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ASCO™ Series 055 Isolation Valves
The ASCO Series 055 are PTFE fluid isolation valves designed for use with highly aggressive liquids.
The PTFE body and diaphragm isolate the internal solenoid components from the media resulting in a virtually impervious valve. Typical applications include chromatography, solvent selection/diversion, sample preparation, and DNA sequencing.
ASCO™ Series 055 Isolation Valves


Valve Actuation
Solenoid - Direct Acting
Aggressive Liquids/Gases
Pipe / Port Size
10-32 "; 1/4-28 "
2 way - 2/2 Normally Closed; 2 way - 2/2 Normally Open; 3 way - 3/2 Universal
Less than .05 Cv; From .05-.1 Cv; 0.1 Cv to 0.5 Cv
12 DC; 24 DC
Max Differential / Max Operating Pressure
Vacuum to 150 PSIG


  • Excellent self-draining capability
  • Easy-to-flush, low-volume internal cavity
  • Compact architecture is ideal for analytical bench-top instrumentation
  • Available in 2-way normally closed, 2-way normally open, and 3-way universal versions
  • Comes with #10-32, 1/4-28, or 1/8 NPSC in-line porting for exceptional versatility
  • Meets all relevant CE directives
  • Typical applications include: Chromatography, Solvent Selection/Diversion, Sample Preparation, DNA Sequencing


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