Nibco W51BF-E-GO Butterfly Val...
IN STOCK (leaves warehouse same day if ordered before 3pm ET)
$277.16
Nibco W51BF-E-GO Butterfly Valve - Model B, Corzan® CPVC Schedule 80, EPDM

Nibco W51BF-E-GO Butterfly Valve - Model B, Corzan® CPVC Schedule 80, EPDM

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Model: MB386AF

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

$277.16
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The valve is easy to install but cannot be used as an isolation valve. 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® 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
  • Wafer style
  • EPDM O-rings and boot
  • Flanged end connections compatible with ANSI B16.5 Class 150
  • Bare stem or lever handle
  • 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 Butterfly Valves
End Connection:
Wafer
Pipe Schedule:
80
Product Group:
Valve
Seat Seal Material:
EPDM Rubber
System Use:
Commercial Plumbing, Industrial, Irrigation, Lead Free*
Type of Valve:
Butterfly Valve
Product Subgroup:
Valves
Product Type:
CPVC Sch 80 Butterfly Valves
Department:
Plumbing
Product Color:
Light Grey
Country Of Origin:
United States

Nibco MB386AF – Frequently Asked Questions

1) Can the Nibco Chemtrol W51BF butterfly valve be used as an isolation valve at the end of a line?
No. The W51BF-E-GO is not suitable for isolation service, per Nibco's own instruction. Use it for throttling and shutoff duty within a run, and pick a true isolation valve (a ball or gate type rated for dead-end service) where you need to isolate a branch for maintenance.
2) Will a CPVC wafer butterfly valve bolt up to my ANSI 150 flanges?
Yes. The W51BF is a wafer style valve with flanged end connections compatible with ANSI B16.5 Class 150, so it sandwiches between a matching pair of Class 150 flanges on your CPVC or metal piping. Because it is a wafer body, it is not designed to be bolted to only one flange.
3) What pressure and temperature can the Chemtrol Corzan CPVC butterfly valve handle?
Rated 150 psi at 73 F on water, non-shock, with a maximum service temperature of 210 F. Keep in mind that thermoplastic pressure ratings fall off as temperature climbs, so a line running near 210 F is a temperature-limit application, not a 150 psi one. Water service only: do not use or test the valve with compressed air or other gases.
4) Bare stem, lever-lock, or gear operator: which one do I order for a 3 inch CPVC butterfly valve?
All three are available in 3 inch. Bare stem (MB366AF) is for mounting an actuator or a remote operator and ships with no handle. Lever-lock (MB376AF) is the standard manual choice for quarter-turn operation where an operator can reach the valve. Gear operator (MB386AF) gives you a handwheel with mechanical advantage, which is what you want for frequent cycling, throttling at higher differential, or hard-to-reach mounting.
5) Is this CPVC butterfly valve approved for potable water?
Yes. The valve carries NSF/ANSI Standard 14 and NSF/ANSI/CAN 61 listings and also meets ASTM F1970, and it is designated lead-free. That combination is what specifying engineers and institutional buyers look for on potable commercial plumbing.
6) Is the EPDM seat in this Chemtrol valve the right choice for my chemical service?
The W51BF-E-GO uses EPDM rubber for the seat seal, with EPDM O-rings and boot. EPDM suits water, irrigation, and many dilute aqueous chemicals. Where your media calls for a different elastomer, order the Viton seated version of the valve instead. Also read Nibco's POE warning on plastics incompatibility before using the valve anywhere near refrigeration oils or similar media.
7) Can I pressure test this CPVC butterfly valve with air?
No. Nibco specifically states not to use or test the valve with compressed air or other gases. Hydrostatic test only. Air testing thermoplastic valves and piping is a safety hazard, and it voids the intended service of the valve.
8) Can I automate the Chemtrol W51BF with an electric or pneumatic actuator?
Yes, that is what the bare stem version is for. Order MB366AF, the 3 inch bare stem configuration, which comes without a handle so you can mount your own actuator or operator to the stem. If you want manual operation out of the box, order the lever-lock or gear operator version instead.
9) Will this Chemtrol valve match the grey CPVC piping already in my plant?
The body is light grey, which is the usual Corzan CPVC color, so it blends with existing Schedule 80 CPVC runs. Schedule 80 is the pipe schedule it is built to, and typical uses are commercial plumbing, industrial process, and irrigation.
How fast can I get the Nibco MB386AF 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 MB386AF come with a warranty?
Absolutely. The Nibco MB386AF 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 MB386AF?
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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