Watts 77S User Manual
For Residential and Commercial Applications
ES-77S-M1
Job Name
Job Location
Engineer
Approval
LEAD FREE
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Series 77S M1
Cast Iron, Wye-Pattern Strainers
Sizes: 1/4" – 3" (8-80mm)
The Series 77S Threaded, Wye-Pattern, Cast Iron Strainers
are manufactured by Watts. These strainers are designed to
protect system components from dirt, rust, and other damaging debris in the piping system. Series 77S are used in steam
and liquid applications. They are furnished with a machined
seat that allows the screen to be self-aligning to assure a
perfect fit. All sizes come with a PTFE gasket, threaded screen
retainer cap, tapped blowdown connection, and an easily removable stainless steel screen. Blowdown plug is not furnished.
Features
Contractor
Approval
Contractor’s P.O. No.
Representative
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No. 77S
BAA/ARRA Compliant
**This product complies with the Buy American Act and The
American Recovery and Reinvestment Act. For more information,
visit watts.com.
**
• Cast iron body
• Wye-pattern
• Tapped retainer cap
• Threaded connections
Pressure – Temperature
Maximum Working Pressure:
400psi (27.6 bar) at 150ºF (66ºC) WOG
250psi (17.2 bar) at 406ºF (208ºC) WSP
Specifications
A wye-pattern cast iron strainer to be installed as indicated
on the plans. The strainer must have a tapped retainer cap and
threaded end connections. Strainer shall be rated to 400psi
(27.6 bar) WOG at 150ºF (66ºC); 250psi (17.2 bar) WSP at
406ºF (208ºC). Strainer shall be a Watts Series 77S.
Standards
Complies with MIL-S-16293 Type 1
Materials
Body: ASTM A-126 Class B cast iron
Retainer Cap: ASTM A-126 Class B cast iron
Screen: Stainless Steel
Gasket: PTFE
*The wetted surface of this product contacted by consumable
water contains less than one quarter of one percent (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.
Standard Screens
8mm10mm15mm20mm25mm32mm40mm50
SIZE SCREEN OPENINGS MATERIALS
in. mm
1/4 - 21/2 8-65 20 mesh 304SS
3 80
3
/64"perf 304SS
Options
Wire mesh liners:
304 stainless steel
(#40, #60, #80, #100)
Screens:
1
2
/2"-3" (65-80mm)
1
/32", 1/16", 1/8" (.8, 1.6, 3.2mm)
A
Inlet
NPT
Threads
Performance Data
1
⁄4" - 21⁄2" (8-65mm): #20 Mesh screen
3" (80mm):
For performance data for nonstandard screens and liners,
please consult factory.
100
10
Pressure Drop - psi
1
0.1
Conversions: For gpm to lpm, multiply by 3.8.
80
60
50
40
30
20
8
6
5
4
3
2
.8
.6
.5
.4
.3
.2
1
3
⁄64" perforated screen
1
⁄4"3⁄8"1⁄2"3⁄4"
2 3 4 5 6 8
10
20 30 40 6080
Flow - gpm
For psi to bar, multiply by .069
100
1"11⁄4" 11⁄2" 2"
200 400
mm
1000
21⁄2"
3"
65
mm
80
mm
B
C
Cap
NPT
Dimensions — Weights
MODEL SIZE DIMENSIONS WEIGHTS
A B C (NPT)
In. mm in. mm in. mm in. mm lbs. kgs.
77S M1
77S M1
77S M1
77S M1
1
⁄4 8 3 76 21⁄4 57
3
⁄8 10 3 76 21⁄4 57
1
⁄2 15 3 76 21⁄4 57
3
⁄4 20 35⁄16 84 27⁄16 62
77S M1 1 25 4
77S M1 1
77S M1 1
1
⁄4 32 53⁄16 132 31⁄4 83
1
⁄2 40 57⁄8 149 313⁄16 97
77S M1 2 50 6
77S M1 2
1
⁄2 65 83⁄16 208 51⁄8 130 1 25 15.5 7.0
77S M1 3 80 10
1
⁄2 114 3 76
3
⁄16 157 51⁄4 133
3
⁄16 259 63⁄16 157 11⁄2 40 26.0 11.8
3
⁄8 10 1.3 .6
3
⁄8 10 1.3 .6
3
⁄8 10 1.3 .6
1
⁄2 15 1.7 .8
3
⁄4 20 3.7 1.7
3
⁄4 20 4.6 2.1
3
⁄4 20 6.4 2.9
3
⁄4 20 11.6 5.3
A Watt s Water Technolo gies Company
USA: No. Andover, MA • Tel. (978) 688-1811 • Fax: (978) 794-1848 • www.watts.com
Canada: Burlington, ONT. • Tel. (905) 332-4090 • Fax: (905) 332-7068 • www.wattscanada.ca
ES-77S-M1 1038 © 2010 Watts
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