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Nil-Cor® Ball Check Valves (300X, 310, 500XP, 610XP Series)

Nil-Cor® Ball Check Valves, Fiberglass or Graphite Reinforcement Valves (300, 310, 500XP, 610XP Series) are made from fiber-reinforced Thermoset Resins for corrosive chemical service used in construction of pressurized piping systems.


Size Range: 1”-6” Flanged
Flange Drilling: ANSI CL 150
Body Types: One-Piece
Body Material: 300 Graphite/Vinyl ester, 310 Glass/Vinyl ester, 410 Glass/Polysulfone, 500XP Graphite/Epoxy, 610XP Glass/Epoxy
Ball Materials: PTFE, Polypropylene
Seat Materials: FKM Fluoroelastomer
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Product Features & Benefits

  • ONE-PIECE BODY: The one-piece body eliminates the leak path inherent in a body joint.
  • STRENGTH EQUIVALENT TO METALS: Nil-Cor® ball check valves are designed to achieve strengths equivalent to metals with the inherent corrosion resistance of advanced polymer matrix composite materials.
  • RUGGED AND DURABLE: For additional ruggedness and durability, the composite check valve has a body designed with heavier wall and flange thickness than metal.
  • STRONG, DURABLE AND LIGHT WEIGHT: Excellent alternative to high alloy valves. Nil-Cor ball check valves are 50% - 80% lower cost and 1/3 the weight. Saves money on piping supports and makes Nil-Cor ball check valves ideal for use on plastic and FRP flanged piping systems.
  • CORROSION RESISTANT, SAFE AND RELIABLE: All Nil-Cor ball valves feature lightweight, corrosion resistant bodies, no wetted metallic components and a lock-out as standard equipment.
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Technical Details


  • 300: Vinyl ester resin, graphite fiber reinforced
  • 310: Vinyl ester resin, glass fiber reinforced
  • 500XP: Novolac Epoxy resin, graphite fiber reinforced
  • 610XP: Novolac Epoxy resin, glass fiber reinforced

Construction (300, 310, 500XP, 610XP Series):

  • Body: Compression molded fiber-reinforced Thermoset Resins with integrally molded ball guides
  • Ball: Solid Virgin PTFE. Other materials available
  • Seat: PTFE-coated Viton
  • Body O-Ring: PTFE-coated Viton
  • 5 Body Insert: Compression molded fiber-reinforced Thermoset Resin

Size Range

  • Available size range:1”-6” 

Service Temperature

  • (-)50°F to 275°F
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Pressure Rating


  • Oil Refinery
  • Power Industry
  • Paper and Pulp
  • Chemical
  • Mining
  • Water and Wastewater
  • Hydrogen
  • Natural Gas Distribution
  • Lithium
  • Steel Processing
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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.

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