Dual 440 VAC rating allows for downward compatibility with 370 VAC applications

the ASCO 8221G3 is specifically rated for water service

meaning it stays in the open position upon loss of pneumatic control air

the ECM motor control board is likely the failure point

use a multimeter to check the sensor's resistance against the manufacturer’s 10k-ohm (or applicable) thermistor chart

ASCO V710KBSV22 Valve Body 320735-701 Dual 440 VAC rating allowsThe ASCO V710KBSV22 Valve Body is a premier 2 way normally closed gas valve designed for high performance safety shutoff in commercial and industrial systems. Engineered with a durable die cast aluminum body, this 2. 5 inch unit features an optimized internal geometry that achieves a high 120 Cv flow factor, supporting capacities up to 6,470 cfh. This specific configuration includes the V22 valve seal overtravel trim, also known as Proof of Closure