Watts LFS777 User Manual
For Liquid and Steam Service
ES-LF777
Job Name
Job Location
Engineer
Approval
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LEAD FREE
*
Contractor
Approval
Contractor’s P.O. No.
Representative
Series LF777,
LFS777
Wye-Pattern Lead Free* Bronze
Strainers
Sizes: 1⁄4" – 4" (8-100mm)
Series LF777, LFS777 Wye-Pattern Lead Free* cast copper silicon
alloy Strainers are designed to protect system components from
dirt, rust and other damaging debris in the piping system. This series
features a solid retainer cap with gasket. The LF777 and LFS777 features Lead Free* construction to comply with Lead Free* installation
requirements.
Features
• Lead Free* cast copper silicon alloy body
• Wye-pattern
• Solid retainer cap with gasket
Models
LF777 – 1⁄4" – 4" (8 – 100mm) threaded connections
LFS777 –
Specifications
A wye-pattern Lead Free* cast copper silicon alloy strainer to be
installed as indicated on the plans. The strainer must have a solid
retainer cap with gasket. Strainer shall be rated to 400psi (27.6
bar) WOG @ 210ºF (99ºC); 125psi (8.6 bar) WSP @ 353ºF (178ºF)
for sizes
(99ºC); 125psi (8.6 bar) @ 353ºF (178ºC) for size 4" (100mm). Lead
Free* Wye-Pattern cast copper silicon alloy Strainers shall be constructed using Lead Free* materials. Lead Free strainers shall comply
with state codes and standards, where applicable, requiring reduced
lead content. Strainer shall be a Watts Series LF777 (threaded ends)
or LFS777 (solder ends).
Materials
Body: Lead Free* cast copper silicon alloy
Retainer Cap:
Cap Gasket:
Standard Screen:
1
⁄2" – 2" (15 – 50mm) solder connections
1
⁄4" – 3" (8 – 75mm) and 300psi (20.7 bar) WOG @ 210ºF
1
⁄4" – 4" (8-100mm): Lead Free copper silicon alloy
1
⁄2" – 2" (15-50mm): EPDM
Other sizes consult factory
1
⁄2" – 21⁄2" (8-65mm): 304 stainless steel
#20 mesh,
3" (75mm):
forated screen
4" (100mm):
perforated screen
3
⁄64" (1.2mm) 304 stainless steel per-
1
⁄8" (3mm) 304 stainless steel
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LF777
LFS777
BAA/ARRA Compliant
**This product complies with the Buy American Act and The
American Recovery and Reinvestment Act. For more information,
visit watts.com.
**
Pressure – Temperature
Maximum Working Pressure:
1
⁄4" – 3" (8-75mm)
400psi (27.6 bar) WOG @ 210ºF (99ºC)
125psi (8.6 bar) WSP @ 353ºF (178ºF)
4" (100mm)
300psi (20.7 bar) WOG @ 210ºF (99ºC)
125psi (8.6 bar) WSP @ 353ºF (178ºF)
*The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.
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.
Screen Options
304 Stainless Steel Wire Mesh Liners:
(#30, #40, #60, #80, #100)
304 Stainless Steel Perforated Screens:
1
⁄32", 3⁄64", 1⁄16", 1⁄8", 3⁄16", 1⁄4")
(
Consult factory for ordering codes
Performance Data
1000
400
200
100
80
60
40
30
20
10
8
Flow (water) - gpm
6
5
4
3
2
1
0.1 .2 .3 .4 .5 .6 .8 1 2 3 4 5 6 8 10 20 20 40 50 60 80 100
4” 3” 21⁄2
Pressure Drop - psi
2”
1
⁄2”
1
1
⁄4”
1
1”
3
⁄4”
1
⁄2”
3
⁄8”
1⁄
4”
Strainer Size
Dimensions – Weights
A
Inlet
B
LF777
A
B
LF777
SIZE (DN) DIMENSIONS WEIGHT
A B
in. mm in. mm in. mm lbs. kgs.
1
⁄4 8 211⁄16 68 111⁄16 43 1.7 0.77
3
⁄8 10 211⁄16 68 111⁄16 43 1.7 0.77
1
⁄2 15 3 76 2 51 1.7 0.77
3
⁄4 20 35⁄16 84 25⁄16 59 1.7 0.77
1 25 4
1
1
⁄4 32 51⁄8 130 31⁄8 79 3.0 1.36
1
1
⁄2 40 57⁄8 149 33⁄4 95 4.0 1.81
2 50 6
1
2
⁄2 65 81⁄8 206 415⁄16 125 12.0 5.44
3 75 10
4 100 13 325 10
1
⁄2 114 25⁄16 59 2.7 1.22
3
⁄16 157 47⁄8 124 7.4 3.36
1
⁄8 257 611⁄16 170 24.0 10.90
1
⁄2 267 41.0 18.60
LFS777
SIZE (DN) DIMENSIONS WEIGHT
A B
in. mm in. mm in. mm lbs. kgs.
1
⁄2 15 33⁄8 86 21⁄16 52 1.5 0.68
3
⁄4 20 33⁄4 95 27⁄16 63 1.6 0.73
1 25 5 127 3 76 2.5 1.13
1
1
⁄4 32 55⁄8 143 31⁄4 82 2.8 1.25
1
1
⁄2 40 67⁄16 164 313⁄16 97 4.0 1.81
2 50 7
1
⁄2 191 45⁄8 118 7.4 3.39
LFS777
A Watts Water Technologies Company
USA: Tel: (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Tel: (905) 332-4090 • Fax: (905) 332-7068 • www.watts.ca
ES-LF777 1326 © 2013 Watts
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