Types of Automatic Control Valves
Transcript of Types of Automatic Control Valves
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Types of Automatic Control Valves
• Hydraulic
• Electronic
• Electronic with Hydraulic Back‐Up
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Line Pressure to OpenLine Pressure to Open
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Line Pressure to Close
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Flow DirectionFlow Direction
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Control Valve Applications• Pressure Reducing• Pressure Relief/Sustaining• Pump Control• Rate‐of‐Flow Control• Level Control• Cavitation
Control
• Surge Anticipation• Electronic Control• Metering• Valve‐Based Power Generation
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Pressure Reducing Valves• Reduces a higher inlet pressure to a constant
downstream pressure regardless of demand and supply pressure fluctuations
• Enables delivery of water at safe pressures and adequate levels for customer needs
• Installations:– Main line feeds– Distribution zones– Fire systems– Irrigation systems
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Pressure Relief/Pressure Sustaining Valves
• Relieves excess pressure while maintaining a minimum upstream pressure
• Prevents downstream demand from sacrificing supply of an upstream zone
• Installations:– In‐line distribution piping– At booster pump stations
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50-01 Pressure Relief Valve
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Rate of Flow Control Valves
• Maintains a maximum
flow rate setting downstream regardless of pressure changes
• Installations:– Within distribution systems– Filter applications– Process control applications
to distribution
automatic control valve
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Example: Electronic Pressure Reducing
• Application: Electronic Pressure
Reducing/Pressure Sustaining Valve in packaged vault
• Equipped with electronic actuator
• Feeds community and elevated tank located 2+ miles from
vault
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Hydraulic Level Control Valves
• Designed to shut‐off when the reservoir reaches a high
level setting
• Float or floatless configurations
• Installations:– Elevated tanks
– Above and underground storage tanks and
reservoirs
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Altitude Valve VariationsGraphicGraphic
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This insures that waterfills the tank, only when desired-time clock, or command from SCADA.
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Cavitation Control
• Cavitation
is common in applications with high pressure
differentials or high flow rates• Cavitation
damage can be
catastrophic• Automatic Control valves can be
equipped with special trim to prevent cavitation, without
removal of the valve from the pipeline
• Integral cavitation
protection is one of the easiest and most effective
ways to prolong valve life
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Anti-Cavitation Valve
Applications
Anti-Cavitation Valve
Applications
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Pump Control Applications
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Pump Control Valves • Booster Pump Control Valve:
– Pump starts against a closed valve
– Valve opens slowly as pump starts, gradually increasing line pressure to full pump head
– Valve closes gradually when pump is signaled to shut‐off
– Prevents reverse flow and water hammer
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PowercheckPowercheck Main ValveMain ValveModel 100Model 100--03 03 BuiltBuilt--In lift type In lift type
check valvecheck valve
Spring in cover 10Spring in cover 10”” and smallerand smaller
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60-11 Booster Pump Control Valve
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Installation: Rialto, CAInstallation: Rialto, CA
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What is Surge?What is Surge?
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Research Test SetResearch Test Set--UpUp
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Test Curve With No Relief ValveTest Curve With No Relief Valve
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50 Series Pilot System unmodified50 Series Pilot System unmodified
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Test Curve With 50 Series Relief ValveTest Curve With 50 Series Relief Valve
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50 Series Pilot System with 50 Series Pilot System with ModificationModification
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Test Curve With Modified Test Curve With Modified 50 Series Relief Valve50 Series Relief Valve
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5252--03 Surge Anticipator Control Valve03 Surge Anticipator Control Valve
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Surge Anticipator Control Valve
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SCADA Interface
131 Series Electronic Control Valves
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Electronic Control Valves can do it all
On / Off Control Pressure Control
Level Control
ValvePosition Control
Flow Control
Blending Control
Combinations System Status
Automatic Control
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Enhancing Control Capabilities
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Ball and Butterfly valves …• …have limited range, limited
capabilities• …are less durable• …are more expensive to
maintain
You can get the control you need
The best solution is Cla‐Val
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Advantages of Cla-Val Automatic Control Valves over actuated ball
valves and butterfly valves
1.
Greater range of control in modulating applications
2.
Infinite positioning capabilities3.
Less susceptible to cavitation
4.
Field retrofittable
anti‐cavitation
trim for existing valves
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5.
Do not rely on external device to operate6.
Back‐up hydraulic functionality
7.
Less costly to maintain8.
Can perform multiple functions, such as
pressure reducing and metering in a single valve
Advantages of Cla-Val Automatic Control Valves over actuated ball
valves and butterfly valves
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Example: Electronic Pressure Reducing with Metering
• Application: PRV station with two valves feeding drinking
water system and filling two elevated tanks downstream of
station• Electronic pressure reducing
valves provide a wider range of pressure control as
compared to actuated ball valves
• Electronic control valves were equipped with integral
metering capability
• Built‐in hydraulic controls enable the
valves to continue operating in the event
of a power failure
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Electronic Control Valve Capabilities
• Automatic and Electronic Control Valves are smarter than ever
• They can be configured to perform multiple functions with one valve
• They become the “brains of the operation” when it comes to equipment
• Control valve manufacturers have the capability of creating custom solutions to
meet unique requirements
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Electronic Control Valves
• Designed for applications where remote control is
desired
• Can be set‐up to perform one or multiple functions
• Can be combined with hydraulic control for fail‐
safe operation
• Easy interface with SCADA
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133-01 Flow Metering Kit
►
Add to any NEW or existing Cla-Val control valve
►
131VC-3T Programmed for all Cla-Val valves
►
Built-in local display and retransmission to SCADA
►
Custom-made and easy to install
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133133--01 Metering & Control 01 Metering & Control ValveValve
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Filter BackwashingFilter Backwashing
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Improved Filter Backwashing
Backwash Line
Finished Water
WTP FilterElectronic Metering Valve with
Anti-Cavitation Trim
High Pressure Water Source
Raw Water
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Example: Electronic Modulating Level Control
• Application: Single valve controls flow and performs
metering• Interfaces with plant’s
control system• Alleviates the need for
separate metering devices• Maintains a constant level
in tanks & reservoirs• Helps meet regulatory
requirements • Takes less space than otheroptions
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Example: Electronic Modulating Level Control
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Example: Electronic Reservoir Fill Valves
• Application: Filling of multiple above ground
reservoirs
• Equipped with electronic pilot system for
sustaining control
• Completely self‐sufficient solution for reservoir
filling
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Example: Electronic Reservoir Fill Valves
• Application: Filling of underground reservoir
• Electronic communication from level transmitters to valve controllers to open
and close valve in accordance with filling
requirements• Provides completely
remote filling with or without SCADA
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Example: Electronic Flow Control
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Example: Electronic Source Blending with Metering
• Flow meters on each line provide feedback to an electronic valve controller, which modulates the ratio control valve
• A cap flow control valve serves to limit the well maximum output and control startup surges
Application: A combination of
automatic control valves are used to control a
blend ratio from two water sources:
• One treated• One raw
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Example: Electronic Partial Treatment Blending with Metering
• For partial treatment blending, an electronic ratio control valve is used to proportionally split the flow so that one portion is treated to remove undesirable compound (such as arsenic) and the
remaining raw water is remixed after the treatment process to provide water for the distribution system that meets regulatory requirements
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Austin TX Filter Butterfly valve replacement with Cla‐Val 133 Series Electronic Control Valve
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The Best of Both Worlds: Electronic Control with Hydraulic Back-Up
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Position Control Valve
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Electronic Positioning Level Control
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Example: Electronic Position Control
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Battery-Powered Timer Controlled Bypass
Inactive gate valve bypass
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Valve-Based Onsite Power Generation
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Typical Application
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Valve-Based Power Generation
• Provides power by using the pressure drop across a PRV to run a generator
• Compact design easily adapts to small, pre‐ existing vaults or new installations
• No down time due to cloudy days• Applications include powering electronic
control valves, RTUs, monitoring equipment, sump pumps, lighting, and for pressure
management
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On the drawing board…
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Flow Meter Alternative
• Alleviates the need for a separate metering device
• Can be retrofitted to existing, installed
automatic control valves
• Takes less space and is less costly than other
metering option
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