Blowthrough / Blowing Seals

Key Features

  • Maximum number of blades in contact with body at one time without affecting throughput
  • Streamlined entry and discharge of conveying air through valve
  • Good throat opening at valve entry allowing high pocket filling efficiency
  • Compact design minimising headroom
  • Minimum clearance at rotor tips and sides with body
  • Robust body adequately stiffened to prevent distortion
  • Heavy shaft diameters minimising deflection
  • Outboard bearings for noncontamination - options for high temperature
  • Packing gland type seals with air purging option
  • Precision machining of components
  • Abrasive duty types

Blowthrough/blowing seals meet the specific needs of the pneumatic conveying industry, a natural extension to the Rotary Airlock; both products are used to regulate the flow of dry powder, dust or granular product, while maintaining an airlock.

The blowthrough/blowing seal has distinct advantages for the specialist as it introduces high pressure conveying air through the valve body and rotor pocket ensuring – HIGH EFFICIENCY THROUGHPUT WITH LOW EFFECTIVE PRESSURE DROP.

This is achieved by the fact that more blades are in contact for longer periods with the valve body resulting in less air leakage – and by blowing through the rotor each rotor pocket is efficiently emptied.

The Rotolok range of seals is robustly constructed with an emphasis on close tolerances and minimal eccentricities, making the unit suitable for the majority of pneumatic conveying applications.

The general market place covers Cyclones, Bag Houses and Gravity Feed applications with pressures around +/- 3 psi

  • Body

    Cast Iron or Stainless Steel precision machined

  • End Covers

    Cast Iron or Stainless Steel spigot located in body

  • Rotor

    Fabricated Mild or Stainless Steel fixed bladed open type

  • Bearings

    Ball type sealed for life – alternative high temperature to 400°C

  • Seal

    PTFE packing gland

  • Drive

    TEFC geared motor unit side wall mounted to valve body and complete with taper lock chain drive in an enclosed guard. Option: flameproof, variable speed etc.

  • Hard Chrome Internals
  • Electro-less Nickel Plating
  • Shear Plate Deflectors
  • Direct Coupled Drives
  • Flameproof Motors
  • Air Purge Glands
  • Speed Switches
  • Body Vents
  • Vent Boxes
  • V.S. Drives

All dimensions are in mm unless otherwise stated

SIZE A A1 B B1 C D E F G H J K L M N P Q R S T W X Y Z AA AB AC AD AE AF AG kW
125 125 125 205 205 12 110 240 240 159 241 320 219 180 28 95 8 10 8 7 80 90 170 90 170 90 125 95 50 11.5 20 78 0.37
200 200 200 300 300 12 160 340 200 199 281 350 258 218 28 125 8 13 8 7 100 130 270 130 270 130 190 130 75 11.5 20 110 0.37
240 180 200 280 280 15 180 340 220 225 327 435 287 245 40 165 8 * 12 8 110 130 250 100 250 130 225 110 65 14 20 100 0.75
280 225 270 345 370 15 206 436 180 259 361 460 320 278 40 190 8 13 12 8 160 180 335 180 307 180 307 170 98 14 20 130 0.75
360 255 350 350 450 15 240 466 171 315 427 595 386 335 50 240 10 14 14 9 200 2@150 420 180 320 2@150 320 180 110 14 22 144 1.1
450 310 400 410 510 15 290 500 136 350 465 625 421 370 50 270 10 14 14 9 230 2@160 480 220 380 2@160 380 200 125 14 22 154 1.1

All dimensions are in mm unless otherwise stated

SIZE A B C D E F G H J K L M N O P Q R S T V W Y Z kW
150 154 285 12 140 270 225 193 275 365 260 224 30 143 8 22 241 8 7 85 60 52 295 368 0.37
200 203 343 15 160 340 223 199 281 350 259 218 28 125 8 22 298 8 7 100 89 78 301 374 0.37
250 254 406 15 200 380 195 252 347 440 320 284 35 155 12 25 362 10 8 117 89 78 354 427 0.75
300 305 483 19 240 465 200 282 374 480 350 314 35 195 12 25 432 10 8 142 102 89 384 457 0.75
400 406 597 20 300 580 94 348 484 565 456 398 60 235 16 28 540 18 11 179 141 128 450 523 1.1

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