Watts 77SI - Manual

For Commercial and Industrial Applications
ES-77SI
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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 dam-
aging 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, thread-
ed screen retainer cap, tapped blowdown connection, and an
easily removable stainless steel screen.
Features
• 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) 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: 1 /
4
" – 2" (8-50mm): 304
stainless steel #20 mesh,
2 1 /
2
"- 3" (65-80mm): 3 /
64
" (1.2mm)
304 stainless steel perforated screen
Gasket: PTFE
No. 77SI
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 with-
out prior notice and without incurring any obligation to make such changes and modifications on Watts products previously or subsequently sold.
LEAD FREE
*
*The wetted surface of this product contacted by consumable
water contains less than one quarter of one percent (0.25%) of
lead by weight.