Chell CMV Valve - Introduction

For a number of years now, Chell has been producing the precision CMV needle valve. This stainless steel valve is unique in its ability to control low flows of gases 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 and 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 Mechanism Valve was developed specifically for mass spectrometry inlet service, probably the most critical application of such a valve but is eminently suitable for many other demanding applications where long-term stability is required.

Using this Site

This site is contains all the technical information relating to the CMV needle valves. Please look under the technical and downloads tab for more information. You can then use the configurator tab to select the valve type you require which you can then go on to order on-line.

Alternatively, if you would like to speak to an application engineer first, please contact us.

  • Ultra-low flow ranges from 0-20sccm air FS @ 1bar
  • Stainless Steel construction with Perlast seals
  • Helium Mass Spec. Leak Test to 10-9mblsec-1
  • Smooth opening, 6 turns to 2sccm (for Ultra-Fine Model)
  • 1/16”, 1/8”, 1/4”, 6mm or KF10 fittings
  • Optional Turns Counting Dial
  • Non-rising stem




© Chell Ltd. 2008