...Xiaofeng He; Wei Huang; Bihai Zhu; Liang Luo The purpose of this paper is to investigate the air suction characteristics of a water hydraulic piston pump with check valves. The influence of some factors on its air suction performance, including compression ratio, initial spring forces, valve gaps...

... to the experimental evaluation of the fuel leakages in pressure control valve (PCV) integrated pumps. Finally, the mechanical-hydraulic efficiency of the pump has experimentally been assessed as a function of head and speed in order to obtain a reliable evaluation of the pump shaft power and torque at different...

...Gee Soo Lee; Hyung Jin Sung; Hyun Chul Kim; Hyun Woo Lee Three-dimensional numerical simulations were carried out to investigate the flow dynamic behavior and pressure characteristics of a variable force solenoid (VFS) valve used in automatic transmissions. To visualize the dynamic movement...

... flowmeters. Leaks were simulated by opening solenoid valves placed at known positions and previously calibrated to produce known average leak flow rates. Results have clearly shown the limitations and advantages of each method. It is also quite clear that acoustics and mass balance technologies are, in fact...

...Mark Potter; Marko Bacic; Phil Ligrani; Matthew Plackett Practical observations of the nonreturn valve wear in aero-engine cabin-bleed systems suggest that such valves are subject to unstable behavior. A theoretical model for the prediction of nonreturn valve instabilities in air systems...

...Stefano Sibilla; Mario Gallati The ability to obtain correct estimates of the hydraulic characteristics of a nozzle check valve by finite-volume numerical simulation is discussed. The evaluation of the numerical results is performed by comparison of the computed pressure drops inside the valve...

...Raúl Sánchez; Luis Juana; Francisco V. Laguna; Leonor Rodríguez-Sinobas Cavitation effects in valves and other sudden transitions in water distribution systems are studied as their better understanding and quantification is needed for design and analysis purposes and for predicting and controlling...

...Guillermo Palau-Salvador; Pablo González-Altozano; Jaime Arviza-Valverde The ability to understand and manage the performance of hydraulic control valves is important in many automatic and manual industrial processes. The use of computational fluid dynamics (CFD) aids in the design of such valves...

...Kenji Kawashima; Chongho Youn; Toshiharu Kagawa Pneumatic servo valves play a significant role in power transmission and system control using a pressurized gas. When pressurized air passes through servo valves, noise and pressure fluctuations are often experienced at the downstream side...

...Ryo Morita; Fumio Inada; Michitsugu Mori; Kenichi Tezuka; Yoshinobu Tsujimoto Under certain opening conditions (partial opening) of a steam control valve, the piping system in a power plant occasionally experiences large vibrations. To understand the valve instability that is responsible...

...Mark A. Chaiko A finite-volume approach, based on the MUSCL-Hancock method, is presented and applied to liquid-column separation transients in pipelines. In the mathematical model, sudden closure of a valve on the downstream end of a pipeline initiates the hydraulic transient, while a head tank...

... flow pipe flow valves drag turbulence supersonic flow vortices computational fluid dynamics numerical stability butterfly valve compressible flow aerodynamic torque bearing force CFD The objective of this study is to investigate the use of computational fluid dynamics (CFD...

... but unorthodox ways of calculating inertance using a computational fluid dynamics and a finite element solid-modeling package are also demonstrated. Results are presented for a simple cylindrical orifice, a simple spool valve, and a conical poppet valve. The effect of the inertance on the response of a poppet...

...Vineet Ahuja; Ashvin Hosangadi; Jeremy Shipman; Russell Daines; Jody Woods The safe and reliable operation of high-pressure test stands for rocket engine and component testing places an increased emphasis on the performance of control valves and flow metering devices. In this paper, we will present...

...Ju Yeop Park; Myung Kyoon Chung 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...

...Adrian R. Gamboa; Christopher J. Morris; Fred K. Forster The fixed-geometry valve micropump is a seemingly simple device in which the interaction between mechanical, electrical, and fluidic components produces a maximum output near resonance. This type of pump offers advantages such as scalability...

...Ming-Jyh Chern, Assistant professor; Chih-Cheng Wang, Graduate student The control of volume flow rate in a ball valve is very important when a ball valve is utilized in a piping system. It is difficult to linearly control the flow rate in a ball valve without external devices. V-ports are employed...

...Kenji Kawashima; Yukio Ishii; Tatsuya Funaki; Toshiharu Kagawa In this paper, two new methods for obtaining the sonic conductance and the critical pressure ratio of pneumatic valves are proposed. Both methods use a chamber that can approximate isothermal conditions. This was achieved by filling...

...Guohua Li, Graduate Student; Jim C. P. Liou, Professor The hydraulic torque on the disk of a swing check valve strongly influences the dynamic valve-fluid interaction. This torque is difficult to quantify. In this study, the hydraulic torque is separated into a torque due to flow around...

... of spaceflight, earthquake simulation, and geotechnique. Based on theories of fluid dynamics and performance of an electrohydraulic servovalve, the fluid flow and structure of a two-stage electrohydraulic servovalve are analyzed when the valve is affected by centrifugal forces in operation. From calculation...