Visualization of Flashing Phenomena around a Butterfly Valve

The purpose of this paper is to address the structural integrity of the motor operated butterfly valve assembly by providing the methodology and equations to quantitatively determine the permissible component load in the load path from the operator to the valve. The weak link analysis is to determine the maximum allowable torque on the butterfly valve by equating the stresses caused by the torque and seismic load with the appropriate allowable stress value, and then the unknown torque is solved. Analysis methods are based on classical static force balancing equations and on classical axial, shear, and bending stress equations using the worst possible load combinations including seismic loads resulting from design basis earthquake.

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Compressible Flowfield Characteristics of Butterfly Valves

Journal of Fluids Engineering ◽

10.1115/1.3243659 ◽

1989 ◽

Vol 111 (4) ◽

pp. 400-407 ◽

Cited By ~ 17

Author(s):

M. J. Morris ◽

J. C. Dutton

Keyword(s):

Flow Separation ◽

Pressure Ratio ◽

Disk Surface ◽

Surface Flow ◽

Operating Conditions ◽

Local Geometry ◽

Operating Pressure ◽

Butterfly Valve ◽

Pressure Distributions ◽

Flow Separation And Reattachment

The results of an experimental investigation into the flowfield characteristics of butterfly valves under compressible flow operating conditions are reported. The experimental results include Schlieren and surface flow visualizations and flowfield static pressure distributions. Two valve disk shapes have been studied in a planar, two-dimensional test section: a generic biconvex circular arc profile and the midplane cross-section of a prototype butterfly valve. The valve disk angle and operating pressure ratio have also been varied in these experiments. The results demonstrate that under certain conditions of operation the butterfly valve flowfield can be extremely complex with oblique shock waves, expansion fans, and regions of flow separation and reattachment. In addition, the sensitivity of the valve disk surface pressure distributions to the local geometry near the leading and trailing edges and the relation of the aerodynamic torque to flow separation and reattachment on the disk are shown.

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New butterfly valve design

Metallurgist ◽

10.1007/bf00732335 ◽

1957 ◽

Vol 1 (2) ◽

pp. 113-114

Author(s):

I. B. Goldenberg ◽

E. I. Dikshtein

Keyword(s):

Butterfly Valve ◽

Valve Design

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COMPARATIVE STUDY OF THE FLOW ANALYSIS RESULTS FOR BUTTERFLY VALVE USING DIFFERENT TURBULENCE MODELS

Journal of computational fluids engineering ◽

10.6112/kscfe.2021.26.1.113 ◽

2021 ◽

Vol 26 (1) ◽

pp. 113-120

Author(s):

J.H. Bae ◽

G.H. Lee

Keyword(s):

Comparative Study ◽

Flow Analysis ◽

Turbulence Models ◽

Butterfly Valve

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Effect Analysis of Design Variables on the Disc in a Double-Eccentric Butterfly Valve

The Scientific World JOURNAL ◽

10.1155/2014/305085 ◽

2014 ◽

Vol 2014 ◽

pp. 1-6 ◽

Cited By ~ 2

Author(s):

Sangmo Kang ◽

Da-Eun Kim ◽

Kuk-Kyeom Kim ◽

Jun-Oh Kim

Keyword(s):

Pressure Drop ◽

Maximum Stress ◽

Optimal Combination ◽

Three Dimensions ◽

Butterfly Valve ◽

Effect Analysis ◽

Performance Simulation ◽

Design Variables ◽

Commercial Package ◽

Simulation Results

We have performed a shape optimization of the disc in an industrial double-eccentric butterfly valve using the effect analysis of design variables to enhance the valve performance. For the optimization, we select three performance quantities such as pressure drop, maximum stress, and mass (weight) as the responses and three dimensions regarding the disc shape as the design variables. Subsequently, we compose a layout of orthogonal array (L16) by performing numerical simulations on the flow and structure using a commercial package, ANSYS v13.0, and then make an effect analysis of the design variables on the responses using the design of experiments. Finally, we formulate a multiobjective function consisting of the three responses and then propose an optimal combination of the design variables to maximize the valve performance. Simulation results show that the disc thickness makes the most significant effect on the performance and the optimal design provides better performance than the initial design.

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

Journal of Fluids Engineering ◽

10.1115/1.3240799 ◽

1981 ◽

Vol 103 (3) ◽

pp. 396-404 ◽

Cited By ~ 1

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.

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