scholarly journals Comparative analysis of regulating characteristics between air-ring flow regulating valve and center butterfly valve

PLoS ONE ◽  
2021 ◽  
Vol 16 (5) ◽  
pp. e0251943
Author(s):  
Shixian Wu ◽  
Heqing Liu ◽  
Yongping Chen
Keyword(s):  
Flow Resistance ◽  
Flow Characteristics ◽  
Maximum Velocity ◽  
Experimental System ◽  
Resistance Coefficient ◽  
Flow Coefficient ◽  
Pipeline System ◽  
Butterfly Valve ◽  
Abrasive Erosion ◽  
Valve Opening

In this study, a novel air-ring flow regulating valve was proposed to reduce the flow resistance caused by valve structural pressure drop in fluid transportation pipeline system. The regulating characteristics at different valve openings were analyzed by numerical method and the results were compared with the center butterfly valve which is most widely applied in fluid transportation pipeline system. Besides, an experimental system was designed to validate the numerical model in the present study. The results indicated that the simulation results agree well with experimental data. The resistance coefficient of the air-ring flow regulating valve is smaller than that of the center butterfly valve when the valve opening is greater than 67%, and the resistance coefficient is reduced by up to 100% as the valve is fully opened. Both valves maintain approximately equal percentage flow characteristics, the deviation in relative flow coefficient is small. In addition, the wall shear stress of the air-ring flow regulating valve is much smaller than that of the center butterfly valve at the same valve opening, and the maximum velocity in the pipeline system is always smaller than that of the center butterfly valve, which significantly reduces valve surface abrasive erosion and thus prolongs its service life.

Numerical Study of Large Diameter Butterfly Valve on Flow Characteristics

2011 ◽  
Vol 236-238 ◽  
pp. 1653-1657 ◽  
Author(s):  
Xiao Dong Wang ◽  
Jing Liang Dong ◽  
Tian Wang
Keyword(s):  
Pressure Drop ◽  
Flow Resistance ◽  
Numerical Study ◽  
Large Diameter ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Numerical Approach ◽  
Resistance Coefficient ◽  
Butterfly Valve ◽  
Dimensional Simulation

A numerical approach was used to investigate the flow characteristics around a butterfly valve with the diameter of 2108 mm by the commercial computational fluid dynamics (CFD) code FLUENT6.3. The simulation was carried out to predict flow field structure, flow resistance coefficient, hydrodynamics torque and so on, when the large diameter butterfly valve operated at various opening degrees. The three-dimensional simulation results shown that there are vortexes presented near valve back region as the opening degree smaller than 40 degree; the flow resistance coefficient reduces rapidly with the increasing of opening degree and the resistance coefficient is quite small as the angle larger than 50 degree; the hydrodynamic torque reduces with the increasing of opening degree and the hydrodynamic torque is smaller than 20% of maximum torque; the torque ratio and the pressure drop ratio are reduce with the increasing of opening degree, the pressure drop ratio reduces rapidly as the opening degree is smaller than 50 degree.

Torque Characteristics of a 122-Centimeter Butterfly Valve With a Hydro/Pneumatic Actuator

1981 ◽  
Vol 103 (3) ◽  
pp. 396-404 ◽  
Author(s):  
F. N. Lin ◽  
W. I. Moore ◽  
F. E. Lundy
Keyword(s):  
Hydraulic Resistance ◽  
Flow Resistance ◽  
Field Testing ◽  
Hydraulic Cylinder ◽  
The Other ◽  
Pneumatic Actuator ◽  
Butterfly Valve ◽  
Hydraulic Flow ◽  
Resistance Torque ◽  
Valve Opening

Actuating torque data from field testing of a 122-centimeter (48 in.) butterfly valve with a hydro/pneumatic actuator is presented. The hydraulic cylinder functions as either a forward or a reverse brake. Its resistance torque increases when the valve speeds up and decreases when the valve slows down. A reduction of flow resistance in the hydraulic flow path from one end of the hydraulic cylinder to the other will effectively reduce the hydraulic resistance torque and hence increase the actuating torque. The sum of hydrodynamic and friction torques (combined resistance torque) of a butterfly valve is a function of valve opening time. An increase in the pneumatic actuating pressure will result in a decrease in both the combined resistance torque and the actuator opening torque; however, it does shorten the valve opening time. As the pneumatic pressure increases, the valve opening time for a given configuration approaches an asymptotical value.

Numerical Simulation and Experimental Research of a New Butterfly Valve

2012 ◽  
Vol 212-213 ◽  
pp. 1255-1260 ◽  
Author(s):  
Yang Wang ◽  
Ying Zhu ◽  
Xin Rong Shen ◽  
Jian Feng Ma
Keyword(s):  
Numerical Simulation ◽  
Numerical Simulations ◽  
Linear Relationship ◽  
Experimental Research ◽  
Three Dimensional ◽  
Flow Coefficient ◽  
Butterfly Valve ◽  
Valve Opening ◽  
Research And Design ◽  
Relative Flow

The paper proposes an idea of projection weighted area in designing a new control butterfly valve. A lot of three-dimensional numerical simulations are carried out on the new valve, and the numerical simulations give a good linear relationship between relative flow coefficient and relative valve opening. An experiment setup was established to verify the results of numerical simulations, and the results show that the CFD technology to research and design the new valve plate is entirely feasible.

scholarly journals Flow Characteristics and Stress Analysis of a Parallel Gate Valve

Processes ◽  
2019 ◽  
Vol 7 (11) ◽  
pp. 803 ◽  
Author(s):  
Hui Wu ◽  
Jun-ye Li ◽  
Zhi-xin Gao
Keyword(s):  
Reynolds Number ◽  
Gate Valve ◽  
High Stress ◽  
Flow Characteristics ◽  
Groove Depth ◽  
Loss Coefficient ◽  
Flow Coefficient ◽  
Piping System ◽  
Valve Opening ◽  
Contact Position

Gate valves have been widely used in the piping system and have attracted a lot of attention from researchers. In this paper, a wedge-type double disk parallel gate valve is chosen to be analyzed. The Reynolds number varying from 200 to 500,000, and the valve opening degree varying from 20% to 100%, and the groove depth varying from 2.3 mm to 9 mm are chosen to investigate their effects on the flow and loss coefficients of the gate valve. The results show that the loss coefficient decreases and the flow coefficient increases with the increase of the Reynolds number and the valve opening degree, while with the increase of the groove depth, the loss coefficient barely changes, but the flow coefficient increases if the Reynolds number is larger than 10,000. In addition, the effects of the gaps between the disk and the limit stop on the stress distribution of the bolt are also investigated, and the results show that if the gaps are negative, high stress will act on the bolt at the contact position between the bolt and the limit stop.

scholarly journals Experimental Study on Pressure Distribution and Flow Coefficient of Globe Valve

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 875 ◽  
Author(s):  
Quang Khai Nguyen ◽  
Kwang Hyo Jung ◽  
Gang Nam Lee ◽  
Sung Bu Suh ◽  
Peter To
Keyword(s):  
Reynolds Number ◽  
Pressure Distribution ◽  
Full Range ◽  
Flow Characteristics ◽  
National Standards ◽  
Flow Coefficient ◽  
Test Loop ◽  
Close Range ◽  
Valve Opening ◽  
Globe Valve

In this study, the pressure distribution and flow coefficient of a globe valve are investigated with a series of experiments conducted in a flow test loop. The experiments are performed on a three-inch model test valve from an eight-inch ANSI (American National Standards Institute) B16.11—Class 2500# prototype globe valve with various pump speeds and full range of valve openings. Both inherent and installed flow characteristics are measured, and the results show that the flow coefficient depends not only on the valve geometry and valve opening but also on the Reynolds number. When the Reynolds number exceeds a certain value, the flow coefficients are stable. In addition, the pressures at different positions in the upstream and the downstream of the valve are measured and compared with recommendation per ANSI/ISA-75.01 standard. The results show that, in single-phase flow, the discrepancies in pressure between different measurement locations within close range of 10 nominal diameter from the valve are inconsiderable.

The Parametric Modeling of Local Resistance and Pressure Drop in a Rotary Ball Valve

2017 ◽  
Vol 140 (3) ◽  
Author(s):  
Dan Wang ◽  
Changqing Bai
Keyword(s):  
Pressure Drop ◽  
Flow Resistance ◽  
Analytical Formula ◽  
Resistance Coefficient ◽  
Parametric Modeling ◽  
Equivalent Model ◽  
Local Resistance ◽  
Operating Process ◽  
Valve Opening ◽  
Good Agreement

In this paper, a theoretical study of ball valves is carried out for investigating the local resistance and pressure drop of ball valves in operating process. An equivalent model of ball valves is proposed based on the inherent mechanism of the resistance loss, which can be divided into three equivalent throttling components: a thick orifice, two variable-opening eccentric orifice plates, and a Z type elbow. Through analysis of the flow resistance of the three components, a general parametric modeling of ball valves is presented for the flow resistance analysis, and then an analytical formula of pressure drop is demonstrated. The results obtained from the presented model are compared with the prior test data to validate this model, and good agreement is observed. Indicate that the presented model has high accuracy in predicting the resistance and pressure loss in various openings. The results show that the influences of thin orifice plates play an important role in the total flow resistance coefficient and pressure drop, especially in the small opening. The effects of thick orifice plates and the Z type elbow gradually increased as the valve opening rises and becomes significant when the opening is more than 70%.

A Study on the Flow Characteristics in a Plug Valve With Various Port Shapes

2002 ◽  
Author(s):  
T.-A. Kim ◽  
B.-J. Ahn ◽  
Youn J. Kim
Keyword(s):  
Rate Control ◽  
Velocity Vector ◽  
Static Pressure ◽  
Flow Characteristics ◽  
Resistance Coefficient ◽  
Operating Conditions ◽  
Flow Coefficient ◽  
Improve Performance ◽  
Flow Rate Control ◽  
Plug Valve

Analyses on the characteristics of flow fields in the plug valve are required to improve performance and safety at severe operating conditions such as high-pressure and high-temperature. In this study, numerical and experimental analyses are carried out with various opening rates of the valve and the shapes of the plug port: circular, triangle, and modified triangle shapes. Especially, the distributions of the static pressure, velocity vector and streamlines are investigated to calculate the flow coefficient (Cv) and the resistance coefficient (K) in each opening rate and shape. For the case of full open, the static pressure passed through the valve port has almost been recovered. However, in case of other opening rates, pressure has not permanently recovered due to pressure drop leading to loss. This phenomenon in each shape of the valve shows the different behaviors. Result of calculation show that the modified triangle shape is good on flow characteristics and the triangle one is good for the flow rate control.

scholarly journals Numerical Analysis to the Effect of Guiding Plate on Flow Characteristics in a Ball Valve

Processes ◽  
2020 ◽  
Vol 8 (1) ◽  
pp. 69 ◽  
Author(s):  
Yanping Wang ◽  
Chaoning Zhu ◽  
Guang Zhang ◽  
Dejing Wang ◽  
Minghe Jiang ◽  
...  
Keyword(s):  
High Speed ◽  
Flow Characteristics ◽  
Resistance Coefficient ◽  
Ball Valve ◽  
Flow Coefficient ◽  
Internal Erosion ◽  
Jet Flows ◽  
Gap Flow ◽  
The Stability ◽  
Downstream Flow

When internal flows go through a valve with a small opening degree, high-speed jet flows are induced, which causes the erosion of the valve core and affects the stability of the flow field. Setting guiding plates in the valve behind the valve core has the function of reducing the adverse effect of high-speed jet flows. In this work, numerical simulations were carried out to investigate the effect of the guiding plate on flow and resistance coefficient, velocity and pressure distributions and flow stability downstream of the valve. The number of guiding plates was changed from 0 to 3 and the opening degree was varied from 0 to 100% at intervals of 10%. A guiding plate with holes in it plays the role of bypassing and guiding flow. Under the action of the guiding plate, the flow coefficient obviously decreases, the gap flow between the valve core and the valve wall in the top of the valve are modified, and the gap flow even disappeared in the valve with 3 guiding plates. It was found that setting the guiding plate can improve the performance of the ball valve, reducing the internal erosion and increasing the stability of valve downstream flow efficiently.

scholarly journals Numerical Study of the Microflow Characteristics in a V-ball Valve

Micromachines ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 155
Author(s):  
Zhi-xin Gao ◽  
Yang Yue ◽  
Jia-ming Yang ◽  
Jun-ye Li ◽  
Hui Wu ◽  
...  
Keyword(s):  
Numerical Study ◽  
Flow Characteristics ◽  
Ball Valve ◽  
Loss Coefficient ◽  
Flow Coefficient ◽  
Process Industries ◽  
Opposite Trend ◽  
Small Flow ◽  
Valve Opening ◽  
Flow Cross

V-ball valves are widely applied in many process industries to regulate fluid flow, and they have advantages of good approximately equal percentage flow characteristics and easy maintenance. However, in some applications, the V-ball valve needs to have good performance under both large and extremely small flow coefficients. In this paper, the improvement of the original V-ball valve is made and the flow characteristics between the original and the improved V-ball valve are compared. Two types of small gaps are added to the original V-ball, namely the gap with an approximately rectangular port and the gap with an approximately triangular port. The effects of the structure and the dimension of the gap on flow characteristics are investigated. Results show that within the gap, the flow coefficient increases but the loss coefficient decreases as the valve opening increases, and the flow coefficient has an approximately linear relationship with the flow cross-area of the added gap. Results also show that under the same flow cross-area, the flow coefficient has a higher value if the distance between the gap and the ball center is greater or if the gap is an approximately rectangular port, while the loss coefficient has an opposite trend.

A Test System of Flow Characteristic Based upon PLC for Control Valve

2010 ◽  
Vol 43 ◽  
pp. 14-16
Author(s):  
Geng Fang Wang
Keyword(s):  
Flow Curve ◽  
Flow Characteristic ◽  
Flow Characteristics ◽  
Control Valve ◽  
Design Feature ◽  
Automatic Measurement ◽  
Resistance Coefficient ◽  
Test System ◽  
Flow Coefficient ◽  
Easy Operation

The flow characteristics of control valve are very important to product quality. For measuring the flow coefficient and flow curve accurately and all-rounding, we have designed a test system,which worked with PLC, it can measure the flow characteristics and resistance coefficient of control valve. The main purpose of this study was to bring out the work elements, design feature, and test software.The study we have performed showed that this test system is reasonable, easy to support entire automatic measurement with high precision and easy operation.

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