Nonincendive Valve

The ISQB4 is temporarily unavailable. Please contact our Applications Team for support and additional information.

The ISQB4 control valve is an electronic pressure regulator designed to precisely and proportionally control the pressure of gases based on an electronic signal. The ISQB4 is an FM approved and rated Intrinsically Safe valve designed for hazardous locations (see below for complete classification).

The FM Approved Intrinsically Safe ISQB4 operates using two normally closed solenoid valves, a pressure sensor and a control circuit. One valve is actuated to allow unregulated supply media into the system. The second valve actuates to allow working media to vent to atmosphere. The pressure sensor provides feedback to the control circuit. The control circuit compares the pressure sensor feedback to the user supplied electronic command signal and actuates the appropriate valve until the two signals match.

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Accuracy ±

Max Flow (SCFM)

Max P2 (PSIG)

ISQB4 Downloads & Links
Documents Links Downloads
Installation Guide Hazardous Location Products FAQ File Request Form: Use this form to request a file other than a standard ISQB4 .STEP file
Hazardous Location Product Brochure ISQB-Series Submit the form below to download an ISQB4 .STEP File
ISQB4 Technical Specifications
Pressure Range Accuracy Repeatability Max Flow
Vacuum thru 150 PSI (10.3 Bar) ±0.5% F.S. ±0.15% F.S. 200 SCFM (5,667 LPM)
Port Size Durability Operating Temps Filtration
1/2″ NPT Immune to shock & vibration (up to 25 Gs) 32-104°F (0-40°C) 100 Micron

ISQB4 | Intrinsically Safe

The ISQB4 Intrinsically Safe valve is rated by Factory Mutual (FM) and approved for specific hazardous locations including: Class I, II, III, Division 1, Groups C, D, E, F and G. The ISQB4 may be used with any non-corrosive compressible media compatible with the wetted materials.

Special Condition for Use:
The apparatus enclosure contains aluminum which is considered to constitute a potential risk of ignition by impact or friction. Care must be taken into account during installation and use to prevent impact or friction.

NOTES: End user must determine fitness and suitability of the ISQB4 control valve for their application. The ISQB4 requires the use of Intrinsically Safe barriers.

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