STEINLE Filter Press Pumps

STEINLE Filter Press Pumps

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STEINLE pumps are double-acting, piston-diaphragm pumps with a flexible hose instead of a diaphragm. Pumping liquids into a filter press requires extremely high-performance pumps.

These pumps must deliver large quantities of liquid to the empty press, as well as small quantities at high pressure when the press is full. The liquid pressure must be maintained for a long time.

The pumps are available in FP & FH series with different pressure transmission:

  • FP – 1 : 2.4
  • FH – 1 : 3.3

STEINLE pumps are double-acting, piston-diaphragm pumps with a flexible hose instead of a diaphragm. Pumping liquids into a filter press requires extremely high-performance pumps.

These pumps must deliver large quantities of liquid to the empty press, as well as small quantities at high pressure when the press is full. The liquid pressure must be maintained for a long time.

The pumps are available in FP & FH series with different pressure transmission:

  • FP – 1 : 2.4
  • FH – 1 : 3.3
Technical specifications
Pump capacity: 18 m3/h (300 l/min)
Max. discharge pressure: 24 bares
Max. suction height: 2-5 meters
Max. particle size: 10-15 mm
Temperature: 80 °C
Body construction materials: Mild steel, SS 316, PP
Membrane construction materials: Superflex, PUR
Valve ball construction materials: CR with steel core, NBR, PU, EPDM, PTFE, SS 316, PP, PE1000
Sealing: NBR, PUR/NBR
Available sizes:
Model Max. flow rate (l/min)
FP 25/FH 25 41
FP 40/FH 40 116
FP 50/FH 50 233
FP 80/FH 80 300
Typical applications
Automobile industry Chemical and Paper Industry Filter press application Porcelain, glass and ceramics
Operation principle

Compressed air moves a pneumatic piston, which is connected to a hydraulic piston.
The hydraulic piston moves hydraulic fluid, which acts on a membrane hose, which also returns to its original shape.
When the hose is squeezed, the suspension inside is displaced and flows out.
Ball valves at the top and bottom of the hose ensure flow in only one direction.

The two extreme deformation conditions of the hose.

Accessories
Pulsation dampener
Cost worthy pulsation dampeners with 9 liters volume and an operating pressure of 16 bar are suitable for all pump sizes.
Air treatment system
The installation of an air treatment system in the air supply is always recommended. They consist of a water separator, filter, oil dosing unit and pressure regulator with pressure gauge.
Diaphragm control
This electronic unit checks the hydraulic liquid conductivity which changes when it is contaminated with the transfered slurry. A signal is generated when diaphragm is raptured or untight. This unit can be installed even when the pump is in operation.
Filling control of the filter press
By controlling the stroke frequency of the pump the level of filling in the filter press can be determinated. This can be done by an existing control unit or by a separate time control box.
Example installation

All STEINLE pumps are self-regulating. This means that no additional equipment is required. When the filter press is full, the pump simply stops. For single-acting pumps in size 25, it is recommended to use a pulsation dampener in the delivery pipe.

  • Technical specifications

  • Typical applications

  • Operation principle

  • Accessories

  • Example installation

Pump capacity: 18 m3/h (300 l/min)
Max. discharge pressure: 24 bares
Max. suction height: 2-5 meters
Max. particle size: 10-15 mm
Temperature: 80 °C
Body construction materials: Mild steel, SS 316, PP
Membrane construction materials: Superflex, PUR
Valve ball construction materials: CR with steel core, NBR, PU, EPDM, PTFE, SS 316, PP, PE1000
Sealing: NBR, PUR/NBR
Available sizes:
Model Max. flow rate (l/min)
FP 25/FH 25 41
FP 40/FH 40 116
FP 50/FH 50 233
FP 80/FH 80 300

Performance curves

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