Relevant bibliographies by topics / Pressure Valve

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Pressure Valve'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 February 2022

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Journal articles on the topic "Pressure Valve"

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Odend'hal, C. J. "MODIFIED BACK PRESSURE VALVE." Journal of the American Society for Naval Engineers 39, no. 4 (March 18, 2009): 702–6. http://dx.doi.org/10.1111/j.1559-3584.1927.tb04234.x.

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Bergsneider, Marvin, Isaac Yang, Xiao Hu, David L. McArthur, Shon W. Cook, and W. J. Boscardin. "Relationship between Valve Opening Pressure, Body Position, and Intracranial Pressure in Normal Pressure Hydrocephalus: Paradigm for Selection of Programmable Valve Pressure Setting." Neurosurgery 55, no. 4 (October 1, 2004): 851–59. http://dx.doi.org/10.1227/01.neu.0000137631.42164.b8.

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Abstract OBJECTIVE: There is little scientific basis for guidance in selecting the optimal valve for the treatment of normal pressure hydrocephalus. The aim of this study was to determine the programmable valve opening pressure setting that would result in a slight reduction in intracranial pressure (ICP) after a ventriculoperitoneal shunt is implanted. We also assessed whether shunt-induced ICP could be predicted on the basis of a simple hydrodynamic equation. METHODS: In this prospective study of 11 patients with normal pressure hydrocephalus, ICP was measured before and after implantation of a shunt incorporating a programmable valve without an antisiphon device. Pressure measurements, including intraperitoneal pressure, were recorded at body angles ranging from 0 to 55 degrees and at valve settings ranging from 30 to 200 mm H2O. Measured ICP values were compared with values computed using a simple hydrodynamic equation. RESULTS: Even at a valve setting greater than the mean baseline ICP (200 mm H2O), the supine ICP was significantly lower than the baseline value (baseline ICP, 164 ± 64 mm H2O; postoperative ICP, 125 ± 69 mm H2O, P = 0.04). Valve pressure did not equate 1:1 with the measured postoperative ICP. Comprehensive ICP measurements at upright body positions demonstrated a stepwise reduction in ICP rather than a precipitous decline as a result of so-called siphoning. CONCLUSION: This study indicates that very high valve opening pressure settings may be optimal for the initial treatment of normal pressure hydrocephalus. The relationship between ICP and opening pressure valves is linear but not predicted by simple hydrodynamics.
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Horton, Donald, and Michael Pollay. "Fluid flow performance of a new siphon-control device for ventricular shunts." Journal of Neurosurgery 72, no. 6 (June 1990): 926–32. http://dx.doi.org/10.3171/jns.1990.72.6.0926.

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✓ Most available cerebrospinal fluid diversion systems utilize differential-pressure valves that often induce overshunting, resulting in complications due to the siphoning of fluid from the ventricular system when the patient is in the erect position. A new siphon-control device (SCD) was tested alone and in combination with four types of differential-pressure valves with low, medium, and high opening pressures (namely PS Medical, Heyer-Schulte, Cordis-Hakim, and Codman valves). The valve inlet and outlet pressures were measured at several fluid inflow rates between 2.0 and 50.0 ml/hr. Inlet pressure and valve resistance were determined when the outlet pressures of the differential-pressure valve or SCD were varied between 0 and −60 cm H2O. Of the differential-pressures valves tested, none provided protection against siphoning without the distal connection of the SCD. The SCD allowed all differential-pressure valves tested to maintain atmospheric pressure regardless of the outlet pressure. The SCD performs in a manner similar to the older anti-siphon device, but with some improvements in design and construction. The results of this investigation suggest that the increased resistance due to the inline SCD is not functionally significant when added to the conventional valve systems with low opening pressure.
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Chaurasiya, Kanhaiya Lal, Bishakh Bhattacharya, AK Varma, and Sarthak Rastogi. "Dynamic modeling of a cabin pressure control system." Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 234, no. 2 (August 9, 2019): 401–15. http://dx.doi.org/10.1177/0954410019867578.

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Cabin pressure control system of an aircraft maintains cabin pressure in all flight modes as per the aircraft cabin pressurization characteristics by controlling the air flow from the cabin through the outflow valve of the cabin pressure control valve. The movement of outflow valve in turn depends on the air flow from the control chamber of cabin pressure control valve, which is controlled by the clapper and the poppet valves. These valves are actuated by absolute pressure and the differential pressure capsules, respectively depending upon the operating flight conditions. Mathematical models have been developed to simulate the air outflow rates from the cabin and the control chamber of cabin pressure control valve during steady-state and transient flight conditions. These mathematical models have then been translated into a MATLAB program to obtain plots of cabin pressures as a function of aircraft altitudes. The mathematical models are validated for standard cabin pressurization characteristics of a multirole light fighter/trainer aircraft. The model developed, thus can be used to produce a number of variants of cabin pressure control valve to suit different cabin pressurization characteristics.
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Zhang, Katherine Qinfen, Bryan W. Karney, and David L. McPherson. "Pressure-relief valve selection and transient pressure control." Journal - American Water Works Association 100, no. 8 (August 2008): 62–69. http://dx.doi.org/10.1002/j.1551-8833.2008.tb09700.x.

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Chakravarty, Tarun, Justin Cox, Yigal Abramowitz, Sharjeel Israr, Abhimanyu Uberoi, Sunghan Yoon, Damini Dey, Paya Zadeh, Wen Cheng, and Raj R. Makkar. "High-pressure post-dilation following transcatheter valve-in-valve implantation in small surgical valves." EuroIntervention 14, no. 2 (June 2018): 158–65. http://dx.doi.org/10.4244/eij-d-17-00563.

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Lee, Candice Y., Joshua K. Wong, Ronald E. Ross, David C. Liu, Kamal R. Khabbaz, Angelo J. Martellaro, Heather R. Gorea, Jude S. Sauer, and Peter A. Knight. "Prosthetic Aortic Valve Fixation Study: 48 Replacement Valves Analyzed Using Digital Pressure Mapping." Innovations: Technology and Techniques in Cardiothoracic and Vascular Surgery 11, no. 5 (September 2016): 327–36. http://dx.doi.org/10.1097/imi.0000000000000286.

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Objective Prostheses attachment is critical in aortic valve replacement surgery, yet reliable prosthetic security remains a challenge. Accurate techniques to analyze prosthetic fixation pressures may enable the use of fewer sutures while reducing the risk of paravalvular leaks (PVL). Methods Customized digital thin film pressure transducers were sutured between aortic annulus models and 21-mm bioprosthetic valves with 15 × 4-mm, 12 × 4-mm, or 9 × 6-mm-wide pledgeted mattress sutures. Simulating open and minimally invasive access, 4 surgeons, blinded to data acquisition, each secured 12 valves using manual knot-tying (hand-tied [HT] or knot-pusher [KP]) or automated titanium fasteners (TFs). Real-time pressure measurements and times were recorded. Two-dimensional (2D) and 3D pressure maps were generated for all valves. Pressures less than 80 mm Hg were considered at risk for PVL. Results Pressures under each knot (intrasuture) fell less than 80 mm Hg for 12 of 144 manual knots (5/144 HT, 7/144 KP) versus 0 of 288 TF (P < 0.001). Pressures outside adjacent sutures (extrasuture) were less than 80 mm Hg in 10 of 60 HT, zero of 60 KP, and zero of 120 TF sites for 15 × 4-mm valves; 17 of 48 HT, 25 of 48 KP, and 12 of 96 TF for 12 × 4-mm valves; and 15 of 36 HT, 17 of 36 KP and 9 and 72 TF for 9 × 6-mm valves; P < 0.001 all manual versus TF. Annular areas with pressures less than 80 mm Hg ranged from 0% of the sewing-ring area (all open TF) to 31% (12 × 4 mm, KP). The average time per manual knot, 46 seconds (HT, 31 seconds; KP, 61 seconds), was greater than TF, 14 seconds (P < 0.005). Conclusions Reduced operative times and PVL risk would fortify the advantages of surgical aortic valve replacement. This research encourages continued exploration of technical factors in optimizing prosthetic valve security.
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Suzuki, Katsuya, Ikuo Nakamura, and J. U. Thoma. "Pressure regulator valve by Bondgraph." Simulation Practice and Theory 7, no. 5-6 (December 1999): 603–11. http://dx.doi.org/10.1016/s0928-4869(99)00024-5.

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Gassmann, Stefan, and Lienhard Pagel. "Magnetic actuated pressure relief valve." Sensors and Actuators A: Physical 194 (May 2013): 106–11. http://dx.doi.org/10.1016/j.sna.2012.12.033.

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Stewart, J. T., H. H. Gray, and D. R. Redwood. "MITRAL VALVE AND WEDGE PRESSURE." Lancet 334, no. 8665 (September 1989): 742. http://dx.doi.org/10.1016/s0140-6736(89)90802-7.

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Dissertations / Theses on the topic "Pressure Valve"

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Ogden, Sam. "High-Pressure Microfluidics." Doctoral thesis, Uppsala universitet, Mikrosystemteknik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-208915.

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In this thesis, some fundamentals and possible applications of high-pressure microfluidics have been explored. Furthermore, handling fluids at high pressures has been addressed, specifically by creating and characterizing strong microvalves and pumps. A variety of microstructuring techniques was used to realize these microfluidic devices, e.g., etching, lithography, and bonding. To be able to handle high pressures, the valves and pumps need to be strong. This necessitates a strong actuator material. In this thesis, the material of choice is paraffin wax. A new way of latching paraffin-actuated microvalves into either closed or open position has been developed, using the low thermal conductivity of paraffin to create large thermal gradients within a microactuator. This allows for long open and closed times without power consumption. In addition, three types of paraffin-actuated pumps are presented: A peristaltic high-pressure pump with integrated temperature control, a microdispensing pump with high repeatability, and a pump system with two pumps working with an offset to reduce flow irregularities. Furthermore, the fundamental behavior of paraffin as a microactuator material has been explored by finite element modeling. One possibility that arises with high-pressure microfluidics, is the utilization of supercritical fluids for different applications. The unique combination of material properties found in supercritical fluids yields them interesting applications in, e.g., extraction and cleaning. In an attempt to understand the microfluidic behavior of supercritical carbon dioxide, the two-phase flow, with liquid water as the second phase, in a microchannel has been studied and mapped with respect to both flow regime and droplet behavior at a bi-furcating outlet.
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Gomez, Nicasio. "PCV valve flutter : vibration characterization through pressure and flow." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/32895.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2005.
Includes bibliographical references (p. 51).
A Positive Crankcase Ventilation, or PCV, valve is required by internal combustion engines in order to regulate the flow of blow-by gases out of the crankcase and into the intake air stream. Fluctuations in the pressure and flow of these gases lead to poor performance and can be detrimental to engine durability. This thesis addresses a specific case of PCV valve component vibration, or flutter, which in certain conditions has been severe enough to be perceived by the customer. Tests monitoring pressure and flow were performed in a variety of test setups in order to simulate every real-world scenario possible at the bench level. Data attained was analyzed in order to identify and characterize any and all patterns in pressure and flow indicative of flutter conditions. The end result of this thesis is summarized in a recommended test procedure to be followed in future cases of PCV valve flutter.
by Nicasio Gomez, III.
S.B.
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Ozkan, Tulay. "Leakage Control By Optimal Valve Operation." Phd thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609419/index.pdf.

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The main function of a water distribution system is to supply water in sufficient quantity at appropriate pressure with an acceptable quality and as economically as possible. Water leakage in distribution networks may account from 5% to 50% and even larger of the total water delivered. The amount of leakage in a network is directly related to system service pressure. Therefore, reductions in high service pressures will result in considerable reductions in leakage. A methodology for leakage reduction has been presented in context of a developed computer program, LEAKSOL with two sub-programs. The first code, CODE I, provides solution by using optimization techniques with defined pressure-leakage and pressure-demand relations in order to find optimal flow control valve settings minimizing water leakage. The second one, CODE II, makes hydraulic analysis of the network in order to solve the system and to compute the amount of leakage and the amount of water consumed, by using different combinations of isolation valves generated according to the number of valves given and employing the relationships among pressure, leakage and consumption. Computer program application was performed for different scenarios in a sample network previously used in literature and also in N8-3 pressure zone of Ankara Municipal Water Supply System. Leakage reduction up to 10 % has been achieved in N8-3 pressure zone for eight valves located at the entrances of sub-zones, depending on the defined pressure-leakage relationship.
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Huang, Jiahai, Long Quan, and Youshan Gao. "Characteristics of Proportional Flow Control Poppet Valve with Pilot Pressure Compensation." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199471.

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Electro-hydraulic proportional flow valves are widely used in hydraulic industry. There are several different structures and working principles. However, flow valves based on the existing principles usually have some shortcomings such as the complexity of the system and additional energy losses. A concept for a two-stage poppet flow valve with pilot pressure drop – pilot spool opening compensation is presented, and the linear relationship between the pilot stage and main stage, the semi-empirical flow equation are used in the electronic flow controller. To achieve the accurate control of the outlet flow, the actual input voltage of the pilot spool valve is regulated according to the actual pilot pressure drop, the desired flow rate and the given input voltage. The results show that the pilot pressure drop – pilot spool opening compensation method is feasible, and the proposed proportional flow control valve with this compensation method has a good static and dynamic performance.
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Ritchie, Greg. "Minimizing pressure relief valve seat leakage through optimization of design parameters." Thesis, Massachusetts Institute of Technology, 1989. http://hdl.handle.net/1721.1/31013.

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Nasr, Ahmed. "Computational and experimental studies of flow through a plate valve." Thesis, University of Strathclyde, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243954.

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CARNEIRO, LEONARDO MOTTA. "STUDY OF THE DYNAMIC BEHAVIOR OF SPRING PRESSURE RELIEF VALVE FOR PIPELINES." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2011. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=21693@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
A grande maioria dos dutos de transporte de petróleo e derivados no Brasil trabalha com válvulas de alívio no projeto dos seus sistemas de proteção. Desta forma, o perfeito dimensionamento e funcionamento destas válvulas são fundamentais para garantir a segurança de dutos de transporte e dos terminais de carga e descarga, caso haja alguma condição anormal de operação que gere sobrepressões. Estas válvulas aliviam a pressão interna do duto caso a mesma ultrapasse um valor definido e calibrado na válvula. Simplificadamente, a válvula de alívio de pressão tipo mola possui um disco o qual é pressionado pela mola contra o bocal de entrada. Quando a pressão do duto se eleva, a força gerada na superfície do disco aumenta e, dependendo do ponto de ajuste da mola, supera a força exercida pela mesma fazendo com que o disco se eleve, descarregando pelo bocal de saída o fluido para o tanque de alívio e, consequentemente, reduzindo a pressão no duto. Desta forma, a válvula de alívio garante que o duto não seja submetido a pressões superiores às pressões de projeto, o que poderia levar a uma falha do duto e a um possível vazamento de produto para meio ambiente. Este trabalho propõe um estudo experimental e numérico para determinar o comportamento dinâmico de válvulas de alívio de mola. Foi realizada a montagem de uma bancada experimental com um circuito de água contendo uma bomba, uma válvula de alívio e uma válvula de bloqueio capaz de interromper o fluxo no circuito gerando um transiente de pressão que obriga a abertura da válvula para aliviar a pressão interna no sistema. A válvula de alívio foi instrumentada para medir as grandezas necessárias para estudar o comportamento dinâmico da válvula e os transientes de pressão e vazão gerados no duto. Os resultados experimentais foram comparados com os resultados obtidos de modelos computacionais proporcionando o aperfeiçoamento e validação destes modelos.
The majority of oil and refined product pipelines in Brazil employ pressure relief valves in the design of their protection system. Thus, the perfect design and operation of these valves is essential to ensure the safety of transport pipelines and loading and unloading terminals, under any abnormal condition of operation that generates overpressures. These valves work by relieving the internal pressure in case it exceeds a pre-set and calibrated value. In a nutshell, the spring-type pressure relief valve has a disk which is pressed by a spring against the inlet nozzle of the valve. When the pressure rises, the force generated on the surface of the disc increases and, depending on the pressure relief valve set point, the pressure force overcomes the force exerted by the spring, causing the disk to rise and thus discharging the fluid through the outlet nozzle to the relief tank, consequently reducing the pressure in the pipeline. Using this principle, the relief valve ensures that the pipeline is not subjected to high transient pressures, which could lead to pipeline or equipment rupture and possible product leak. The present dissertation describes a numerical and experimental study conducted to determine the dynamic behavior of spring-type relief valves. The experiments were conducted in a water pipe loop equipped a pump, a block valve to generate the pressure transients and a commercial spring-type pressure relief valve. The loop was instrumented with pressure, flow and temperature transducers. The relief valve was instrumented to measure the variables necessary to study the dynamic behavior of the valve and the transient pressure and flow generated in the pipeline. The experimental results were compared with results obtained from computer models allowing the improvement and validation of these models.
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PÉREZ, MARCOS JOSÉ BABILONIA. "STUDY OF THE DYNAMIC BEHAVIOR OF A SPRING-TYPE PRESSURE RELIEF VALVE." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2016. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=28093@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO
COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE EXCELENCIA ACADEMICA
As válvulas de alívio de pressão (PRVs, do inglês, pressure relief valves) são dispositivos fundamentais para a segurança de operações em dutos de transporte de fluidos, sendo encarregadas de garantir a integridade das instalações no caso de algum bloqueio súbito do escoamento. Dependendo da natureza e duração do evento de bloqueio, das características da válvula de alívio e do comprimento do duto, o comportamento dinâmico da PRV, i.e., seu tempo de resposta e o coeficiente de descarga em função da abertura, podem variar consideravelmente. Estas informações mais detalhadas sobre o comportamento transiente da válvula não são especificadas em normas e raramente são disponibilizadas pelos fabricantes. Uma caracterização detalhada do comportamento dinâmico da válvula de alívio é informação importante para a simulação computacional de transientes hidráulicos em dutos de líquido. Em particular, o comportamento dinâmico do coeficiente de descarga da válvula não é conhecido, sendo por vezes simplificadamente representado por dados obtidos em condições de regime permanente. No presente trabalho foi realizado um estudo detalhado do comportamento dinâmico de um modelo de válvula de alívio, com o objetivo de obter informações comparativas sobre o comportamento do coeficiente de descarga da válvula quando investigada sob condições de regime permanente e transiente rápido. Para isso, construiu-se um modelo de PRV transparente, permitindo a medição de campos instantâneos de escoamento em seu interior com a técnica de Velocimetria por Imagem de Partículas em duas dimensões (PIV). Transdutores de pressão e deslocamento foram devidamente instalados de maneira a fornecer informações instantâneas sobre a queda de pressão e posição de abertura da válvula, com alta resolução temporal. O modelo da válvula transparente foi montado em um circuito fechado, no qual água era bombeada através de uma tubulação longa, passando pela PRV e por uma válvula de bloqueio com tempo de fechamento controlado eletronicamente, podendo produzir bloqueios súbitos no escoamento, com tempos na faixa de 4 ms a 3,5 s. Sistemas de controle foram especialmente desenvolvidos para sincronizar os eventos de bloqueio da válvula, disparo do laser do sistema PIV, aquisição de imagens e dados de pressão e deslocamento. Estes dados permitiram a determinação do valor instantâneo e de média de fase para o coeficiente de descarga da válvula de alívio de pressão no caso transiente.
Pressure relief valves (PRVs) are important devices which guarantee the safe operation of liquid pipelines, being responsible for preserving the integrity of the duct in case a sudden flow blockage event occurs. The PRV s dynamic behavior, that is, its response time and discharge coefficient as a function of open fraction, can vary considerably depending on the nature and duration of the blockage event, on the valve s characteristics and on the duct length. This more detailed information on the valve s transient behavior is not specified in standards and is rarely made available by valve manufacturers. A detailed characterization of the valve s dynamic behavior is relevant information for the computational simulation of hydraulic transients in liquid pipelines. In particular, the dynamic behavior of the valve discharge coefficient is not known, being normally replaced by data obtained from tests under steady state conditions. In the present work, a detailed study was conducted using a valve model with the objective of obtaining comparative information on the valve discharge coefficient for steady and transient conditions. To this end, a transparent PRV model was constructed in order to allow for the use of the two-dimensional Particle Image Velocimetry technique (PIV) for measuring the instantaneous flow field inside the valve. Pressure and displacement transducers were employed to yield instantaneous information on the pressure drop and valve opening. The valve model was installed in a closed circuit where water was pumped through a long pipe, passing through the PRV and through the blockage valve that was capable of producing flow blockage events in the range of 4 ms to 3.5 s. Control systems were specially constructed to synchronize the events of valve blockage, PIV laser firing, and acquisition of pressure, and displacement data. These data allowed the determination of the instantaneous and phase-averaged values for the valve discharge coefficient.
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McGregor, Brian. "The left ventricle, aortic valve, and arterial tree - a fresh engineering perspective." Thesis, University of Ulster, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.339346.

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Brubaker, Christopher L. "Dynamic Model of a Non-Linear Pneumatic Pressure Modulating Valve Using Bond Graphs." Cleveland State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=csu1432264539.

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Books on the topic "Pressure Valve"

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

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Ridgely, J. N. Resolution of Generic Issue C-8: An evaluation of boiling water reactor main stream isolation valve leakage and the effectiveness of leakage treatment methods. Washington, DC: Division of Boiling Water Reactor Licensing, Office of Nuclear Reactor Regulation, U.S. Nuclear Regulatory Commission, 1986.

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Graves, C. C. Regulatory analysis for the resolution of generic issue C-8, "main steam isolation valve leakage and LCS failure". Washington, DC: Division of Safety Issue Resolution, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1990.

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Symposium on ASME Codes and Recent Advances in PVP and Valve Technology Including a Survey of Operations Research Methods in Engineering (1986 Chicago, Ill.). Symposium On ASME Codes and Recent Advances in PVP and Valve Technology Including a Survey of Operations Research Methods in Engineering: Presented at the 1986 Pressure Vessels and Piping Conference and Exhibition, Chicago, Illinois, July 20-24, 1986. Edited by Fong J. T. 1934-, American Society of Mechanical Engineers. Codes and Standards Liaison Subcommittee., and Pressure Vessels and Piping Conference (1986 : Chicago, Ill.). New York, N.Y. (345 E. 47th St., New York 10017): American Society of Mechanical Engineers, 1986.

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American Petroleum Institute. Refining Dept. Seat tightness of pressure relief valves. 3rd ed. Washington, D.C. (1220 L St., NW, Washington 20005): American Petroleum Institute, 1991.

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Pressure relief devices: ASME and API code simplified. New York: McGraw-Hill, 2006.

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Staunton, R. H. Aging and service wear of spring-loaded pressure relief valves used in safety-related systems at nuclear power plants. Washington, DC: U.S. Nuclear Regulatory Commission, 1995.

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Rolander, Nathan. Materials investigation of thermal triggers used in pressure relief devices on transit buses. Washington, D.C: Federal Transit Administration, 2003.

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National Board of Boiler and Pressure Vessel Inspectors. National board VR® repair symbol administrative rules and procedures: Repair of ASME and national board stamped pressure relief valves. Columbus, Ohio (1055 Crupper Ave., Columbus 43229): National Board of Boiler and Pressure Vessel Inspectors, 1985.

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Martin, C. N. B. Effects of upstream bends and valves on orifice plate pressure distributions and discharge coefficients. Glasgow: National Engineering Laboratory, 1986.

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Book chapters on the topic "Pressure Valve"

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Yin, Yaobao. "Ultra-High-Pressure Pneumatic Pressure Reducing Valve." In High Speed Pneumatic Theory and Technology Volume I, 323–60. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-5986-6_7.

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Trost, H. A., Ch Sprung, W. Lanksch, D. Stolke, and C. Miethke. "Dual-Switch Valve: Clinical Performance of a New Hydrocephalus Valve." In Intracranial Pressure and Neuromonitoring in Brain Injury, 360–63. Vienna: Springer Vienna, 1998. http://dx.doi.org/10.1007/978-3-7091-6475-4_104.

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Itoh, Kaoru, Mitsunori Matsumae, Ryuichi Tsugane, and Osamu Sato. "The Shunt Flow in Programmable Pressure Valve." In Annual Review of Hydrocephalus, 64–65. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-662-11158-1_37.

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Duijnhouwer, Anthonie L., and Arie P. J. van Dijk. "Echocardiographic Assessment of Pulmonary Artery Pressure, Tips and Tricks." In Practical Manual of Tricuspid Valve Diseases, 235–51. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-58229-0_12.

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Foster, P. A. "Two Applications of a Differential Pressure Valve in Anaesthesia." In Anaesthesia — Innovations in Management, 67–70. Berlin, Heidelberg: Springer Berlin Heidelberg, 1985. http://dx.doi.org/10.1007/978-3-642-82392-3_14.

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Fuse, Takahisa, Takuji Takagi, Masahiro Ohno, and Hajime Nagai. "Experiences of Shunt Operation with Programmable Pressure Valve in Infants." In Annual Review of Hydrocephalus, 83. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-662-11155-0_55.

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Sydorenko, Ihor, Inna Sinko, and Yiheng Zhang. "Characteristics of Pressure Passive Reduction Valve with Mechanical Control System." In Lecture Notes in Mechanical Engineering, 608–15. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-40724-7_62.

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Rajamannan, Nalini M. "Application of the LDL-Density-Pressure Theory: The Mitral Valve." In Molecular Biology of Valvular Heart Disease, 131–38. London: Springer London, 2014. http://dx.doi.org/10.1007/978-1-4471-6350-3_16.

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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, 269–75. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-13-9524-6_29.

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Doghri, Mouna, Sophie Duchesne, Annie Poulin, and Maxim Ouellet. "Comparative Study of Pressure Reduction Valve Controllers in Water Distribution Systems." In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions, 1001–3. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70548-4_289.

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Conference papers on the topic "Pressure Valve"

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Bagagli, Riccardo, Alessio Capanni, Carmelo Maggi, and Leonardo Tognarelli. "Advances in Hypercompressor Valve and Valve Spring Design." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78472.

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The life of valves is extremely important for the availability of hyper-compressors in LDPE plants. The valves operate due to the action of the differential pressure across a moving element, typically with a poppet shape, and close due to the action of dedicated counteracting springs housed into the same valves. A proper design of the spring is a balance between ensuring the “on time” opening/closure of the valve, a low impact velocity of the poppet and low fluttering. Particular attention shall be paid to the dynamic behavior avoiding to excite the spring and poppet-spring system close to themselves resonance frequencies. Different factors such unexpected transient conditions or vortex shedding phenomena could shorten the life of valves springs and valves bodies, since the valve spring is forced to operate out of the design conditions. A compressor application presenting evidence of spring surge phenomena (resonance of spring itself) is presented. Frequencies exciting spring natural modes frequencies can be introduced in the process gas by vortex shedding generated along the gas outflow through the valve during the transient conditions or in regime conditions. Since the vortex shedding frequency predictability is affected by some bias inaccuracy level coming from process variability and model approximation, then a robust design approach is to employ progressive spring that is insensitive to surge phenomena. This paper gives an overview of progressive and non-linear springs and the benefits they offer compared to linear springs and how progressive springs has to be designed for hyper-compressor valves application. Several spring designs are analyzed with a simplified prediction model, the results (load deflection, stiffness, natural frequencies, fatigue lives) are then compared with finite element analysis and bench tests results using a specifically developed test bench allowing to measure spring natural frequencies and to conduct accelerated fatigue testing.
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Reich, Alton. "Relief Valve Impact Analysis." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21063.

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Abstract In nuclear power plants power actuated pressure relief valves serve several purposes. They act as safety valves and open automatically in response to unusually high pressures in the primary system. They also act as power operated valves and are used to relieve steam in response to automatic or manually initiated control signals. These valves are required to lift completely over a short duration from the time that they receive an actuation signal, or the system pressure exceeds the set point. This short lift time results in the valve disk moving at high velocities, and can result in high impact forces on the piston and stem when the valve fully opens. In order to evaluate and improve the performance of a two-stage power actuated relief valve, an analysis was performed to calculate the impact force on the main disk piston when it opened and the resulting stresses. The analysis was based on the main disk piston velocity measured during valve testing. Of particular interest were the stresses in the threaded connection between the stem and the main disk piston.
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Chabane, Saïd, François Corbin, Anthony Couzinet, Daniel Pierrat, and Martin Bayart. "Experimental Incompressible Forces Applied in a Safety Valve." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78129.

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Safety valves are crucial devices in the industry. Indeed, these valves are simple and robust in their design. Safety valves are the ultimate overpressure device protection when all other devices are insufficient or failed. The poor design of these devices can be disastrous. A conventional safety relief valve is mainly composed of a disk maintained pressed against a nozzle by a spring. When the pressure forces on the upstream face of the disk are below the force applied to the spring, the valve is closed. If an accidental overpressure event occurs in the process under protection, the pressure forces become high compared to spring elastic forces and the safety valve opens to relief pressure. Thus, the pressure in the process under protection is reduced to an acceptable value. The force exerted by the pressure on a disk of a safety valve is essential for a correct design of the spring and the inner ring. To understand the forces, a safety relief valve was modified and the spring removed; a force measurement tool was mounted in order to measure the forces exerted at different inlet pressure and lift. These tests were made for several ring settings. These measurements were made in incompressible fluid on a water test loop. Finally, inlet and outlet conditions of the safety valves were modeled respectively by thermodynamic 1D-model. The safety valve is described by dynamic 1D-model where the hydrodynamics forces applied to the moving disk are provided by measurements in water.
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Veiga, Jose´ C., Carlos Cipolatti, Carlos Gira˜o, Leandro Ascenco, and Fabio Castro. "Valve Packings Seating Stress." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61214.

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This paper studies the seating stress required to assure the sealability in valve stems used in high pressure steam service. A test device that simulates the valve stuffing box and a test protocol are proposed. Actual field tests conducted according to a procedure developed from the laboratory tests are also reported.
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Porter, Michael A., Dennis Martens, Ramesh Harrylal, and Charles Henley. "Valve-Induced Piping Vibration." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57391.

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While going through the startup process of a 600MMSCFD Gas Processing Plant, the piping downstream of a gas expander bypass valve and supporting structure was observed to be shaking abnormally. The shaking was significant enough that plant personnel limited the valve flow rate to well under the design capacity and at a level that limited the plant startup. The initial assumption was that the piping or the piping supports had been improperly designed. An investigation revealed no unusual looseness in the piping supports and no significant piping natural frequency at the observed vibration frequency. Further investigation revealed that the root cause of the problem was a flow-generated pulsation in the discharge of the bypass valve that excited the piping and structural supports. Changing the valve flow path and applied valve opening limits provided a temporary work-around that allowed the plant to operate at sufficient flow rates to complete the startup. Subsequent replacement of the valve with one using the same trim but with different gas flow path characteristics proved to be the ultimate solution to the problem.
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Slavík, Petr, Blanka Skočilasová, Josef Soukup, and František Klimenda. "Low pressure EGR valve testing." In 38TH MEETING OF DEPARTMENTS OF FLUID MECHANICS AND THERMODYNAMICS. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5114768.

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Kourakos, Vasilios, Sai¨d Chabane, Patrick Rambaud, and Jean-Marie Buchlin. "Flowforce in Safety Relief Valve Under Incompressible, Compressible and Two-Phase Flow Conditions." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57896.

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The use of relief valves is crucial for the safety of power plants. Indeed, these simple and robust in their design valves are the ultimate protection when all other systems are insufficient. This study is focused on valve opening characteristics which can be concluded through the determination of flowforces applied at the valve disk. A spring loaded safety relief valve (1 1/2″ G 3″) and transparent model of this valve are tested under static conditions. The spring is removed and the forces exerted at the valve disk for different inlet pressures and lift positions are measured. Compressible, incompressible and two-phase flow behaviors are investigated and compared. Inversed force of air and water is noticed above a certain value of valve lift. Numerical simulations are performed to verify experimental findings.
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Josodipuro, Irawan. "Development of Valve Performance Qualification Methodology and Testing." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21835.

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Abstract Valves play important roles in piping systems. In the oil and gas industry, for example, they are used to control flow rates in pipes, isolate flow, and provide over pressure protection of equipment. Given the role of valves in process industries, it is important that valve end-users feel confident that the valves they procure meet the design and qualification requirements in the specification. This paper presents a case study where there have been breakdowns in the qualification of valves being offered by valve suppliers to the industry that did not comply with industry standards which can adversely impact plant operations and personnel safety. The loss of valve supplier credibility is a concern that rarely occurs in mature economies but seem to be more prevalent in countries where design and testing standards are either relatively new or non-existent. To address this issue, the author presents a systematic approach that can be used to ensure that valves supplied to end-users in oil and gas industries in emerging countries meet the design requirements and standards they are required to meet. The process used to control the manufacturers begins with a qualification plan which each supplier has to establish for its product line. Following compliance with the qualification plan, a valve type criticality matrix is introduced to the manufacturers that classifies the criticality of each valve in the system and the associated testing program(s) that the manufacturers need to meet. The qualification program is conducted by the national oil and gas company and acknowledged by the country’s regulator. The recently established program has shown some merit and could be applied to all manufacturers in emerging countries to ensure consistency. The details of the qualification program used and how the process is evaluated are covered in the body of the paper together with examples of how the process has worked.
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Farrell, Ronald, and L. Ike Ezekoye. "Valve Modeling Methods for Modal Analysis." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93904.

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Abstract This paper presents several modeling methods for performing a valve assembly modal analysis. It discusses the background of the methods, their strengths and limitations, and then introduces a new approach that can be used in performing valve modal analysis. An early paper presents a classical approach based on a lumped mass model and the Rayleigh energy principal to determine primary mode natural frequencies. A follow up paper reaffirms the classical method and introduces enhancements. A recent paper provides a comparative study of the classical approach, laboratory testing, and solid modeling results using the finite element analysis program ANSYS Mechanical. In this paper, a third approach is presented, which is an extension of the classical method, where 3-D beam-based geometry is defined using the ANSYS SpaceClaim program that is then ported to ANSYS Mechanical. The classical and solid modeling approaches from the previously cited papers are reviewed to highlight the modeling evolution and then the newly developed approach is presented. An example is presented that compares natural frequency results of the new method and the previous methods. The motivation for the new method is to provide better compatibility with 3-D piping system models, which are typically used to study the effect of valve mass and stiffness on system response without the complexity of a solid model or the difficulty of communicating the details of a classical model to the system modeler. Much of the process of creating a 3-D beam model is automated. It uses input from an existing classical model and employs the following ANSYS software packages: SpaceClaim, Workbench, Mechanical, and ACT. A great feature of the resulting 3-D model is that beam geometry is more realistic to scale, and therefore provides valuable user feedback for checking model validity. This approach is an improvement over the classical model where only manual data input validation is possible. Other benefits of the new method are covered in greater detail in the paper.
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Koyabu, Eitaro, Tetsuhiro Tsukiji, Yoshito Matsumura, and Taizo Sato. "Study on Improvement of the Suction Valve Using PIV Technique." In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71080.

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The simplified test model of the commercial reciprocating compressor for an automotive air-conditioner is used to measure the displacement of the suction valves using a strain gauge and to investigate the velocity distributions of the discharge flow from the valves using the particle image velocimetry system. This paper is focused on the effects of shape of the suction valve on the vibration-reduction. The size of the suction valve hole and the width of the tip of the suction valve are changed as main parameters of the valve shape. First, the size of the conventional valve hole and the width of the tip of the conventional valve are changed and seven new valves are manufactured to reduce the vibration of the valve. Consequently, it is found that one shape of the new valves is the most effective for the vibration-reduction. Next, the influence of the natural frequency on the vibration-reduction is investigated using one shape of the new valves by changing the material and the thickness of the valve. In addition, the relation between the conventional valve and the new valves are also estimated by the pressure loss. Finally, the reason of the vibration-reduction for one shape of the new valves is discussed from the results of the flow analysis around the valve. The vibration-reduction for one shape of the new valves is confirmed by measurement of the displacement of the valve in the reciprocating compressor for the automotive air-conditioner.
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Reports on the topic "Pressure Valve"

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Blaedel, K. L. Glovebox pressure relief and check valve. Office of Scientific and Technical Information (OSTI), March 1986. http://dx.doi.org/10.2172/5395402.

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Brown, E. J. Workshop on gate valve pressure locking and thermal binding. Office of Scientific and Technical Information (OSTI), July 1995. http://dx.doi.org/10.2172/95199.

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Zuo, Xiqing, Guowen Liu, Shouli Zhang, Sheng Li, and Jian Ruan. Design and Characteristics Analysis of Bourdon Tube Pressure Feedback for 2D Pressure Servo Valve. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, January 2018. http://dx.doi.org/10.7546/crabs.2018.01.13.

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Zuo, Xiqing, Guowen Liu, Shouli Zhang, Sheng Li, and Jian Ruan. Design and Characteristics Analysis of Bourdon Tube Pressure Feedback for 2D Pressure Servo Valve. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, January 2018. http://dx.doi.org/10.7546/grabs2018.1.13.

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Osswald, Sandra, Victor A. Convertino, and F. A. Gaffney. Effect of Lower Body Negative Pressure on Mitral Valve Movement. Fort Belvoir, VA: Defense Technical Information Center, September 1998. http://dx.doi.org/10.21236/ada354386.

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Tokuo, Kenichiro, Kenji Hiraku, and Hiroyuki Yamada. Integration of Magnetic Solenoid Valve Model Into High-Pressure Fuel Pump Simulator and Its Application. Warrendale, PA: SAE International, May 2005. http://dx.doi.org/10.4271/2005-08-0013.

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Bontha, Jagannadha R., Nancy G. Colton, Eric A. Daymo, T. D. Hylton, C. K. Bayne, and T. H. May. Qualification of the Lasentec M600P Particle Size Analyzer and the Red Valve Model 1151 Pressure Sensor. Office of Scientific and Technical Information (OSTI), January 2000. http://dx.doi.org/10.2172/15002697.

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JR Bontha, NG Colton, EA Daymo, TD Hylton, CK Bayne, and TH May. Qualification of the Lasentec M600P Particle Size Analyzer and the Red Valve Model 1151 Pressure Sensor. Office of Scientific and Technical Information (OSTI), January 2000. http://dx.doi.org/10.2172/750437.

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Harold Schock, Farhad Jaberi, Ahmed Naguib, Guoming Zhu, and David Hung. High-Compression-Ratio; Atkinson-Cycle Engine Using Low-Pressure Direct Injection and Pneumatic-Electronic Valve Actuation Enabled by Ionization Current and Foward-Backward Mass Air Flow Sensor Feedback. Office of Scientific and Technical Information (OSTI), December 2007. http://dx.doi.org/10.2172/967307.

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DeWall, K. G., J. C. Watkins, M. G. McKellar, and D. Bramwell. Results of pressure locking and thermal binding tests of gate valves. Office of Scientific and Technical Information (OSTI), May 1998. http://dx.doi.org/10.2172/654182.

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