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Offset Airlock

offset airlock valve offset airlock valve usa Offset Airlock - Rotolok USA
offset airlock valve offset airlock valve usa Offset Airlock - Rotolok USA

Key Features

  • Maximum number of blades in contact with body at one time without affecting throughput
  • Good throat opening at valve entry allowing high pocket fillage efficiency
  • Robust body adequately stiffened to prevent distortion
  • Heavy shaft diameters minimizing deflection
  • Outboard bearings for non-contamination
  • Packing gland type seals
  • Maximizing valve speed to 25 RPM prolonging life, ensuring good throughput
  • Precision machining of components
  • Options available for specialization
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The main feature of a Rotary Airlock is to regulate the flow of material from one chamber to another while maintaining a good airlock condition. The material or product being handled is usually dry free flowing powder, dust or granules.

The granule type of product, especially if it is a plastic type, polythene or nylon etc., does not shear easily and consequently, without considerable care the standard drop-through type of valve leads to valve seizure and also considerable shock loadings.

To minimize these problems the Offset Rotary Airlock ensures lower pocket fillage as its design means that the rotor is still being filled in the upward cycle with the pellets falling away at the shear point. Similarly, the pelican beak distributes the product across the full width of the rotor.

Offset Rotary Airlocks are offered in sizes ranging from 8″ up to 20″.

  • Bodies

    Cast Iron, Stainless Steel or Aluminum precision bored.

  • End Covers

    Cast Iron, Stainless Steel or Aluminum spigot located inbody for concentricity.

  • Rotor

    Fabricated Mild or Stainless Steel.

  • Bearings

    Generally sealed-for-life-ball type rigged outboard or high temperature above 480ºF

  • Shaft Seal

    Gland type with PTFE packing.

  • Drive

    TEFC C-Face motor mounted to parallel shaft Gearbox and complete with taper lock sprockets chain drive all in an enclosed guard

Offset Airlock Square Valve Diagram

All dimensions are in inches unless otherwise stated

SIZE A A1 B B1 C D E F G H J K
8’’ 7 ⅞’’ 6’’ 12’’ 10’’ ½’ 6 ½’’ 13’’ 14 ⅝’’ 7 ⅞’’ 11 ⅛’’ 17 ¼’’ 10 ¼’’
10’’ 10’’ 7’’ 14’’ 11’’ ⅝’’ 8’’ 16’’ 11 ⅞’’ 9’’ 12 ¼’’ 18 ⅞’’ 11 ⁷⁄₁₆’’
12’’ 12’’ 8’’ 16’’ 12’’ ¾’’ 9’’ 18’’ 11 ⅝’’ 10 ¼’’ 14 ¼’ 20 ⅛’’ 12 ⅝’’
16’’ 16’’ 10’’ 22’’ 16’’ ⅞’’ 11’’ 22’’ 7 ¾’’ 13 ⅛’’ 17 ⅛’’ 24 ⅝’’ 15 ⅞’’
18’’ 18’’ 11’’ 24’’ 17’’ ⅞’’ 12 ⅞’’ 25 ¾’’ 8 ⅞’’ 14’’ 18’’ 26 ¼’’ 16 ½’’
20’’ 20’’ 12’’ 26’’ 18’’ 1’’ 14 ³⁄₁₆’’ 28 ⅜’’ 7 ⅞’’ 15’’ 19’’ 26 ¼’’ 17 ⅞’’
Offset Airlock Square Valve Diagram

All dimensions are in inches unless otherwise stated

SIZE L M N O P R S T V W X Y HP
8’’ 8 ⅝’’ 28mm 5 ¼’’ 8 ⁹⁄₁₆’’ 8mm 7mm 1 ⅝’’ 10 ¾’’ 7’’ 8 ¾’’ 5’’ 1
10’’ 9 ¾’’ 35mm 6 ⅛’’ 8 ⁹⁄₁₆’’ 10mm 8mm 1 ⅞’’ 12 ¾’’ 6’’ 9 ¾’’ 6’’ 1
12’’ 11’’ 35mm 7 ¼’’ 8 ⁹⁄₁₆’’ 10mm 8mm 2 ⅜’’ 14 ¾’’ 7 ¼’’ 10 ¾’’ 6 ½’’ 1 ½
16’’ 13 ⅞’’ 50mm 9 ¼’’ 14 ¾’’ 14mm 9mm 3 ⅜’’ 20 ¼’’ 10 ½’’ 14 ¼’’ 6’’ 1 1½
18’’ 14 ⅞’’ 50mm 10 ¼’’ 14 ¾’’ 14mm 9mm 3 ⅜’’ 22 ¼’’ 11’’ 15 ¼’’ 6’’ 2
20’’ 15 ¾’’ 50mm 11 ¼’’ 14 ¾’’ 14mm 9mm 3 ⅞’’ 24 ¼’’ 12’’ 16 ¼’’ 6’’ 3
Offset Airlock Circular Valve Diagram

All dimensions are in inches unless otherwise stated

SIZE ØA ØB C D E F G H J K
8’’ 8’’ 13 ½’’ ⅝’’ 6 ½’’ 13’’ 13’’ 7 ⅞’’ 11 ⅞’’ 20 ⅜’’ 10 ¼’’
10’’ 10’’ 16’’ ¾’’ 7 ½’’ 15’’ 12 ⅞’’ 9’’ 12 ¼’’ 22 ¼’’ 11 ⅜’’
12’’ 12’’ 19’’ ¾’’ 8 ¾’’ 17 ½’’ 10 ⅝’’ 10 ¼’’ 14 ¼’’ 24 ⅝’’ 12 ⅝’’
14’’ 14’’ 21’’ ⅞’’ 10 ½’’ 21’’ 10 ¼’’ 10 ⅝’’ 14 ⅝’’ 25 ⅝’’ 13’’
20’’ 20’’ 27 ½’’ 1’’ 14’’ 28’’ 8 ⅞’’ 15’’ 19’’ 30 ⁹⁄₁₆’’ 17 ⅞’’
Offset Airlock Circular Valve Diagram

All dimensions are in inches unless otherwise stated

SIZE L ØM N O ØP ØQ R S T HP
8’’ 8 ⅝’’ 28mm 7 ⅞’’ 8 ⅞’’ 11 ¾’’ 8mm 7mm 3 ⅜’’ 1
10’’ 9 ¾’’ 35mm 9 ¾’’ 12 1’’ 14 ¼’’ 10mm 8mm 4 ¼’’ 1
12’’ 11’’ 35mm 11 ⁵⁄₁₆’’ 12 1’’ 17’’ 10mm 8mm 5’’ 1 ½
14’’ 11 ⅜’’ 35mm 13’’ 12 1 ⅛’’ 18 ¾’’ 10mm 8mm 5 ½’’ 1
20’’ 15 ⅞’’ 50mm 15 ½’’ 20 1 ¼’’ 25’’ 14mm 9mm 7 ⅞’’ 3