Pump Problem with Acetonitrile

[unmgvar]

syx, the date comes from the vendors when they do conferences,
i have no idea where to find the exact data, but every year it is about the same, with the number 3-5 changing some

[syx]

thanks for all. just now the technician told me that they have inlet valve with ceramic ball. I will try it first and see if the problem could be overcame.

[abbidmajid]

Hi, how did it go with the ceramic valve?

Abbid

[syx]

Hi, how did it go with the ceramic valve?

Abbid

the problem is still exist. we can use premixed-mobile phase, but this is create problem for us during method development. we cannot change the composition of mobile phase easily, so the method development becomes expensive since we waste more solvent and time.
could anyone please give me the list of the systems that using spring loaded check valve or active inlet check valve?
thanks in advance.