Automatic adaption
When slurry is transfered to a chamber filter press, first the chambers get filled while the pressure tends to zero. Under an increasing filling-level the solids assemble at the filter cloths. This requires a pressure that continiously rises with the increasing content of solids. Under an constant flow quantity the pressure would rise extremly fast.  

The drive of the Steinle charging pump by compressed air causes a diminution of the flow quantity according to the increasing counter-pressure in the filter press. This produces a soft filtration curve, automatically self-regulating according to the filling-level of the filter press. This is independent from the properties of the slurry. No pressure tank nor pressure transmitter nor speed control are required. The complete pump works without electric energy.

 
End of filtration process
When the filter press is filled with solids so far that no more slurry can be taken up, the pressing period is terminated. The air operation of the Tapflo pumps then reduces the flow rate to zero while the outlet pressure holds the required level compressing the filter cake.
Excellent results in drying are obtained. At the end of the pressing period the pump simply stops.

Pressure adjustment
The required pressure in the filter press is comfortably adjusted by the height of the air pressure supplying the charging pump. For a required pressure of 12 bar the pumps has to be supplied with 6 bar, when the type TF with a pressur transmission of 1:2 is applicated.

Low air consumption
The TF-pumps need the maximum air quantity only during the filling period. The more the press is filled, the more slowly the pump works. So the air consumption slowly reaches zero during progressing filtration.