Buying Guide

69
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
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Visit www.nibco.com for current Chem-Guide and galvanic potential in piping systems information.
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AHEAD OF THE FLOW
®
Revised 7/20/2018
*Weighted average lead content ≤ 0.25%
DIMENSIONS—WEIGHTS
Dimensions
Size A B C D E Weight
In. mm. In. mm. In. mm. In. mm. In. mm. In. mm. Lbs. Kg.
14 350 7.25 184 17.75 451 3.25 83 14.38 365 12.50 318 187 85
16 400 7.50 191 20.25 514 4.50 114 16.38 416 15.00 381 270 122
18 450 8.00 203 21.63 549 5.38 137 18.38 467 17.00 432 350 150
20 500 8.38 213 23.88 606 6.38 162 20.25 514 19.00 483 424 192
24 600 8.75 222 28.25 718 8.50 216 24.25 616 23.00 584 589 267
NOTE: Twin Disc Check Valves can be installed horizontally or in the vertical position with flow up.
MATERIAL LIST — 14" thru 24"
PART SPECIFICATION
1. Body
Cast Iron ASTM A126 Class B w/Buna-N
(Nitrile) resilient seat molded to body
2. Disc Aluminum Bronze ASTM B148 C95200
3. Torsion Spring
Stainless Steel ASTM A313 UNS S31600
or UNS S17700
4. Disc Thrust Bearing Stainless Steel ASTM A240 UNS S31600
5. Stabilization Sphere Buna-N
6. Hinge Pin Retainer Steel
7. Stop Pin Retainer Steel
8. Disc Stop Pin Stainless Steel ASTM A276 UNS S31600
9. Disc Hing Pin Stainless Steel ASTM A276 UNS S31600
Lead-Free
*
Class 125 Iron Body Check Valves
Twin Disc • Wafer Style • Bronze disc • Rubber seat • Spring Actuated
150 PSI/10.3 bar non-shock cold working pressure
Maximum temperature to 180°F/82°C
W-920-W-LF
Wafer
CAUTION: For horizontal flow applications, the valve must be installed with disc hinge pin in the vertical position, to
insure proper operation.
WARNING: 1. Seat end of valve must be mated to a standard flat faced metal flange. Rubber flanges not acceptable.
2. These are not to be used as steam valves.
3. Valves are not to be used near a reciprocating air compressor.
4. Install 5 pipe diameters minimum downstream from pump discharge or elbows to avoid flow turbu-
lence. Flow straighteners may be required in extreme cases.
Note: On pump discharge, the preferred check valves are:
- inline, spring assisted, center-guided, lift checks
- spring assisted twin (double) disc
- swing design with lever and weight or lever and spring
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.
COMPONENT
LEAD-FREE
FLOW
CERTIFIED LEAD-FREE* BY WQA TO NSF/ANSI 372 •
NSF/ANSI 61 CERTIFIED BY UL •
CONFORMS TO AWWA C518
WATER QUALITY
NSF 61 CERTIFIED
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.