Nibco U51BC-V Ball Check Valve...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$258.39
Nibco U51BC-V Ball Check Valve - True Union, Corzan® CPVC Schedule 80, Universal Ends, FKM

Nibco U51BC-V Ball Check Valve - True Union, Corzan® CPVC Schedule 80, Universal Ends, FKM

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Model: MB801UA

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

$258.39
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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 universal socket and threaded 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
  • Includes both socket and female NPT thread 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

Product Specs

All Application(s):
Lead-Free
All Basic Material:
CPVC - Chlorinated Polyvinyl Chloride
Classification:
CPVC Sch 80 Ball-Check Valves
End Connection:
Threaded
Pipe Schedule:
80
Plastic End Connection Type:
Universal (S & F)
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

Nibco MB801UA – Frequently Asked Questions

1) Can I service a Nibco U51BC-V ball check valve without cutting it out of the CPVC line?
No cutting needed. The U51BC-V uses the Chemtrol true union design, so backing off the two union nuts lets you lift the valve body and internals out of the piping for repair or replacement, then drop it back in. That is the practical reason to spend on a true union check instead of a solvent-welded one on a line you expect to open again, such as a pump discharge or a chemical feed skid you have to service in place.
2) Does the Nibco U51BC-V come with socket ends or NPT threaded ends?
Both ship in the box. The U51BC-V has universal end connections (S and F), meaning each valve includes socket end connectors for solvent cementing and female NPT threaded connectors. You pick at install, so one part number covers a solvent-welded run and a threaded transition to a pump or meter without ordering two SKUs.
3) What pipe sizes does the Nibco U51BC-V true union ball check valve come in?
Six sizes, all Schedule 80 CPVC: 1/2, 3/4, 1, 1-1/4, 1-1/2 and 2 inch. Order by size code, for example MB801U6 is the 1/2 inch and MB801UD is the 2 inch. There is nothing above 2 inch in this model, so a 3 or 4 inch header needs a different Chemtrol check valve.
4) What pressure and temperature can a Corzan CPVC ball check valve handle?
150 psi at 73 F with water, non-shock, and a maximum service temperature of 210 F. Note how those two relate: thermoplastic valves de-rate as temperature climbs, so the full 150 psi is a 73 F number, not a 210 F number. For hot process water or a warm chemical loop, check the Chemtrol pressure/temperature de-rating data for your actual operating temperature before you size the line.
5) Can I use a CPVC ball check valve on a compressed air line?
No. The U51BC-V is a liquid service valve, and Chemtrol states plainly it must not be used or tested with compressed air or other gases. That includes pressure testing: hydrostatic test only. Air testing a thermoplastic system stores energy in the line and the failure mode is not a leak, it is a burst. If your service is air or gas, this valve is the wrong part.
6) Is the Nibco U51BC-V CPVC check valve approved for potable water?
The U51BC-V carries NSF/ANSI Standard 14 and NSF/ANSI/CAN 61, and is flagged lead-free, which is the combination a potable water system needs on a plastic valve. It also meets ASTM F1970, the standard for molded plastic valves in water distribution. That set of listings is what an institutional or municipal spec reviewer is looking for on a domestic water line.
7) Will an FKM seal check valve hold up to my chemical, or do I need EPDM?
The U51BC-V uses FKM fluoroelastomer for the seat seal and O-ring. FKM is the seal you want for aggressive oxidizers, acids and most hydrocarbons. Where it is the wrong choice is hot water above roughly 180 F, ketones, amines and some caustics, and those are the services that normally push you to an EPDM sealed version of the same valve. Match the elastomer to the fluid, not the pipe.
8) Does a ball check valve have to be installed a certain way up?
Yes, orientation matters on a ball check. The ball seats by gravity and flow, so these are installed with the flow arrow on the body pointed in the direction of flow, and on vertical runs only with upward flow so the ball falls back onto the seat when flow stops. Mount one upside down on a vertical drop and the ball never reseats. A ball check also needs a reasonable length of straight pipe ahead of it, not a fitting right at the inlet.
9) Can I thread a CPVC true union check valve straight onto a metal pump nipple?
You can, using the female NPT connector that comes with the valve, but do the transition carefully. Thread the plastic female end onto the metal male thread, never the reverse, use PTFE tape or a plastic-safe thread sealant, and hand tighten plus one to two turns. Overtightening a Schedule 80 CPVC threaded joint splits it, and thread sealants with petroleum or POE oil content attack CPVC. Where the joint sees vibration from a pump, a solvent-welded socket connection with a flexible connector upstream is the more durable arrangement.
10) Why pick CPVC over PVC or a bronze check valve for an industrial water line?
Corzan CPVC holds mechanical strength across a wider temperature band than standard PVC, which is why it goes to 210 F service where Schedule 80 PVC tops out well below that. Against bronze or iron, CPVC will not rust, scale, pit or corrode, and it is light enough to hang and handle without rigging. The trade is that it is a liquid-only, non-shock valve with no air or gas service, and it de-rates with heat, where metal does not. Typical use is commercial plumbing, industrial process, and irrigation.
11) Is there anything that will damage a CPVC valve that I should keep off the job?
Yes, and it is the most common field failure on CPVC. Polyol ester (POE) and other oils, some thread sealants, cutting fluids, spray leak detectors, adhesives, tapes and insulation can chemically attack CPVC and crack it under stress, sometimes weeks after the install looks fine. Nibco publishes a plastics incompatibility warning covering this. Use only sealants and ancillary materials the manufacturer confirms are CPVC compatible, and keep refrigeration oils away from the pipe entirely.
12) Will the Nibco U51BC-V match the grey CPVC valves already on my system?
The U51BC-V body is light grey, the standard Corzan CPVC color, so it reads the same as the rest of a Chemtrol CPVC valve train. Worth knowing for a facility standardizing on one look and one spare parts shelf: buying the same series across sizes 1/2 through 2 inch means the union nuts, seals and service procedure are consistent for your maintenance crew.
How fast can I get the Nibco MB801UA 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 MB801UA come with a warranty?
Absolutely. The Nibco MB801UA 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 MB801UA?
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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