Replace the Multi-Channel Gradient Valve (MCGV)

Tools required

Qty.		p/n	Description
1		0100-1710	Mounting Tool for Tubing Connections
1		8710-0899	Screwdriver Pozidrive Shaft

Parts required

Qty.		p/n	Description
1		G1311-67701	Multi channel gradient valve (MCGV)

Prerequisites

Switch off pump at the on/off switch
Open the doors
Use an optional solvent shutoff valve or lift up solvent filters inside solvent bottles for avoiding leakages

NOTE

For best performance and life time, use lower channels A and D for aqueous solvents in buffer applications.

Use the mounting tool for removing tubing connections between the degassing unit and the MCGV.
Remove the inlet weaver, see Replace the Inlet Weaver.
Remove the cover from the MCGV.
Disconnect the MCGV cable (1), unscrew the two screws (2) and remove the valve (3).
Place the new MCGV into position.

NOTE
Make sure that channel A of the MCGV is put at the bottom-right position.
Tighten the two screws (1) and connect the cable to its connector (2).
Install the MCGV cover.
Install the inlet weaver, see Replace the Inlet Weaver.
Reconnect solvent tubes for channels A-D from the MCGV to the degasser outlets.

21-Jun-2025