Written by Rick
Air Diaphragm Pump Start-up Pressure
As a rule of thumb, the start-up pressure of Air Operated Diaphragm Pumps should be set at 2,0 bar. Then, manually using air valve increases to the required maximum pressure. Or, automatically by utilizing installed on air supply line Slow Start Valve. Starting Air Diaphragm Pump at the full, or too high air pressure creates violent, sudden shock for all pump elements. This can result in dramatic reduction of diaphragms lifetime. Especially vulnerable are PTFE diaphragms.
Too high supplied air pressure at the start-up, while the pump is not filled with a liquid cause diaphragm over stretch.
Valve balls have no enough time to close valve seat to create vacuum – pump capability to suck liquid into the pump is limited. Pump suction capability is reduced significantly.
When handling abrasive fluids, the settled-out solids should be expelled prior to the pump being operated at full flow and pressure. If this doesn’t happen, the settled solids can damage diaphragms, block ball valves. And in case of fluids prone to solidification bend or broke connecting rod.
Slow Start Valve gently feeds compressed air into the pump, eliminating shock placed upon equipment. Reduces wear on the diaphragms and other parts, extending the life of the entire pump. Slow Start Valve with gradually increased air supply to the pump greatly improves suction lift ability of the pump.
The rule of thumb is to install Slow Start Valve with High Pressure Air Diaphragm Pumps.
And with AODD pumps, which works as a feed pumps in filter press applications.
Unfortunately, this is often overlooked, causing premature diaphragm rupture due to unbalanced diaphragm pump operation in filter press applications. It is recommended to start filter press feeding process at 2,0 bar. Then, gradually increase the pressure at steady intervals to the maximum pressure. This protects diaphragms and allows gently transport of the solids to be filtered and filtration additives with the least possible shear stress.
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