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Introduction
What is an ARV Its main function
What is Cavitation
Steps & Effects of Cavitation
Minimum Flow Methods
Principle of Operation ARV Features
Application
Installation
Advantages
Material
Business Benefits
Manufacturers
Blackhall Series
Video Animation
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What is an Automatic Recirculation Valve?
Main function
To prevent pump instability, overheating and to prevent Cavitation
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Liquid Vapour Liquid
What is Cavitation?
Cavitation is defined as the process
of formation and disappearance of the
vapour phase of a liquid when it issubjected to reduced and
subsequently increased pressures.
What Does This Mean:
It is the phase transition between liquid
And vapour conditions.
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Steps and Effect
Loose particles created
Knocking sounds
Vibration
Erratic power consumption
Fluctuation or reduction in
pump performance
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Steps in Cavitation
Formation of bubbles inside the liquid
Growth of bubbles
Collapse of bubbles
Cavitat ion
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Minimum Flow Protection Methods
What is it ?
Minimum continuous flow is thelowest flow rate at which a
centrifugal pump may be operated
on a continuous basis without
exceeding the design constraints of
the manufacturer or the equipment
specifier.
Why is it important?
Minimum flow protection isvital upon pump start up and low
demand conditions and for
continuous running of pump.
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Continuous Recirculation System
This is achieved by using a fixedorifice as the pump by-pass.
Recirculation is operating
continuously without any regard
for flow through the pump.
It does protect the pump from
low flow but it is wasteful of energy
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Instrument Controlled System
Relies on other valve accessories
to function well in order for it to
be efficient. Its expensive and has
too many components.
Flow meter Valve solenoid
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Automatic Recirculation System
The valve is flow operated and does
not require any external power
source to operate.
On/Off recirculationSEMI-Modulating recirculation
Fully Modulating recirculation
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Principle Of Operation
3 Phase Sequence
Valve Fully Open - By - Pass Shut
By - Pass Tending to Open - Valve Tending to Close
Valve Shut - By - Pass Fully Open
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.
Stopper
Pressure Reduction Nozzles
Bypass Housing
Non Return Valve in by-passFlow Sensing by nature
Of valve stopper
Geometry and stopper,
Spring assembly.
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Application Centrifugal Pumps
Boiler feed or Cooling water plants
Power stations
Paper and Pulp
Marine and off shore
Refining and Chemical industries.
Pump Discharge Line
Adaptable to horizontal and vertical piping.
Adaptable by design to ensure maximum
Fluid flow velocity.
Flanged Ends.
Typical Installation
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Advantages of A.R.V
No external power source or equipment is required
Energy conservation
Compact, self-contained, tamper and shock proof
Low main flow head loss
Easy installation
Unique design to suite different applications
Combines both check and bypass features
Minimum flow protection continuous
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Material
Carbon Steel
Stainless Steel (Various grades)
Nickel based alloys
Titanium
Exotic alloys
B i B fit M f t
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Business Benefits
Saves Power Costs
Protects the business investment
Eliminates Cavitations
Saves Installation and Maintance
costs
Reduces Downtimes
Manufactures
Blackhall Engineering
Schroedahl-Arapp, Germany
Schroeder Valves, Germany
HBE Engineering, USA
Yarway (Tyco) USA, Europe
S i 6500
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Series 6500
S i 6600
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Series 6600
S i 6700
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Series 6700