Rotary Air Lock Valves


DEMECH provides a complete range of Rotary Airlocks suitable for air lock applications ranging from gravity discharge of filters, rotary valves, cyclone dust collectors, and rotary airlock storage devices to precision feeders for dilute phase and continuous dense phase pneumatic conveying systems.

Rotary Air lock valve is used in Bulk Handling System for free flowing dry powder, granular, crystal or pellets form of material. It is usually fitted below Chain conveyor / Screw Conveyor / Hopper / Silos / Bag filter / ESP/ Bins etc.

The main function of a Rotary Air lock Valve is to provide a rated Drop-through discharge, which determines the size and capacity of Rotary Air Lock Valve. Besides this, it also functions as a Rotary Airlock to seal and prevents possibility of back flow of material in a pressurized system.

The selection of a Rotary Air Lock Valve depends on three main factors i.e. Material density, Capacity desired & flowability of material. Temperature of dust and dust characteristics decide the material of construction of Rotary air lock valve.

Technical Details
  • DEMECH can supply Rotary Air Lock feeders from 1 TPH to 300 TPH capacity and inlet sizes ranging from 200 mm to 800 mm in round or square shape.
  • DEMECH specializes in fabricated Rotary Air Lock feeders but they can also be supplied in castings for the smaller sizes in some special cases.
  • The body is generally of Mild steel, lined with hard plate material such as Sailhard or Hardox to increase the life of feeder especially where the material handled is abrasive in nature. The rotor with vanes is again of mild steel material but can be manufactured in special steel of higher hardness depending on properties of material handled. DEMECH can supply the body & rotor with vanes in stainless steel material also.
  • The vane edges are provided with replaceable tips of flexible material like spring steel for achieving good sealing
  • The deep groove ball bearings are always outboard type with no possibility of handled material coming in their contact. The shaft is sealed gland packing
  • The drive arrangement for Rotary Air lock Valve can be of two types viz. (i) Direct drive using geared motor directly coupled to the feeder shaft through flexible coupling or (ii) Chain driven with primary reduction by geared motor.
Application Area
  • The Rotary Air Lock Valves are used for handling various materials - typically, cement, ore, sugar, minerals, grains, plastics, dust, fly ash, flour, gypsum, lime, coffee, cereals, pharmaceuticals etc.
  • These valves are best suited for the following industries: cement, chemicals, mining, mineral process, textile, paper, food grains, power etc.
Salient Features
  • Various combinations of Rotor Vanes to Suit Application – Number of Vanes and closed or open vanes.
  • Precision Engineered to provide minimum clearance between Rotor and Housing and thus minimum leakage
  • Good throat opening at valve entry allowing high pocket filling efficiency.
  • Minimum clearance at rotor tips and sides with body.
  • Heavy shaft diameters minimizing deflection.
  • Outboard bearings for non-contamination.
  • Packing gland type seals.
  • Air purging provision for better sealing.
  • Robust & compact design.
Clients Served
1. Mahindra Ashtech Limited.
2. SMS Siemag India Pvt.Limited
3. Athi River Mining Ltd. (ARM)
4. Alstom Projects India Pvt Limited
5. KCP Cement Limited
6. Hindustan Zinc Limited
7. Thermax ( Humboldt Project)
8. Cethar Vessels Limited
9. Fives India Limited
10. Madras Cements Limited
11. Birla Corporation Limited