Watts 77F-BI User Manual
For Commercial and Industrial Applications
ES-77F-BI
Job Name
Job Location
Engineer
Approval
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Series 77F-BI
Bronze, Flanged, Wye-Pattern
Strainers
Sizes: 2" – 8" (50 - 200mm)
Series 77F-BI Bronze, Flanged, Wye-Pattern Strainers are used
in liquid and steam applications. Series 77F-BI are furnished
with blowdown connections and machined seat that allows the
screen to be self-aligning and assures a perfect fit. All sizes
come with a bolted screen retainer cover and PTFE gasket.
The screen retainer cover is NPT tapped for a blowdown plug
that is provided. The strainer is easily cleaned by removing
the blowdown plug or opening a blowdown valve piped to the
blowdown outlet. Series 77F-BI can be installed in horizontal or
vertical pipe with the blowdown connection at the lower end of
the screen retainer cover.
Contractor
Approval
Contractor’s P.O. No.
Representative
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No. 77F-BI
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Features
• Class 150 bronze body
• Flanged wye-pattern
• Self-aligning stainless steel screen
• Screen retainer cover tapped and plugged
Pressure (Non-Shock)-Temperature
Maximum Working Pressure:
150psi (10.3 bar) at 406°F (208°C) WSP
225psi (15.5 bar) at 150°F (66°C) WOG
Materials
Body: ASTM B-62 cast bronze
Plug: ASTM B-62 cast bronze
Screen: 304 stainless steel
Screen Cover: ASTM B-62 cast bronze
Gasket: PTFE
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
SIZE OPENINGS STANDARD SCREENS
in. mm in. mm
2 - 3 50-80 0.045 1.143
4 - 8 100-200 0.125 0.317
3
⁄64 304SS perf.
1
⁄8 304SS perf.
Performance Data
Table shows flow rates (gpm-water) through 77F-BI at various
pressure drops (psi) using standard screens.
4000
in. mm
8 200
6 150
5 125
Inlet
1000
Flow (water) - gpm
100
10
0 1 10
A
Pressure Drop - psi
4 100
3 80
21⁄2 65
21⁄4 57
2 50
Strainer Size
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 of one psi. To obtain the Cv factor for a given size
strainer, read capacity at intersection with the one (1)
psi pressure drop.
B
Conversions: For gpm to lpm, multiply by 3.8
For psi to bar, multiply by .069
C
NPT
Dimensions — Weights
SIZE DIMENSIONS WEIGHT
A B C (NPT)
in. mm in. mm in. mm in. mm lbs. kgs.
2 50 85⁄8 219 51⁄4 133
21⁄2 65 101⁄4 260 7 178
3 80 115⁄8 295 711⁄16 195 1 25 36 16.3
4 100 143⁄8 365 91⁄8 232 11⁄2 40 61 27.6
6 150 185⁄8 473 13 330 2 50 160 72.5
8 200 243⁄8 619 155⁄16 389 2 50 210 95.2
Dimensions shown are subject to change. Contact Watts for exact dimensions
A Watts Water Technologies Company
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
ES-77F-BI 1003 © 2010 Watts
1
⁄2 15 20 9.0
3
⁄4 20 32 14.5
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
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