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F 425 / FP 425 – Drum Pumps for 99.98% Residual Emptying

Less than 0.05 litres remain in a 200-litre drum

The F/FP 425 drum pump leaves less than 0.05 litres of residual fluid in a 200-litre drum. This corresponds to a maximum residual volume of just 0.02%.

An integrated non-return valve can be closed before removing the pump from the container. This prevents the fluid remaining inside the pump from flowing back into the drum.

The pump allows expensive fluids to be used almost completely. For critical fluids, it also reduces drum cleaning and disposal costs.

The F/FP 425 is available in stainless steel, polypropylene and Hastelloy C. The stainless-steel and Hastelloy C versions are also suitable for use in potentially explosive atmospheres.

View F 425 Models Compatible Motors

Features

  • With backstop
  • Two control levers for easy closing of the backflow preventer
  • With a mechanical seal to seal the inner pipe
  • Inner tube with metal core for PP
  • Versions available for hazardous areas
  • Grease-lubricated shaft bearing
  • Can be combined with various motors as needed

Advantages

  • Optimal residual drainage, e.g., with less than 0.05 L remaining in a 200-liter barrel
  • No need to “top off” to completely empty the drum
  • Reduction in drum cleaning and disposal costs
  • No loss of medium when transferring the pump from one drum to the next
  • Optimal utilization of costly fluids
  • Unique to FLUX: The metal-core-reinforced inner tube in the PP version. It prevents leaks and unnecessary wear on the mechanical seal across all operating temperature ranges
  • Temporary operation against a closed valve (dispensing nozzle, ball valve, etc.) is possible up to the specified maximum operating temperature
  • Stainless steel and Hastelloy C versions suitable for use in hazardous areas

Media Examples

  • Acids
  • Alkalis
  • Fuels
  • Highly flammable substances
  • Mineral oil products
  • Solvents

Note: Specific suitability depends on the selected material, seal, and motor configuration.

F 425 and FP 425 Models

The F 425 and FP 425 drum pumps are available in various materials and immersion depths. The selection depends on the pumped medium, the container, chemical resistance, and any potential explosion-proof requirements.

View all barrel pumps
Variants available
FP 425 Ex S-41/34 | FFKM
FP 425 Ex S drum pump
FP 425 Ex S-41/34 | FFKM
for 99.98 % residual & drum emptying. Made from stainless steel, FFKM seal.
for use in haz. area:
yes
FOOD approval:
no
material:
Stainless steel
Show product
Variants available
F 425 PP-50/34 | FKM
F 425 PP drum pump
F 425 PP-50/34 | FKM
for 99.98 % residual & drum emptying. Made from polypropylene, FKM seal, 50 mm diameter.
for use in haz. area:
no
FOOD approval:
no
material:
Polypropylene
Show product
Variants available
F 425 PP-50/34 | EPDM
F 425 PP drum pump
F 425 PP-50/34 | EPDM
for 99.98 % residual & container emptying. Made from polypropylene, EPDM seal, 50 mm diameter.
for use in haz. area:
no
FOOD approval:
no
material:
Polypropylene
Show product

Technical Specifications

The technical specifications depend on the pump model, motor, and fluid.

Characteristic Specification
Maximum flow rate 120 l/min¹
Maximum head 26 mWS²
Viscosity min. 1 mPas to max. 1,200 mPas²
Outer pipe diameter min. 41 mm³ to max. 50 mm³
Immersion depth 700, 1,000, or 1,200 mm
Outer tube material Hastelloy C, polypropylene, stainless steel
Media / Fluids Acids, alkalis, fuels, highly flammable media, mineral oil products, solvents
Seal with mechanical seal
Containers 1,000-liter IBCs, 200-liter drums

¹ The maximum flow rate is a test bench value measured with water at 20 °C at the pump’s discharge port, without accessories such as hoses, dispensing nozzles, or flow meters. The flow rate that can be achieved in practice is lower and depends on the specific application, the properties of the fluid, and the pump configuration. See technical data sheets or performance charts.

² Depends on pump model, motor, and fluid. ³ Depends on pump model.

Comparison of F 425 and FP 425 Variants

Selection Criteria Available Options
Outer Tube Material Polypropylene, stainless steel, Hastelloy C
Immersion depth 700, 1,000, or 1,200 mm
Outer tube diameter Depending on the model, 41 to 50 mm
Explosion-proof rating Stainless steel and Hastelloy C versions
Seal Mechanical seal
Containers 200-liter drums, 1,000-liter IBCs
Flow rate Depends on pump model, motor, and fluid

 

Compatible Motors for the F 425 / FP 425 Drum
Pump

The achievable flow rate depends on the combination of the pump unit, motor, fluid, and system configuration.

View All Engines
FBM 4100 | 420 W | IP 24
FBM 4100 Core battery motor
FBM 4100 | 420 W | IP 24
cordless battery motor for FLUX drum and container pumps.
battery:
without battery Ah
charger:
without charger V
for use in haz. area:
no
rated output:
0,42 kW
Show product
FBM 4100 | 420 W | IP 24
FBM 4100 Pro battery motor
FBM 4100 | 420 W | IP 24
cordless battery motor with peripheral interface.
battery:
without battery Ah
charger:
without charger V
for use in haz. area:
no
rated output:
0,42 kW
Show product
Variants available
FEM 4070 | 500 W | 230 V | 50 Hz
FEM 4070 commutator motor
FEM 4070 | 500 W | 230 V | 50 Hz
The compact drum pump motor with undervoltage protection
for use in haz. area:
no
rated output:
0,5 kW
supply voltage:
230-240 V
version motor:
commutator motor
Show product
Variants available
F 458-1 | 700 W | 230 V | 50 Hz
F 458-1 commutator motor
F 458-1 | 700 W | 230 V | 50 Hz
The robust drum pump motor without undervoltage protection
for use in haz. area:
no
rated output:
0,7 kW
supply voltage:
230-240 V
version motor:
commutator motor
Show product
Variants available
F 460 Ex EL | 460 W | 230 V | 50 Hz
F 460 Ex EL commutator motor
F 460 Ex EL | 460 W | 230 V | 50 Hz
The robust drum pump motor with explosion protection, with speed setting, with undervoltage protection.
for use in haz. area:
yes
rated output:
0,46 kW
supply voltage:
230-240 V
version motor:
commutator motor
Show product
Variants available
F 457 EL | 800 W | 230 V | 50 Hz
F 457 EL commutator motor
F 457 EL | 800 W | 230 V | 50 Hz
The most powerful commutator motor, with speed setting, with undervoltage protection.
for use in haz. area:
no
rated output:
0,8 kW
supply voltage:
230-240 V
version motor:
commutator motor
Show product
FBM 4000 Ex | 600 W | 230 V | 50-60 Hz
FBM 4000 Ex brushless motor
FBM 4000 Ex | 600 W | 230 V | 50-60 Hz
The low-wear drum pump motor with explosion protection, with speed setting, with undervoltage protection.
for use in haz. area:
yes
rated output:
0,6 kW
supply voltage:
230 V
version motor:
brushless motor
Show product
F 416 Ex | 470 W | 14 l/s
F 416-2 Ex compressed air motor
F 416 Ex | 470 W | 14 l/s
with spherical valve
motor type:
F 416-2 Ex
other comp-air mot.:
with actuating valve
rated output:
0,47 kW
Show product
F 416 Ex | 470 W | 14 l/s
F 416 Ex compressed air motor
F 416 Ex | 470 W | 14 l/s
with lockable actuating valve.
motor type:
F 416 Ex
other comp-air mot.:
with actuating valve
rated output:
0,47 kW
Show product
F 416 Ex | 470 W | 14 l/s
F 416-1 Ex compressed air motor
F 416 Ex | 470 W | 14 l/s
without valve.
motor type:
F 416-1 Ex
other comp-air mot.:
without valve
rated output:
0,47 kW
Show product
F 414 | 1100 W | 230/400 V | 50 Hz
F 414 three-phase gear motor
F 414 | 1100 W | 230/400 V | 50 Hz
Three-phase gear motor 1.1 kW for VISCOPOWER, with terminal box.
motor type:
three-phase motor
supply voltage:
230/400 V
frequency:
50 Hz
Show product

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