Buying Guide

70
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
DIMENSIONS—WEIGHTS
Dimensions
Size A B C D E Weight
In. mm. In. mm. In. mm. In. mm. In. mm. In. mm. Lbs. Kg.
30 750 12.00 305 34.75 883 9.50 241 30.00 762 28.50 724 1112 504
36 900 14.50 368 41.25 1048 12.00 305 36.00 914 34.50 876 1864 846
NOTE: Twin Disc Check Valves can be installed horizontally or in the vertical position with flow up.
MATERIAL LIST — 30"
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 UNS C952000
3. Torsion Spring
Stainless Steel ASTM A 313 UNS S31600
or UNS S17700
4. Disc Thrust Bearing Stainless Steel ASTM A 240 UNS S31600
5. Stabilization Sphere Nitrile ASTM D 2000
6. Hinge Pin Retainer Steel
7. Stop Pin Retainer Steel
8. Disc Stop Pin Stainless Steel ASTM A 276 UNS S31600
9. Disc Hing Pin Stainless Steel ASTM A 276 UNS S31600
Class 125 Iron Body Check Valves
Twin Disc • Wafer Style • Bronze Disc • Rubber Seat •
Spring Actuated • Non-Slam • Silent Check
150 PSI/10.3 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
MATERIAL LIST — 36"
PART SPECIFICATION
1. Body Cast Iron ASTM A126 Class B
2. Disc Nickel Plated D.I. ASTM A536 Grade 65-45-12
3. Torsion Spring
Stainless Steel ASTM A 313 UNS S31600
or UNS S17700
4. Inner Thrust Bearing Stainless Steel ASTM A 240 UNS S31600
5. Outer Thrust Bearing Stainless Steel ASTM A 240 UNS S31600
6. Hinge Pin Retainer Steel
7. Stop Pin Retainer Steel
8. O-Ring Nitrile ASTM D 2000
9. Shaft Collar Stainless Steel ASTM A 240 UNS S31600
10. Stabilization Sphere Nitrile ASTM D 2000
11. Stop Pin Stainless Steel ASTM A 276 UNS S31600
12. Hinge Pin Stainless Steel ASTM A 276 UNS S31600
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.
FLOW
FLOW
*Weighted average lead content ≤ 0.25%
WARNING: This product can expose you to chemi-
cals 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.
COMPONENT LEAD-FREE
WATER QUALITY
NSF 61 CERTIFIED