a discussion on the use of rw gate valves
TRANSCRIPT
10
VALVE SELECTION
• START - EARLY IN THE PROJECT
• AVOID - USING OLD PROJECT SPECS
• AVOID - USING WHAT WAS USED LAST TIME
• LOOK - AT BIGGER PICTURE
• LOOK - AT EACH PROJECT ON ITS OWN MERIT
12
FLUID MEDIUM
HISTORICALLY –
RAW WATER: GATE VALVESBUTTERFLY VALVES
RE-USE WATER: GATE VALVESBUTTERFLY VALVES
TREATED WATER: GATE VALVESBUTTERFLY VALVES
WASTEWATER: GATE VALVES - VERTICALPLUG VALVES
17
BUTTERFLY VALVES
AMERICAN MANUFACTURED BUTTERFLY VALVES (BFV) THROUGH 84”
DISCONTINUED PRODUCTION IN 1994.
EXPERIENCED IN MANUFACTURING BOTH BFV AND LARGE DIAMETER GATE VALVES
26
BUTTERFLY VALVES - REVIEW
PUMPING COST – 10X GREATER
PUMPING COST = QHRT5309e
Where: Q = Flow Rate, GPM
H = Head Loss, Ft of Water
R = Electricity Rate , Assumption $0.10 per KW
T = Average Yearly Pumping Time / Assumption 8760 Hrs
e = Pump Efficiency, Assumption 0.80
28
BUTTERFLY VALVES - REVIEW
OTHER COSTS TO REPLACE VALVE
DE-WATER & RE-FILL
EXCAVATION
LABOR AND MATERIALS
POTENTIAL LINE CONTAMINATION
29
GATE VALVE - HISTORY
DOUBLE DISC GATE VALVES
• Originally Covered by ANSI/AWWA C500
• Arbitrary Wall Thicknesses
• Closure Achieved by a “Bridging Action”
• Limited Coating
• Pockets
• Build-Up in Seats
• Elevated Torques – Required By-Passes
• Allowable Leakage - 1 oz – per inch – per hour
30
GATE VALVE - HISTORY
• Susceptible to build-up• Susceptible to corrosion• Lower pressure ratings• Prone to damage• Multiple parts
32
RW GATE VALVE - HISTORY
RESILIENT WEDGE GATE VALVES
• Development of ANSI/AWWA C509
• Fusion-Bond Epoxy (FBE) Inside and Out
• Smooth Waterway
• Single Piece Encapsulated Wedge
• Elevated Pressure Rating to 200 psig
• Zero Leakage
33
RW GATE VALVE - HISTORY
RESILIENT WEDGE GATE VALVES
• Development of ANSI/AWWA C515
• Use of DI (65-45-12) = Lighter / Stronger
• Smooth Waterway
• Single Piece Fully Encapsulated EPDM Wedge
• Elevated Pressure Rating to 250 psig
34
AWWA C-500 - METAL SEATEDAllowable Leakage @ 150 psig (14” and Larger)
Heavy Wall Thickness
AWWA C-509 – RESILIENT SEATEDGray Cast Iron BodyZero LeakagePressure Rating @150 psig (14” and Larger)
Heavy Wall Thickness
AWWA C-515 - RESILIENT SEATEDDuctile Iron BodyZero LeakagePressure Rating @ 200 psig (AMERICAN = 250 psig)Reduced Wall ThicknessLighter Weight / Easier to Handle
AWWA STANDARDS
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RW GATE VALVE - REVIEW
• Every Valve Test to 250 psig• Lifting devices• Integral feet for
Vertical Storage or Installation•Bevel or Spur Gearing•Sizes 2” thru 66”
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A Boltless Restrained Joint RW Gate Valve
Available in Size 16” -48”
Photo Placement Here
AMERICAN SERIES 2500 with FLEX-RING® JOINTS
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Positive Joint Restraint
Photo Placement Here
Fastite Gasket
Restraining Weld Bead
Rubber BackedFlex-Ring Segments
Fastite Gasket
Restraining Weld Bead
Rubber BackedFlex-Ring Segments
AMERICAN SERIES 2500 with FLEX-RING® JOINTS
64
No bolts and nuts to inventory, install, or tighten
F E A T U R E S
ValveSize
WedgeBolts
MJ TeeHead Bolts
TotalBolts
16”18”20”24”30”36”42”48”
1212141620242832
1212141620242832
2424283240485664
Friction Style MJ - Restrainers
65
Up To Twice the Deflection of Friction Style MJ - Restrainers
Size Allowable Deflection (Degrees)
16” 3 ¾
18” 3 ¾
20” 3 ½
24” 3
30” 2½
36”- 48” 2
F E A T U R E S
67
No twist off restraining bolts to break
F E A T U R E SAMERICAN SERIES 2500 with FLEX-RING® JOINTS
68
No point loads or digging into the connecting DI pipe wall
AMERICAN SERIES 2500 with FLEX-RING® JOINTS
70
Restraining components remain protected inside valve joint
F E A T U R E SAMERICAN SERIES 2500 with FLEX-RING® JOINTS
71
AMERICAN SERIES 2500 with FLEX-RING® JOINTS
ASSEMBLY LOAD“RESTRAINT” FORCE OF FLEX-RING® SEPARATION THRUST
72
In-Field Adaptability Available Thru 36” Diameter
Standard Fastite®
Gasket
American Flex-Ring®
Ductile Iron Pipe Bell
Field Flex-Ring®
Used when Spigot Weld Bead
is unavailable
AMERICAN SERIES 2500 with FIELD FLEX-RING® JOINTS