Pressure change during valve actuation in GC

Question

Can any one confirm that when valve actuate in GC, that time atmospheric pressure change..if yes then how to correct so that same pressure will be there after n before actuation of valve..

topsoe-lak · Answer

Hi, 
 When activating a valve for gas sampling injection in On/Off position, the sample loop is either connected or removed from being in series with the carrier gas. The carrier gas pressure will change/drop for a very short period. This is normal observations. 
 A quick GSV activation will result in almost not notable pressure drops. If using a packed column the pressure drop is more notable compared with use of capillary columns. 
 Best regards - 
 Lars

Pressure change during valve actuation in GC

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