Pressure Difference

It should be the same- please check if you have a cross port leak of the MCGV...

You can do this by setting the flow to 100% the channel you want and pull out the bottle filters from the liquid of the other 3 channels...Do you see air being pulled up in the other 3 channels?  If yes, then you have a cross port leak,

Also, if you take the adaptor into the active inlet valve from the isocratic pump and move it to the quaternary pump -so bypassing the MCGV (where you have 4 lines in and 1 out)  how does the pressure look?

It should be the same- please check if you have a cross port leak of the MCGV...

You can do this by setting the flow to 100% the channel you want and pull out the bottle filters from the liquid of the other 3 channels...Do you see air being pulled up in the other 3 channels?  If yes, then you have a cross port leak,

Also, if you take the adaptor into the active inlet valve from the isocratic pump and move it to the quaternary pump -so bypassing the MCGV (where you have 4 lines in and 1 out)  how does the pressure look?

Thanks Jhagel, the advice was helpful

Hi Jhagel,

Do you have any suggestion to repair cross port leak of MCGV?

Hello,

In that case, you have to exchange the entire MCGV.

Regards,

we are replacing small spring inside valve, and many MCGV are recovered 

Gr8...Nice solution with small things..