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.

Pneumatic Drive

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.


Self Regulating

The pneumatic drive system of the pump results in a continuous balance between the flow rate of the pump and the quantity of slurry required by the filter press. The pump system thus regulates itself. Even if a valve on the discharge side is closed, the pump simply stops and has no energy consumption. When the valve is opened, the pump starts to operate again. Thanks to this property, no additional pump control units, such as pressure switches, are required.

Double Security

Even if the hose is damaged, the pump will continue to work as a simple piston pump. This means that it ensures double security. It can be repaired some days later. Damage to the hose can be detected by an optional sensor unit. The hydraulic liquid is based on biologic oil or glycerene, which are both ground-water neutral and non-toxic.