Watts 77F-CSI User Manual
For Commercial and Industrial Applications
ES-77F-CSI
Job Name
Job Location
Engineer
Approval
LEAD FREE
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Series 77F-CSI
Cast Steel, Flanged,
Wye-Pattern Strainers
Sizes: 1/2” – 6” (15 - 150mm)
Series 77F-CSI Steel, Flanged, Wye-Pattern Strainers are used
in liquid and steam applications. Series 77F-CSI 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 complete bolted screen retainer cover and PTFE
gasket. Screen retainer cover is tapped for strainer clean out
by removing the blowdown plug or opening a blowdown valve
piped to the blowdown outlet. The strainer may 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-CSI
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Features
• Grade WCB steel body
• Wye-pattern
• Self-aligning stainless steel screen
• Screen retainer cover tapped and plugged
• Flanged connections
Pressure (Non-Shock)-Temperature
Maximum Working Pressure:
150psi (10.3 bar) at 400°F (204°C) WSP
285psi (19.6 bar) at 100°F (38°C) WOG
Materials
Body: ASTM A-216
Plug: ASTM A-105
Screen: 304 stainless steel
Screen Retainer Cover: ASTM A-216
Gasket: PTFE
Grade WCB cast steel
*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
SIZE OPENINGS STANDARD SCREENS
in mm in mm
1
/2 - 11/2 15-40 0.032 0.813
2 - 3 50-80 0.045 1.143
4 - 6 100-300 0.125 0.317
1
⁄32 304SS perf.
3
⁄64 304SS perf.
1
⁄8 304SS perf.
Performance Data
Table shows flows (gpm-water) at various pressure drops (psi)
using standard screens.
6 150
5 125
A
Inlet
B
C
NPT
Dimensions — Weights
SIZE DIMENSIONS WEIGHTS
A B C (NPT)
in. mm in. mm in. mm in. mm lbs. kgs.
1⁄2 15 6 152 37⁄8 98 1⁄4 8 6 2.4
3
⁄4 20 7 178 41⁄4 108 3⁄8 10 7 2.9
1 25 7
1
1
⁄2 40 9 229 55⁄8 143 1⁄2 15 12 5.4
2 50 8
1
2
⁄2 65 101⁄4 260 71⁄2 191 3⁄4 20 32 14.5
3 80 11
4 100 14
5 125 17
6 150 18
Dimensions shown are subject to change.
Contact Watts for exact dimensions when required.
1
⁄2 191 43⁄4 121 1⁄2 15 9 4.0
5
⁄8 219 51⁄4 133 1⁄2 15 20 9.0
5
⁄8 295 7 178 1 25 36 16.3
3
⁄8 365 91⁄8 232 11⁄2 40 61 27.6
5
⁄8 448 11 279 2 50 110 49.8
5
⁄8 473 13 330 2 50 160 72.5
1000
100
Flow (water) - gpm
10
1
.7
0.1 1 10
4 100
3 80
1
2
⁄2 65
2 50
1
1
⁄2 40
11⁄4 32
1 25
3
⁄4 20
1
⁄2 15
Strainer Size
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 of one psi. To obtain the Cv factor for a given size strainer, read capacity at intersection with the one (1) psi
pressure drop.
Conversions: For gpm to lpm, multiply by 3.8. For psi
to bar, multiply by .069
A Watts Water Technologies Company
Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscanada.ca
ES-77F-CSI 0936 © Watts, 2009
USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.watts.com
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