Dirty fluid with “filter aid powder” is fed under pressure at the filter inlet so that the filter aid powder forms a uniform layer on the filter discs in the filter shell. During this operation the filter outlet fluid is diverted back to dirty fluid tank. This operation is called “pre-coating”. It is performed every-time after the filter is cleaned & put to use again.
After pre-coating the filter is put to use by letting the filter outlet to clean fluid tank.
Generally separate pump handles the clean fluid to the machine.
To increase the time before the filter is serviced, a small amount of filter aid powder is fed periodically at the dirty pump suction point. This operation is called “body feeding”.
The filter shows excellent filtration clarity to generate very high finish on the components.
After the filter is choked, (usually at pressure drop of 1.5 bar.) the filter housing is drained, purged with compressed air & then opened. The discs are dismantled & cleaned manually using compressed air.
Super-finishing, finish grinding, honing etc. Commonly used for individual machines.