Hazardous Location Valves

Hazardous location valves from Proportion-Air are Factory Mutual (FM) approved for hazardous areas. Rugged, vibration proof, and closed-loop for long term stability. Available in Class 1 Div 1 Groups C-G and Class 1 Div 2 Groups C-G.  Perfect for controlling low flow static applications in hazardous location areas or for providing a pilot signal to a pilot operated regulator to achieve higher flow rates under dynamic conditions.

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hazardous location valves


FM Approved Intrinisically Safe

Proportion-Air offers two FM approved hazardous location valves.

The ISF is FM approved Nonincendive with intrinsically safe process connections.

The ISQB is FM approved Intrinsically Safe with intrinsically safe barriers.

hazardous location valves


FM Approved Nonincendive

Hazardous Location Valves and Area Definitions

In accordance with article 500, National Electrical Code

Class I

Flammable Gases

Class II

Combustible Dust

Class III

Fibers & Filings

A Division 1 location is one in which ignitable concentrations of flammable gases, vapors, dust, filings or fibers may be present as a result of:

  1. They exist under normal operating conditions.
  2. They exist frequently because of repair, maintenance operations or leakage.
  3. Breakdown or faulty operation of equipment or process.

A Division 2 location is one in which ignitable concentrations of flammable liquids, gases, dust, filings or fibers may be present as a result of:

  1. Accidental rupture or breakdown of the normally closed equipment.
  2. A failure or abnormal operation of the venting equipment.
  3. Being located adjacent to a Division 1 location from which ignitable concentrations of gases, vapors, dust, filings or fibers may might occasionally be communicated.

“Intrinsically Safe,” “Explosion Proof” and “Nonincendive” are methods of protection against damage or loss of life resulting of ignition of a combustible atmosphere.

Intrinsic Safety, as a method of protection, limits the energy available in the hazardous (classified) area so, under normal operation or with a fault(s) present, an ignition and resulting explosion and fire cannot occur.

Explosion Proof, as a method of protection, completely contains any explosion and fire and quenches the resulting high temperature gasses to prevent ignition to the surrounding atmosphere.

Nonincendive is a method of protection in which any spark or thermal effect, produced under normal operating conditions, is incapable of causing ignition of a specified mixture of flammable or combustible material in air.


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