The Ultra-fine range of stainless steel needle valves, offered by FTI, provide the finest gas flow control over typical ranges of 0-20, 0-1000 & 0-3000 std.cm3min-1 air at 1bar differential pressure.
Designed for use in pressure or vacuum applications, they are ideal for use in gas analysers, chromatographs and mass spectrometers – in addition to any application where fine gas flow control is required.
The valve’s opening characteristics are extremely smooth, preventing bursts of gas which would disturb delicate or Ultra-High Vacuum instrumentation.
Repeatability is also extremely good and the valves are available with a fully useable Turns Counting Dial, so that flow settings may be repeated time & time again.
Construction is in Stainless Steel, with Perlast® perfluoroelastomer body seals and a Fluorosint® orifice seal, for the best corrosion resistance.
Vacuum rated valves are leak tested on a helium mass spectrometer to <1x 10-8 mblsec-1 and their shut-off achieves the same specification.
Valves are available with 1/16in single ferrule or 1/8in, 1/4in or 6mm twin ferrule compression fittings and additionally, vacuum models may be selected with NW10KF fittings.
The valve was developed specifically for mass spectrometry inlet service, probably the most critical application for such a valve but is eminently suitable for many other demanding applications where long-term stability is required.
