Watts 77SI User Manual
For Commercial and Industrial Applications
ES-77SI
Job Name
Job Location
Engineer
Approval
LEAD FREE
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*
Series 77SI
Wye-Pattern Cast Iron
Threaded Strainers
Sizes: 1/4" – 3" (8-80mm)
The Series 77SI Threaded, Wye-Pattern, Cast Iron Strainers
are manufactured overseas. These strainers are designed to
protect system components from dirt, rust, and other damaging debris in the piping system. Series 77SI strainers 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.
Contractor
Approval
Contractor’s P.O. No.
Representative
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No. 77SI
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Features
• Cast iron body
• Wye-pattern
• Tapped retainer cap
• Threaded connections
Pressure – Temperature
Maximum Working Pressure:
400psi (27.6 bar) at 150ºF (66º C) 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) at 150ºF (66ºC) WOG; 250psi (17.2 bar) at 406ºF
(208ºC) WSP. Strainer shall be a Watts Series 77SI.
Materials
Body: Cast iron
Retainer Cap: Cast iron
Standard Screen:
2
304 stainless steel perforated screen
Gasket: PTFE
1
/4" – 2" (8-50mm): 304
stainless steel #20 mesh,
1
/2"- 3" (65-80mm): 3/64" (1.2mm)
*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.
Performance Data
Table shows flow rates (gpm) at various pressure drops (psi)
for 77SI strainers using standard screens.
500
in. mm
3 80
1
⁄2 65
2
2 50
Inlet
100
10
Flow (water) - gpm
1
11⁄2 40
1
1
⁄4 32
1 25
3
⁄4 20
1⁄
2
3⁄
8
1⁄
4
15
10
8
A
NPT
Threads
Strainer Size
0.1
B
0.1 1 10
Pressure Drop - psi
Flow-coefficient
The flow coefficient (Cv) is the number of gallons per minute
of water flowing through a given size restriction at a pressure
drop on one psi. To obtain the Cv factor for a given size strainer,
Cap
C
NPT
read capacity at intersection with the one (1) psi pressure drop.
Conversions: For gpm to lpm, multiply by 3.8
For psi to bars, multiply by .069
Dimensions — Weights
SIZE (DN) DIMENSIONS WEIGHTS
A B C (NPT)
in. mm in. mm in. mm in. mm lbs. kgs.
1⁄4 8 33⁄16 81 21⁄16 52
3
⁄8 10 33⁄16 81 21⁄16 52
1
⁄2 15 33⁄16 81 21⁄16 52
3
⁄4 20 33⁄4 95 27⁄16 62
1 25 4 102 2
1
1
⁄4 32 5 127 33⁄8 86
1
1
⁄2 40 53⁄4 146 37⁄8 98
2 50 7 178 4
1
2
⁄2 65 91⁄4 235 57⁄8 149 1 25 22.0 10.0
7
⁄16 62
3
⁄4 121
3 80 10 254 6 152 1
1
⁄4 8 1.5 0.7
1
⁄4 8 1.5 0.7
1
⁄4 8 1.5 0.7
3
⁄8 10 2.5 1.1
3
⁄4 20 3.0 1.4
3
⁄4 20 5.5 2.5
3
⁄4 20 8.0 3.6
3
⁄4 20 13.0 5.9
1
⁄4 40 30.0 13.6
A Watts Water Technologies Company
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
ES-77SI 0936 © Watts, 2009
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
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