Buying Guide

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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%
MATERIAL LIST
PART SPECIFICATION
1. Body
Ductile Iron ASTM A536 Grade 65-45-12
w/Buna-N (Nitrile) resilient seat molded to body
2. Disc Bronze ASTM B584 UNS C87600
3. Torsion Spring Stainless Steel ASTM A313 UNS S31600
4. Disc Thrust Bearing Stainless Steel ASTM A240 UNS S31600
5. Stabilization Sphere Buna-N
6. Hinge Pin Retainer Stainless Steel ASTM A276 UNS S31600
7. Stop Pin Retainer Stainless Steel ASTM A276 UNS S31600
8. Disc Hinge Pin Stainless Steel ASTM A276 UNS S31600
9. Spacer Stainless Steel ASTM A276 UNS S31600
10. Disc Stop 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
250 PSI/17.2 bar non-shock cold working pressure
Maximum temperature to 180°F/82°C
CERTIFIED LEAD-FREE* BY WQA TO NSF/ANSI 372 •
NSF/ANSI 61 CERTIFIED BY UL •
CONFORMS TO AWWA C518
W-920-W-LF
Wafer
DIMENSIONS—WEIGHTS
Dimensions
Size A B C D E Weight
In. mm. In. mm. In. mm. In. mm. In. mm. In. mm. Lbs. Kg.
2 50 2.13 54 5.13 130 — — 2.88 73 — — 4 2
2¹⁄₂ 65 2.38 60 6.00 152 .13 3.3 3.50 89 1.31 33 5 2
3 80 2.63 67 5.63 143 .19 4.8 3.88 99 1.69 43 7 3
4 100 2.63 67 7.75 197 .63 16.0 4.75 121 3.06 78 9 4
5 125 3.25 83 7.56 192 .81 20.0 5.50 140 3.63 92 13 6
6 150 3.75 95 8.63 222 .81 32.0 6.25 171 4.25 146 19 9
8 200 5.00 127 12.25 279 1.00 33.0 8.00 222 5.50 197 37 17
10 250 5.50 140 14.75 340 2.06 64.0 10.25 276 8.50 248 65 30
12 300 7.13 181 17.38 410 1.94 60.0 12.00 327 9.25 279 94 43
2" thru 12"
NOTE: Twin Disc Check Valves can be installed horizontally or in the vertical position with flow up.
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.
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
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.