Filtrowent International is STIF authorised regional distributor

EU type examination certificate


Rotary valves also called rotary feeders are used to transfer materials between two separate systems, for example from beneath the dust collector directly to the container.  Rotary valves of FZC type have modular structure and are available in different lengths and of different capacities.

The rotors are equipped with rubber seals which ensure effcient airlock between the inlet and outlet. The valve housing is made of steel sheets.

The main function of rotary valves is to prevent the air pressure loss (air leakage) while simultaneously convey material from one system to another, for example from a dust collector to pneumatic transport system.

Our rotary valves of FZC STD type comply with the essential provisions for devices of the Directive 2014/34/EU of the European Parliament and of the Council of 26th February 2014 on the harmonisation of the laws of the Member States relating to equipment and protective systems intended for use in potentially explosive atmospheres.

FZC STD rotary valves work as explosion isolation system and are devices certified by a notified body (No.: 1453, GIG, Mikołów, Poland).


St2 II 1/-D Ex h IIIB T125stC Da/-
St2 II 1/2D Ex h IIIB T125stC Da/Db
St2 II 1/3D Ex h IIIB T125stC Da/Dc
St2 II 2/-D Ex h IIIB T100stC Db/-
St2 II 2D Ex h IIIB T125stC Db
St2 II 2/3D Ex h IIIB T125stC Db/Dc


execution for explosive dusts:
– St1 i St2 (Kst max 300 [m bar/s])

resistance/ reduced explosion pressure/:
– pred ≤ 50 kPa


  • between a filter and a silo
  • between a cyclone and a silo
  • between a filter and a container
  • between a cyclone and a container
  • between a filter and a pneumatic transport installation
  • between a cyclone and pneumatic transport


  • up to three times higher efficiency when compared to the valves available on the market
  • long and failure free life of the device
  • 6 mm thick rubber blades made of high strength and abrasive-resistant materials, with additional linen reinforcement
  • wider discharge opening up to 350 mm
  • the rotor produced in welding technology and reinforced with the use of additional bulkhead connectors – wider discharge chambers between the blades are obtained
  • chain clutch – higher stability
  • equipped with a NORD cylindrical motoreducer as standard
  • equipped with a protective casing for the motroreducer as standard
  • mild start-up at valve working initiation
  • easy maintenance including demounting of the motoreducer and replacement of rubber blades
  • modular structure enables extension
  • spare parts availibility from the warehouse in Poland
Rotary valve typeRotation speed
Motor power
Maximal theoretical efficiency
Efficiency at 50% load
App. weight – rotary valve + motoreducer [kg]
FZC-500-7-STD/*210,75 lub 1,110352130
FZC-750-7-STD/*210,75 lub 1,115578185
FZC-1000-7-STD/*211,1 lub 1,5 lub 2,2207103225
FZC-2000-7-STD/*211,1 lub 1,5 lub 2,2414206420
FZC-3000-7-STD/*211,1 lub 1,5 lub 2,2621309600
Basic technical data of FZC-STD rotary valves


Standard dimensions of FZC 500, 750 and 1000

Extended dimensions of FZC 2000 and 3000