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Coru-Dek® V Vacuum Cylinder

The CORU-DEK® V Vacuum Cylinder was developed by GL&V with industry proven technology to provide high consistency stock discharge for improved washing and thickening. The CORU-DEK V design incorporates the industry proven louvered corrugated deck to eliminate rewetting and to enhance vacuum control.

The CORU-DEK V combines the continuous shell construction and increased hydraulic capacity of the CORU-DEK III design with a duel shaft and enhanced maintenance feature. This provides the today’s mills with the most modern vacuum filter offered to the Pulp and Paper industry.

Developed in 1998, the CORU-DEK® V Vacuum Cylinder has been the top innovative solution to replacement Vacuum Cylinder. With industry proven technology, the CORU-DEK V cylinder provides high consistency stock discharge for improved washing and thickening. It incorporates GL&V’s legendary louvered corrugated decking and end drainage design.

The CORU-DEK V Vacuum Washer cylinder incorporates a vat seal at the drainage end of the cylinder, used to seal the filtrate from the fiber slurry in the vat, as well as seal the vacuum from the atmosphere. This seal is called a V-Seal, and spans the gap between the fixed ring on the vat wall and a rotating ring on the washer cylinder. The V-Seal reduces the impact of misalignments between the moving and fixed rings which affected the longevity of conventional deckle strap type seals. As the name suggests, the V-Seal is shaped like a wedge. Rotating and fixed rings have a tapered face on the mating sides, and the seal rides in the resultant “v” shaped gap created between the rings. Because of the wide sealing surface and the captive position of the V-Seal, a positive seal is maintained even if the rotating and fixed rings are not perfectly aligned. 

The CORU-DEK V design can be manufactured in a variety of sizes with GL&V offering standard sizing of 8’ diameter, 9’6’’ diameter, 11’6’’ diameter and 13’6’’ diameter machines ranging from 8’ to 32’ in length with custom sizing available. They are built utilizing a solid duel shaft design, anti-friction bearings, conventional sealing, and common parts contribute to the increased mechanical reliability of the vacuum washer. The dual shaft also allows the cylinder to be driven from either end.

GL&V has been at the leading edge of furnishing shaft-mounted drives on pulp washing equipment, including Vacuum Washers, Pressure Washers, and Twin-Roll Presses. For Vacuum Washers, we have used a number of different purchased gear drives in the past, but have established Rexnord as our standard planetary gear box. The shaft mounted drive is standard with the CORU-DEK V system.

  • CORU-DEK® V Vacuum Cylinder Operation
    • Vacuum washers are generally used for displacement washing or pulp thickening. All vacuum washers use pressure differential to pick up a fiber ‘mat’ on the decking surface of the cylinder. From there filtrate from washing showers passes through the fiber mat and eventually through the face wire onto the corrugated drainage deck with circumferential channels. The deck channels carry the filtrate through louvered accelerators to longitudinal channels. Channels are formed by the deck sections support grids along the drum surface. The deck support channels direct the filtrate to the cylinder head where radial channels direct the filtrate to the valve seat. A cylinder valve with preset clearances dictates vacuum application and shutoff. Once past the valve, the filtrate will pass directly to the discharge elbow. The discharge elbow is connected to the drop leg leading to a filtrate tank below. The siphon action of the drop leg arrangement creates the required pressure differential or vacuum.
  • Shaft Design
    • Shaft sizing and metallurgy depend on a variety of conditions. While sizing is typically based off of cylinder length with our standard sizes being 10 ¾ “ diameter shafts for 8’ and 9’6’’ diameter cylinders and 15” diameter shafts for 11’6’’ and 13’6’’ diameter cylinders. Custom sizing is available at customer request. Choice of metallurgy greatly depends on existing or forecasted process conditions.
  • Deck Design
    • Introduced in 1968 the corrugated deck traps filtrate, preventing sheet re-wetting in the sheet take off zone, thus maintaining high consistency. The louvers direct the flow to the end of the drum. The directing action of the louver and the hydraulic control of the end drainage bucket, assist flow and provide a smooth path to the valve area, reducing air entrainments.
  • V-Deckle Seal Assembly
    • The V-Seal is manufactured from a durable HMW plastic, eliminating the requirement for the metal backing strap, felt, and more significantly the metal to felt glued joint. The ends of the V-Seal overlap in a tongue-and-groove arrangement with room for expansion. Tension on the seal is applied with a spring and cable arrangement that is similar to the conventional deckle strap.
  • End Drainage Design
    • The end drainage design does not require the center drainage ports and internal piping of conventional vacuum machines. The elimination of the center drainage ports allows a continuous cylindrical construction. This reduces the number of welded seams resulting in a stronger unit. Additionally, fewer seams help to eliminate any possibility of leaks.
  • Shaft Mounted Drives
    • The standard drive arrangement employs a proprietary double torque arm arrangement developed by GL&V with a hollow-shaft reducer and shrink disc, a top mounted motor mount with sheaves, timing belt, and guard.
  • Material Selection
    • GL&V offers the CORU-DEK V cylinder in Steel, 304L, 316L, 317L, 6-7% Moly , Duplex 2101, Duplex 2205, and Duplex 2507. With our legacy of supplying OEM drums for numerous Pulp and Paper applications, we would be happy to provide our recommendation for metallurgy for your specific process.
  • Design Improvements
    • Greater surface area contact
  • V-Seal
    • More forgiving to misalignment then old conventional seals
    • No felt to tear or wear and no glue required to secure felt to backing plate
    • Seal material provides a longer service life in any brown or bleach application
    • Stainless Steel wire cable and spring tension secure the seal in the groove
  • Anti-Rewet Decking
    • As a standard on CORU-DEK® III systems, GL&V’s anti-rewet decking prevents rewetting while also reducing air in system, increasing vacuum, and ultimately allows for improved sheet pick up
  • Cost Savings
    • Elimination of internal piping due to end drainage design
    • Increased number of common parts
  • Experience
    • As the true OEM for Vacuum Washers, GL&V has the experience of installing numerous Vacuum Washers in various pulping applications such as Kraft, Chemical and Dissolving Pulp.
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Coru-Dek® V Vacuum Cylinder

The CORU-DEK® V Vacuum Cylinder was developed by GL&V with industry proven technology to provide high consistency stock discharge for improved washing and thickening. The CORU-DEK V design incorporates the industry proven louvered corrugated deck to eliminate rewetting and to enhance vacuum control.

The CORU-DEK V combines the continuous shell construction and increased hydraulic capacity of the CORU-DEK III design with a duel shaft and enhanced maintenance feature. This provides the today’s mills with the most modern vacuum filter offered to the Pulp and Paper industry.

  • Further Details

    Developed in 1998, the CORU-DEK® V Vacuum Cylinder has been the top innovative solution to replacement Vacuum Cylinder. With industry proven technology, the CORU-DEK V cylinder provides high consistency stock discharge for improved washing and thickening. It incorporates GL&V’s legendary louvered corrugated decking and end drainage design.

    The CORU-DEK V Vacuum Washer cylinder incorporates a vat seal at the drainage end of the cylinder, used to seal the filtrate from the fiber slurry in the vat, as well as seal the vacuum from the atmosphere. This seal is called a V-Seal, and spans the gap between the fixed ring on the vat wall and a rotating ring on the washer cylinder. The V-Seal reduces the impact of misalignments between the moving and fixed rings which affected the longevity of conventional deckle strap type seals. As the name suggests, the V-Seal is shaped like a wedge. Rotating and fixed rings have a tapered face on the mating sides, and the seal rides in the resultant “v” shaped gap created between the rings. Because of the wide sealing surface and the captive position of the V-Seal, a positive seal is maintained even if the rotating and fixed rings are not perfectly aligned. 

    The CORU-DEK V design can be manufactured in a variety of sizes with GL&V offering standard sizing of 8’ diameter, 9’6’’ diameter, 11’6’’ diameter and 13’6’’ diameter machines ranging from 8’ to 32’ in length with custom sizing available. They are built utilizing a solid duel shaft design, anti-friction bearings, conventional sealing, and common parts contribute to the increased mechanical reliability of the vacuum washer. The dual shaft also allows the cylinder to be driven from either end.

    GL&V has been at the leading edge of furnishing shaft-mounted drives on pulp washing equipment, including Vacuum Washers, Pressure Washers, and Twin-Roll Presses. For Vacuum Washers, we have used a number of different purchased gear drives in the past, but have established Rexnord as our standard planetary gear box. The shaft mounted drive is standard with the CORU-DEK V system.

  • Technical Information

    • CORU-DEK® V Vacuum Cylinder Operation
      • Vacuum washers are generally used for displacement washing or pulp thickening. All vacuum washers use pressure differential to pick up a fiber ‘mat’ on the decking surface of the cylinder. From there filtrate from washing showers passes through the fiber mat and eventually through the face wire onto the corrugated drainage deck with circumferential channels. The deck channels carry the filtrate through louvered accelerators to longitudinal channels. Channels are formed by the deck sections support grids along the drum surface. The deck support channels direct the filtrate to the cylinder head where radial channels direct the filtrate to the valve seat. A cylinder valve with preset clearances dictates vacuum application and shutoff. Once past the valve, the filtrate will pass directly to the discharge elbow. The discharge elbow is connected to the drop leg leading to a filtrate tank below. The siphon action of the drop leg arrangement creates the required pressure differential or vacuum.
    • Shaft Design
      • Shaft sizing and metallurgy depend on a variety of conditions. While sizing is typically based off of cylinder length with our standard sizes being 10 ¾ “ diameter shafts for 8’ and 9’6’’ diameter cylinders and 15” diameter shafts for 11’6’’ and 13’6’’ diameter cylinders. Custom sizing is available at customer request. Choice of metallurgy greatly depends on existing or forecasted process conditions.
    • Deck Design
      • Introduced in 1968 the corrugated deck traps filtrate, preventing sheet re-wetting in the sheet take off zone, thus maintaining high consistency. The louvers direct the flow to the end of the drum. The directing action of the louver and the hydraulic control of the end drainage bucket, assist flow and provide a smooth path to the valve area, reducing air entrainments.
    • V-Deckle Seal Assembly
      • The V-Seal is manufactured from a durable HMW plastic, eliminating the requirement for the metal backing strap, felt, and more significantly the metal to felt glued joint. The ends of the V-Seal overlap in a tongue-and-groove arrangement with room for expansion. Tension on the seal is applied with a spring and cable arrangement that is similar to the conventional deckle strap.
    • End Drainage Design
      • The end drainage design does not require the center drainage ports and internal piping of conventional vacuum machines. The elimination of the center drainage ports allows a continuous cylindrical construction. This reduces the number of welded seams resulting in a stronger unit. Additionally, fewer seams help to eliminate any possibility of leaks.
    • Shaft Mounted Drives
      • The standard drive arrangement employs a proprietary double torque arm arrangement developed by GL&V with a hollow-shaft reducer and shrink disc, a top mounted motor mount with sheaves, timing belt, and guard.
    • Material Selection
      • GL&V offers the CORU-DEK V cylinder in Steel, 304L, 316L, 317L, 6-7% Moly , Duplex 2101, Duplex 2205, and Duplex 2507. With our legacy of supplying OEM drums for numerous Pulp and Paper applications, we would be happy to provide our recommendation for metallurgy for your specific process.

  • Benefits

    • Design Improvements
      • Greater surface area contact
    • V-Seal
      • More forgiving to misalignment then old conventional seals
      • No felt to tear or wear and no glue required to secure felt to backing plate
      • Seal material provides a longer service life in any brown or bleach application
      • Stainless Steel wire cable and spring tension secure the seal in the groove
    • Anti-Rewet Decking
      • As a standard on CORU-DEK® III systems, GL&V’s anti-rewet decking prevents rewetting while also reducing air in system, increasing vacuum, and ultimately allows for improved sheet pick up
    • Cost Savings
      • Elimination of internal piping due to end drainage design
      • Increased number of common parts
    • Experience
      • As the true OEM for Vacuum Washers, GL&V has the experience of installing numerous Vacuum Washers in various pulping applications such as Kraft, Chemical and Dissolving Pulp.

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