Selector Valves

VICI Valco selector valves (also called multiposition valves) differ from traditional two-position valves in that they can step through multiple positions.
Dankzij dit ontwerp kunnen laboratoria efficiënt schakelen tussen meerdere stromen of kolommen zonder handmatige tussenkomst — wat vooral handig is bij geautomatiseerde GC- of HPLC-opstellingen, meerkanaalsmonsterinname of monster-/kolomwisselingen.

Key properties:

• Available in low-pressure (for GC) and high-pressure (for HPLC) versions.
• Various flow configurations such as dead-end (SD), common outlet (SC), flow-through (SF), trapping (ST) and trapping/flow-through (STF).
• Modular construction, compatible with electric or pneumatic actuators.

SD: Dead-Ended (SD configuration)

Bij SD-selectorventielen eindigt iedere positie blind (dead-end). Er is dus geen doorstroming door niet-geselecteerde posities. Ideal for applications where only one sample line may be active and all other lines must remain fully closed, such as selective sampling in GC laboratories.

SC: Common Outlet (SC configuration)

With SC selector valves, all positions come together at one shared outlet. This configuration is used when several sources must be routed to one detector, column or analysis path. Dit is een veelgebruikte opstelling in GC/HPLC-laboratoria voor autosampling, kolomselectie of meerkanaals routing.

SF: Flow-Through (SF configuration)

In an SF valve, the medium flows continuously through the selected position, while non-selected positions remain closed. Dit minimaliseert dode ruimte en is ideaal voor laboratoria die met reactieve gassen, vluchtige monsters of snelle schakelingen werken.

ST: Trapping (ST configuration)

ST selector valves are designed to temporarily hold (trap) samples in a selected position. This is used in concentration or pre-enrichment steps, for example in trace analysis or pre-column fraction collection. The non-selected positions remain closed.

STF: Trapping Flow-Through (STF configuration)

The STF configuration combines trapping with flow-through functionality. The sample can be held and flow through in a controlled way in one integrated selector solution. Dit is ideaal voor geavanceerde laboratoriumprocessen zoals online sample-prep, multi-kolom switching en fractionering.