What is the pressure build-up time for Filter Valves?

What is the pressure build-up time for Filter Valves?

The valves used are designed to release almost explosive pulses of air that shake the dust particles off the filter bags. However, this method is not effective if the pressure rises too slowly or the flow coefficient (kv) of the filter pulse valve is too low.

The nominal diameter of the valve also has to match the filter volume. The flow coefficient and the pressure rise time therefore represent the most important technical parameters for filter valves.

If the pressure rises too slowly, the flow rate increases too gradually to shake the dust off the filter bags. Effective cleaning therefore requires the valve to open abruptly and blow a very short burst of compressed air (just a few milliseconds) into the filter.

If the flow time is too long (just a few hundred milliseconds), the cleaning is not much more effective, but the air consumption is much higher. The dust is also not shaken off if the pressure increases very quickly but the air throughput is insufficient. The volume released is then too small to subject the filter bags to a shock wave. 

For effective cleaning, the pressure rise time has to be very short and the flow coefficient (kv) as large as possible. 

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