Valves / Gates / Dampers

GRUPA WOLFF’s offer includes a broad assortment of cell valves, distribution valves and throttling butterfly valves. The devices have ATEX certificates enabling their application in explosion risk zones and as an explosion decoupling system (cell valves). The devices are characterised by a high quality of workmanship and a long and reliable service.

In this segment, we offer not only the delivery but also selection of an optimum solution, installation, as well as subsequent service and repairs.

1. CELL VALVES (DOSAGE VALVES)

  • Installation at the inlet to / outlet from filters, cyclones, silos, conveyors and other process apparatus
  • Application in both the dosing process and directly in the pneumatic transport line
  • Operation in explosion risk zones (20, 21, 22 inside and 21, 22 outside the valve)
  • Decoupling explosions with pressure of up to 10 bar (g)
  • ATEX 95 certificate for the following zones: 22, 21 outside the valve 22, 21, 20 inside the valve
  • Certified explosion decoupling (cut-off) system – the feeder provides for stopping of the flame
  • impingement and is resistant to an impact of (reduced) explosion pressure of up to 10 bar(g)
    Flange sizes: DN 150 – DN 500
  • Shapes of flanges: round/round, round/rectangular
  • Material design: cast iron, stainless steel, optional coatings resistant to abrasion, corrosion, high temperature
  • Capacity up to 180 m3/h (for efficiency = 100%)
  • Maximum operating differential pressure (inlet/outlet) up to 1.5 bar
  • Dustproof bearings mounted outside the valve
  • Selection of an optimum solution
  • Installing, commissioning, service

2. DISTRIBUTION VALVES

  • In pneumatic transport lines of powders and granulates
  • Suitable also for gases
  • Operation in explosion risk zones (20, 21, 22 inside and 21, 22 outside the valve)
  • Size: DN 150 do DN 350
  • Operating pressures up to 3.5 bar
  • Operating temperatures up to + 120°C
  • Direction change angles: 22.5, 45 or 90°
  • Parts coming into contact with the product are made of stainless steel
  • Direct pneumatic drive with an actuator
  • Gland or air blown seal
  • No movable elements outside the valve
  • Operation in explosion risk zones (20, 21, 22 inside and 22 outside the valve)
  • Selection of an optimum solution
  • Installing, commissioning, service

3. THROTTLING BUTTERFLY VALVES

  • Powders, dusts, liquids, gases
  • Loose materials creating explosion hazard
  • Operation in explosion risk zones
  • Flow regulation and dosing of loose materials
  • Possibility to operate in explosion risk zones: 22, 21, 20 and 2, 1, 0
  • Maximum differential pressure: 6 – 16 bar (depending on the size)
  • Operating temperature: -40°C do + 300°C
  • Range of nominal diameters: DN 50 – DN 600
  • Mounting between flanges as per DIN, ANSI
  • Material design of the casing and the rotary disk: aluminium, stainless steel
  • Material design of the sealing element EPDM, Perbuna
  • Possible design with a pressure sealing element (caulking by means of compressed air)
  • Manual, pneumatic, electric control
  • ATEX 95 certificate for the following zones: 22, 21, 20 and 2, 1, 0
  • Design resistant to pressure impact of up to 10 bar – an ATEX certificate
  • Selection of an optimum solution
  • Installing, commissioning, service

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