ISQB Intrinsically Safe Valve

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

The ISQB controls pressure using two normally closed solenoid valves, one pressure sensor and a control circuit. One valve (inlet) is actuated to allow unregulated supply media downstream into the system. The second (exhaust) valve actuates to allow working media to vent to atmosphere and with a threaded exhaust port, this can be captured. The pressure sensor provides constant feedback to the control circuit which 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 ±


Repeatability ±

Max Flow (SCFM)

Max P2 (PSI)

ISQB Downloads & Links
Documents Links Downloads
Installation Guide ISF-Series ISQB_Schematic Symbol
Sales Brochure File Request Form
ISQB Downloads & Links
Installation Guide
Sales Brochure
ISQB_Schematic Symbol
File Request Form
ISQB Technical Specifications
Pressure Range Accuracy Repeatability Max Flow
Vacuum thru 150 PSI (10.3 Bar) ±0.4% F.S. ±0.2% F.S. 0.8 SCFM (23 LPM)
Port Size Durability Operating Temps Filtration
1/8″ NPT (BSPP Available) Immune to shock & vibration (up to 25 Gs) 32-104°F (0-40°C) 40 Micron
ISQB Technical Specifications
Pressure Range
Vacuum thru 150 PSI (10.3 Bar)
±0.4% F.S.
±0.2% F.S.
Max Flow
0.8 SCFM (23 LPM)
Port Size
1/8″ NPT (BSPP Available)
Immune to shock & vibration (up to 25 Gs)
Operating Temps
32-104°F (0-40°C)
40 Micron
Protection Rating

ISQB 3D .STEP View & Download

ISQB | Internal Sense

The ISQB is a complete closed-loop system consisting of valves, manifold, housing and electronic controls. The ISQB is an intrinsically safe valve and Factory Mutual (FM) approved for Class I, II & III; Groups C, D, E, F & G. Available in a 4-20 mA differential command signal, the ISQB can be mounted in any of the above hazardous locations and installed with approved barriers (see Installation Guide for more information).

NOTE: End user must determine fitness and suitability of the ISQB control valve for their application. The ISQB requires the use of Intrinsically Safe Barriers.


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