Double Dump Valve

Key Features

  • Cast iron casings which are robust and hard wearing
  • Fabricated casings for non-standard sizes and specific applications
  • Motorised actuation as standard with optional gravity counterweight or pneumatics
  • Re-greasable shaft bearings with optional seals to suit the application
  • All models and sizes available to suit high temperature applications
  • Machined inlets maximise clapper plate closing efficiency

Suitable for discharge dry dust, powder, granules and fibrous materials from cyclones, filters, hoppers etc., whilst maintaining an effective airlock.

The valve consists of two flaps connected by counterweights or spring loaded spindles, which are operated by means of a motor driven cam. The cam alternately opens each flap allowing materials to pass through the separate chambers in batch form and thereby ensuring an airlock.

After cam release, the counterweights (or springs), return each flap to the upper (sealed) position and are designed and sized so that a clapping action at the flaps is obtained, aiding material flow and preventing build up at the seal plate.

The unit is suitable for pressure differentials of up to 500mm W.G. This can be increased with special features. A fabricated steel body caters for sizes and specials that fall outside the standard 150, 200, 250 and 300mm cast iron body range as well as offering stainless steel construction. Optional hardened steel flaps and inlets can help prolong the valve life in particularly arduous or abrasive applications.

Sizes available: 150, 200, 250 and 300mm as standard constructed with cast iron bodies, with round or square inlets. Larger sizes can be accommodated.

Rotolok makes a full range of fabricated types in mild steel and stainless steel , with specials up to a maximum of 750mm.

All dimensions are in mm unless otherwise stated

SIZE A B C D E M N P Q R S T U V W X Y Z
150 152 280 8 22 241 200 320 3 97 12 14 755 440 170 375 221 5 12
200 203 343 12 22 298 200 320 3 97 12 14 755 440 170 375 221 5 12
250 254 406 12 22 362 254 370 3 114 12 14 1100 510 220 425 269 5 12
300 305 483 12 25 432 254 370 3 114 12 14 1100 510 220 425 269 5 12

All dimensions are in mm unless otherwise stated

SIZE F G H J K L M N P Q R S T U V W X Y Z
150 150 254 2 108 8 14 200 320 3 97 12 14 755 440 170 375 221 5 12
200 203 320 3 97 12 14 200 320 3 97 12 14 755 440 170 375 221 5 12
250 254 380 3 114 12 14 254 370 3 114 12 14 1100 510 220 425 269 5 12
300 305 440 3 128 12 14 254 370 3 114 12 14 1100 510 220 425 269 5 12

All dimensions are in mm unless otherwise stated

SIZE A B C D E M N P Q R S T U V W X Y Z
150 152 279 8 22 241 152 252 2 108 8 12 755 438 158 274 316 5 5
200 203 343 8 22 298 203 303 2 127 8 12 755 490 175 298 290 5 5
250 254 406 12 25 362 254 354 2 152 8 12 780 520 203 323 267 5 5
300 305 483 12 25 432 305 405 3 119 12 14 780 520 242 350 239 5 5

All dimensions are in mm unless otherwise stated

SIZE F G H J K L M N P Q R S T U V W X Y Z
150 152 252 2 108 8 12 152 252 2 108 8 12 710 435 158 274 300 5 5
200 203 303 2 127 8 12 203 303 2 127 8 12 710 409 152 300 315 5 5
250 254 354 2 152 8 12 254 354 2 152 8 12 710 435 107 325 265 5 5
300 305 405 3 119 12 14 305 405 3 119 12 14 710 460 101 350 239 5 5
350 356 456 4 102 16 14 356 456 4 102 16 14 1030 560 228 378 228 5 5

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