scholarly journals Lessons Learned from the Space Shuttle Engine Hydrogen Flow Control Valve Poppet Breakage

2011 ◽  
Author(s):  
Hugo Martinez ◽  
John Albright ◽  
Stephen D'Amico ◽  
John Brewer ◽  
John Melcher
Keyword(s):  
Flow Control ◽  
Space Shuttle ◽  
Control Valve ◽  
Lessons Learned ◽  
Flow Control Valve ◽  
Hydrogen Flow

A Multi-modes Flow Control Valve for Simplifying the Driving System of Pneumatic Soft Robots

2020 ◽  
pp. 1-1
Author(s):  
Yang Yang ◽  
Yongjian Zhao ◽  
Songyi Zhong ◽  
Yan Peng ◽  
Yi Yang ◽  
...  
Keyword(s):  
Flow Control ◽  
Control Valve ◽  
Flow Control Valve ◽  
Soft Robots ◽  
Driving System

Pattern Recognition Approach to Fault Diagnosis in the DAMADICS Benchmark Flow Control Valve

2003 ◽  
Vol 36 (5) ◽  
pp. 861-866 ◽  
Author(s):  
A. Marciniak ◽  
C.D. Bocăială ◽  
R. Louro ◽  
J. Sa da Costa ◽  
J. Korbicz
Keyword(s):  
Pattern Recognition ◽  
Fault Diagnosis ◽  
Flow Control ◽  
Control Valve ◽  
Flow Control Valve ◽  
Pattern Recognition Approach

Design and evaluation of orifice arrangement for particle-excitation flow control valve

2011 ◽  
Vol 171 (2) ◽  
pp. 283-291 ◽  
Author(s):  
Daisuke Hirooka ◽  
Koichi Suzumori ◽  
Takefumi Kanda
Keyword(s):  
Flow Control ◽  
Control Valve ◽  
Flow Control Valve

Design and Analysis of a Flow-Control Valve With Controllable Pressure Compensation Capability for Mobile Machinery

2021 ◽  
Author(s):  
Bo Wang ◽  
Yunwei Li ◽  
Long Quan ◽  
Lianpeng Xia
Keyword(s):  
Pressure Drop ◽  
Flow Control ◽  
Pressure Difference ◽  
Control Valve ◽  
Flow Control Valve ◽  
Continuous Control ◽  
Small Flow ◽  
Pressure Compensation ◽  
Force Compensation ◽  
Control Accuracy

Abstract There are the problems in the traditional pressure-compensation flow-control valve, such as low flow control accuracy, small flow control difficulty, and limited flow range. For this, a method of continuous control pressure drop Δprated (i.e. the pressure drop across the main throttling orifice) to control flow-control valve flow is proposed. The precise control of small flow is realized by reducing the pressure drop Δprated and the flow range is amplified by increasing pressure drop Δprated. At the same time, it can also compensate the flow force to improve the flow control accuracy by regulating the pressure drop Δprated. In the research, the flow-control valve with controllable pressure compensation capability (FVCP) was designed firstly and theoretically analyzed. Then the sub-model model of PPRV and the joint simulation model of the FVCP were established and verified through experiments. Finally, the continuous control characteristics of pressure drop Δprated, the flow characteristics, and flow force compensation were studied. The research results demonstrate that, compared with the traditional flow-control valve, the designed FVCP can adjust the compensation pressure difference in the range of 0∼3.4 MPa in real-time. And the flow rate can be altered within the range of 44%∼136% of the rated flow. By adjusting the compensation pressure difference to compensate the flow force, the flow control accuracy of the multi-way valve is improved, and the flow force compensation effect is obvious.

scholarly journals Investigation of thermal mechanical coupling numerical simulation and theoretical study of k-shaped combined metal seal of downhole flow control valve

2021 ◽  
Vol 25 (4 Part B) ◽  
pp. 3053-3061
Author(s):  
Linfeng Zhang ◽  
Dongsheng He ◽  
Ya Tan ◽  
Liangbin Xu
Keyword(s):  
Flow Control ◽  
Contact Stress ◽  
Base Alloy ◽  
Thermal Structure ◽  
Control Valve ◽  
Flow Control Valve ◽  
Beam Model ◽  
Mechanical Coupling ◽  
Metal Seal ◽  
Seal Assembly

The K-shaped seal assembly is composed of K-shaped metal seal, high temperature nickel base alloy (GH4169). Its sealing performance directly affects the reliability and stability of flow control system. The 2-D axisymmetric K-shaped metal seal is abstracted as the combination of interference fit model and cantilever beam model. Considering the influence of temperature on the seal, based on the 2-D constitutive relation of elastic medium and heat conduction theory, the theoretical model between contact stress and self variation of K-shaped metal seal ring is deduced by using inverse method. Using ABAQUS thermal structure coupling analysis method, the thermal mechanical coupling finite element model of K-shaped seal assembly is established. The theoretical analytical solution proposed in this paper can be used to calculate the approximate solution of contact stress of radial metal seal under current oilfield conditions, and provides theoretical support for the numerical calculation of thermal stress of radial metal seal.

scholarly journals Design and Fabrication of Two Step Speed Control of a Cylinder Circuit using Pneumatics

2019 ◽  
Vol 8 (6S2) ◽  
pp. 512-516
Keyword(s):  
Flow Control ◽  
High Speed ◽  
Air Flow ◽  
Control Valve ◽  
Speed Control ◽  
Flow Control Valve ◽  
Push Button ◽  
Low Speed ◽  
Flow Through

The main aim of our project is to design and fabrication of pneumatic two step speed control of a cylinder. Initially the flow from the FRL retracts the cylinder when the push button is in its spring offset position. When it is pushed the flow pilots actuate. The air passes through the flow control and shuttle valve. Then the cylinder extends with high speed as the valve allows more air to enter the cylinder. When the piston reaches the position it operates the cam push button and pilot air flow through this and actuate 5/2 pilot operated valve and reaches flow control valve which permits less air. Then the flow through enters the shuttle valve to cylinder and allows the cylinder to extend at relatively low speed. At the end of extension stroke deactivating push button retracts the cylinder. Thus the speed of cylinder is controlled and project can be achieved

scholarly journals Calculation of hydraulic resistance in the separator of the direct-flow control valve with a rotary lock

2020 ◽  
Vol 220 ◽  
pp. 01073
Author(s):  
Anna Kapranova ◽  
Anton Lebedev ◽  
Alexander Melzer
Keyword(s):  
Flow Control ◽  
Hydraulic Resistance ◽  
Control Valve ◽  
Resistance Coefficient ◽  
Hydrodynamic Cavitation ◽  
Qualitative Assessment ◽  
Design Parameters ◽  
Flow Control Valve ◽  
Direct Flow ◽  
Method Of Calculation

The purpose of this work is to analyze the coefficient of hydraulic resistance in the separator of a direct-flow control valve with a rotary lock according to the approximation of the superposition of pressure losses in elementary local resistances. In contrast to the known methods of constructing simulation models, the proposed analytical method of calculation is based on a qualitative assessment of the specified coefficient in the implementation of throttling of fluid flows in the “separator-rotary lock” unit, depending on the design and operating parameters of the process. It was found that, within the selected range of variation of the separator parameters, an increase in the valve opening degree from 20% to 50% leads to a decrease in the hydraulic resistance coefficient by 19.6 times, and an increase in this degree from 20% to 100% is associated with a 42.4-fold decrease in the studied characteristic. This circumstance justifies the effectiveness of the proposed method for throttling the flows of the working medium. The results obtained are used to study the influence of the main design parameters of the “separator-butterfly valve” unit on the flow capacity of the control valve and are relevant for stochastic modeling of the hydrodynamic cavitation process.

Sign in / Sign up

Export Citation Format

Share Document