Nibco SI-3 Check Valve - Brass...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$64.31
Nibco SI-3 Check Valve - Brass, Swing, Solder

Nibco SI-3 Check Valve - Brass, Swing, Solder

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Model: N00326A

In Stock (leaves warehouse same day if ordered before 3pm ET)

$64.31
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The NIBCO® brass swing checks may be installed in horizontal positions (or vertical with flow moving up). Please refer to NIBCO technical data sheets, chemical resistance guides and catalogs for engineering and installation information. Choose NIBCO® check valves for the most specified, versatile and economical valve option in commercial and residential applications. The NIBCO® check valve is backed by the NIBCO 2-year limited warranty.

  • Valve pressure rating 200 psi/14 bar non-shock cold working pressure
  • Brass disc
  • Brass bonnet
  • Solder end connections
  • Use in U.S. drinking water applications is prohibited after January 3, 2014

Manufacturer Resources

Spec Sheet

Product Specs

All Basic Material:
Brass
Classification:
Brass Check Valves
End Connection:
Solder
Product Group:
Valve
Seat Seal Material:
Brass
System Use:
Residential Plumbing
Type of Check Valve:
Swing
Type of Valve:
Check Valve
Valve End Connection Type:
S -- Female Solder Cup
Valve Multi Turn Bonnet Design:
Screw-in Bonnet
Valve Pressure Rating (CWP):
200 PSI / 13.8 Bar CWP
Valve Trim Package:
Brass Disc
Product Subgroup:
Valves
Product Type:
Brass Check Valves
Department:
Plumbing

Nibco N00326A – Frequently Asked Questions

1) Can the Nibco SI-3 brass swing check valve be installed vertically?
Only in a vertical run where flow is moving up. The SI-3 swing check is built for horizontal installation or vertical-up flow; a swing disc relies on gravity and flow to seat, so flow-down piping will not hold it closed. Plan the orientation before you sweat the joints.
2) What pipe sizes does the Nibco SI-3 solder check valve come in?
Three sizes: 1 inch (N00326A), 1-1/4 inch (N00326B), and 2 inch (N00326D). All are female solder cup ends, so they sweat directly onto Type L or M copper tube of the matching nominal size.
3) Can I use the Nibco SI-3 check valve on a potable water line?
No. Use of the SI-3 in U.S. drinking water applications is prohibited after January 3, 2014. It is a brass swing check for non-potable service such as hydronic heating loops and similar closed systems. For domestic water you need a lead-free rated check valve.
4) Does the SI-3 have threaded ends or solder ends?
Solder only. The end connection is a female solder cup, so it sweats onto copper tube. If the existing piping is threaded iron or you need a union connection, this is the wrong valve body style for that opening.
5) What pressure will the SI-3 brass swing check handle?
200 PSI / 13.8 bar non-shock cold working pressure. That covers typical residential and light commercial water and hydronic pressures with margin, but it is a cold working rating, so do not apply it to steam service.
6) Is the Nibco SI-3 check valve serviceable, or do I have to cut it out if the disc fails?
It uses a screw-in bonnet, so the bonnet can be backed out to reach the disc without disturbing the soldered joints. Disc, bonnet, and seat are all brass.
7) Swing check or spring check for a pump discharge line?
The SI-3 is a swing check, which means low pressure drop and free flow in the open position, but it needs horizontal piping or upward vertical flow to work. A spring-loaded check is what you want if the line runs vertically downward or if you need the valve to close fast to limit water hammer. For a straight horizontal pump discharge, the swing design is the lower-restriction option.
8) Will soldering damage the check valve's internals?
The disc, bonnet, and seat are brass, not soft elastomer, so the assembly tolerates sweating better than a rubber-seated valve. Standard practice still applies: keep the flame on the fitting cup, not the bonnet, and if you are working the 2 inch size where more heat is needed, back the bonnet out first.
How fast can I get the Nibco N00326A delivered?
Most orders ship the same day from our distribution partners, with quick delivery throughout the continental U.S. Need it urgently? Contact Us for expedited shipping options.
Can I return it if it doesn’t work for me?
Yes—ZenSupply offers a hassle-free return policy. If the product isn’t the right fit, reach out to our support team for a return authorization or setup a return by following our return instructions.
Does the Nibco N00326A come with a warranty?
Absolutely. The Nibco N00326A is backed by a manufacturer’s warranty. For full warranty terms, check the product documentation or Contact Us.
How do I get technical support or installation help for the Nibco N00326A?
You can call, text, or email our expert support team for fast answers. We’re here to help with product selection, installation tips, and troubleshooting. Contact Us
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