This section includes Valco stainless steel needle valves, combination on/off needle valves, high pressure prime/purge and on/off valves, pressure regulators, and flow controllers.
High pressure on/off and prime/purge valves feature quality engineering, precision machining, and extremely low internal volume (< 2 µl). In prime/purge models, mobile phase flows aroud 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.
Flow controllers provide a stable flow rate under varying pressure. An upstream-referenced controller maintains the flow rate as long as the upstream (inlet) pressure is held constant; a downstream-referenced controller maintains a constant flow under constant downstream (outlet) pressure.
- Upstream-referenced controllers
- Downstream-referenced controllers
Micrometering valves combine the ease of connection of Valco zero dead volume fittings with convenient bulkhead mounting. Ideal for use as a gas control valve in chromatographic systems.
Combo valves incorporate needle and shut-off valve functions, providing a settable flow rate with positive shut-off.
The combo pressure regulator is a combination regulator and shut-off valve. They are available with 1/16" internal, 1/8" internal, and 1/8" external fittings.
VICI regulators are machined from aluminum bar stock and then hard-anodized to provide contamination-free service. They features a stainless steel diaphragm and Viton-sealed stainless poppet.