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QB4 PRESSURE CONTROL VALVE

QB4 PRESSURE CONTROL VALVE

Product catalog summary

Specifications

Electrical: Supply voltage is 15-24 VDC with a maximum supply current of 250mA. Command signals can be either 0-10 VDC or 4-20mA differential, with respective impedances of 10 KΩ and 100 Ω. Analog monitor signals are available in both voltage (0-10 VDC) and current (4-20mA) formats.
Mechanical: The valve supports pressure ranges from 29.9 in. Hg (vac) to 150 psig. A 40-micron filtration is recommended. The valve's linearity/hysteresis is less than ±0.3% F.S. BFSL, and accuracy is less than ±0.4% F.S. Wetted parts include nitrile elastomers and aluminum nickel-plated manifolds.
Physical: Operating temperature ranges from 32-158ºF (0-70ºC). Dimensions are 3in. x 3in. x 6.5in., with a weight of 3.7 lb. The protection rating is NEMA 4 / IP65.

Description
The QB4 is a closed-loop electronic pressure regulator featuring solenoid valves, an internal pressure transducer, and an electronic control circuit. It adjusts output pressure based on electrical input, with feedback from the pressure transducer ensuring accuracy and repeatability. Command inputs can be differential 0-10 VDC or 4-20 mA, and the device includes a standard 0-10 volt monitor signal.

Installation & Maintenance Instructions

Ensure the product matches the order and read the guide before use. All power should be off during installation or maintenance.
Use only the provided thread sealant to avoid system failures.
For pneumatic connections, a 40-micron filter is recommended, and the valve can be mounted in any position.
For electrical connections, ensure power is off and follow the specific wiring diagrams for voltage or current command valves.

Re-Calibration Procedure
Calibration is factory-set, but if needed, follow the detailed steps to adjust the SPAN and ZERO potentiometers. Ensure no system leaks or signal issues before recalibration.

Warranty
Proportion-Air products are warranted against defects for one year from manufacture. Liability is limited to repair or replacement, and improper installation voids the warranty.

Catalog excerpts

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QB4 PRESSURE CONTROL VALVE

QB4 PRESSURE CONTROL VALVE

Catalog excerpts

All Proportion-Air catalogs and technical brochures