Nibco G-920-W-LF Check Valve -...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$5,766.83
Nibco G-920-W-LF Check Valve - Lead-Free*, Cast Iron, Silent, Grooved

Nibco G-920-W-LF Check Valve - Lead-Free*, Cast Iron, Silent, Grooved

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Model: NLN52XM

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

$5,766.83
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The check valve includes renewable bronze discs. Grooved silent check valves 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, mechanical and industrial applications. NIBCO® check valves are backed by the NIBCO 5-year 125% limited warranty.

  • Valve pressure rating 250 psi/17.2 bar non-shock cold working pressure
  • Maximum temperature 180-DegreeF/ 82-DegreeC
  • Spring actuated
  • Renewable bronze discs
  • Buna-N seat
  • Grooved end connections
  • Lead-free*
  • Conforms to ANSI/AWWA C606 for steel IPS pipe
  • NSF/ANSI/CAN-61 and 372

Twin Disc Check Valves KW900WLF-W920WLF IOM Manual

Manufacturer Resources

Product Specs

All Application(s):
Lead-Free
All Basic Material:
Cast Iron
Classification:
Inline Lead-Free
End Connection:
Grooved
Product Group:
Valve
Seat Seal Material:
Buna-N Nitrile Rubber
System Use:
Lead Free*
Type of Check Valve:
Inline;Twin Disc
Type of Valve:
Check Valve
Valve End Connection Type:
G - Grooved
Valve Pressure Rating (CWP):
250 PSI / 17.2 Bar CWP
Product Subgroup:
Valves
Product Type:
Inline Lead-Free
Department:
Plumbing

Nibco NLN52XM – Frequently Asked Questions

1) Can the Nibco G-920-W-LF grooved check valve be installed vertically?
Yes, but only with flow moving up. The G-920-W-LF silent check valve is approved for horizontal installation or vertical installation with upward flow. It's spring actuated, so gravity isn't what closes it, but the mounting orientation still has to follow those two positions. Downward vertical flow is not an approved position.
2) What is the pressure and temperature limit on the Nibco G-920-W-LF?
250 psi (17.2 bar) non-shock cold working pressure, with a maximum temperature of 180 F (82 C). The 180 F ceiling comes from the Buna-N seat, so this one suits domestic water and standard hydronic service, not high temperature steam or hot water above that limit.
3) Will a silent twin disc check valve stop water hammer better than a swing check?
That's the point of this design. The G-920-W-LF is a spring actuated twin disc check, so the discs close as flow decays rather than slamming shut after reverse flow starts. That's what keeps pump discharge and riser piping quiet. A swing check has no spring and relies on backflow to shut it, which is where the hammer comes from.
4) What size Nibco G-920-W-LF do I order for a 4 inch grooved riser, and what's the part number?
The 4 inch is MPN NLN52XH. Full size range and numbers: 2 inch NLN52XD, 2-1/2 inch NLN52XE, 3 inch NLN52XF, 4 inch NLN52XH, 5 inch NLN52XJ, 6 inch NLN52XK, 8 inch NLN52XL, 10 inch NLN52XM, 12 inch NLN52XN. Size is the only option to pick, everything else on the valve is the same across the range.
5) Is the Nibco G-920-W-LF a wafer style valve that mounts between flanges?
No. This is a grooved end valve, not a wafer. It joins with grooved couplings to C606 grooved steel pipe. If your piping is flanged, a grooved valve won't drop in without grooved adapter flanges or a different valve body style.
6) Can the discs be replaced without pulling the valve out of the line?
The discs are renewable bronze, so they are a serviceable wear item rather than a throwaway. Nibco publishes the Twin Disc Check Valves KW900WLF-W920WLF IOM manual covering service on this family, and that's what you follow for disc and spring replacement procedure.
How fast can I get the Nibco NLN52XM 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 NLN52XM come with a warranty?
Absolutely. The Nibco NLN52XM 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 NLN52XM?
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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