scholarly journals An air-operated pinch valve for chemostat outlet flow control

1972 ◽  
Vol 14 (6) ◽  
pp. 1045-1046 ◽  
Author(s):  
D. E. Brown ◽  
M. B. Inkson
Keyword(s):  
Flow Control ◽  
Pinch Valve ◽  
Outlet Flow

Performance of a flow control valve with pilot switching valve

2017 ◽  
Vol 232 (2) ◽  
pp. 178-194 ◽  
Author(s):  
Xiaoyan Xiong ◽  
Jiahai Huang
Keyword(s):  
Flow Control ◽  
Pulse Width ◽  
Pulse Width Modulation ◽  
Control Valve ◽  
Duty Ratio ◽  
Main Stage ◽  
Flow Control Valve ◽  
Average Pressure ◽  
Switching Valve ◽  
Outlet Flow

In digital fluid power, fast switching valve is a potential digital hydraulic component because of less throttling loss, reliability, low price, and so on. But its outlet flow is usually small and discontinuous. In this article, a two-stage proportional flow control valve is presented, in which the main stage is a flow amplifying valve, and the pilot stage consists of several switching valves with pulse width modulation control strategy. Peak and hold technique is adopted to improve the dynamic performance of the pilot stage. Benefits of the proposed configuration are continuous outlet flow and large flow capacity. The valve performance is investigated by theoretical analysis, simulation, and test. It is shown that both poppet displacement and outlet flow fluctuate around a stable value because of the discontinuous pilot flow, but the average outlet flow as well as poppet displacement of the main stage can be approximately proportionally regulated by changing pulse width modulation duty ratio. Average outlet flow of the main stage is an amplification of that of pilot stage. Increasing the average pressure drop not only increases outlet flow but also increases the severity of flow pulsations because pressure fluctuation becomes more serious as the average pressure difference increases. In theory, higher carrier frequency leads to smoother outflow; however, tested outflow profile of the proposed valve at 50 Hz is not significantly smoother than that at 30 Hz. This phenomenon may be due to the asynchrony of the four switching valves and the pressure fluctuations during the testing process.

The Matching of Flow Control and Structure Parameters for the Bitumen Foaming Technology

2012 ◽  
Vol 535-537 ◽  
pp. 2002-2006
Author(s):  
Hai Ying Cheng ◽  
Ting Yuan Yan ◽  
Peng Fei Wang ◽  
Zhi Qiang Li ◽  
Juan Du
Keyword(s):  
Flow Control ◽  
Cfd Simulation ◽  
Simulation Analysis ◽  
Contact Heat ◽  
Contact Heat Transfer ◽  
Foaming Behavior ◽  
Outlet Flow ◽  
Flow Theories ◽  
Foamed Bitumen ◽  
Foaming Technology

A new driving device is developed for precise flow control of bitumen foaming. Based on the theoretical studies like fluid dynamics, contact heat transfer, phase change, multiphase flow and turbulent flow theories, a reasonable control model for the bitumen foaming behavior is built. And the CFD simulation analysis of the model with the testing parameters is taken. The results show that the foamed bitumen outlet flow follows the quadratic curve control law with the new driving device.

FLOW CONTROL ACTIVE AND REACTIVE POWER IN ELECTRIC NETWORKS

2016 ◽  
Vol 2016 (5) ◽  
pp. 61-63
Author(s):  
F.P. Govorov ◽  
◽  
V.F. Govorov ◽  
Keyword(s):  
Flow Control ◽  
Reactive Power ◽  
Electric Networks ◽  
Active And Reactive Power

Power-Flow Control Method for Wireless In-Wheel Motor with Supercapacitor

2018 ◽  
Vol 138 (3) ◽  
pp. 219-226
Author(s):  
Takuma Takeuchi ◽  
Takehiro Imura ◽  
Daisuke Gunji ◽  
Hiroshi Fujimoto ◽  
Yoichi Hori
Keyword(s):  
Flow Control ◽  
Power Flow ◽  
Control Method ◽  
Power Flow Control

Review: Flow Control on a Squareback Model

2017 ◽  
Vol 10 (4) ◽  
pp. 230 ◽  
Author(s):  
James Julian ◽  
Riza Farrash Karim ◽  
Budiarso Budiarso ◽  
Harinaldi Harinaldi
Keyword(s):  
Flow Control
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