Rotary valves – ATEX protective system

Rotary valves 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.

Rotary valve – an explosion isolation device used for transferring bulk materials

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.

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

Available devices with the following marking:

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

Basic technical data and protective system parameters:

version for explosive dust of the following class:
– St1 i St2 (Kst max 300 [m bar/s])

endurance/ reduced explosion pressure:
– pred ≤ 50 kPa

EU Type Testing certificate

Certyfikat badania typu UE, celkowy zawór obrotowy izolujący wybuch, śluzy celkowe atex, śluzy obrotowe atex, śluza przeciwwybuchowa, zawór obrotowy przeciwwybuchowy, zawór celkowy przeciwwybuchowy, system ochronny atex

ATEX-Q certificate on quality assurance

The production process of our rotary valves is controlled and inspected by a notified body No 1453 – the Central Mining Institute (GIG) and we received the certificate on quality assurance No: GIG22ATEXQ117.

Location of the rotary valves:

– between the filter and the 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

Znak strefy EX


  • 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
Approximate weight of a rotary valve with a motoreducer [kg]
FZC-500-7-STD/EX210,75 or 1,110352130
FZC-750-7-STD/EX210,75 or 1,115578185
FZC-1000-7-STD/EX211,1; 1,5 or 2,2207103225
FZC-2000-7-STD/EX211,1; 1,5 or 2,2414206420
FZC-3000-7-STD/EX211,1; 1,5 or 2,2621309600
Basic technical parameters of FZC type rotary valves

Basic dimensions:

Basic module dimensions, rotary valve types 500, 750 and 1000.

Extended valve module, rotary valve type 2000 and 3000.

Rotary valve in a row connection