ST / CT Series: Inline Vacuum Pump Filters

Solberg’s ST/CT Series Vacuum Pump Filters are ideal for rough to medium vacuum applications.  Our inline vacuum filters have compact designs that offer small service footprints, easy access, and the ability to conduct maintenance in tight spaces. These inlet vacuum filters are effective across a broad range of vacuum pump applications,  are suitable for heavy particulate loads, and can remove liquids carried over from a process. Multiple filter element media options are available to provide superior protection and longevity for your vacuum pump.

Solberg's inlet filters offer two construction options:

ST Series: 

  • Includes a cast aluminum head and a clear polycarbonate see-through collection bucket
  • Facilitates visual inspection of filter elements without disassembling the housing
  • Provides exceptional durability in harsh operating environments  
  • Available in ¾-4 inch connection sizes

CT Series: 

  • Includes a cast aluminum head and a heavy-duty metal collection bucket  
  • Provides exceptional durability in harsh operating environments 
  • Available in ¾-6 inch connection sizes

Contact us for more information on our ST/CT Series inlet filters. We will guide you to the right filtration products for your application.

  • ST CT Family
ST CT Family
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Specifications

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Model Inlet Connection Size (in.) Outlet Connection Size (in.) Connection Type Flow (SCFM) Dim A (in.) Dim B (in.) Dim C (in.) Dim D (in.) Dim E (in.) Holding Capacity (gal) Media Micron Rating Replacement Element SelectorConnectionSizeImperial
CT-234P-300C 3 3 FPT 300 18.63 2.75 13.50 13.00 9.00 Paper 2.0 234P 3" to 6" Add To Cart
CT-234P-400C 4 4 FPT 520 18.63 2.75 13.50 13.00 9.00 Paper 2.0 234P 3" to 6" Add To Cart
CT-235P-300C 3 3 FPT 300 18.63 2.75 13.50 13.00 9.00 Polyester 5.0 235P 3" to 6" Add To Cart
CT-235P-400C 4 4 FPT 520 18.63 2.75 13.50 13.00 9.00 Polyester 5.0 235P 3" to 6" Add To Cart
CT-274P-600C 6 6 FPT 1100 18.25 3.88 19.00 9.87 10.00 Paper 2.0 274P 3" to 6" Add To Cart
CT-275P-600C 6 6 FPT 1100 18.25 3.88 19.00 9.87 10.00 Polyester 5.0 275P 3" to 6" Add To Cart
CT-8450-075C .75 .75 NPSC 25 8.45 1 5 6.2 5.5 Paper 2.0 8450 Add To Cart
CT-8451-075C .75 .75 NPSC 25 8.45 1 5 6.2 5.5 Polyester 5.0 8451 Add To Cart
CT-850-200C 2 2 NPSC 175 12.81 2.00 9.00 9.00 9.00 Paper 2.0 850 Up to 2.5" Add To Cart
CT-850-250C 2.5 2.5 FPT 210 12.81 2.00 9.00 9.00 9.00 Paper 2.0 850 Up to 2.5" Add To Cart
CT-850P-200C 2 2 NPSC 175 12.81 2 9 9 9 Paper 2.0 850P Up to 2.5" Add To Cart
CT-850P-250C 2.5 2.5 FPT 210 12.81 2 9 9 9 Paper 2.0 850P Up to 2.5" Add To Cart
CT-851-200C 2 2 NPSC 175 12.81 2.00 9.00 9.00 9.00 Polyester 5.0 851 Up to 2.5" Add To Cart
CT-851-250C 2.5 2.5 FPT 210 12.81 2.00 9.00 9.00 9.00 Polyester 5.0 851 Up to 2.5" Add To Cart
CT-851P-200C 2 2 NPSC 175 12.81 2 9 9 9 Polyester 5.0 851P Up to 2.5" Add To Cart
CT-851P-250C 2.5 2.5 FPT 210 12.81 2 9 9 9 Polyester 5.0 851P Up to 2.5" Add To Cart
CT-896-100C 1 1 NPSC 40 13.13 1.50 7.00 10.13 9.00 Paper 2.0 896 Up to 2.5" Add To Cart
CT-896-125C 1.25 1.25 NPSC 60 13.13 1.50 7.00 10.13 9.00 Paper 2.0 896 Up to 2.5" Add To Cart
CT-896-150C 1.5 1.5 NPSC 80 13.13 1.50 7.00 10.13 9.00 Paper 2.0 896 Up to 2.5" Add To Cart
CT-897-100C 1 1 NPSC 40 13.13 1.50 7.00 10.13 9.00 Polyester 5.0 897 Up to 2.5" Add To Cart
CT-897-125C 1.25 1.25 NPSC 60 13.13 1.50 7.00 10.13 9.00 Polyester 5.0 897 Up to 2.5" Add To Cart
CT-897-150C 1.5 1.5 NPSC 80 13.13 1.50 7.00 10.13 9.00 Polyester 5.0 897 Up to 2.5" Add To Cart
ST-234P-300C 3 3 FPT 300 18.63 2.75 13.50 13.00 9.00 Paper 2.0 234P 3" to 6" Add To Cart
ST-234P-400C 4 4 FPT 520 18.63 2.75 13.50 13.00 9.00 Paper 2.0 234P 3" to 6" Add To Cart
ST-235P-300C 3 3 FPT 300 18.63 2.75 13.50 13.00 9.00 Polyester 5.0 235P 3" to 6" Add To Cart
ST-235P-400C 4 4 FPT 520 18.63 2.75 13.50 13.00 9.00 Polyester 5.0 235P 3" to 6" Add To Cart
ST-8450-075C .75 .75 NPSC 25 8.38 1 5 6.13 5.2 Paper 2.0 8450 Add To Cart
ST-8451-075C .75 .75 NPSC 25 8.38 1 5 6.13 5.2 Polyester 5.0 8451 Add To Cart
ST-850/1-200C 2 2 NPSC 175 12.81 2.00 9.00 9.00 9.00 Paper 2.0 850/1 Up to 2.5" Add To Cart
ST-850/1-250C 2.5 2.5 NPSC 210 12.81 2.00 9.00 9.00 9.00 Paper 2.0 850/1 Up to 2.5" Add To Cart
ST-851/1-200C 2 2 NPSC 175 12.81 2.00 9.00 9.00 9.00 Polyester 5.0 851/1 Up to 2.5" Add To Cart
ST-851/1-250C 2.5 2.5 FPT 210 12.81 2.00 9.00 9.00 9.00 Polyester 5.0 851/1 Up to 2.5" Add To Cart
ST-896-100C 1 1 NPSC 40 13.13 1.25 7.00 10.13 9.00 Paper 2.0 896 Up to 2.5" Add To Cart
ST-896-125C 1.25 1.25 NPSC 60 13.13 1.25 7.00 10.13 9.00 Paper 2.0 896 Up to 2.5" Add To Cart
ST-896-150C 1.5 1.5 NPSC 80 13.13 1.25 7.00 10.13 9.00 Paper 2.0 896 Up to 2.5" Add To Cart
ST-897-100C 1 1 NPSC 40 13.13 1.25 7.00 10.13 9.00 Polyester 5.0 897 Up to 2.5" Add To Cart
ST-897-125C 1.25 1.25 NPSC 60 13.13 1.25 7.00 10.13 9.00 Polyester 5.0 897 Up to 2.5" Add To Cart
ST-897-150C 1.5 1.5 NPSC 80 13.13 1.25 7.00 10.13 9.00 Polyester 5.0 897 Up to 2.5" Add To Cart
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Model Inlet Connection Size (in.) Outlet Connection Size (in.) Connection Type Flow (m3/hr) Dim A (mm) Dim B (mm) Dim C (mm) Dim D (mm) Dim E (mm) Holding Capacity (L) Media Micron Rating Replacement Element SelectorConnectionSizeMetric
CT-234P-301C 3 3 BSPP 510 473 70 343 330 229 Paper 2.0 234P 3" to 6"
CT-234P-401C 4 4 BSPP 883 473 70 343 330 229 Paper 2.0 234P 3" to 6"
CT-235P-301C 3 3 BSPP 510 473 70 343 330 229 Polyester 5.0 235P 3" to 6"
CT-235P-401C 4 4 BSPP 883 473 70 343 330 229 Polyester 5.0 235P 3" to 6"
CT-274P-601C 6 6 BSPP 1868 464 99 483 251 254 Paper 2.0 274P 3" to 6"
CT-275P-601C 6 6 BSPP 1868 464 99 483 251 254 Polyester 5.0 275P 3" to 6"
CT-8450-076C .75 .75 BSPP 43 215 25 127 158 140 Paper 2.0 8450
CT-8451-076C .75 .75 BSPP 43 215 25 127 158 140 Polyester 5.0 8451
CT-850-201C 2 2 BSPP 298 325 51 229 229 229 Paper 2.0 850 Up to 2.5"
CT-850-251C 2.5 2.5 BSPP 357 325 51 229 229 229 Paper 2.0 850 Up to 2.5"
CT-851-201C 2 2 BSPP 298 325 51 229 229 229 Polyester 5.0 851 Up to 2.5"
CT-851-251C 2.5 2.5 BSPP 357 325 51 229 229 229 Polyester 5.0 851 Up to 2.5"
CT-896-101C 1 1 BSPP 68 334 38 178 257 229 Paper 2.0 896 Up to 2.5"
CT-896-126C 1.25 1.25 BSPP 102 334 38 178 257 229 Paper 2.0 896 Up to 2.5"
CT-896-151C 1.5 1.5 BSPP 136 334 38 178 257 229 Paper 2.0 896 Up to 2.5"
CT-897-101C 1 1 BSPP 68 334 38 178 257 229 Polyester 5.0 897 Up to 2.5"
CT-897-126C 1.25 1.25 BSPP 102 334 38 178 257 229 Polyester 5.0 897 Up to 2.5"
CT-897-151C 1.5 1.5 BSPP 136 334 38 178 257 229 Polyester 5.0 897 Up to 2.5"
ST-234P-301C 3 3 BSPP 510 473 70 343 330 229 Paper 2.0 234P 3" to 6"
ST-234P-401C 4 4 BSPP 883 473 70 343 330 229 Paper 2.0 234P 3" to 6"
ST-235P-301C 3 3 BSPP 510 473 70 343 330 229 Polyester 5.0 235P 3" to 6"
ST-235P-401C 4 4 BSPP 883 473 70 343 330 229 Polyester 5.0 235P 3" to 6"
ST-8450-076C .75 .75 BSPP 43 213 25 127 156 132 Paper 2.0 8450
ST-8451-076C .75 .75 BSPP 43 213 25 127 156 132 Polyester 5.0 8451
ST-850/1-201C 2 2 BSPP 298 325 51 229 229 229 Paper 2.0 850/1 Up to 2.5"
ST-850/1-251C 2.5 2.5 BSPP 357 325 51 229 229 229 Paper 2.0 850/1 Up to 2.5"
ST-851/1-201C 2 2 BSPP 298 325 51 229 229 229 Polyester 5.0 851/1 Up to 2.5"
ST-851/1-251C 2.5 2.5 BSPP 357 325 51 229 229 229 Polyester 5.0 851/1 Up to 2.5"
ST-896-101C 1 1 BSPP 68 334 32 178 257 229 Paper 2.0 896 Up to 2.5"
ST-896-126C 1.25 1.25 BSPP 102 334 32 178 257 229 Paper 2.0 896 Up to 2.5"
ST-896-151C 1.5 1.5 BSPP 136 334 32 178 257 229 Paper 2.0 896 Up to 2.5"
ST-897-101C 1 1 BSPP 68 334 32 178 257 229 Polyester 5.0 897 Up to 2.5"
ST-897-126C 1.25 1.25 BSPP 102 334 32 178 257 229 Polyester 5.0 897 Up to 2.5"
ST-897-151C 1.5 1.5 BSPP 136 334 32 178 257 229 Polyester 5.0 897 Up to 2.5"
  • Overview
  • Product Documents
  • Alternative Solutions

Features

  • Easy maintenance due to see through bucket (ST Series)
  • Compact design for space restrictions; min. service area
  • Inlet above element for extended element life &
    maintenance intervals
  • Corrosive resistant cast aluminum top with machined
    connections and integrated baffle design
  • Black powder coat carbon steel drop down bucket (CT)
  • Shatter-resistant polycarbonate drop down bucket (ST)

Technical Specifications

  • Vacuum Rating: medium vacuum service*
  • Temp (continuous): min ‐15°F (‐26°C) max 220°F (104°C)
  • Filter change out differential: 15-20" H2O (37‐50 mbar) over initial Δ P
  • Polyester: 99%+ removal efficiency standard to 5 micron
  • Paper: 99%+ removal efficiency standard to 2 micron

Options

  • Vacuum gauge
  • Taps for gauge and mounting brackets
  • Swing bolts for heavy duty environments
  • Drain ports
  • Extended bucket (select CT models)
  • Various finishes (CT)
  • Various media
  • Reverse pulse configuration
  • Spool piece extender (select ST models)

Applications

  • Ash Handling
  • Cement
  • Compressor-Piston
  • Envelope Manufacturing
  • Factory Automation
  • Glass, Ceramic-Vacuum
  • Paper Processing
  • Pneumatic Conveying Systems
  • Vacuum Packaging
  • Vacuum Systems-Central
  • Waste Water Aeration
  • Woodworking
  • Intake Suction Filters
  • Remote Installations for Piston and Screw Compressors
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