Why servo-driven beats solenoid in geotechnical testing
Most automated valves use solenoid mechanisms, which generate heat, and in triaxial soil test equipment, even small temperature fluctuations can affect pore water pressure and volume-change readings. The GDS Autovalve is servo-driven instead, operating with virtually no heat output and keeping measurements accurate throughout the full test duration.
Minimised dead volume for more accurate pore pressure readings
Mounted directly on the triaxial cell, the Autovalve keeps the fluid path between valve and specimen as short as possible. The further a valve sits from the specimen in consolidation test equipment, the more fluid sits between them. That fluid compresses, resulting in lower pore water pressure readings and slower response during cyclic testing.
Direct cell mounting cuts that path to a minimum, delivering faster and more accurate pore pressure response, especially during undrained shear and dynamic loading.
Compatible triaxial and consolidation testing systems
The GDS Autovalve is compatible with the following GDS geotechnical testing equipment: GDSTAS, GDSTTS, GDSPERM, ELDYN, DYNTTS, GDSTTA, GDSCRS, and GDSHCA.
Already Own a GDS Controller? You Don't Need to Replace It
The Autovalve is compatible with V3 GDS Standard Pressure Controllers. If you're running a V2 controller, an upgrade path is available, so you can add automation without buying new hardware. V1 controllers cannot be upgraded and are not compatible with the Autovalve.
FAQ's
What equipment does the Autovalve work with?
GDSTAS, GDSTTS, GDSPERM, ELDYN, DYNTTS, GDSTTA, GDSCRS, and GDSHCA.
Why is the Autovalve servo-driven instead of solenoid?
Solenoid valves generate heat that can affect pore water pressure and volume readings. The servo-driven Autovalve produces virtually no heat, keeping measurements accurate throughout the test.
Why is the Autovalve servo-driven instead of solenoid?
Solenoid valves generate heat that can affect pore water pressure and volume readings. The servo-driven Autovalve produces virtually no heat, keeping measurements accurate throughout the test.How do I know if my Standard Pressure Controller is a V1, V2, or V3?
V1 controllers have an RS232 port. V2 controllers are marked "V2" on the base. V3 Controllers are marked with a V3 label on the barrel and “Standard Pressure Controller V3” on the base.
Is the Autovalve compatible with Advanced Pressure Controllers?
No. Advanced Pressure Controllers, including 2MPa/1000cc models, are not currently supported.
Do I need a special triaxial cell to use the Autovalve?
No. The Autovalve works with a wide range of triaxial cells, including non-GDS cells, provided the valves can be connected in line. The cell shown in our product photos is for illustration only.
Is the Autovalve compatible with V2 controllers?
An upgrade path to V3 is available for V2 controllers. Contact GDS Instruments for details.
Can a V1 controller be upgraded to work with the Autovalve?
No. V1 controllers cannot be upgraded to V3 and are not compatible with the Autovalve.