Dear Basir
Air Operated Pumps certainly have its advantages , and one is dry running capability when transferring chemicals from drum unattended . It limitations are air supply requirement , for standard pumps the maximum is 8.6 bar
You need to make careful selection , ensure material of pump is compatible to your chemical
As for occasional check valve failure , maybe due to the dirt or solids stuck in between the ballcheck
Install Strainer for the purpose
Level Control can be installed by means of float switch and solenoid valve to shut off
The shut off valve can pneumatically or electrically controlled
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