Watts LFS777SI User Manual
For Liquid and Steam Service
ES-LF777SI
Job Name
Job Location
Engineer
Approval
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LEAD FREE
*
Contractor
Approval
Contractor’s P.O. No.
Representative
Series LF777SI, LFS777SI
Wye-Pattern, Lead Free Cast Strainers
NSF Certified to NSF 61 Annex G
Sizes: 3⁄8" – 3" (10-75mm)
Series LF777SI, LFS777SI Wye-Pattern, Lead Free* cast strainers are designed to protect plumbing system components from
dirt, rust and other damaging debris. The Series LF777SI and
LFS777SI feature Lead Free* construction to comply with Lead
Free* installation requirements.
Features
• NSF 61 Annex G certified
• Lead Free* cast copper silicon alloy body and cap
• Wye-pattern
• Tapped retainer cap
• Closure plug
• Special flared screen opening on upstream end to provide
unrestricted flow through the strainer
Models
LF777SI – 3⁄8" – 3" (10 – 80mm) threaded connections
LFS777SI –
1
⁄2" – 2" (15 – 50mm) solder connections†
Pressure – Temperature
Maximum Working Pressure:
3
/8"–2" (10-50mm)
400psi (27.6 bar) WOG @ 210ºF (99ºC)
125psi (8.6 bar) WSP @ 353ºF (178ºC)
1
2
/2"–3" (65-80mm)
300psi (20.7 bar) WOG @ 210ºF (99ºC)
125psi (8.6 bar) WSP @ 353ºF (178ºC)
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LF777SI
Specifications
A wye-pattern, Lead Free* cast strainer to be installed as indicated on the plans. The strainer must have a tapped retainer
cap and closure plug. Strainer shall be rated to 400psi (27.6
bar) WOG; 125psi (8.6 bar) WSP for sizes
300psi (20.7 bar) @ 210ºF (99ºC); 125psi (8.6 bar) WSP @ 353ºF
(178ºC) for sizes 2
structed using Lead Free* cast copper silicon alloy. Lead Free*
strainers shall comply with state codes and standards, where
applicable, requiring reduced lead content. Strainer shall be a
Watts Series LF777SI (threaded ends) or LFS777SI (solder ends).
1
⁄2"-3" (65-80mm). The strainer shall be con-
3
⁄8"-2" (10-50mm) and
Materials
Body: Lead Free* cast copper silicon alloy
Retainer Cap: Lead Free* cast copper silicon alloy
Plug Lead Free* brass
Gasket: NBR
Standard Screen: #20 mesh, 304 stainless steel
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.
* The wetted surface of this product contacted by consumable
water contains less than 0.25% of lead by weight.
Performance Data
100
3
//////
"
1
"
3
"1"
1
1
"1
1
"2"
2
1
"
10
.1
80
60
50
40
30
20
8
6
5
4
3
2
1
.8
.6
Differential Pressure (psi)
.5
.4
.3
.2
8
2
4
4
2
2
3"
2345681020 30 40 6080
1
100
200 400
1000
Flow (gpm)
Flow curves show flows (gpm) and pressure drop (psig) through
Watts Series 777SI, S777SI using standard 20 mesh screen.
Dimensions — Weights
LF777SI
SIZE (DN) DIMENSIONS WEIGHT
A B C
in. mm in. mm in. mm in. mm lbs. kgs.
3⁄8 10 23⁄8 60 15⁄16 33 1⁄4 6 0.4 0.18
1
⁄2 15 23⁄4 70 13⁄8 35 1⁄4 6 0.5 0.23
3
⁄4 20 33⁄16 81 15⁄8 42 1⁄4 6 0.6 0.27
1 25 3
1
1
⁄4 32 47⁄16 113 21⁄2 64 1⁄2 13 1.9 0.86
1
1
⁄2 40 47⁄8 124 3 76 3⁄4 19 2.4 1.09
2 50 5
1
2
⁄2 65 91⁄16 230 57⁄8 149 1⁄2 13 9.8 4.44
3 80 10
3
⁄4 95 21⁄8 54 1⁄2 13 1.1 0.50
15
⁄16 151 39⁄16 91 1 25 4.4 2.00
3
⁄16 259 61⁄4 159 1⁄2 13 13.2 5.99
A
Inlet
B
C
LFS777SI
SIZE (DN) DIMENSIONS WEIGHT
A B C
in. mm in. mm in. mm in. mm lbs. kgs.
1⁄2 15 23⁄4 70 13⁄8 35 1⁄4 6 0.4 0.18
3
⁄4 20 33⁄8 86 15⁄8 42 1⁄4 6 0.6 0.27
1 25 3
1
1
⁄4 32 49⁄16 116 21⁄2 64 1⁄2 13 1.5 0.68
1
1
⁄2 40 55⁄16 135 3 76 3⁄4 19 1.9 0.86
2 50 6
3
⁄4 95 21⁄8 54 1⁄2 13 0.9 0.41
1
⁄8 156 39⁄16 91 1 25 3.3 1.50
A Watts Water Technologies Company
ES-LF777SI 1326 © 2013 Watts
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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