Spark Detection and Extinguishing Systems

KB Duct No-Return Explosion Isolation Valve

NRV Valve - Explosion Isolation

The "NRV" Explosion Isolation Valve is designed to protect your facilities and employees by preventing an explosive force from within a baghouse or filtration system from moving past the valve. Without an isolation valve, if a fire or explosion takes place, burning fuel and explosive force rapidly expands and can enter the building through the suction side duct system, causing severe injury and damage to property.


  • Low Total Cost of Ownership
  • High reliability – Our Explosion Isolation Valves are quality tested, ATEX , and NFPA 69-2014 (National Fire Protection Association) compliant
  • Maximum protection to protect your workers and facilities
  • Superior heavy duty welded steel construction


  • Options – Micro-switch shut down system, dust level sensor, and control panel for sensor power and integration
  • Fast-acting flap valve and locking mechanism
  • Inspection/access door

For more information on the KB Duct NRV Valve, just submit our contact form online or...

CALL TOLL FREE 1-866-438-7891

Customized Solutions

Let Environmental Solutions, The Dust Collection Pros, customize a fire and explosion protection solution for your organization. Here are just two examples...

In-line Spark Traps
In-line spark traps integrated into dust collection ductwork.

Flameless explosion panel and an in-line isolation gate
Flameless explosion panel and an in-line isolation gate.