you can field-calibrate the airflow without replacing the entire VAV controller

it serves as a critical safety interlock

making it suitable for installations requiring constant pressure despite fluctuating air demand

and compressor staging

or continuity failure when tested with a multimeter during routine servicing

Conbraco 10-616-12 Valve Refrigerant you can field-calibrate the airflowThe Conbraco 10 616 12 boiler pressure relief valve is a high capacity safety control engineered for large scale commercial and industrial hot water heating systems. Featuring a 1 1 4 inch FNPT inlet and a 1 1 2 inch FNPT outlet, this bronze body valve is factory set at 60 PSI to prevent over pressurization in high output boilers. With a verified discharge capacity of 4,596,000 BTU hr, it meets ASME Section IV requirements for pressure vessel safety.