Replace the Multi-Channel Gradient Valve (MCGV)

NOTE

The life time of the multi-channel gradient valve can be increased by regularly flushing the valve, especially when using buffers. If using buffers, flush all channels of the valve with water to prevent precipitation of the buffer, otherwise salt crystals could drop into an unused channel and form plugs that may cause leaks of that channel. Such leaks will interfere with the general performance of the valve. When using buffers in combination with organic solvents, it is recommended to connect the aqueous solutions/buffers to one of the bottom ports (A and D) and the organic solvent to one of the upper gradient valve ports. It is best to have the organic channel directly above the buffer channel (e.g., A - buffer, B - organic solvent).