BNL’s 3-piece design In-Line Check Valve offers the best combination of benefits for critical service in nuclear power plants. Available in commercial grade, ASME B31.1, ASME B16.34, or with ASME Section III N-Stamp; the valve design can be configured for special processes when required. The In-Line Check Valve provides the user a simple, reliable answer for difficult applications.

The In-Line Check Valve conforms to the axial flow model, utilizing a light spring to assist valve closure, avoiding the potential for water hammer. The internal dynamics of this style valve involve a minimum mass movement, resulting in less wear and longer life for valve internals than swing and lift check designs. The In-Line Check Valve offers the versatility of metallic or non-metallic seating, providing for tight shutoff in all applications.

Tight Shutoff - Even at low differential pressures (dP). Valves are tested and inspected for bubble tight seal prior to shipment

Easy Servicing - The removable center section and four internal parts ensure quick access and minimal maintenance.

No Slam Design - The axial flow design ensures closure prior to flow reversal, avoiding check valve slam and water hammer.

Self-Flushing - The In-Line Check Valve is self-flushing and will not “gum up” and hang open, a common problem with piston checks.

Reliability - There are no worn or broken hinge pins or misaligned discs, common causes of swing check valve failures.

SIZE: 1/2" - 6"

ENDS: Welded, FNPT, Flanged, Wafer, Union, Special

ANSI CLASS: 150 through 1700

MATERIAL: Stainless Steel, Carbon Steel, Al-Bronze, Duplex, Titanium, Alloy 20, Hastelloy, AL-6XN, Inconel, Monel, and other alloys

SPRING: Inconel 600, 17-7 Stainless Steel, Monel, Titanium


ASME B31.1, B31.3
ASME Section III, with or without N-Stamp (all code editions and addenda)
  • Service Water
  • Reactor Plant Fresh Water
  • Diesel Air
  • Reactor Water Cleanup
  • Radioactive Waste
  • Chiller Temperature Control
  • Containment Airlock
  • Vacuum Breaker
  • Chemical Injection Systems
Copyright 2012 - BNL Industries, Inc.
BNL Industries, Inc., 30 Industrial Park Road, Vernon, CT 06066 - ph: 860-870-6222  fx: 860-870-6221