Nibco S51BC-V Ball Check Valve...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$1,612.37
Nibco S51BC-V Ball Check Valve - Socket, True Union, Corzan® CPVC Schedule 80, FKM Seat

Nibco S51BC-V Ball Check Valve - Socket, True Union, Corzan® CPVC Schedule 80, FKM Seat

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Model: MB801AF

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

$1,612.37
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The original Chemtrol® True Union design allows the valve and operational components to be conveniently lifted from the piping system for repair or replacement. The valve can be easily joined with the socket end connections. Please refer to Chemtrol technical data sheets, valve selection guides and catalogs for engineering and installation information. Corzan® CPVC Schedule 80 thermoplastics demonstrate excellent mechanical strength over broad temperature range, outstanding underground performance and superior hydraulics. Chemtrol Corzan® CPVC valves are lightweight, easy to install, maintenance-free and will not rust, scale, pit or corrode. Choose Chemtrol® valves for the most reliable, versatile and economical valve option in commercial and industrial applications. Chemtrol® ball check valves are backed by a 1-year limited warranty. Because Chemtrol® is a NIBCO brand the flow-control valves are unsurpassed in quality, performance and longevity.

  • Valve pressure rating 150 psi at 73-DegreeF water non-shock
  • Maximum service temperature 210-DegreeF
  • True Union design
  • FKM O-ring
  • Socket end connections
  • Do not use or test with compressed air or other gases
  • ASTM F1970
  • NSF/ANSI Standard 14
  • NSF/ANSI/CAN-61

POE Warning - Plastics Incompatibility

Manufacturer Resources

Spec Sheet

Product Specs

All Application(s):
Lead-Free
All Basic Material:
CPVC - Chlorinated Polyvinyl Chloride
Classification:
CPVC Sch 80 Ball-Check Valves
End Connection:
Solvent Weld
Pipe Schedule:
80
Plastic End Connection Type:
S Socket
Product Group:
Valve
Seat Seal Material:
FKM Fluoroelastomer
System Use:
Commercial Plumbing, Industrial, Irrigation, Lead Free*
Type of Check Valve:
Ball-Check
Type of Valve:
Check Valve
Product Subgroup:
Unions
Product Type:
CPVC Sch 80 Ball-Check Valves
Department:
Plumbing
Product Color:
Light Grey
Product Height:
7.17 in
Product Width:
7.17 in
Country Of Origin:
United States

Nibco MB801AF – Frequently Asked Questions

1) What pipe sizes does the Nibco S51BC-V CPVC ball check valve come in?
The S51BC-V true union ball check valve is offered in 3 inch and 4 inch. The 3 inch is MPN MB801AF and the 4 inch is MB801AH. Both are Schedule 80 CPVC with socket (solvent weld) ends, so they solvent-cement onto Sch 80 CPVC pipe of the matching size.
2) Can I use this CPVC check valve on a compressed air line?
No. The Chemtrol S51BC-V is a liquid service valve only, and the instructions are explicit: do not use or test it with compressed air or other gases. If your line is air or gas, use a metal valve rated for that service instead.
3) What pressure and temperature can the Nibco S51BC-V ball check valve handle?
Rated 150 psi at 73 F on water, non-shock, with a maximum service temperature of 210 F. The 210 F ceiling is the reason to pick CPVC over PVC here; the pressure rating de-rates as the fluid temperature climbs toward that maximum, so size the system on the actual operating temperature.
4) Do I have to cut the pipe to service a Chemtrol true union check valve?
No. The true union design lets you back off both union nuts and lift the valve body and internal ball out of the line for cleaning or replacement, leaving the socket-cemented end connectors bonded to the pipe. That is the main reason to specify the true union version over a solvent-in-line check.
5) Is this CPVC check valve approved for potable water?
Yes. The valve is certified to NSF/ANSI Standard 14 and NSF/ANSI/CAN 61, and it also meets ASTM F1970. It is listed as a lead-free application, which is what a spec for potable commercial plumbing usually calls for.
6) Is the FKM seat the right choice, or should I get EPDM?
The S51BC-V carries an FKM (fluoroelastomer) seat and O-ring. FKM is the seal to specify for aggressive chemical and oxidizer service where EPDM would swell or degrade. EPDM is generally the pick for hot water and some water treatment chemicals. Match the elastomer to the fluid you are pumping, not to the pipe material.
7) Does a ball check valve have to be installed a certain way up?
Yes, orientation matters. A ball check relies on the ball unseating with flow and returning to the seat by gravity and backpressure, so install it with the flow arrow on the body pointing downstream and, in vertical runs, with flow going up. Mounting it upside down or backward will keep it from sealing.
8) Where does a Corzan CPVC check valve make sense instead of a metal one?
Commercial plumbing, industrial process, and irrigation lines are the stated uses. CPVC will not rust, scale, pit or corrode, and it is light enough to hang on standard supports without the weight of bronze or iron. The trade-off is the 210 F ceiling and no air or gas service.
9) What color is the Chemtrol CPVC valve body, and does it match my CPVC piping?
The body is light grey, which is the usual Corzan CPVC industrial color and matches standard grey Sch 80 CPVC pipe and fittings on the run.
How fast can I get the Nibco MB801AF 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 MB801AF come with a warranty?
Absolutely. The Nibco MB801AF 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 MB801AF?
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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