Buying Guide
35
NIBCO INC. WORLD HEADQUARTERS • 1516 MIDDLEBURY ST. • ELKHART, IN 46516-4740 • USA • PH: 1.800.234.0227
TECH SERVICES PH: 1.888.446.4226 • FAX: 1.888.336.4226 • INTERNATIONAL OFFICE PH: +1.574.295.3327 • FAX: +1.574.295.3455
www.nibco.com
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AHEAD OF THE FLOW
®
Revised 7/20/2018
Class 300 Bronze Check Valves
Horizontal Swing • Regrinding Type • Renewable Seat and Disc • Y-Pattern
300 PSI/20.7 bar saturated steam to 421°F/216°C
600 PSI/41.4 bar non-shock cold working pressure
CONFORMS TO MSS SP-80
T-473
Threaded
T-473-B
NPT x NPT
T-473-Y
NPT x NPT
MATERIAL LIST
PART SPECIFICATION
1. Bonnet Bronze ASTM B 61
2. Body Bronze ASTM B 61
3. Hinge Pin
Bronze ASTM B 140 Alloy C31400 or
B 134 Alloy C23000
4. Disc Hanger
Bronze ASTM B 61 or
MPIF SS-316NI-25
5. Seat Disc
Bronze ASTM B 61 C92200
Steam (PTFE) (Y)
6. Hanger Nut Bronze ASTM B16
7. Hinge Pin Plug Bronze ASTM B 140 Alloy C31400 (not shown)
8. Disc Holder Bronze ASTM B 61
9. Disc Nut Bronze ASTM B 62 or B 16
*10. Seat Disc Washer ASTM B 98 Alloy C65500 (not shown)
or ASTM B 103 (not shown)
*Sizes ³⁄₄", 1", 1¹⁄₄", 1¹⁄₂
" and 2" only.
DIMENSIONS—WEIGHTS—QUANTITIES
Dimensions
Size A B Weight Master
In. mm. In. mm. In. mm. Lbs. Kg. Ctn. Qty.
¹⁄₄ 8 2.25 57 1.56 40 0.57 0.26 50
³⁄₈ 10 2.25 57 1.56 40 0.57 0.26 50
¹⁄₂ 15 2.63 67 1.75 44 0.69 0.31 50
³⁄₄ 20 3.13 79 2.06 52 1.02 0.46 25
1 25 3.75 95 2.44 62 1.65 0.75 30
1 ¹⁄₄ 32 4.38 111 3.13 79 2.98 1.35 10
1 ¹⁄₂ 40 4.94 125 3.75 95 4.81 2.18 10
2 50 5.81 148 4.50 114 8.13 3.69 5
Ordering: T-473 is normally furnished with Bronze Disc (T-473-B).
Available with PTFE Steam Disc (T-473-Y).
Dezincification
Resistant
Install 5 pipe diameters minimum downstream from pump discharge or changes in direction to avoid flow
turbulence. Flow straighteners may be required in extreme cases.
Note: On pump discharge, the preferred check valves are:
- inline, spring assisted, center-guided, lift checks.
NIBCO
®
Check Valves may be installed in both horizontal and vertical lines with upward flow or in any
intermediate position. They will operate satisfactorily in a declining plane (no more than 15º).
Warning – Do Not Use For Reciprocating Air Compressor Service.
t For detailed Operating Pressure, refer to Pressure Temperature Chart on page 114.
WARNING: This product can expose you to chemicals including lead, which is known to the
State of California to cause cancer and birth defects or other reproductive harm. For more
information go to www.P65Warnings.ca.gov.