Watts LFB6781 User Manual
For Commercial and Industrial Applications
ES-LFB6780
Job Name
Job Location
Engineer
Approval
LEAD FREE
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*
Series LFB6780,
LFB6781
2-Piece, Full Port,
Lead Free
Sizes: 1⁄4" – 2" (8 – 50mm)**
Series LFB6780, LFB6781 2-Piece, Full Port, Lead Free* Copper
Silicon Alloy Diverter Ball Valves are designed to divert liquids and
gases in commercial and industrial applications. The LFB6780,
LFB6781’s full port orifice ensures minimal pressure drop, while
PTFE seats and stainless steel ball provide lasting service. The
LFB6780, LFB6781 features Lead Free* construction to comply
with Lead Free* installation requirements.
*
Diverter Ball Valves
Contractor
Approval
Contractor’s P.O. No.
Representative
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LFB6780
Features
•Suitable for a full range of liquids and gases.
•Minimal pressure drop due to full size ports
•Blowout proof pressure retaining stem
• Pressure rated at 400psi (28 bars) WOG non-shock @ 100°F
(38°C); 125psi (8.6 bars) WSP
•Virgin PTFE stem packing seal and thrust bearing
•Vinyl insulator on heavy duty, zinc-plated carbon steel handles
•Low operating torque
•Adjustable stem packing gland
•Each valve factory tested
Models
LFB6780 1/4" – 2" (8 – 50mm)** threaded NPT end connections
1
LFB6781
/2" – 1" (15 – 25mm)** solder end connections
Specifications
A 2-Piece full port Lead Free* diverter ball valve to be installed
as indicated on the plans. Lead Free* 2-Piece, Full Port, Copper
Silicon Alloy Diverter Ball Valves, shall be constructed using Lead
Free* materials. Lead Free valves shall comply with state codes
and standards, where applicable, requiring reduced lead content.
The valve must have a blowout proof pressure retaining stem,
stainless steel ball, PTFE seats, virgin PTFE stem packing seal and
adjustable packing. Pressure rating no less than 400psi (28 bars)
WOG non-shock, 125psi (8.6 bars) WSP. Valve shall be a Watts
Series LFB6780 (threaded) or LFB6781 (solder).
Pressure – Temperature
Temperature Range: 0°F - 350°F (-18°C – 177°C) @ 50psi (3.5 bars)
Maximum Working Pressure: 400psi (28 bars) WOG non-shock @
100°F (38°C); 125psi (8.6 bars) WSP
LFB6781
0° Rotation 45° Rotation 90° Rotation
Options
Suffix
SH – Stainless steel handle & nut
*The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.
**Metric Dimensions are nominal pipe diameter. This product is
produced with NPT threaded or solder end connections.
***This valve is designed to be soft soldered into lines without
disassembly, using a low temperature solder 420°F (216°C). Other
solders such as 95/5 tin antimony 460°F (238°C) or 96/4 tin silver
420°F (216°C) can be used, however extreme caution must be
used to prevent seat damage. Higher temperature solders will
damage the seat material. ANSI B.16.18 states that the maximum
operating pressure of 50-50 solder connections is 200 psi (14
bars) at 100°F (38°C) and decreases with higher temperatures.
Apply heat with the flame directed AWAY from the center of the
valve body. Excessive heat can harm the seats. After soldering,
the packing nut may have to be tightened.
Watts product specifications in U.S. customary units and metric are approximate and are provided for reference only. For precise measurements,
please contact Watts Technical Service. Watts reserves the right to change or modify product design, construction, specifications, or materials without prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
Materials
-17.810386693 121 149 177 204 232 °C
bar psi
A
B
C
D
G
H
E
F
I
H
K
J
A Handle Nut Zinc Plated Carbon Steel
B Handle Zinc Plated Carbon Steel with Vinyl Insulator
C Packing Nut Brass
D Stem Packing PTFE
E Thrust Bearing PTFE
F Stem Stainless Steel
G Body Lead Free Copper Silicon Alloy
H Seats PTFE
I Ball Stainless Steel
J Adapter Lead Free Copper Silicon Alloy
K Body Seal PTFE (1
1
⁄4" – 2")
Dimensions — Weights
H
C
I
E
J
T
L
S
Valve Seat Rating
41.34 600
34.45 500
27.56 400
20.67 300
13.78 200
Pressure
6.90 100
3.45 50
50 100 150 200 250 300 350 400 450 °F
Temperature
Valve Torque Rating
SIZE DN RATING OPERATING TORQUE
in. mm** Cv in./lbs. N-m
=1⁄4, 3⁄8 8-10 4.8 60 6.8
1
⁄2 15 4.8 60 6.8
3
⁄4 20 11 150 16.9
1 25 21 200 22.6
1
⁄4 32 33 250 28.2
1
1
⁄2 40 49 320 36.2
1
2 50 91 500 56.5
=
Threaded only
Pressure Drop vs. Flow
bars ps i
1.420
.7 10
.6 8
.4 6
.3 4
.2 3
.1 2
.07 1
.06 .8
.04 .6
Pressure Drop
.03 .4
.02 .3
.01 .2
.01 .1
2 7.6
1 3.8
3 11.4
4 15.2
6 22.8
"
2
/
1
",
8
/
3
",
4
/
1
/
3
10 38
8 30.4
"
4
20 76
30 114
/
/
1
1
"
1
40 152
2"
1
1
gp mlpm
1000 3800
800 3040
600 2280
400 1520
300 1140
200 760
100 380
80 304
60 228
"
"
2
4
LFB6780
SIZE (DN) DIMENSIONS WEIGHT
C E H I J L S T
Center Center Radius Ball Orifice Dia. Solder End to End Diameter Center
to Handle to End of Handle Connection to Side
in. mm** in. mm in. mm in. mm in. mm in. mm in. mm in. mm in. mm lbs. kg.
1
⁄4, 3⁄8, 1⁄2 8,10,15 15⁄8 41.3 11⁄4 31.7 33⁄4 95.3 1⁄2 12.7 - - 29⁄32 57.9 11⁄4 31.7 11⁄4 31.7 .66 .30
3
⁄4 20 13⁄4 44.5 19⁄16 39.7 33⁄4 95.3 3⁄4 19.1 - - 213⁄16 71.4 119⁄32 40.5 19⁄16 39.7 1.00 .45
1 25 2
1
1
⁄4 32 213⁄16 71.4 21⁄16 52.4 51⁄2 139.7 11⁄4 31.8 - - 41⁄8 104.7 23⁄4 69.8 21⁄16 52.4 4.00 1.81
1
1
⁄2 40 3 76.2 27⁄32 56.3 51⁄2 139.7 11⁄2 38.1 - - 47⁄16 112.7 23⁄16 55.5 27⁄32 56.3 5.50 2.49
2 50 4 101.6 2
1
⁄16 52.4 17⁄8 47.6 33⁄4 95.3 1 25.4 - - 39⁄16 90.5 21⁄8 54.0 17⁄8 47.6 1.88 .85
11
⁄16 68.2 8 203.2 2 50.8 - - 53⁄8 136.5 41⁄16 103.2 211⁄16 68.2 10.00 4.54
Flow
***LFB6781
1
⁄2 15 15⁄8 41.3 11⁄8 28.6 33⁄4 95.3 1⁄2 12.7 5⁄8 15.8 25⁄16 58.7 11⁄4 31.7 11⁄8 28.6 .66 .30
3
⁄4 20 13⁄4 44.5 19⁄16 39.7 33⁄4 95.3 3⁄4 19.1 7⁄8 22.2 33⁄16 80.9 119⁄32 40.5 19⁄16 39.7 1.00 .45
1 25 2
***See Solder Instructions on front.
NOTE: Seat rating based on pressure entering side port.
A Watts Water Technologies Company
ES-LFB6780 1323 © 2013 Watts
1
⁄16 52.4 115⁄16 49.1 33⁄4 95.3 1 25.4 11⁄8 28.6 37⁄8 98.4 21⁄8 54.0 115⁄16 49.1 1.88 .85
**Metric Dimensions are nominal pipe diameter. This product is produced with NPT threaded or solder end connections.
USA: Tel: (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Tel: (905) 332-4090 • Fax: (905) 332-7068 • www.watts.ca
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