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Zero-Internal-Volume Valve (Patented)

The "internal-volume" is the space between the diaphragm and the body. When the valve closes, this volume is trapped, often reducing the sensitivity of a test instrument. In the old design, the protruding valve seat is hard and prevents the TeflonTM diaphragm from flattening against the valve body.

In the Zero-Internal-Volume system, a special soft inert elastomer (perfluoroelastomer) is used for the valve seat. When the valve closes, the soft protrusion presses flat, eliminating the internal volume.


Features of Zero-Internal-Volume
Cross-contamination prevention
Faster flushing
Perfect ejection of air-bubbles
Reduction of sample or reagent volumes
The use of soft elastic valve seats also prevents particle induced leakage.


Influence of Internal-Volume on accurate analysis
The below links to the results of an investigation into the influence on analytical accuracy that the Zero-Internal-Volume structure had when incorporated into the concentrator (On-line direct concentrator) for a gas chromatograph.An improvement in analytical accuracy was observed.
Influence of the internal-volume upon accurate analysis

Due to the elastic properties of perfluoroelastomer a slight decrease in flow rate has been observed after long periods of energization.

Models incorporating the Zero-Internal-Volume diaphragm
- STV series (2-way valve only)
MTV series
MLV series

Comparative Data Table



Internal Volume*



87 micro liters



34 micro liters


*Passage volumes only.



January 01, 2000 06:01 AM