Buying Guide
71
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
Visit www.nibco.com for current Chem-Guide and galvanic potential in piping systems information.
www.nibco.com
AHEAD OF THE FLOW
®
Revised 7/20/2018
*Weighted average lead content ≤ 0.25%
Revised 11/15/2017
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.
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 Alloy C87600
3. Torsion Spring Stainless Steel ASTM A313 UNS S31600
4. Disc Hinge Pin Stainless Steel ASTM A276 UNS S31600
5. Disc Stop Pin Stainless Steel ASTM A276 UNS S31600
6. Disc Thrust Bearing Stainless Steel ASTM A240 UNS S31600
7. Hinge Pin Retainer Steel
8. Stop Pin Retainer Steel
9. Stabilization Sphere Buna-N
10. Spacer Stainless Steel ASTM A276 UNS S31600
Sizes 10" and 12" furnished with lifting eyebolt
Lead-Free
*
250 PSI CWP Iron Body Grooved Silent Check Valves
Twin Disc • Grooved Style • Bronze Disc • Buna-N Seat • Spring Actuated
250 PSI/17.2 bar non-shock cold working pressure
Maximum temperature to 180°F/82°C at 220 PSI/15 bar
CERTIFIED LEAD-FREE* BY WQA TO NSF/ANSI 372
CONFORMS TO ANSI/AWWA C606 FOR STEEL IPS PIPE
G-920-W-LF
Grooved
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. This valve is not to be used as a steam valve.
2. Valves are not to be used near a reciprocating air compressor.
3. Install 5 pipe diameters minimum downstream from pump discharge or elbows 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
- 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.
DIMENSIONS—WEIGHTS
Dimensions
Size A B C D Weight
In. mm. In. mm. In. mm. In. mm. In. mm. Lbs. Kg.
2 50 4.66 111 4.13 105 2.38 60 2.00 51 3.30 1.49
2½ 65 4.91 125 4.88 124 2.88 73 2.41 61 4.50 2.04
3 80 5.31 135 5.38 137 3.50 89 2.94 75 7.30 3.31
4 100 5.38 137 6.00 152 4.50 114 3.91 99 8.60 3.90
5 125 5.72 145 7.06 179 5.56 141 4.89 124 13.00 5.90
6 150 6.00 152 8.13 206 6.63 168 5.92 150 18.00 8.17
8 200 6.72 171 10.03 255 8.63 219 7.91 201 30.00 13.6
10 250 7.78 198 12.38 314 10.75 273 10.00 254 56.00 25.4
12 300 8.19 208 14.38 365 12.75 324 11.94 303 81.80 36.7
Groove dimensions conform to ANSI/AWWA specification C606 Table 4
(Cut Groove Dimensions)
COMPONENT
LEAD-FREE