Micro Control Valves

Micro - control valves can be used for a wide range of applications in chromatography, as well as analytical science. Generally, micro needle valves are used for fine control of gas or liquid flows. Most valves can be used at elevated temperatures over a wide range of pressures from high vacuum to a few atmospheres.

Two basic configurations exist in the valve product range, – an "L" and a "T" configuration.

If the application requires in line, on / off control or metering of a single gas stream, choose an "L" configuration, i.e. BMCV, MCV, MOVP, MOV or SMOV.

If the application requires diversion or splitting from the main stream of gas to another column or detector and so on, choose a "T" configuration, i.e. MOVT, MOVPT or MCVT.

The flow of a gas through an orifice is affected by its viscosity. Different gases have different viscosities and so the flow through valves will vary according to the gas being used.

As the temperature of a gas is raised, the collisional frequency of the gas molecules rises and the effective viscosity of the gas increases. While the effect varies from one gas to another, the overall effect is that increasing the temperature decreases the anticipated flow through the valve.