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..
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..
Your system likely came with a valve diagram, if you can please post an image of it.
Using H.Ahmadpour's valve diagram as an example, I've boxed two areas that might be related to your posts. The green box is where sample introduction is performed and loading the sample loop in a consistent way is important. However based off your last reply, it seems like your problem is not the sample loop but actually one of the other valves, in my example below I boxed in red a restrictor for one of the valves with Col 4. The purpose of the restrictor is to balance out any pressure/flow change from when the valve actuates. Col 4 has column dimensions that cause a certain amount of restriction on the pressure/flow of the system. The idea of the restrictor on the same valve is to dial the restrictor until the restrictor is providing the same amount of restriction as Col. 4 for that valve. Then when the valve articulates there is no large change of flow/pressure for the system.
The image at the bottom of the post shows what the restrictor looks like on the GC valve box. It has a slotted head for a screwdriver to make adjustments.
