This section includes Valco stainless steel needle valves, our new combination on/off needle valves, high pressure prime/purge and on/off valves, pressure regulators, and flow controllers.

If you don't find what you're looking for here, more related products are available from Stearns Corporation.

On/off and prime/purge valves

In prime/purge valves, 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. The on/off function is self-explanatory.
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Combo valves

These needle and shut-off valves provide screwdriver-adjustable control and positive shut-off without damage to the needle. Ideal for providing hydrogen and air to an FID.
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We are also continuing to make, with some refinements, the original hex-bodied combo valves made by the Condyne division of VICI Metronics for nearly 30 years.
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Micrometering (needle) valves

Very low internal volume and precision design make these valves ideal for use as gas control valves in chromatograhic systems.
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Gas flow controllers

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.
• About flow controllers
• Model 202
    User-adjustable span, upstream-referenced
• Model 100
    Fixed span, upstream-referenced
• Model 300
    Fixed span, downstream-referenced

Combo pressure regulators

A combination regulator and shut-off valve.
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