flow, pressure, and on/off control devices
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VICI AG International Sales: + 41–41–925–6200 Fax: + 41–41–925–6201
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This section includes stainless needle valves, our combination on/off
needle
valves, high pressure prime/purge and on/off valves, and VICI pressure regulators
and flow controllers.
Because cast parts can introduce porosity and contamination, every VICI control
device is assembled from components which are precision-machined from bar
stock. This assures that every item has the same high quality workmanship, with
careful assembly and testing to rigid standards.
On/Off and Prime/Purge Valves
Flow, Pressure, and On/Off
Control Devices
Valco high pressure on/off or
prime/purge valves feature quality
engineering, precision machining, and
extremely low internal volume (< 2 µl),
making them the ideal choice in the
most demanding liquid or supercritical
fluid chromatography or extraction
systems.* The on/off function is self-
explanatory; in prime/purge models,
mobile phase flows around the needle
when the valve is closed, relieving
the back pressure from the column.
When the valve opens, mobile phase
vents to waste to prime the pump.
Standard models provide leak-tight
operation up to 10,000 psi (690 bar) at
100°C, with high temperature versions
rated up to 6,000 psi/300°C. A 1/16"
fitting model with a larger bore and
a 1/8" fitting model are available for
high flow applications.
The valve needle is made from a
special high strength alloy which is
resistant even to the buffer salts which
might accidentally precipitate inside
the valve. Seals are fluorocarbon, with
valve bodies machined from HPLC
grade stainless steel, ensuring long
lifetime in even the most demanding
situations.
The on/off and prime/purge valves are
available in manual or air/CO
2
actuated
versions. The automated valves
require a single three-way solenoid:
application of 50 psi opens the valve;
venting the air allows the spring to
return the valve to the closed position.
*Not suitable for use with gases.
ultra-high
pressure valves
See our new 40,000 psi
on/off and prime/purge
valves
. . . . .
page 85
CHROMalytic TECHnology Pty Ltd AUSTRALIAN Distributors e-mail:
Tel: 03 9762 2034
