What is the usual cause of an abnormal humming noice during the - ProProfs Discuss
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What is the usual cause of an abnormal humming noice during the operation of backflow prevention assembly?



A. Abnormal operating pressure
B. Tthe shut-off valve is not fully open and air is trapped in the device
C. Excessive backpressure
D. Check dice compression

This question is part of Backflow qiz 3
Asked by Pbarton, Last updated: Jan 12, 2020

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pbarton

Pbarton

Answered Jan 12, 2018

The shut-off valve is not fully open and air is trapped in the...Read More
 

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