The Steinle Filter Press Pump

The Tapflo-Pump

Quality for Filter Presses

The company Tapflo AB was founded in Kungälv (north of Gothenburg) 1985 and has been working with the design and manufacture of air operated diaphragm pumps since that time. These pumps are especially qualified for applications in the high pressure domain. The company Steinle therefor exclusivly employs Tapflo pumps in the TF-series for filter press charging.

Double-acting diaphragm pump

The Tapflo air operated diaphragm pumps belong to the group of displacement pumps. They are driven by compressed air.

Two diaphragms, connected by a shaft, are being pushed back and forth by alternatingly pressurizing the air chambers behind the diaphragms by means of an automatically cycling air valve system. The air valve switches over as soon as one diaphragm has reached the end position.

While one diaphragm transmits the force from the air pressure onto the liquid in the housing, the opposite pressure-relieved diaphragm creates a suction action when being pulled back from the housing. Therefor the slurry flows into the chambers and gets driven out by the next stroke. The chamber is alternatingly opened and closed by valve balls. During each cycle the air pressure on the back of the discharging diaphragm is equal to the head pressure on the slurry side. This is the reason for the long life time of the diaphragms even at high pressure applications.

Air valve

The air valve provides for the reliable switching over of the strokes . It consists of brass and is equipped with self-lubricating seals. It does not require any kind of lubrication and reliably switches over from any position to another. The air valve is maintainance free and, when inquired, also available in stainless steel.


The sandwich PTFE diaphragm does not require any external plate. Its surface is perfectly smooth. It can be applied up to 120°C and is consistent against almost all chemicals. The EPDM and NBR diaphragms show particular mechanical qualities. Applicable up to 120°C EPDM and 90°C NBR.