The Steinle Filter Press Pump
Double Piston-Diaphragm Pump
The STEINLE pump series FP is a double-acting piston-diaphragm pump with a hose as the diaphragm. This hose is compressed by a hydraulic liquid which also restores its original shape. While the hose is compressed, the slurry inside is displaced and flows out. Ball valves on the top and bottom of the hose ensure that the flow is in one direction only.
The hose only has to separate the hydraulic liquid from the slurry and is pressure-neutral. The pressure inside and outside the hose is always the same. This is why the diaphragm has an extremely long service life besides the fact that it is never compressed totally.It only flexes in the elastic range of the material.
The hydraulic liquid is moved by a piston which is driven by another piston with a larger surface area. This big piston is driven by compressed air. The larger surface area causes an increase in pressure on the hydraulic side.
The end-point in the movement of the air piston is registered by two electronic sensors without any mechanical contact.
The signal of these switches controls an electric 5/2 solenoid valve which leads the air to the opposite side of the piston.