Relevant bibliographies by topics / On/off 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 'On/off valve'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "On/off valve"

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Schreiber, Christian, and Rüdiger Lange. "Off-pump pulmonary valve implantation." Journal of Thoracic and Cardiovascular Surgery 132, no. 4 (2006): 990. http://dx.doi.org/10.1016/j.jtcvs.2006.06.024.

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Amin, Zahid. "Off-pump pulmonary valve placement." Journal of Thoracic and Cardiovascular Surgery 132, no. 5 (2006): 1245–46. http://dx.doi.org/10.1016/j.jtcvs.2006.06.038.

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Heightman, A. J. "A Critical Shut-Off Valve." JEMS: Journal of Emergency Medical Services 33, no. 8 (2008): 20. http://dx.doi.org/10.1016/s0197-2510(08)70276-6.

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Ustunsoy, Hasim, Mehmet Adnan Celkan, Oktay Burma, Hakkı Kazaz, and Osman Baspinar. "Off-Pump Pulmonary Valve Implantation." Journal of Cardiac Surgery 23, no. 5 (2008): 464–67. http://dx.doi.org/10.1111/j.1540-8191.2008.00598.x.

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Ma, Liang, Piergiorgio Tozzi, Christoph H. Huber, Steven Taub, Gabrielle Gerelle, and Ludwig K. von Segesser. "Double-crowned valved stents for off-pump mitral valve replacement☆." European Journal of Cardio-Thoracic Surgery 28, no. 2 (2005): 194–98. http://dx.doi.org/10.1016/j.ejcts.2004.12.068.

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Olsthoorn, Jules R., Samuel Heuts, Jean Daemen, Jos Maessen, and Peyman Sardari Nia. "Transapical off-pump mitral valve repair." ASVIDE 6 (June 2019): 180. http://dx.doi.org/10.21037/asvide.2019.180.

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Ivanov, V. V., A. V. Oleinikov, D. S. Denisevich, and B. G. Pektimirov. "Emergency Shut-Off Valve for Pipelines." Chemical and Petroleum Engineering 49, no. 5-6 (2013): 400–402. http://dx.doi.org/10.1007/s10556-013-9763-z.

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Lutter, Georg, René Quaden, Satoru Osaki, et al. "Off-pump transapical mitral valve replacement☆." European Journal of Cardio-Thoracic Surgery 36, no. 1 (2009): 124–28. http://dx.doi.org/10.1016/j.ejcts.2009.02.037.

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Walther, Thomas, Jörg Kempfert, Michael A. Borger, et al. "Human Minimally Invasive Off-Pump Valve-in-a-Valve Implantation." Annals of Thoracic Surgery 85, no. 3 (2008): 1072–73. http://dx.doi.org/10.1016/j.athoracsur.2007.12.040.

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Siivonen, Lauri, Matti Linjama, Mikko Huova, and Matti Vilenius. "Jammed on/off Valve Fault Compensation with Distributed Digital Valve System." International Journal of Fluid Power 10, no. 2 (2009): 73–82. http://dx.doi.org/10.1080/14399776.2009.10780979.

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Dissertations / Theses on the topic "On/off valve"

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Katz, Allan A. "Design of a high speed hydraulic On/Off valve." Worcester, Mass. Worcester Polytechnic Institute, 2009. http://www.wpi.edu/Pubs/ETD/Available/etd-052909-155248/.

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Thesis (M.S.)--Worcester Polytechnic Institute.<br>Keywords: high speed hydraulic valve; switch-mode control; On/Off valve; phase controlled duty ratio. Includes bibliographical references (leaf 80-81).
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Håkansson, Klas, and Mikael Johansson. "Modeling and Control of an Electro-Pneumatic Actuator System Using On/Off Valves." Thesis, Linköping University, Department of Electrical Engineering, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-8754.

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<p>To control the exhaust gas recirculation (EGR) and the exhaust brake, the position of a butterfly valve connected to a piston inside a pneumatic cylinder is controlled by altering the pressure inside the cylinder. This thesis evaluates the possibility to do this with pulse width modulation (PWM) controlled On/Off valves. The whole electro-pneumatic actuator system is built out of two On/Off valves and a cylinder.</p><p>A mathematical model of the system is constructed. The complete system model on state space form consists of nine states and is nonlinear. The model captures the dynamics of the system. The statics of the system is not captured as accurately. The model is still good enough to be used as aid when developing control strategies, since position feedback is available.</p><p>Automatic control strategies for the system are first developed and tested in simulation. The first approach is PID control. Because of the nonlinear properties of the system the results from a PID with a constant proportional part is unsatisfactory. To cope with the nonlinearities, a fuzzy controller is constructed; the results prove somewhat better, but not as good as expected due to implementation difficulties.</p><p>In a test bench the system is controlled by a P controller with feedforward from position. The feedforward strongly reduces the nonlinear behavior of the system. With this implementation the results that were hoped for with the fuzzy controller are reached.</p>
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Garrity, Jordan, Farid Breidi, and John Lumkes. "Design of a High Performance Energy Coupling Actuated Valve (ECAV)." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-200732.

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Most commercially available valves are able to produce a large flow rate or a fast response, but are incapable of producing both simultaneously. Commercially available valves that can achieve both are expensive as they require multiple stages of actuation and piloting pressures to deliver large flow rates quickly, preventing them from being broadly used in fluid power applications. This work investigates the design of an Energy Coupling Actuated Valve (ECAV) that is capable of solving this trade-off between large flow and fast switching times through the use of an innovative, high performance actuation system. The ECAV is a new development in valve technology in the area of hydraulic, high speed, proportional and digital on/off valves. High speed actuation is produced through the intermittent coupling of a kinetic energy source with a translational poppet or spool. This coupling process occurs through the use of magnetorheological fluid and a controlled magnetic flux through the fluid in the energy coupler. The ECAV has several design advantages including proportional force control and a large (7mm) stroke capability. Early results predict a nominal flow rate of 100 L/min at a 5 bar pressure drop can be achieved with a 3 ms on/off response time.
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Nyawo, Talent. "Design of a rotary valve for pressurised steam." Thesis, KTH, Maskinkonstruktion (Inst.), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-192859.

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Denna rapport är gjord på ett examensarbete som var utfört på uppdrag av det svenska företaget Ranotor AB. Syftet var att utveckla en konceptuell lösning för en rotationsventil som skall fungera i en miljö med hög temperatur och högt tryck. Ventilen skall arbeta under höga rotationshastigheter, vilket kräver korta öppettider.Tekniska hjälpmedel såsom SolidWorks, ANSYS och MATLAB användes för att modellera och analysera de konceptuella lösningarna. Slutlösningen valdes från ett flertal olika koncept, varpå detta vidareutvecklades och optimerades. Betydande material och gastätningslösningar identifierades och utvärderades för att hitta den bästa lösningen. Optimering av individuella komponenter och hela anordningen gjordes med avseende på spänning, termisk- och dynamisk analys. De givna specifikationerna uppfylldes och resultaten var tillfredsställande. Resultaten ger en teoretisk bas för vidareutveckling och applicering av en rotationsventil in en miljö med hög temperatur och högt tryck.<br>This Master thesis is a project commissioned by the Swedish company Ranotor AB. The objective of this thesis is to develop a conceptual solution for a rotary valve mechanism that has to work efficiently in a high-temperature and high-pressure environment. The valve is to operate at high rotational speeds which calls for very short opening time.Modern engineering tools namely Solidworks, Ansys and Matlab, were employed for modelling and analysis of the conceptual solution.The best design solution was selected from three developed concepts, and the selected concept was further developed and optimized. Major material candidates and gas-tight sealing solution were identified and evaluated and the optimal material and seal design was chosen. Optimization of the individual components as well as the whole assembly was performed based on stress, thermal and dynamic analysis. The given design specifications and functions were fulfilled and the results were satisfactory. The obtained results provide a theoretical foundation for the development and application of a rotary valve in high-temperature and high-pressure environment.
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Eriksson, Mikael, and Daniel Olovsson. "An Alternative Variable Valve Timing System for Heavy Duty Vehicles." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-60153.

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The ability to control engine valve timing has the potential to alter the engine performance over the entire operating range. The outcome of valve timing technology enables the possibility to increase efficiency, lowering emissions, increase engine torque, etc. One of the simplest ways to obtain a variable valve timing is to use cam phasers. The dynamics of a hydraulic cam phaser has been studied, three concepts with the purpose to control such an element has been developed using simulation driven product development. Focus have been on robustness, simplicity and implementation. A final concept using on/off solenoids to control a torque driven cam phaser has been designed and simulated in GT-SUITE which validated its performance and functionality. A dynamic model was built in Simulink which simulated the behaviour of the cam phaser and provided tools for optimizing the rotor design. By combining the knowledge of mechanical- and control engineering at Scania, the development process of such machine elements was effective. The outcome of this thesis has given a new perspective in understanding these components and their potentials.
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Bekele, Teshale, Rafael Åman, and Heikki Handroos. "The Control of Multiple Actuators using Single IEHEC Pump/Motor." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-199409.

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The awareness and concern of our environment together with legislation have set more and more tightening demands for energy efficiency of non-road mobile machinery(NRMM). Integrated electro- hydraulic energy converter (IEHEC) has been developed in Lappeenranta University of Technology (LUT) /1/. The elimination of resistance flow, and the recuperation of energy makes it very efficient alternative. The difficulties of IEHEC machine to step to the market has been the requirement of one IEHEC machine per one actuator. The idea is to switch IEHEC between two actuators of log crane using fast on/off valves. The control system architecture is introduced. The system has been simulated in co-simulation using Simulink/Mevea. The simulated responses of pumpcontrolled system is compared to the responses of the conventional valve-controlled system.
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ALLMÉR, KATARINA, and SOFIA FEYCHTING. "Off-Peak Deliveries from a Business Model Perspective." Thesis, KTH, Industriell Management, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-191287.

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With an increasing urban population around the world, the need for urban freight distribution is constantly growing. Many cities face problems with traffic congestion, especially during eak hours in the morning and afternoon. At the same time, the roads are often nearly empty during nighttime. In some cities, like Stockholm, heavy haulage is not permitted to enter the city during the night. This means that carriers are forced to perform these deliveries during the day, which leads to inefficient distribution. To investigate the possibilities to use nighttime hours for deliveries, which could lead to a more efficient distribution system and increased sustainability of the city, a pilot project has been initiated by the City of Stockholm to test off-peak deliveries. Other similar trial projects have encountered difficulties with getting businesses to participate, and the incentives to shift to offpeak deliveries have been unclear. Therefore, this thesis aims to investigate what incentives there are for actors within a supply chain to make this shift and the key factors that enable the supply chain to benefit. The thesis is performed as a case study on the pilot project in Stockholm, and uses a business model perspective to analyze how value is created and captured throughout the supply chain. The results show that there is potential for supply chains to increase its total value through offpeak deliveries as a result of increased efficiency, improved delivery reliability and increased utilization of trucks. Pricing models and relative negotiation power between actors have a large effect on how the value is distributed. The main contributors to creating increased value are sufficient delivery volume, compatible processes, and full utilization of trucks. The possibility to use off-peak deliveries for marketing is relatively unexploited and could potentially create more value.<br>Med  en  ökande  befolkning  i  städer  världen  över  ökar  också  behovet  av  varudistribution  istadskärnor. Många städer har problem med trängsel i trafiken, i synnerhet under rusningstid på morgonen och eftermiddagen. Samtidigt är vägarna ofta nästan tomma på natten. I en del städer, som Stockholm, är det förbjudet att köra tung lastbil i innerstaden under natten. Detta betyder att distributörer är tvingade att utföra dessa leveranser under dagtid, vilket leder till ineffektiv distribution.För att undersöka möjligheterna att utnyttja nattens timmar till leveranser, vilket skulle kunna leda till ett mer effektivt distributionssystem och en ökad hållbarhet för staden, har ett pilotprojekt initierats av Stockholms Stad för att testa nattliga leveranser. Andra liknande projekt har stött på problem med att få företag att deltaga, och incitamenten för att flytta leveranser till nattetid har varit otydliga. Därför syftar detta arbete till att undersöka vilka incitament som finns för aktörer inom en försörjningskedja att göra detta byte och vilka huvudfaktorer som möjliggör att kedjan kan dra fördel av det.Arbetet utförs i form av en fallstudie på pilotprojektet i Stockholm, och använder ett affärsmodellsperspektiv för att analysera hur värde skapas och fångas inom kedjan. Resultaten visar att det finns potential för försörjningskedjor att öka sitt totala värde genom nattliga leveranser som ett resultat av ökad effektivitet, förbättrad leveranssäkerhet och ökad nyttjandegrad av lastbilen. Prismodeller och relativ förhandlingsmakt mellan aktörer har en stor påverkan på hur värdet fördelas. De faktorer som bidrar mest till ett ökat värde är tillräcklig leveransvolym, kompatibla processer och hög nyttjandegrad av lastbilar. Möjligheten att använda nattliga leveranser för marknadsföringssyfte är relativt outnyttjat och skulle potentiellt kunna skapa mer värde.
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Steinsland, Vidar. "Modeling and Control of Retarder using On/Off Solenoid Valves." Thesis, KTH, Reglerteknik, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-105880.

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The Retarder is one of the main components in Scania's trucks' braking system and is used to brake down the truck and for maintaining a steady speed on descents. This Master's Thesis aims to investigate if the current system which uses a proportional valve to control the air pressure in the Retarder, can be replaced with two on/o® solenoid valves and a pressure chamber to control the air pressure, which would result in a cheaper and more robust system. By varying the air pressure, the braking torque in the truck can be regulated. A model including electrical drives from a control unit, valves, pressure chamber and a regulating valve is derived. Using the model as reference, a controller is designed and implemented to control the valves, and thereby the pressure. Based on experience from employees at Scania and former research on on/o® control of an Exhaust Gas Recirculation system, a regular PID-controller is used as the base in the control. A pulsing scheme where the valves are activated separately is used to distribute the control signal to the two valves. Di®erent ways of applying the control signal are investigated, whether the valves run digital, i.e. 0 % or 100 %, or continuously by varying the PWM signal. A boosting action using non-linear control, and prediction are investigated in order to improve the control performance in such way that the required time response and robustness is obtained. The controller is eventually tested and veri¯ed on the real system.
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Ulrich, David F. "Winning Off The Field: The Determinants of MLB Franchise Value." Scholarship @ Claremont, 2011. http://scholarship.claremont.edu/cmc_theses/292.

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This paper examines the underlying drivers of MLB franchise value. Using panel data for MLB teams from 2000-2010, I find that a team’s ballpark and metro-area market are significant determinants, yet revenues truly drive value. Further, I find that incremental increases in winning percentage by a particular team has an insignificant effect on total revenues and has no marginal impact on the value of the team, particularly if the team recognizes consistent revenue streams every year. Finally, I show that the modern sabermetric approach to player management negatively impacts firm value, suggesting that although small market teams have been successful using this strategy to increase their on-field performance, its use in isolation is not financially beneficial to the organization in the long run.
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Valle, Rios Laura Elisa [Verfasser]. "Structural trends in off-stoichiometric kesterite type compound Cu2ZnSnSe4 semiconductor / Laura Elisa Valle Rios." Berlin : Freie Universität Berlin, 2017. http://d-nb.info/1130656713/34.

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Books on the topic "On/off valve"

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Mizik, Natalie. Trading off value creation and value appropriation: The financial implications of shifts in strategic emphasis. Marketing Science Institute, 2002.

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Vollmar, Jens. Spin-offs, Diversifikation und Shareholder Value. Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-06559-1.

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Office, National Audit. HM Customs and Excise: Writing off VAT arrears : report. HMSO, 1995.

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Arjani, Neville. Examining the trade-off between settlement delay and intraday liquidity in Canada's LVTS: A simulation approach. Bank of Canada, 2006.

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Arjani, Neville. Examining the trade-off between settlement delay and intraday liquidity in Canada's LVTS: A simulation approach. Bank of Canada, 2006.

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Arjani, Neville. Examining the trade-off between settlement delay and intraday liquidity in Canada's LVTS: A simulation approach. Bank of Canada, 2006.

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Gullison, Ted. Logging off: Mechanisms to stop or prevent industrial logging in forests of high conservation value. Union of Concerned Scientists, 2001.

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Brainard, William C. Fundamental value and market value. National Bureau of Economic Research, 1990.

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Edleson, Michael E. Value Averaging. John Wiley & Sons, Ltd., 2006.

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Paine, Lynn Sharp. Value Shift. McGraw-Hill, 2009.

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Book chapters on the topic "On/off valve"

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Shimooka, So, Shujiro Dohta, Tetsuya Akagi, and Yoshinori Moriwake. "Analysis and Simulation of Small-Sized Quasi-servo Valve Using Tiny On/Off Control Valve." In Lecture Notes in Electrical Engineering. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-17314-6_8.

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Fuhao, Ye, Chen Huiyan, Tao Gang, and Liu Yuwei. "Bi-state Modulation for High Speed On/Off Solenoid Valve." In Lecture Notes in Electrical Engineering. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-25905-0_16.

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Karar, Mohamed Esmail, Matthias John, David Holzhey, Volkmar Falk, Friedrich-Wilhelm Mohr, and Oliver Burgert. "Model-Updated Image-Guided Minimally Invasive Off-Pump Transcatheter Aortic Valve Implantation." In Lecture Notes in Computer Science. Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-23623-5_35.

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Spindler, Jacob, Rico Schulze, Kevin Schleifer, and Hendrik Richter. "EDA-Based Optimization of Blow-Off Valve Positions for Centrifugal Compressor Systems." In Applications of Evolutionary Computation. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72699-7_28.

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Töpfer, Georg, Adrian Troeger, Justus Himstedt, and Stefan Steichele. "Variable valve actuation as an efficient measure for Off-Highway (OHW) drive systems." In Proceedings. Springer Fachmedien Wiesbaden, 2020. http://dx.doi.org/10.1007/978-3-658-30500-0_9.

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Li, Feng P., Martin Rajchl, James A. White, Aashish Goela, and Terry M. Peters. "Towards CT Enhanced Ultrasound Guidance for Off-pump Beating Heart Mitral Valve Repair." In Augmented Reality Environments for Medical Imaging and Computer-Assisted Interventions. Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-40843-4_15.

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Chen, Yong, Shuangquan Liu, Shuqin Xiao, and Yuefei Ren. "Development of Emergent Shut-off Valve at Gas Wellhead in Sulige Gas Field." In Springer Series in Geomechanics and Geoengineering. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7560-5_101.

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Eichenberg, Andreas. "Methodology for the development of variable valve drive systems from concept to series approval with focus on heavy-duty engines." In Heavy-Duty-, On- und Off-Highway-Motoren 2017. Springer Fachmedien Wiesbaden, 2018. http://dx.doi.org/10.1007/978-3-658-21029-8_13.

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Vollmar, Jens. "Propädeutische Überlegungen zum Spin-off-Erfolg." In Spin-offs, Diversifikation und Shareholder Value. Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-06559-1_2.

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Vollmar, Jens. "Spin-off-Erfolg: Beurteilung, Messung und Potenzial." In Spin-offs, Diversifikation und Shareholder Value. Springer Fachmedien Wiesbaden, 2014. http://dx.doi.org/10.1007/978-3-658-06559-1_3.

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Conference papers on the topic "On/off valve"

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Tu, Haink C., Michael B. Rannow, James D. Van de Ven, Meng Wang, Perry Y. Li, and Thomas R. Chase. "High Speed Rotary Pulse Width Modulated On/Off Valve." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42559.

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A key enabling technology to effective on/off valve based control of hydraulic systems is the high speed on/off valve. High speed valves improve system efficiency for a given PWM frequency, offer faster control bandwidth, and produce smaller output pressure ripples. Current valves rely on the linear translation of a spool or poppet to meter flow. The valve spool must reverse direction twice per PWM cycle. This constant acceleration and deceleration of the spool requires a power input proportional to the PWM frequency cubed. As a result, current linear valves are severely limited in their switching frequencies. In this paper, we present a novel fluid driven PWM on/off valve design that is based on a unidirectional rotary spool. The spool is rotated by capturing momentum from the fluid flow through the valve. The on/off functionality of our design is achieved via helical barriers that protrude from the surface of a cylindrical spool. As the spool rotates, the helical barriers selectively channel the flow to the application (on) or to tank (off). The duty ratio is controlled by altering the axial position of the spool. Since the spool no longer accelerates or decelerates during operation, the power input to drive the valve must only compensate for viscous friction, which is proportional to the PWM frequency squared. We predict that our current design, sized for a nominal flow rate of 40l/m, can achieve a PWM frequency of 84Hz. This paper presents our valve concept, design equations, and an analysis of predicted performance. A simulation of our design is also presented.
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Cui, P., R. T. Burton, and P. R. Ukrainetz. "Development of a High Speed On/Off Valve." In International Off-Highway & Powerplant Congress & Exposition. SAE International, 1991. http://dx.doi.org/10.4271/911815.

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Katz, Allan A., and James D. Van de Ven. "Design of a High-Speed On-Off Valve." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11189.

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On-off control of hydraulic circuits enables significant improvements in efficiency compared with throttling valve control. A key enabling technology to on-off control is an efficient high-speed on-off valve. This paper documents the design of an on-off hydraulic valve that minimizes input power requirements and increases operating frequency over existing technology by utilizing a continuously rotating valve design. This is accomplished through use of spinning port discs, which divides the flow into pulses, with the relative phase between these discs determining the pulse duration. A mathematical model for determining system efficiency is developed with a focus on the throttling, leakage, compressibility, and viscous friction power losses of the valve. Parameters affecting these losses were optimized to produce the most efficient design under the chosen disc-style architecture. Using these optimum parameter values, a first generation prototype valve was developed and experimental data collected. The experimental valve matched predicted output pressure and flows well, but suffered from larger than expected torque requirements and leakage. In addition, due to motor limitations, the valve was only able to achieve a 64Hz switching frequency versus the designed 100Hz frequency. Future research will focus on improving the prototype valve and improving the analytical model based on the experimental results.
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McLeod, A. Jonathan, John Moore, Gerard M. Guiraudon, Doug L. Jones, Gordon Campbell, and Terry M. Peters. "Surgical phantom for off-pump mitral valve replacement." In SPIE Medical Imaging, edited by Kenneth H. Wong and David R. Holmes III. SPIE, 2011. http://dx.doi.org/10.1117/12.877724.

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Paloniitty, Miika, and Matti Linjama. "A Miniature On/Off Valve Concept for High Performance Water Hydraulics." In ASME/BATH 2017 Symposium on Fluid Power and Motion Control. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/fpmc2017-4254.

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Digital hydraulic control valve technology has shown its strengths in providing reliable, leak-tight and high performance valve control regardless of the pressure medium used, oil or water. This is enabled by the intelligent use of robust on/off seat valves. However, the availability of these valves for water hydraulics is limited, especially that of compact valves, which are needed for digital valve systems. Thus, with the aim to create a compact digital water hydraulic valve system, this paper presents the development process of a water hydraulic miniature valve. The starting point for the development is a previously developed miniature valve for oil hydraulics. Experimental results with the new prototype show that good performance can be achieved for the miniature valve even with using stainless steel materials. This enables high-performance digital water hydraulic control.
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6

Book, Ruth, and Carroll E. Goering. "Programmable Electrohydraulic Valve." In International Off-Highway & Powerplant Congress & Exposition. SAE International, 1999. http://dx.doi.org/10.4271/1999-01-2852.

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Avsec, Jurij, and Milan Marčič. "Valve Gear Refinement." In International Off-Highway & Powerplant Congress & Exposition. SAE International, 1998. http://dx.doi.org/10.4271/982046.

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8

Rannow, Michael B., and Perry Y. Li. "On/Off Valve Based Position Control of a Hydraulic Cylinder." In ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-42590.

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A method of precisely controlling the position of a hydraulic actuator using an on/off valve is developed. Since valves exhibit little power loss when they are fully open or fully closed, the proposed system is more efficient than throttling valve control and can achieve flow variation without the expense or bulk of a variable displacement pump. Mating a pulse-width-modulated (PWMed) on/off valve with a fixed displacement pump and a smoothing accumulator creates a software enabled variable displacement pump. A drawback of using digital valve control for hydraulic systems is that the relatively low speed of the currently available switching valves results in a significant ripple in the pressure and flow rate. We propose a solution to this problem by using a throttling valve to shield the actuator from the ripple in the output. This creates an effective load sensing system with the throttling valve used only to provide a small known pressure drop between the supply and the load. This approach is significantly more efficient than the conventional technique of using throttling to vary the full flow. This paper presents an averaged model of the system, a nonlinear controller to achieve position control of an actuator and a simulation based study of the effectiveness of the controller.
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Li, Feng P., Martin Rajchl, John Moore, and Terry M. Peters. "Ultrasound based mitral valve annulus tracking for off-pump beating heart mitral valve repair." In SPIE Medical Imaging, edited by Ziv R. Yaniv and David R. Holmes. SPIE, 2014. http://dx.doi.org/10.1117/12.2043562.

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10

Tu, Haink C., Michael B. Rannow, Meng Wang, Perry Y. Li, and Thomas R. Chase. "Modeling and Validation of a High Speed Rotary PWM On/Off Valve." In ASME 2009 Dynamic Systems and Control Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/dscc2009-2763.

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Efficient high-speed on/off valves are a critical technology for enabling digital control of hydraulic systems via pulse-width-modulation (PWM). High-speed valves, when used in virtually variable displacement pumps (VVDP), increase system bandwidth and reduce output pressure ripple by enabling higher PWM frequencies. Our approach to achieving high speed and large flow area with low actuation power is a unidirectional rotary valve designed specifically for PWM. In comparison to conventional valves, the rotary valve reduces valve actuation power from a cubic dependence on PWM frequency to a square dependence by eliminating motion reversals during transition. This paper presents experimental data that validates the rotary valve concept, valve design equations, and dynamic model of a rotary valve based VVDP. Our unoptimized prototype exhibits 65% efficiency at 50% displacement and 15Hz PWM frequency while the validated model projects that an optimized valve is capable of achieving 85% efficiency at 15Hz and 73% at 75Hz.
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Reports on the topic "On/off valve"

1

Volk, J., and H. Rostamian. A solenoid shut off valve specification for flammable gas systems. Office of Scientific and Technical Information (OSTI), 1990. http://dx.doi.org/10.2172/5041950.

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2

Saul, WVenner. Reverse Initiation of the Reynolds RP-87 Detonator Resulting from Off-Normal Functioning of the Ultrafast Closure Valve System. Office of Scientific and Technical Information (OSTI), 2019. http://dx.doi.org/10.2172/1574172.

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3

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

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Lacey, P. I., S. M. Hsu, R. S. Gates, et al. Wear mechanisms of valves and valve seat inserts in a gas-fired reciprocating engine. National Institute of Standards and Technology, 1990. http://dx.doi.org/10.6028/nist.ir.90-4264.

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Clark, R. L. Effects of aging and service wear on main steam isolation valves and valve operators. Office of Scientific and Technical Information (OSTI), 1996. http://dx.doi.org/10.2172/204274.

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Zhao, Xueshan, Kaibo Sun, Siwei Bi, and Zhong Wu. A systematic review and meta-analysis of aortic valve repair for bicuspid versus tricuspid aortic valves. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, 2020. http://dx.doi.org/10.37766/inplasy2020.12.0079.

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7

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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Gotoh, Takashi, Yoichi Takashima, Takuo Mizuno, Masami Wakita, and Keiji Hasegawa. Valve Train Dynamic Analysis and Digital Data Based Manufacturing of the Valve Spring. SAE International, 2005. http://dx.doi.org/10.4271/2005-32-0046.

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9

Prinz, F. B., and J. H. Chern. Automatic monitoring of valve status. Office of Scientific and Technical Information (OSTI), 1989. http://dx.doi.org/10.2172/10197032.

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Prinz, F. B., and J. H. Chern. Automatic monitoring of valve status. Office of Scientific and Technical Information (OSTI), 1988. http://dx.doi.org/10.2172/10197033.

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