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Predicting pressure losses in straight-through diaphragm valves
Author(s)
Mbiya, Baudouin Mulumba
Date Issued
2007
Type
Thesis
Publisher
Cape Peninsula University of Technology
Abstract
The diaphragm valve traces its origins to ancient Roman and Greek times, where it
was used to control water flow and temperature of hot baths (Century-Instruments,
2007). The particularity of this type of valve is the presence of a diaphragm or
membrane which controls the flow. Over the years, the design of this type of valve
has evolved into two major varieties. The first is the "weir" type, more suitable for less
viscous fluids and a second is the "straight-through" type, suitable for suspensions.
This study is focused on the straight-through.
With the widespread use of such valves in the mining and mineral processing
operations and other industrial applications, although there has been improvement in
the selection of the diaphragms and body materials of the valves, as well as
actuation methods, improvements were not accompanied by thorough hydraulic
investigation to determine the method of calculating the additional head loss caused
by the presence of diaphragm valves in pipelines, and in particular for the laminar
flow of non-Newtonian fluids. The limited correlations available, such as Hooper's
(1981), Perry's (1997) and Miller's (1990) are valid only for Newtonian fluids.
Furthermore they are classified as Class 3 (Miller, 1990) which means they are not
corroborated in other independent studies.
BM
was used to control water flow and temperature of hot baths (Century-Instruments,
2007). The particularity of this type of valve is the presence of a diaphragm or
membrane which controls the flow. Over the years, the design of this type of valve
has evolved into two major varieties. The first is the "weir" type, more suitable for less
viscous fluids and a second is the "straight-through" type, suitable for suspensions.
This study is focused on the straight-through.
With the widespread use of such valves in the mining and mineral processing
operations and other industrial applications, although there has been improvement in
the selection of the diaphragms and body materials of the valves, as well as
actuation methods, improvements were not accompanied by thorough hydraulic
investigation to determine the method of calculating the additional head loss caused
by the presence of diaphragm valves in pipelines, and in particular for the laminar
flow of non-Newtonian fluids. The limited correlations available, such as Hooper's
(1981), Perry's (1997) and Miller's (1990) are valid only for Newtonian fluids.
Furthermore they are classified as Class 3 (Miller, 1990) which means they are not
corroborated in other independent studies.
BM
Additional information
Thesis (DTech (Civil Engineering))--Cape Peninsula University of Technology, 2007
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