Buying Guide
65
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 4/20/2020
MATERIAL LIST
PART SPECIFICATION
1. Body Bolt Steel ASTM A307/SAE J429
2. Identification Plate Aluminum
3. Bonnet Cast Iron ASTM A126 Class B
4. Body Gasket Reinforced Graphite
5. Body Nut Steel ASTM A563
6. Side Plug Brass ASTM B16 Alloy C36000
7. Hanger Pin Copper Alloy ASTM B16 Alloy C36000
8. Hanger Copper Alloy ASTM B584 Alloy C84400
9. Disc Nut Copper Alloy ASTM B584 Alloy C84400
10. Disc Copper Alloy ASTM B584 Alloy C84400
11. Seat Ring Copper Alloy ASTM B584 Alloy C84400
12. Body Cast Iron ASTM A126 Class B
NOTE: NIBCO may substitute Ductile Iron ASTM A395 (60-40-18) for ASTM A126 Class
B Cast Iron for the Body, Bonnet, Wedge, or Disc. NIBCO may substitute Ductile
Iron ASTM A395 (60-40-18) or ASTM A536 (65-45-12) for all other ASTM A126
Class B Cast Iron components.
Class 250 Iron Body Check Valves
Bolted Bonnet • Horizontal Swing • Renewable Bronze Seat and Disc*
500 PSI/34.5 bar non-shock cold working pressure to -20°F to 150°F/-29°C to 66°C
t
Maximum working temperature 450°F/232°C at 250 PSI/17.2 bar
250 PSI/17.2 bar saturated steam to 406°F/208°C
CONFORMS TO MSS SP-71 TYPE 1 • APPROVED BY
THE NEW YORK CITY B.S.A. 143-69-SA AT 350 PSI
NON-SHOCK COLD WATER
F-968-B
Flanged
F-968-B
Flg x Flg
DIMENSIONS—WEIGHTS—QUANTITIES
Dimensions
Size A B D E Weight
In. mm. In. mm. In. mm. In. mm. In. mm. Lbs. Kg.
2¹⁄₂ 65 11.50 292 5.83 149 7.50 191 1.00 25 62 28
3 80 12.50 318 6.31 160 8.25 210 1.13 29 77 35
4 100 14.00 356 7.56 192 10.00 254 1.25 32 129 58
6 150 17.50 445 8.50 216 12.50 318 1.44 37 225 102
*Proper machining facilities required.
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.
NIBCO Iron Body Check Valves may be installed in both horizontal and vertical lines with
upward flow or in any intermediate position.
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.