Your browser is out of date.

You are currently using Internet Explorer 7/8/9, which is not supported by our site. For the best experience, please use one of the latest browsers.

manufactured in the usa

Nil-Cor® Double-Offset Disc Composite Butterfly Valve, Sizes (Series 310HD) Fiberglass Reinforced Vinyl Ester

Nil-Cor® Double-Offset Disc Butterfly Valve, Sizes 14”-48” (Series 310HD) Fiberglass Reinforced Vinyl Ester, is a double-offset wafer style high performance composite butterfly valve with corrosive chemical service used in construction of pressurized piping systems. 

Request a Quote Technical Support

Product Features & Benefits

  • COMPOSITE ADVANTAGE: Nil-Cor® uses premium epoxy novolac vinyl ester resin and a special blend of fillers, reinforcement and curing agents to produce an inherently corrosion resistant valve. Without the need for expensive liners that eventually swell or permeate, Nil-Cor® butterfly valves deliver a long, maintenance-free service life.
  • DOUBLE-OFFSET DISC DESIGN: allows the disc to move off the seat with a “camming” action, reducing break-away torque and seat wear.
  • 360° UNINTERRUPTED DISC SEAL: eliminates the leak path at the shaft hubs found on PTFE and rubber-lined valves.
  • STAINLESS-STEEL SHAFT: the stainless-steel shaft encapsulated with graphite or fiberglass-reinforced vinyl ester resin eliminates corrosion and assures long trouble-free operation.
  • CHEMICAL RESISTANCE TO CORROSIVE SOLUTIONS: the novolac epoxy resin and graphic fiber combination valve provides outstanding resistance to solvents organic acids, caustics and salt solutions in higher temperature applications.
  • DURABLE AND LIGHT WEIGHT: Nil-Cor® butterfly valves weigh less than 1/3 that of similarly sized metal valves. This means reduced handling and shipping expenses and easier installation.
contact us

Technical Details

Materials of Construction

  • Gland Nut, Top 304 Stainless Steel
  • Gland Stud, Top 304 Stainless Steel
  • Gland, Top 316 Stainless Steel
  • Shaft 17-4PH SS/Vinyl Ester
  • Packing, Top Virgin PTFE V-Rings
  • Valve Body Fiberglass reinforced Vinyl Ester
  • Disc Spacer (2) Glass-reinforced PTFE
  • Disc Fiberglass reinforced Vinyl Ester
  • Seat Ring Viton GF or PTFE Envelope
  • Packing, Bottom Virgin PTFE V-Rings
  • Gland, Bottom 316 Stainless Steel
  • Gland Stud, Bottom 304 Stainless Steel
  • Gland Nut, Bottom 304 Stainless Steel
  • Nuts, Bottom Shield 18-8 Stainless Steel
  • Lock Washers 18-8 Stainless Steel
  • Hex Head Cap Screws 18-8 Stainless Steel
  • Bottom Shield Epoxy-coated Carbon Steel

Size Range

  • 14” – 48” 

Flange Compatibility

  • ANSI CL150 AND CL125
  • DIN and JIS on application

Service Temperature

  • Continuous temperature service from -50 to 250° F. Short-term exposures to 300° F are acceptable.
Request a Quote

Pressure Rating

Body Type

  • Full Faced Wafer
  • Threaded Lug


  • Oil Refinery
  • Power Industry
  • Paper and Pulp
  • Chemical
  • Mining
  • Water and Wastewater
  • Hydrogen
  • Natural Gas Distribution
  • Lithium
  • Steel Processing
technical support
need help choosing a material?

View Our Chemical Resistance Guide

This resource is intended as a guideline to be used with all available information to determine suitability of material selection. We suggest thorough research which should include known applications when determining material. The information contained herein is provided only as a guide for the use of ANDRONACO INDUSTRIES products.

view chemical guide
Download Our Product Catalog
explore our full offering

Download Our Product Catalog

Download Now

Contact Us

Give us a call at 616-554-4600 or fill out this form and one of our experts will be in touch as soon as possible.

* marks required fields

Technical Support Inquiry Request a Quote

Please Upload all supporting Files Here. The accepted file formats are jpg,jpeg,png,gif,pdf,doc,docx. Thank you.