duct of the hot-rolled furnace in steel, the thermal Stress of butterfly valve and actuator was simulated by ANSYS. The feasibility of appropriate temperature control measures of too high temperature of butterfly valve and actuator was verified. And in the field, the transformation and the temperature measurement of butterfly valve and actuator were performed; the failure rate was calculated, to ensure that butterfly valve and actuator could meet the requirements of hot rolling.

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Et. al., R. Manikandan,. "Design and Analysis of Butterfly Valve." Turkish Journal of Computer and Mathematics Education (TURCOMAT) 12, no. 1S (2021): 502–12. http://dx.doi.org/10.17762/turcomat.v12i1s.1915.

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The main objective of this project is shape optimization and structural stability of the butterfly valve for metallic and nonmetallic materials butterfly valve is mostly used in the engine carburetors need to make structural stability and shape optimization plays the main role for this component, design modifications and material comparative analysis done in ANSYS Structural modules and find the optimized shape through stress, strain and deformation results

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Xu, Benliang, Zuchao Zhu, Zhe Lin, Dongrui Wang, and Guangfei Ma. "Numerical and experimental research on the erosion of solid-liquid two-phase flow in transport butterfly valve based on DEM method." Industrial Lubrication and Tribology 73, no. 4 (2021): 606–13. http://dx.doi.org/10.1108/ilt-12-2020-0454.

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Purpose The purpose of this paper is to analyze the mechanism of particle erosion in butterfly valve pipelines under hydraulic transportation conditions. The results will affect the sealing and safety of butterfly valve pipelines and hopefully serve as reference for the anti-erosion design of butterfly valve pipelines. Design/methodology/approach Through the discrete element method (DEM) simulation that considers the force between particles, the detached eddy simulation (DES) turbulence model based on realizable k-epsilon is used to simulate the solid-liquid two-phase flow-induced erosion condition when the butterfly valve is fully opened. The simulation is verified by building an experimental system correctness. The solid-liquid two-phase flow characteristics, particle distribution and erosion characteristics of the butterfly valve pipeline under transportation conditions are studied. Findings The addition of particles may enhance the high-speed area behind the valve. It first increases and then decreases with increasing particle size. With increasing particle size, the low-velocity particles change from being uniformly distributed in flow channel to first gathering in the front of the valve and, then, to gathering in lower part of it. Fluid stagnation at the left arc-shaped flange leads to the appearance of two high-speed belts in the channel. With increasing fluid velocity, high-speed belts gradually cover the entire valve surface by focusing on the upper and lower ends, resulting in the overall aggravation of erosion. Originality/value Considering the complexity of solid-liquid two-phase flow, this is the first time that the DEM method with added inter-particle forces and the DES turbulence model based on realizable k-epsilon has been used to study the flow characteristics and erosion mechanism of butterfly valves under fully open transportation conditions.

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Asai, Tohru. "Butterfly technique in mitral valve repair." Asian Cardiovascular and Thoracic Annals 28, no. 7 (2020): 413–15. http://dx.doi.org/10.1177/0218492320916298.

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Degenerative mitral regurgitation due to posterior leaflet prolapse is often associated with tissue redundancy in the leaflet height and free margin of the prolapsing segment. The butterfly technique has been introduced for focal resection to precisely control the leaflet height without annular plication. This technique is indicated for a high prolapsing leaflet, greater than 20 mm. With intraoperative measurement of leaflet heights and ink dot marking as a depth indicator, the butterfly technique can be safely performed in most high posterior leaflet prolapse cases, without increasing the risk of systolic anterior motion.

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Mândrea, Lucian, Corina Cipu, Corina Băbuţanu, and Gabriela Oprina. "The Effects Produced by a Butterfly Valve in a Hydraulic Closed Circuit." Applied Mechanics and Materials 811 (November 2015): 117–21. http://dx.doi.org/10.4028/www.scientific.net/amm.811.117.

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The paper presents the operation of a hydraulic closed circuit equipped with a butterfly valve which can close with a step of 10o. Using four pressure transducers and one temperature transducer, the authors determined the volumetric flow rate, the average water velocity and the local pressure loss in the butterfly valve, the flow coefficient Kv and also the incipient cavitation coefficient. Recommendations for the disposal of the butterfly valve are made and conclusions are obtained regarding the range of opening degrees in which the butterfly valve is better to be used.

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Wang, Xiao Zhi, Hong Hui Zhu, and Zhi Gang Liu. "Coupling Effect of Temperature Stress in Butterfly Valve Mechanical System Based on FLUENT Numerical Simulation." Applied Mechanics and Materials 716-717 (December 2014): 702–6. http://dx.doi.org/10.4028/www.scientific.net/amm.716-717.702.

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The butterfly valve system is an important part of the steel heating furnace temperature control. In high temperature, the coupling effect of temperature field and stress deformation of the butterfly valve is stronger. We did not consider it in the numerical simulation research in the past, and studied the overall characteristics of butterfly valve only by 2D numerical simulation, resulting in the decrease of the numerical simulation accuracy. This paper uses the way of the FLUENT software and ANSYS software joint control, and has established the mathematical model of fluid and solid coupling effect, and has implemented the coupling effect of the temperature field and stress field of the butterfly valve system by means of three dimensional numerical simulation, then we have got the temperature distribution and stress distribution of the butterfly valve system, which provides technical reference for mechanical system design of butterfly valve.

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Dissertations / Theses on the topic "Butterfly valve"

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Del, Toro Adam. "Computational Fluid Dynamics Analysis of Butterfly Valve Performance Factors." DigitalCommons@USU, 2012. https://digitalcommons.usu.edu/etd/1456.

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Butterfly valves are commonly used in industrial applications to control the internal flow of both compressible and incompressible fluids. A butterfly valve typically consists of a metal disc formed around a central shaft, which acts as its axis of rotation. As the valve's opening angle is increased from 0 degrees (fully closed) to 90 degrees (fully open), fluid is able to more readily flow past the valve. Characterizing a valve's performance factors, such as pressure drop, hydrodynamic torque, flow coefficient, loss coefficient, and torque coefficient, is necessary for fluid system designers to account for system requirements to properly operate the valve and prevent permanent damage from occurring. This comparison study of a 48-inch butterfly valve's experimental performance factors using Computational Fluid Dynamics (CFD) in an incompressible fluid at Reynolds numbers ranging approximately between 105 to 106 found that for mid-open positions (30-60 degrees), CFD was able to appropriately predict common performance factors for butterfly valves. For lower valve angle cases (10-20 degrees), CFD simulations failed to predict those same values, while higher valve angles (70-90 degrees) gave mixed results. (152 pages)

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Lind, Sofia. "Wear reduction between disc edge and seat in a butterfly valve." Thesis, Karlstads universitet, Fakulteten för hälsa, natur- och teknikvetenskap (from 2013), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-62586.

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This thesis was written on behalf of SOMAS instruments AB. SOMAS develops, manufactures and markets valves. The mission was to reduce the wear between the disc edge and the seat in a butterfly valve that are used at high temperatures. This study investigated the possibility of using a surface treatment or coating that can reduce wear or if a new base material is better to use than the current steel 316 material. Possible materials, surface treatments and coatings were investigated and compared in a material study. In discussion with the company, four test pairs were chosen; • Steel 316 - Steel 316 • Steel 316 - Nitronic 60 • Nitronic 60 - Nitronic 60 • Steel 316 - Steel 316 with a surface coating of Tribaloy T-400 The wear behavior of the selected materials was investigated using a test rig at Karlstad University based on the method of block-on-ring. The machine spins a cylinder that corresponds to the seat against a block which in this case corresponds to the disc edge. The tests were carried out at room temperature, 250 ˚C and 500 ˚C. The cylinder was spinning at a speed of 100 rpm while the block pressed against with a load of 50 N. A profilometer, micro-hardness tester and scanning electron microscope (SEM) were used to investigate the wear. A comparison was made based on the volume of material removed from the blocks, the maximum wear depth of the blocks and the maximum wear depth of the cylinder. Wear mechanisms, chemical composition and hardness profiles were used to explain differences in results. The results were compared with the steel 316 to steel 316 solution. The Tribaloy T-400 showed good properties to reduce the wear at room temperature. Block made of Tribaloy T-400 showed no wear, instead steel from the cylinder had been adhered to the blocks. At higher temperatures, the amount of adhered material on the tribaloy T-400 increased, resulting in more wear at the surface of the cylinder than at room temperature. The wear on the cylinder was comparable to the wear of a steel cylinder that slid against a steel block. Nitronic 60 against nitronic 60 exhibited a significant reduction in wear compared with steel to steel at room temperature. At higher temperatures, nitronic 60 against nitronic 60 was the test pair that exhibited least wear. Nitronic 60 is recommended for further examination as a material in both the disc edge and the seat in a butterfly valve to be used at both room temperature and elevated temperatures.<br>Detta examensarbete skrevs på uppdrag från SOMAS instruments AB. SOMAS utvecklar, tillverkar och marknadsför ventiler. Uppdraget gick ut på att minska nötningen mellan spjällkanten och sätet i en vridspjällsventil som ska användas i höga temperaturer. Denna studie undersökte möjligheten det att använda en ytbehandling eller ytbeläggning som kan minska nötningen eller om ett nytt basmaterial är bättre att använda än det nuvarande materialet stål 316. Möjliga material, ytbehandlingar och ytbeläggningar undersöktes och jämfördes i en materialstudie. I diskussion tillsammans med företaget så valdes fyra stycken testpar; • stål 316 - stål 316 • stål 316 - nitronic 60 • nitronic 60 - nitronic 60 • stål 316 - stål 316 med en ytbeläggning av tribaloy T-400 Nötningsbeteendet hos de valda materialen undersöktes med hjälp av en testrigg på Karlstad universitet som bygger på metoden ”block-on-ring”. Maskinen snurrar en cylinder som motsvarar sätet mot ett block som i detta fall motsvarar spjällkanten. Testerna utfördes i rumstemperatur, 250 ˚C och 500 ˚C. Cylindern snurrade med en hastighet av 100 rpm medan blocket tryckte mot med en last på 50 N. En profilometer, mikrohårdhetstestare och svepelektronmikroskåp användes för att undersöka nötningen. En jämförelse gjordes baserad på volymen av det bortnötta materialet från blocken, maximala nötningsdjupet på blocken och maximala nötningsdjupet på cylindern. Slitagemekanismer, kemisk sammansättning och hårdhetsprofiler användes för att kunna förklara skillnader i resultaten. Resultaten jämfördes mot stål 316 mot stål 316. Tribaloy T-400 visade upp bra egenskaper för att kunna minska nötningen i rumstemperatur. Block gjorda av Tribaloy T-400 uppvisade ingen nötning, istället hade material från stål cylindern adderats på blocken. Vid högre temperaturer så ökade mängden adderat material på tribaloy T-400 vilket resulterade i att ytan på cylindern uppvisade mer nötning än i rumstemperatur. Nötningen på cylindern kunde jämföras med nötningen hos en stålcylinder som glidit mot ett stål block. Nitronic mot nitronic uppvisade vid rumstemperatur en stor minskning av nötning jämfört med stål mot stål. Vid högre temperatur var nitronic 60 mot nitronic 60 det test par som uppvisade minst nötning. Nitronic 60 rekommenderas för vidare undersökning som material i både spjällkanten och sätet i en vridspjällsventil som ska användas i både rumstemperatur och i höga temperaturer.

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Taylor, Ryan Chandler. "Effect of a Simulated Butterfly Valve on the Erosion-Corrosion Rate of Nickel Aluminum Bronze Alloys in Highly Turbulent Seawater." Thesis, Virginia Tech, 2018. http://hdl.handle.net/10919/83818.

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Nickel aluminum bronze (NAB) alloys are used in naval and maritime applications for their excellent corrosion resistance under the influence of seawater. One application involves the use of a NAB butterfly valve within a NAB fluid line to control fluid flow of seawater. Due to the chaotic environment, the corrosion rate of the NAB tubing downstream from the valve increases significantly. The disc angle at which the valve alters fluid flow causes an increase in the fluid velocity and an increase in the turbulence produced on the downstream side of the valve. These fluid conditions contribute to the increase in the corrosion rate of the NAB piping downstream from the valve. This thesis aims to characterize how the change in the disc angle of the butterfly valve causes a change in the erosion-corrosion rate of NAB downstream from the valve. A butterfly valve is simulated using orifice plates of varying diameters to mimic flow conditions at different disc angles. An orifice plate is a simple device with a hole in its center that is designed to restrict fluid flow across a fluid line. Under the same hydrodynamic conditions, the orifice produces nearly the exact same flow coefficients as the valve. At a volumetric flowrate of 0.00757 m^3/s a total of eight locations found along the liquid/metal interface produced pitting sites. The average passivation layer thickness is also measured.<br>Master of Science

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Miguel, Eloir. "Análise do fenômeno da cavitação em válvula borboleta usando a fluidodinâmica computacional." Universidade de Taubaté, 2015. http://www.bdtd.unitau.br/tedesimplificado/tde_busca/arquivo.php?codArquivo=766.

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O foco desta pesquisa é a análise computacional da cavitação em válvula borboleta utilizando o software comercial Ansys CFX versão 14. Dentre várias aplicações, a válvula pode ser utilizada no controle da vazão de água para lavagem de gases oriundos do processo de fabricação do aço num conversor LD. Foi estabelecido como parâmetros constantes de simulação, a pressão a montante e jusante respectivamente em 150 e 60 kPa e a temperatura de 80C. O objetivo deste trabalho é conhecer, através da simulação computacional, os ângulos em que a cavitação torna-se crítica na válvula borboleta, mapeando as áreas de cavitação, que será validada pelo equacionamento da válvula, de acordo com a norma da ISA. Será analisado o escoamento do fluído, priorizando a variável pressão e diferencial de pressão através da válvula, variando os ângulos do obturador de 10 em 10 graus, até o ângulo de 70. Em seguida, serão feitas novas simulações com as temperaturas de 50, 60, 70 e 90C, haja vista que, a vaporização da água está diretamente relacionada, não somente com a pressão, mas também com a temperatura do fluído. A escolha desta válvula para estudo dá-se pelo fato de ter uma alta recuperação de pressão a jusante, levando ao colapso as bolhas de vapor, quando a pressão se eleva acima da pressão de vapor da água, resultando no fenômeno físico denominado por cavitação, alvo de análise e mapeamento desta pesquisa. O regime de escoamento do fluído newtoniano é turbulento e utilizou-se a técnica de volumes finitos idealizada por Patankar, para resolução numérica, e o software comercial CFX versão 14 da Dinâmica de Fluidos Computacional. Foi utilizada a geometria e condições de contorno operacionais de uma válvula borboleta para investigar as regiões as quais ocorrem possibilidades de desgaste e focos de cavitação.<br>The focus of this study is a computational analysis of cavitation in butterfly valve using a commercial software named Ansys CFX version 14. Among several applications, the valve may be used in controlling water flow for gas washing originating from the washing process in a steelmaking converter LD. Therefore, the constant pressure upstream and downstream respectively at 150 and 60 kPa and de 80C , was established as constant simulation parameter. The purpose of this study is find out, using a computer simulation, which angles at the cavitation becomes critical in the butterfly valve, and mapping the areas of cavitation, which will be validated by the valve equation, according to ISA standards. Therefore, the flow of the fluid will be analyzed, prioritizing the variable and the differential constant pressure through the valve by varying the obturators angles from 10 to 10 degrees, until it comes to a 70 angle. To achieve this purpose, new simulations will be made with temperatures of 50, 60, 70 and 90 degrees, considering that the water vaporization is directly related to not only the pressure but also the temperature of the fluid. In this study, the butterfly valve was chosen because of its high downstream pressure recovery, leading to collapse of the vapor bubbles, when the pressure is elevated above the water vapour pressure, resulting in the physical phenomenon known as cavitation, which is the target analysis and mapping of this study. The Newtonians flow regime was found turbulent and to numerical solution was used the technique of finite volume designed by Patankar, by using commercial software CFX version 14.0 of Computational Fluid Dynamics. Was used both geometric and operational contour of a butterfly valve project to investigate in which part and conditions of a valve can occur potential wear and cavitations spots.

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Gipka, Ondřej. "Ekonomický náhled volby rychlozávěrného ventilu pro vodní dílo Vranov." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2012. http://www.nusl.cz/ntk/nusl-230430.

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The thesis deals with the evaluation of the investment in the fast closing valve replacement in The dam Vranov using Computational fluid dynamics (CFD). The final effects of the fast closing valve replacement will be examined on three different types of valves with regard to the turbine output in operation zone and without the influence of water intake runner and turbine draft tube. The aim of the thesis is to theoretically evaluate alternatives of the fast closing valve replacement and define its basic characteristics and classifications.

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Foral, Martin. "Optimalizace sacího potrubí zážehového motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2009. http://www.nusl.cz/ntk/nusl-228432.

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The work deals with design solutions to the intake manifold modern contemporary internal combustion engines. Then describes the types of flow and structural design of ports, including the intake of their basic properties. The thesis also compare the results of the analysis and design optimization based on simulation of flow inlet port and measure the actual inlet port.

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Davis, R. Ted. "Aerating Butterfly Valves to Suppress Cavitation." DigitalCommons@USU, 1986. https://digitalcommons.usu.edu/etd/3952.

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Proper aeration of cavitating hydraulic equipment can greatly reduce cavitation intensity, noise, and damage. This thesis quantifies the benefit, in terms of damage and noise, from aerating six inch butterfly valve. The incipient damage level of cavitation was obtained for both aerated and non -ae ra ted conditions. The level is defined as one pit per square inch of a soft aluminum test specimen per one minute of operation. A description of the cavitation pits that occurred plus where they appeared is presented. A graph showing the aerated and non-aerated limits of incipient damage is given along with a table showing the percent reduct ion of damage from aeration. A graph and table are also given depicting the reduction in noise. The proper location of aeration ports to allow natural aeration is outlined .

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Huška, Lukáš. "Software pro řízení zapalování a vstřikování spalovacích motorů." Master's thesis, Vysoké učení technické v Brně. Fakulta elektrotechniky a komunikačních technologií, 2010. http://www.nusl.cz/ntk/nusl-218797.

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This master thesis deals with ignition systems which are used in cars vehicles with gas engines and also with setting of the best moment of ignition of gasoline-air mixture in cylinders of engine. Ways of gas injection at diesel engines and their control systems are also described in this thesis. Next chapter deals with control unit and describes main actions which are necessary for today’s motor vehicles. As illustration is used example of succession of actions which are necessary for calculation and setting regular value of pre-ignition. At the end is shown animation, which can be used for practice lessons in a subject Automobile Electric and Electronic Systems as a example. It will simplify understanding of described activities which are all accomplished by central control unit. For purposes of laboratory lessons is in this thesis also discussed measuring of engine performance with changes of parameter of central control unit.

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Gomes, Kirk J. "Experimental High Speed Compressible Subsonic Flow Pressure Losses Across Gate, Butterfly and Ball Valves and Their Use in Natural Gas Transmission Flow Control Simulation Software." University of Toledo / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1301930298.

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Müller, Jan. "Kondenzační technika a odvody spalin." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2014. http://www.nusl.cz/ntk/nusl-226844.

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This thesis is developed as a proposal for heating for a primary school and kindergarten in the region of Brno-countryside. For the insulated building, a combination of heating and air-conditioning is proposed. The concept is designed so that the air-conditioning preheats the exterior air and the heating system warms the incoming air to a comfortable temperature. For the required thermal performance, sources of heat (for gas and pellets) and a layout solution for the boiler room is designed. Drainage of combustion products is proposed for both solutions. The project solution is per the extent of the construction permit. The theoretical part is linked with the practical part through the condensation boilers, their function and division, and drainage of combustion products. The experiment for the given topic was conducted on the drainage of combustion products. The pressure loss of the reverse knob was determined in relation to the flow rate of air in the condensation boilers as this loss is essential in assessing the drainage of combustion products.

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Books on the topic "Butterfly valve"

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Papadopoulos, A. A value analysis investigation of a fire protection butterfly valve. UMIST, 1990.

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Eom, Kenny. Performance of butterfly valves as a flow controller. Institute for Aerospace Studies, 1986.

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3

Amzad, Ali, and Schuraytz Irving M, eds. Butterfly valves: Torque, head loss, and cavitation analysis. 2nd ed. American Water Works Association, 2012.

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4

Serrudo, Juan Fernando Guerra. Mi guía de mariposas del Valle de La Paz: My butterfly guide of Valley of La Paz = Chuquiyaw qhirwa tuqin pilpintut yatxatawi. UTB, Universidad Tecnológica Boliviana, 2014.

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The 2006-2011 World Outlook for Industrial Power-Operated, On-Off Mounted Butterfly Valve Actuators. Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007-2012 World Outlook for Industrial Power-Operated, On-Off Mounted Butterfly Valve Actuators. ICON Group International, Inc., 2006.

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Butterfly Valves: Torque, Head Loss, and Cavitation Analysis (Awwa Manual). American Water Works Association, 2001.

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Ackery, PR, CR Smith, and R. Vane-Wright. Carcasson's African Butterflies. CSIRO Publishing, 1995. http://dx.doi.org/10.1071/9780643100787.

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The result of more than 20 years of research and collaboration by international butterfly experts, this book is the first comprehensive catalogue to the butterfly fauna of any major tropical region and, as such, provides a basic research tool for any worker with an interest in African butterflies. Covering 3593 recognised species in 300 genera, it deals with about 20% of the world butterfly fauna. Included are entries for all genus-group, species-group and infra-subspecific names applicable to the Afrotropical butterflies, a total of about 14 000 names. This work has a more wide-ranging appeal than a narrow taxonomic list, a volume that will be of value not only to taxonomists but to all biologists with an interest in Africa and its butterfly fauna.

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Noise generated by flow through large butterfly valves. National Aeronautics and Space Administration, 1987.

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Parker, Philip M. The 2007-2012 World Outlook for Parts for Industrial Butterfly Valves. ICON Group International, Inc., 2006.

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Book chapters on the topic "Butterfly valve"

1

Youngchul, Park, and Song Xueguan. "Numerical Analysis of Large Diameter Butterfly Valve." In Lecture Notes in Electrical Engineering. Springer Netherlands, 2009. http://dx.doi.org/10.1007/978-1-4020-8919-0_24.

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Huh, Sun Chul, Yong Gil Jung, Won Jo Park, and Jae Joon Sim. "A Study on Sealing Mechanism of Butterfly Valve." In Experimental Mechanics in Nano and Biotechnology. Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/0-87849-415-4.1259.

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Kim, S. W., J. H. Kim, Y. D. Choi, and Y. H. Lee. "Flow Characteristics of Butterfly Valve by PIV and CFD." In New Trends in Fluid Mechanics Research. Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-75995-9_149.

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Patil, Shridevi V., V. N. Gaitonde, Vinayak N. Kulkarni, and Sanjay V. Kulkarni. "Rearranging and Optimizing of Butterfly Valve Manufacturing Layout Using Simulation." In Lecture Notes in Mechanical Engineering. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9931-3_19.

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Yi, Guodong, Shaoju Zhang, and Zhenan Jin. "Simulation Analysis of Sealing Performance of Double-Offset Butterfly Valve." In Advances in Mechanical Design. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9941-2_69.

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Mu, Yuanpeng, Zhixian Ma, and Mingsheng Liu. "Research of the Influence of Valve Position on Flow Measurement of Butterfly Valve with Differential Pressure Sensor." In Environmental Science and Engineering. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-13-9524-6_29.

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Chen, Zhikun, Ruicheng Zhang, and Xu Wu. "Active Disturbance Rejection Decoupling Control Method for Gas Mixing Butterfly Valve Group." In Information Computing and Applications. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25255-6_77.

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Large, Julien, Jérôme Fouque, and David Reungoat. "Study of the Hydrodynamic Phenomena and Fluid–Structure Interactions of a Bypass Butterfly Valve with Double Disc." In Advances in Hydroinformatics. Springer Singapore, 2013. http://dx.doi.org/10.1007/978-981-4451-42-0_28.

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Rajagopal. "Consumer Value Management." In The Butterfly Effect in Competitive Markets. Palgrave Macmillan UK, 2015. http://dx.doi.org/10.1057/9781137434975_5.

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Sansone, Robert C. "Contiguous Sealing of Metal Seated Butterfly Valves." In Proceedings of the 2nd International Conference on Developments in Valves and Actuators for Fluid Control. Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/978-3-662-11463-6_2.

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Conference papers on the topic "Butterfly valve"

1

Salinas, Michael A., J. Warren Green, and Kevin Tran. "Revising the City of Houston’s Standard Butterfly Valve Detail for Large Diameter Butterfly Valves." In Pipelines 2020. American Society of Civil Engineers, 2020. http://dx.doi.org/10.1061/9780784483190.025.

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Avila, Alberto, Cristian Carvajal, and Carlos Cotrino. "Characterization of a butterfly-type valve." In 2011 IEEE IX Latin American Robotics Symposium and IEEE Colombian Conference on Automatic Control (LARC). IEEE, 2011. http://dx.doi.org/10.1109/larc.2011.6086857.

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Park, Ju Yeop, Gong Hee Lee, and Do Hwan Lee. "Study on the Operability Margin Variation of Butterfly Valve." In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37512.

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Design basis capability of safety-related butterfly valve of nuclear power plant should be verified due to the regulation of Korea. Therefore, based on the results from the torque coefficient of thin symmetric plate, the nuclear utility has performed the engineering calculation to determine the required torque for operating a butterfly valve and the margin of operability at design basis condition. However, recent research showed that the torque coefficient of the thin symmetric plate used before is rather larger than newly determined one. Therefore, in the present study, the effect of change in the torque coefficient of thin symmetric plate on the operating margin is investigated. First, the recently determined valve loss coefficient of thin symmetric plate is modified at near valve full open position to reflect a finite thickness of valve disk. Second, the torque coefficient of symmetric disk butterfly valve is determined from the loss coefficient and the torque coefficient of thin symmetric plate and using this, the torque coefficient of butterfly valve with asymmetric disk is also deduced. Then, the variation on the hydrodynamic torque of butterfly valve is quantified and the operating margin variation of safety-related butterfly valve is determined. Calculations of the operating margin are performed for 10 butterfly valves of Uljin 6 nuclear power plant of Korea, which have all asymmetric valve disks. As expected, the hydrodynamic torque which is proportional to the torque coefficient is reduced and the resulting margin of operability is improved for opening safety direction. The margin improvement amounts to from 6.0% to 142.9% for valves considered. For closing safety direction, although the hydrodynamic torque is also reduced, the total dynamic torque due to overall hydrodynamic effect is increased from 1.1% to 63.0% on the contrary. This increase is because the hydrodynamic torque assists valve closing. Despite of these increases in the total dynamic torque, the operability margins of closing direction do not change at all. The reason is that the required torque for operating valve is determined not by the total dynamic torque but by the total seating torque which is more dominating. In conclusion, the margin improvement is significant for opening otherwise the margin deterioration is slight for closing when the torque coefficient is reduced.

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Kim, Donghae. "Weak-Link Analysis of Motor-Operated Butterfly Valve." In 2002 International Joint Power Generation Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/ijpgc2002-26095.

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The purpose of this paper is to address the structural integrity of the motor operated butterfly valve assembly by providing the methodology and equations to quantitatively determine the permissible component load in the load path from the operator to the valve. The weak link analysis is to determine the maximum allowable torque on the butterfly valve by equating the stresses caused by the torque and seismic load with the appropriate allowable stress value, and then the unknown torque is solved. Analysis methods are based on classical static force balancing equations and on classical axial, shear, and bending stress equations using the worst possible load combinations including seismic loads resulting from design basis earthquake.

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Ogawa, K. "Cavitation Noise Reduction Around a Butterfly Valve by Semicircular Fins." In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37418.

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Butterfly valves are widely used in industry because of their compactness and simple construction. Many kinds of valves have been proposed to prevent cavitation. However, those valves are fairly expensive and the structures of the valve are complicated. In this paper, the attachment of fins to the valve body is proposed to reduce cavitation noise. The cavitation around the butterfly valve occurs because of the interference of the flow from the nozzle side and the flow from the orifice side. To avoid this interference, semicircular fins were attached to the valve body. From the experimental results, it was confirmed that the attachment of the fins was very effective in reducing the cavitation noise.

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Wu, Jun, Fan Bai, Yong Liu, Xingsheng Lao, and Chunhui Dai. "Numerical Research on Shock Resistance Safety Analysis of Ship Power Plant Valve." In 2018 26th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/icone26-82137.

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In order to increase the operation safety of ship nuclear power platform. A typical butterfly valve with nuclear safety class 2 of ship power plant is studied in this paper. Numerical analysis on shock resistance safety of butterfly valve is conducted by three-dimensional finite element method. Firstly, the load type under working condition and the stress evaluation criteria of valve safety analysis are determined based on national standards and ASME standards. Secondly, the finite element model of butterfly valve is constructed and the equivalent stress distribution of butterfly valve is obtained under static loads and constraint conditions. Moreover, the butterfly valve natural frequencies and vibration shapes are obtained by modal analysis under inspection working condition. Furthermore, the butterfly valve stress distributions on three coordinate directions are analyzed by shock response spectrum analysis according to the modal analysis results. Lastly, the total stress distribution of butterfly valve is obtained by superposition procedure. And the butterfly valve structure shock resistance safety is checked based on the stress evaluation criteria.

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Lattouf, Dominic, and B. P. Huynh. "Flow Across a Butterfly Valve in a Dam Penstock." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71322.

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Butterfly valves are typically used as emergency closure devices in dam penstocks; these valves must be capable of closing if a penstock bursts. This paper summarizes a 3D CFD (Computational Fluid Dynamics) study that was conducted on the water flow across a sizable butterfly valve (1.6m in diameter) in a dam penstock with 57m of water head. The main aim is to determine the maximum torque required to close the valve. Thus semi steady flow conditions across the valve at various degrees of closure were investigated and the corresponding torque calculated. A maximum torque of about 87 700 N-m has been obtained, occurring at valve angle 40° (with valve totally closed at 0°, and fully open at 90°). Visual results were analyzed at each valve angle to understand the nature of the flow through the butterfly valve using various 2D contours and streamline images. The CFD software ANSYS Fluent has been used employing a Finite Volume Method. The RANS (Reynolds-Averaged Navier-Stokes) approach with Realizable K-epsilon turbulence model was employed. A grid independence study with up to 10 million cells has also been carried out, resulting in the adoption of 7.5 million cells in all models. Comparison with other available data was also completed, adding to the reliability of the computational results. Distribution of pressure, flow velocity, and turbulence parameters are also presented.

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Hashemi, Saeed, Hannah Mitchell, and William K. Durfee. "Experimentally Validated Models for Switching Energy of Low Pressure Drop Digital Valves for Lightweight Portable Hydraulic Robots." In ASME/BATH 2019 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/fpmc2019-1651.

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Abstract The most critical factors for a switching valve in a lightweight, portable hydraulic systems are low pressure drop, low power consumption, fast response time, and small size and weight. In this paper, experimentally validated models are proposed for switching energy required by two valve architectures with minimum pressure drop (ball and butterfly valves). The orifice in a hydraulic valve creates a pressure drop across the valve that needs to be minimized especially for low-pressure passive applications. The ideal switching valve for a hydraulic device is one with an opening diameter that is the same as the hose diameter. Several valve architectures with low pressure drop can be motorized to be used as a digital valve. The valve operation mechanism determines the power consumption of the valve. In this paper, the energy to switch state was modeled for two rotary valve types: butterfly and ball. The model was being used to find the best valve configuration for low-pressure digital hydraulics. The model was validated through experiments on a low-pressure ball valve, a high-pressure ball valve, and a low-pressure butterfly valve. The butterfly valve has the lowest switching energy for the same geometry; however, this valve has a small pressure drop due to the presence of the disc in the open position. We conclude that either ball or butterfly valves are suitable for low-pressure, small-scale hydraulic applications.

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Tebib, Safouane, Marlene Sanjose, Chaofan Zhang, Stephane Moreau, and Martin Brouillette. "Large Eddy Simulation of an Outflow butterfly valve." In AIAA AVIATION 2020 FORUM. American Institute of Aeronautics and Astronautics, 2020. http://dx.doi.org/10.2514/6.2020-2607.

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Song, Xueguan, Lin Wang, Youngchul Park, Nader Barsoum, Sermsak Uatrongjit, and Pandian Vasant. "FLUID AND STRUCTURAL ANALYSIS OF LARGE BUTTERFLY VALVE." In INTERNATIONAL CONFERENCE ON POWER CONTROL AND OPTIMIZATION: Innovation in Power Control for Optimal Industry. AIP, 2008. http://dx.doi.org/10.1063/1.3008687.

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Reports on the topic "Butterfly valve"

1

Meadows, J. B., G. E. Robbins, and D. G. Roselius. Large scale steam valve test: Performance testing of large butterfly valves and full scale high flowrate steam testing. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/188883.

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